Release 4.3.0 9th Oct 2022 -------------------------- The is the first 4.3.x stable release for plane. It is a major release with a lot of changes since 4.2.3. Changes since 4.3.0beta3: - added 1M and 2M flash warning checks for for fmuv2, fmuv3 and Pixhawk1-1M firmwares - added support for multi-byte i2c reads in scripting The change list from 4.2.3 stable is very long. Here are the main changes: - fixed BRD_SAFETY_MASK for enabling outputs when safety on - fixed persistence of mapping of CAN airspeed sensors to instances - fixed precision of NMEA serial output function - added report of "Engine Running" when using ICE - fixed handling of defaults.parm files with lines over 100 chars - fixed handling of defaults.parm files with no newline on last line - fixed possible divide by zero when changing to GUIDED on quadplanes - fixes for VideoTX, fixing buffer overrun and tramp handling - fixed spurious error about sending RPM when RPM disabled - fixed an EKF3 lane switch issue that can cause incorrect height with dual GPS - fixed mission cmd to mission int initialisation error - fixed mission jump tracking init on startup - fixed OSD view roll/pitch error for tailsitters - added SkystarsH7HD-bdshot - fixed SkystarsH7HD VTX control - reduced memory usage on MatekF405-CAN board - disable SLCAN when armed to reduce CPU load - enable CAN battery mon on CUAV V6X by default - added arming check for Q_M_SPIN_MIN value too high - fixed reporting of RPM from harmonic notch - improved handling of airspeed errors and airspeed auto disable - fixed SERVO_AUTO_TRIM for multiple outputs of same type - fixed auto baud rate detection on SBF/GSOF/NOVA GPS - increased max board name length for mavlink statustext to 23 - fixed incorrect disable of notches for non-throttle notch - added notch filter slew limit to reduce notch errors - added ARMING_OPTIONS to control display of pre-arm errors - several OSD fixes for params, font and resolution - support PWM type transmission for CAN PWM output - support Currawong ECU as EFI backend - support lua scripts for EFI backends - implement SkyPower and HFE CAN EFI lua scripts - improved speed of log download with dataflash block backends - disabled all GPS drivers except uBlox and NMEA on Pixhawk1-1M to save flash - disabled all GPS drivers except uBlox on MatekF405-bdshot and omnibusf4pro-bdshot - fixed FFT indexing bug - added USART2 for AIRLink - allow reset to default airspeed using mission item DO_CHANGE_SPEED - added new boards AtomRCF405, KakuteH7Mini-Nand, SkystarsH7HD - added bi-directional dshot for several new boards - EK3_GPS_VACC_MAX threshold to control when GPS altitude is used as alt source - EKF ring buffer fix for slow sensor updates - EKF3 source set change captured in replay logs - numerous gimbal support improvements - improved RemoteId support - SecureBoot support with remote update of secure boot public keys - crash_dump.bin file saved to SD Card on startup (includes details re cause of software failures) - several new pre-arm checks (AHRS type, scripts, terrain) - numerous scripting improvements - fixed scripting restart leaking memory - Benewake H30 radar support - BMI270 IMU performance improvements - Logging pause with auxiliary switch - TeraRanger Neo rangefinder support - support for both AMSL and ellipsoid height in most GPS drivers - Custom controller support - parameter defaults sent with param FTP and onboard logs - Sim on Hardware allows simulator to run on autopilot - added Q_LAND_ALTCHG parameter - added climb before QRTL for safer QRTL from low altitudes - added support for logging pre and post filtered FFT data - support triple-notch harmonic notch filter - support up to 32 actuators (with SERVO_32_ENABLE parameter) - support EFI input over DroneCAN - by default only run notch filter on first IMU - added ESC_TLM_MAV_OFS parameter for mapping ESCs to MAVLink ESC telemetry - added Q_NAVALT_MIN for quadplane takeoff - added ICE redline governor - added in-flight FFT notch tuning option - added Sagetech ADSB support - added INS_HNTCH_FM_RAT parameter for handling under-hover throttle - improvements to filtering on ICM42xxx IMUs - added option parameters to NAV_VTOL_LAND mission item for fixed wing approach Many thanks to the huge number of developers, testers and documenters who contributed to the 4.3.0 release! Special thanks to all the ArduPilot Parters who have worked closely with us on the 4.3.x development and testing, with many partners contributing suggestions or supporting particular features. Release 4.3.0beta3 7th Oct 2022 ------------------------------- This is the third beta of the 4.3.0 stable release. Changes since beta1 are: - fixed BRD_SAFETY_MASK for enabling outputs when safety on - fixed persistence of mapping of CAN airspeed sensors to instances - fixed precision of NMEA serial output function - added report of "Engine Running" when using ICE - fixed handling of defaults.parm files with lines over 100 chars - fixed handling of defaults.parm files with no newline on last line - fixed possible divide by zero when changing to GUIDED on quadplanes Happy flying! Release 4.3.0beta2 3rd Oct 2022 ------------------------------- This is the second beta of the 4.3.0 stable release. Changes since beta1 are: - fixes for VideoTX, fixing buffer overrun and tramp handling - fixed spurious error about sending RPM when RPM disabled - fixed an EKF3 lane switch issue that can cause incorrect height with dual GPS - fixed mission cmd to mission int initialisation error - fixed mission jump tracking init on startup - fixed OSD view roll/pitch error for tailsitters - added SkystarsH7HD-bdshot - fixed SkystarsH7HD VTX control - reduced memory usage on MatekF405-CAN board - disable SLCAN when armed to reduce CPU load - enable CAN battery mon on CUAV V6X by default - added arming check for Q_M_SPIN_MIN value too high - fixed reporting of RPM from harmonic notch - improved handling of airspeed errors and airspeed auto disable - fixed SERVO_AUTO_TRIM for multiple outputs of same type - fixed auto baud rate detection on SBF/GSOF/NOVA GPS - increased max board name length for mavlink statustext to 23 - fixed incorrect disable of notches for non-throttle notch - added notch filter slew limit to reduce notch errors - added ARMING_OPTIONS to control display of pre-arm errors - several OSD fixes for params, font and resolution - support PWM type transmission for CAN PWM output - support Currawong ECU as EFI backend - support lua scripts for EFI backends - implement SkyPower and HFE CAN EFI lua scripts - improved speed of log download with dataflash block backends - disabled all GPS drivers except uBlox and NMEA on Pixhawk1-1M to save flash - disabled all GPS drivers except uBlox on MatekF405-bdshot and omnibusf4pro-bdshot - fixed FFT indexing bug - added USART2 for AIRLink - allow reset to default airspeed using mission item DO_CHANGE_SPEED Happy flying! Release 4.3.0beta1 13th Sep 2022 -------------------------------- This is the first beta of the 4.3.0 stable release. There are a lot of changes since the 4.2.3 stable release. Key changes are: - added new boards AtomRCF405, KakuteH7Mini-Nand, SkystarsH7HD - added bi-directional dshot for several new boards - EK3_GPS_VACC_MAX threshold to control when GPS altitude is used as alt source - EKF ring buffer fix for slow sensor updates - EKF3 source set change captured in replay logs - numerous gimbal support improvements - improved RemoteId support - SecureBoot support with remote update of secure boot public keys - crash_dump.bin file saved to SD Card on startup (includes details re cause of software failures) - several new pre-arm checks (AHRS type, scripts, terrain) - numerous scripting improvements - fixed scripting restart leaking memory - Benewake H30 radar support - BMI270 IMU performance improvements - Logging pause with auxiliary switch - TeraRanger Neo rangefinder support - support for both AMSL and ellipsoid height in most GPS drivers - Custom controller support - parameter defaults sent with param FTP and onboard logs - Sim on Hardware allows simulator to run on autopilot - added Q_LAND_ALTCHG parameter - added climb before QRTL for safer QRTL from low altitudes - added support for logging pre and post filtered FFT data - support triple-notch harmonic notch filter - support up to 32 actuators (with SERVO_32_ENABLE parameter) - support EFI input over DroneCAN - by default only run notch filter on first IMU - added ESC_TLM_MAV_OFS parameter for mapping ESCs to MAVLink ESC telemetry - added Q_NAVALT_MIN for quadplane takeoff - added ICE redline governor - added in-flight FFT notch tuning option - added Sagetech ADSB support - added INS_HNTCH_FM_RAT parameter for handling under-hover throttle - improvements to filtering on ICM42xxx IMUs - added option parameters to NAV_VTOL_LAND mission item for fixed wing approach Please report flight tests of the 4.3.0beta series on discuss.ardupilot.org Happy flying! Release 4.2.3 21st August 2022 ------------------------------ This is a minor stable release with a few new features and bug fixes. The changes from 4.2.0 are: - OpenDroneID improvements - added --enable-opendroneid configure option - added --enable-check-firmware configure option - enable OSD menus on KakuteH7 - added prearm checks for rangefinder pin conflicts - added diagnostics for scurve internal error - allow absolute paths for linux boards in param defaults - fixed AIRBRAKE rc option warning - fixed notch filtering ordering issue on loss of RPM source - fixed Lutan EFI update serial flood - fixed --upload to work on WSL2 - allow INA2xx battery to init after startup - fixed healthy check on battery monitors to check all enabled monitors - added Pixhawk6C and Pixhawk6X support - fixed alighment of QRTL start in fixed wing circle landing approach - added Foxeer Reaper F745 support - added MFE PixSurveyA1 support - fixed combination of waypoint passby with acceptance distance - cut throttle on ICE stop when armed - added ICE option for starting when disarmed - zero VFWD integrator on ICE override in quadplanes - don't failsafe when in fixed wing landing sequence with RTL_AUTOLAND - improved handling of overshoot in VTOL landing - improved choice of target airspeed in VTOL landing approach - improved ICM42xxx filter settings - allow for faster sample rates on ICM42xxx Release 4.2.3beta3 19th August 2022 ----------------------------------- This is a minor stable release with a few new features and bug fixes. The changes from beta1 are: - OpenDroneID improvements - added --enable-opendroneid configure option - added --enable-check-firmware configure option - reverted notch filter changes from beta3 due to issue on some aircraft - enable OSD menus on KakuteH7 - added prearm checks for rangefinder pin conflicts - added diagnostics for scurve internal error - allow absolute paths for linux boards in param defaults - fixed AIRBRAKE rc option warning Release 4.2.3beta2 10th August 2022 ----------------------------------- This is a minor stable release with a few new features and bug fixes. The changes from beta1 are: - OpenDroneID support - fixed notch filtering ordering issue on loss of RPM source - fixed Lutan EFI update serial flood - fixed --upload to work on WSL2 Release 4.2.3beta1 2nd August 2022 ---------------------------------- This is a minor stable release with a few new features and bug fixes. The changes are: - allow INA2xx battery to init after startup - fixed healthy check on battery monitors to check all enabled monitors - added Pixhawk6C and Pixhawk6X support - fixed alighment of QRTL start in fixed wing circle landing approach - added Foxeer Reaper F745 support - added MFE PixSurveyA1 support - fixed combination of waypoint passby with acceptance distance - cut throttle on ICE stop when armed - added ICE option for starting when disarmed - zero VFWD integrator on ICE override in quadplanes - don't failsafe when in fixed wing landing sequence with RTL_AUTOLAND - improved handling of overshoot in VTOL landing - improved choice of target airspeed in VTOL landing approach - improved ICM42xxx filter settings - allow for faster sample rates on ICM42xxx Release 4.2.2 24th June 2022 ---------------------------- This is a minor stable release with a few new features and bug fixes. Just one change since beta1. The changes are: - support two full harmonic notches using the INS_HNTC2_ parameters - adjust neopixel bitwidths for better reliability - fixed EKF3 replay bugs that caused poor replay fidelity - added BLHeli_S ESC type in SERVO_DSHOT_ESC - reduced min lean angle for alt-hold in quadplanes to 5 degrees - fixed param ftp run length encoding bug - reduced default quadplane rate accelerations and XY position gains - improved parameter checks of Q_M_PWM parameters for bad conversions - added Q_NAVALT_MIN parameter for min alt to start attitude control in takeoff - added CAN_Dn_UC_POOL parameter to control DroneCAN pool size, to allow memory saving on F4 boards - saved hardfault crash dumps to microSD if detected - fixed PWM rangefinder bug and support SCALING parameter - updated OSD flight modes menu for newer modes - preserve new rangefinder addresses on VL53L1X - protect against hardfault on bad CRSF frames - handle reset of CRSF receiver in flight - added MambaH743v4 and MambaF405 MK4 - fixed fault on FFT init with ARMING_REQUIRE=0 - synced quicktune lua script with latest version - learn MAVLink routes on private channels - fixed throttle compensation with FWD_BAT_VOLT_MAX at low voltages Happy flying! Release 4.2.2beta1 16th June 2022 --------------------------------- This is a minor stable release with a few new features and bug fixes. The changes are: - support two full harmonic notches using the INS_HNTC2_ parameters - adjust neopixel bitwidths for better reliability - fixed EKF3 replay bugs that caused poor replay fidelity - added BLHeli_S ESC type in SERVO_DSHOT_ESC - reduced min lean angle for alt-hold in quadplanes to 5 degrees - fixed param ftp run length encoding bug - reduced default quadplane rate accelerations and XY position gains - improved parameter checks of Q_M_PWM parameters for bad conversions - added Q_NAVALT_MIN parameter for min alt to start attitude control in takeoff - added CAN_Dn_UC_POOL parameter to control DroneCAN pool size, to allow memory saving on F4 boards - saved hardfault crash dumps to microSD if detected - fixed PWM rangefinder bug and support SCALING parameter - updated OSD flight modes menu for newer modes - preserve new rangefinder addresses on VL53L1X - protect against hardfault on bad CRSF frames - handle reset of CRSF receiver in flight - added MambaH743v4 and MambaF405 MK4 - fixed fault on FFT init with ARMING_REQUIRE=0 - synced quicktune lua script with latest version - learn MAVLink routes on private channels Happy flying! Release 4.2.1 23rd May 2022 --------------------------- This is a minor release on top of the 4.2 firmware. It has a number of bug fixes and safety improvements. The changes are: - fixed a bug in handling wrap in log download when 500 logs are on the microSD card - added FlyingMoonF407 and FlyingMoonF427 support - fixed RSSI input on the RCIN pin on CubeBlack and CubeOrange - fixed update of gyro FFT throttle tracking - removed unhealthy reporting on airspeed sensors with negative pressure as this commonly happens on VTOL takeoff - improved handling of large LOITER_TURNS mission items, expanding maximum to 2.5km - added fuel usage integration on Lutan EFI - refuse arming in AUTO when in a landing sequence due to a failsafe - account for sprung throttle (from RC_OPTIONS) in throttle suppression code - improved safety of in-flight compass learning - fixed automatic airspeed ratio calibration for 2nd airspeed sensor - increase safety of GUIDED -> AUTO takeoff sequence used by QGC - added CAN_Dx_UC_ESC_OF parameter for ESC offset for bandwidth efficiency - fixed handling of safety state on boards with no safety switch - fixed bug where a false positive could trigger landing disarm while land repositioning is active The most important fixes are related to how QGC (which is often used on modern GCS style transmitters) does automatic takeoff with the "swipe right for takeoff" system. QGC does a sequence of a change to GUIDED mode, then arming, then change to AUTO mode. That sequence is dangerous if the current waypoint is not properly reset to a VTOL takeoff. To fix this a number of changes were made to ensure that takeoff is done with a valid VTOL takeoff. The changes include handling of failsafe events (such as GCS or RC failsafe) part way through this takeoff sequence. If QRTL or RTL is engaged during this sequence then the vehicle will switch to QLAND. Happy flying! Release 4.2.1beta1 19th May 2022 -------------------------------- This is a minor release on top of the 4.2 firmware. It has a number of bug fixes and safety improvements. The changes are: - fixed a bug in handling wrap in log download when 500 logs are on the microSD card - added FlyingMoonF407 and FlyingMoonF427 support - fixed RSSI input on the RCIN pin on CubeBlack and CubeOrange - fixed update of gyro FFT throttle tracking - removed unhealthy reporting on airspeed sensors with negative pressure as this commonly happens on VTOL takeoff - improved handling of large LOITER_TURNS mission items, expanding maximum to 2.5km - added fuel usage integration on Lutan EFI - refuse arming in AUTO when in a landing sequence due to a failsafe - account for sprung throttle (from RC_OPTIONS) in throttle suppression code - improved safety of in-flight compass learning - fixed automatic airspeed ratio calibration for 2nd airspeed sensor - increase safety of GUIDED -> AUTO takeoff sequence used by QGC - added CAN_Dx_UC_ESC_OF parameter for ESC offset for bandwidth efficiency The most important fixes are related to how QGC (which is often used on modern GCS style transmitters) does automatic takeoff with the "swipe right for takeoff" system. QGC does a sequence of a change to GUIDED mode, then arming, then change to AUTO mode. That sequence is dangerous if the current waypoint is not properly reset to a VTOL takeoff. To fix this a number of changes were made to ensure that takeoff is done with a valid VTOL takeoff. The changes include handling of failsafe events (such as GCS or RC failsafe) part way through this takeoff sequence. If QRTL or RTL is engaged during this sequence then the vehicle will switch to QLAND. Happy flying! Release 4.2.0 4th May 2022 -------------------------- This is the first 4.2 stable release of plane. Since 4.2.0beta6 there have only been 3 changes: - added VTOL-quicktune lua script - fixed custom compass orientation for DroneCAN compasses - fixed a bug in blended Z accel calculation when not using first IMU Since the last stable 4.1.7 release there have been over 4k changes, so it is not practical to list them all here. Highlights for plane users include: - smoother quadplane transitions - ship landing support - CAN over mavlink support - major tailsitter improvements - much better error reporting and diagnostics - numerous lua scripting improvements - improved weathervaning support and options - support for fixed wing aerobatics - many new flight controllers added - DroneCAN dual-GPS for yaw support Happy flying! Release 4.2.0beta6 28th April 2022 ---------------------------------- This is the 6th beta of the 4.2.0 major release - fix FIFO overruns on the BMI088 IMU - fix plane avoidance behaviour when in AvoidADSB mode - disable fatal exceptions on DMA errors on STM32 - changed quadplane weathervaning to make pitch input optional for nose-in and tail-in - increased default scripting heap size on F7/H7 to 100k - added ICM42688 option on MatekH743 - added ICM4xxxx option on QiotekZealotH743 - rename INS_NOTCH parameters to INS_HNTC2 - added Q_OPTION for RTL on failsafe in Q modes, for ship operation - disabled setting of highest airspeed when disarmed - fixed init of file descriptor in logging - cope with gaps in log listing, and reduce impact of log listing on EKF and ESCs - avoided repeated message on "failed to detach from pin" for RPM - improved error messages on GPIO pin configuration conflict - use narrower bitwidths for dshot, giving more accurate timing - added MatekF765-Wing-bdshot target - fixed use of DO_SET_SERVO with SERVOn_FUNCTION=0 - several improvements to SPRacingH7 support Happy flying! Release 4.2.0beta5 5th April 2022 --------------------------------- This is the 5th beta of the 4.2.0 major release - fixed a timer bug that could cause boards using flash storage to watchdog - added OTG2 USB on QioTekZealotH743 - increased stack size on log and monitor threads - fixed rudder control when ARMING_RUDDER != 2 on quadplanes - fixed accel bias when an IMU is disabled in EKF3 - improved QSPI support for SPro H7 Extreme - fixed @SYS file logging - fixed buzzer on MatekH743, going back to 16 bit timer - fixed H7 flash storage bug that caused re-init on overflow - fixed incorrect lock class in UART driver Happy flying! Release 4.2.0beta4 28th March 2022 ---------------------------------- This is the 4th beta of the 4.2.0 major release. - added BATT_OPTIONS option to send resting voltage (corrected for internal resistance) to the ground station - fixed a bug when a blended GPS is lost, where the wrong GPS could be used for a short time - prevent rapid RTL/AUTO switching with DO_LAND_START and fence breach - added RTL_AUTOLAND=3 to prevent arming check about DO_LAND_START with no RTL_AUTOLAND - fixed yaw in AUTO mode on the ground on quadplanes when using rudder to disarm - fixed failover between IOMCU RC input and a secondary RC input on a uart - display source of RC input with protocol - fixed DShot reversal bugs with IOMCU based boards - fixed battery remaining percentage with sum battery backend - added KakuteH7-bdshot - added terrain reference adjustment and TERRAIN_OFS_MAX parameter - fixed param conversion bug (impacts airspeed enable) - changed MatekH743 to use a 32 bit timer Happy flying! Release 4.2.0beta3 18th March 2022 ---------------------------------- This is the 3rd beta of the 4.2.0 major release. This beta should be close to the final 4.2.0 release. - fixed pitch envelope constraint after AIRBRAKE - improvements to POSITION1 quadplane landing controller - added arming check for Q_ASSIST_SPEED - added warning if arming with ARMING_CHECK=0 - added arming check for DO_LAND_START with RTL_AUTOLAND=0 - improved throttle mix for quadplane autoland - added fence breach message on GCS - constrain indexing on declination tables Happy flying! Release 4.2.0beta2 10th March 2022 ---------------------------------- This is the 2nd beta of the 4.2.0 major release. This beta should be close to the final 4.2.0 release. - fixed EKF3 constrain bug - added quadplane ship landing support - added Q_LAND_ALTCHG to adjust landing detection sensitivity - fixed a bug in terrain home compensation - changed quaplane POSITION1 landing controller to use jerk and accel limiting - fixed default gain for weathervaning on quadplanes - fixed health check of airspeed sensor for dual sensors - fixed arming check on servos for GPIO outputs - disable stick mixing when RC input is unavailable - fixed stick mixing during GCS failsafe - disallow mavlink disarm while flying - adjust frequency selection for DShot - fixed logging bug for MCU voltage - added BeastH7v2 support - improvement to AC_WPNav for quadplane waypoint control - simplify RC failsafe messages sent to GCS Happy flying! Release 4.2.0beta1 2nd March 2022 --------------------------------- This is a major release with a lot of changes. We expect at least 4 weeks of beta testing and several beta updates before 4.2.0 final is released. Changes include: - EKF startup messages reduced - LORD Microstrain CX5/GX5 external AHRS support - Auto mode supports up to 100 DO_JUMP commands on high memory boards - Auto support for NAV_SCRIPT_TIME commands (Lua within Auto) - aerobatic scripting from any mode via RC switches - new boards AirLink, BeastF7v2, BeastH7v2, JHEMCU GSF405A, KakuteH7, KakuteH7Mini, MambaF405US-I2C, MatekF405-TE, ModalAI fc-v1, PixC4-Jetson, Pixhawk5X, QioTekZealotH743, RPI-Zero2W, SPRacingH7 Extreme, Swan-K1 - Parachute option to leave servo in open position (see CHUTE_OPTIONS parameter) - Parachute released arming check added - Pre-arm check of IMU heater temp - Pre-arm check of rangefinder health - Pre-arm check of throttle position skipped if PILOT_THR_BHV is "Feedback from mid stick" - ADIS16470, ADIS16507 and BMI270 IMU support - AK09918 compass support - Battery monitor supports voltage offset (see BATTx_VLT_OFFSET) - Benewake TFMiniPlus I2C address defaults correctly - Buzzer can be connected to any PWM on any board - Compass calibration (in-flight) uses GSF for better accuracy - CRSFv3 support, CSRF telemetry link reports link quality in RSSI - Cybot D1 Lidar support - DroneCan (aka UAVCAN) battery monitors support scaling (see BATTx_CURR_MULT) - DroneCan (aka UAVCAN) GPS-for-yaw support - Electronic Fuel Injection support incl Lutan EFI - FETtecOneWire resyncs if EMI causes lost bytes - IMU heater params renamed to BRD_HEAT_xxx - Landing gear enable parameter added (see LGR_ENABLE) - Lightware SF40C ver 0.9 support removed (ver 1.0 and higher still supported) - Maxbotix serial sonar driver support RNGFNDx_SCALING parameter to support for varieties of sensor - MPPT solar charge controller support - MTK GPS driver removed - Optical flow in-flight calibration - Ping200x ADSB support - Proximity sensor min and max range (see PRX_MIN, PRX_MAX) - QSPI external flash support - uLanding (aka USD1) radar provides average of last few samples - Unicore NMEA GPS support for yaw and 3D velocity - Board ID sent in AUTOPILOT_VERSION mavlink message - DO_SET_CAM_TRIG_DIST supports instantly triggering camera - DJI FPV OSD multi screen and stats support - GPIO pins configured by setting SERVOx_FUNCTION to -1 (also see SERVO_GPIO_MASK. BRD_PWM_COUNT removed) - GPIO pin support on main outputs on boards with IOMCU - GyroFlow logging (see LOG_BITMASK's "VideoStabilization" option) - Firmware version logged in VER message - SD card format via MAVLink - Serial port option to disable changes to stream rate (see SERIALx_OPTIONS) - VIBE logging units to m/s/s - BLHeli passthrough reliability improvements - Compass learning (inflight) fixed to ignore unused compasses (e.g. those with COMPASS_USE = 0) - EKF optical flow terrain alt reset fixed (large changes in rangefinder alt might never be fused) - EKF resets due to bad IMU data occur at most once per second - GPIO pin fix on CubeOrange, F4BY, mRoControlZeroF7, R9Pilot - MAVlink2 serial ports always send MAVLink2 messages (previously waited until other side sent MAVLink2) - Omnibusf4pro bi-directional dshot fix - Real-Time-Clock (RTC) oldest possible date updated to Jan-2022 Happy flying! Release 4.1.7 12th February 2022 -------------------------------- This is a minor release with some important bug fixes and a couple of new features: - avoid all opening of log files in main thread - support Benewake CAN Lidars - improved VTOL navigation shaping code - Compass custom orientation is never overwritten during calibration - EKF logging gaps fixed (some messages were occasionally being skipped) - IMU logging fix for IREG message (records IMU register changes) - SERVOx_FUNCTION protection to avoid memory overwrite if set too high - FTP parameter download fix Happy flying! Release 4.1.6 3rd January 2022 ------------------------------ This is a minor release with some important bug fixes: - disable the STLink debug pins after boot by default to prevent ESD from triggering CPU changes or a reset - support ICM-20608-D, IIM-42652 and ICM-40605 sensors - fixed missing covarience reset row in EKF3 - fixed failure to detect inverted RC input on uarts when transmitter is on at boot - fixed QAUTOTUNE to obey maximum attitude rate limits - fixed a bug in smartaudio support that increased CPU usage - added lowpass filter to speed scaling to prevent sudden surface movement on VTOL arming - fixed hang when BATT_MONITOR is set to 14 - fixed gaps in EKF3 logging of variances and timing Happy flying! Release 4.1.5 13th December 2021 -------------------------------- This is a minor release with some important bug fixes and small number of new features. - fixed switching airspeed sensors based on EKF3 affinity - added servo voltage pin on CUAV-X7 - make 2nd reduction of P gain in AUTOTUNE smaller - fixed fence count on upload from old fence protocol - fixed reset of ground steering lock for landing - reset VTOL takeoff if not armed - fixed 16 bit timer bug on MatekH743 - added FETTec onewire ESC support - set slew rate to zero while in QUATOTUNE twitch - fixed rate of notch filter to follow configured rate Happy flying! Release 4.1.4 25th November 2021 -------------------------------- This is a minor release with some important bug fixes and small number of new features. - fixed RC parachute release to only trigger on RC input channel above 1800, fixing an issue with trigger on power on - added QRTL flight mode as an RCn_OPTION - display VTOL position1 state change when landing approach and airbrake logic is disabled using Q_OPTIONS - limit Q_VFWD integrator to be below TRIM_THROTTLE to prevent very high forward throttle building up in some landing approach conditions - fixed an issue with high position1 landing approach target speed causing the nose to dip when going between VTOL approach and position1 states - allow for a wider range of Q_A_THR_MIX values to be configured, to better support landing quadplanes in high wind Happy flying! Release 4.1.3 16th November 2021 -------------------------------- This is a minor release with some bug fixes and small number of new features. - allow for scripting based quadplane motor mixers - fixed double application of rangefinder landing offset on go-around - avoid doing quadplane approach when close to landing point - suppress D gains on fixed wing control surfaces when in ground mode to prevent ground oscillation on some aircraft - added OBAL Linux board support - added CAN_Dn_UC_OPTION parameter to control conflicts in DroneCAN DNA database - fixed a bug in POSITION1 quadplane landing code that led to too sharp pullup in VTOL automatic landing - default maximum attitude rate for quadplanes to 75 degrees/second - fixed a bug in use of non-zero EK3_PRIMARY value - fixed a bug in ADSB vertical velocity reporting - fixed an overshoot in quadplane guided takeoff - allow for interruption of quadplane guided takeoff with a new target location - fixed creation of APM/LOGS directory on some boards - added RCn_OPTION switch for enabling fixed wing AUTOTUNE in any stabilized flight mode (useful for LOITER and AUTO modes) - support Durandal with alternative ICM-20602 IMU - removed a spurious EKF yaw reset message Happy flying! Release 4.1.2 17th October 2021 ------------------------------- This is minor update with a few important fixes and some new features: - added EK3_PRIMARY parameter, to allow for selection of other than the first IMU as initial EK3 lane - added ESC_TELEMETRY_1_to_4 to list of mavlink message selections - fixed burst read ftp error causing bad ftp param download - fixed H7 FIFO issue with RTSCTS flow control on UARTs - apply takeoff throttle slew limit in TAKEOFF mode and forward transition in quadplanes - reset target mission airspeed on disarm - added RC_OPTION bit to enable multi-receiver systems - don't apply fixed wing pitch limit to tailsitters when hovering - fixed turn rate coordination when inverted in fixed wing flight - fixed bug in AUTOTUNE mode that could leave gains from part way through the tune Of these fixes the only one that is not backwards compatible is the new RC_OPTION bit which needs to be set if you have multiple RC receivers on your aircraft and want to fail over to a backup receiver while in flight. You will need to set the new RC_OPTION to enable that for the 4.1.2 release and later. Happy flying! Release 4.1.1 stable 8th October 2021 ------------------------------------- This is the a minor bugfix release in the 4.1.x stable series. Changes are: - fixed IMU orientation on QiotekZealotF427 controller - fixed lua scripting bug in logging of strings - fixed an initialisation bug in the attitude controller for quadplanes - added desired values to PSC quadplane pos control logging - prevent entry into CRSF parameter mode while armed - added bootloader to build for MatekF765-SE Thanks to all the users who have been reporting back on flights with 4.1.0, and happy flying! Release 4.1.0 stable 28th September 2021 ---------------------------------------- This is the first stable release of the 4.1.x series for fixed wing. This is a major release, with a lot of changes over the 4.0.9 release. The changes since the last beta (4.1.0beta8) are: - fixed a wind speed initialiation bug that affects planes with no airspeed sensor and no compass - added support for icm42605 on MatekH743 There have in total been over 9000 patches applied since the last major release (the 4.0.9 stable release), so listing all of them is not practical, but a few of the highlights are: - USB log download speeds improved on F7 and H7 based boards - Large improvements in EKF stability and support for very long distance flights - new boards QiotekZealotF427, MatekF765-SE, MambaF405v2, KakuteF4Mini, FlywooF745, FlywooF745Nano, BeastF7 and BeastH7 - massive improvements to lua scripting, with greatly expanded API - External AHRS support (VectorNav) - support for EKF3 affinity for better sensor redundancy - big improvements to GPS moving baseline yaw support - new fixed wing PID system - major fixed wing autotune update giving much better tuning - added MAN_EXPO_* parameters for input expos in MANUAL, TRAINING and ACRO modes - added ONESHOT_MASK for oneshot output on control surfaces - dupport for bi-directional dshot on many boards - added PiccoloCAN servo support - new quadplane landing approach system, with airbraking - greatly improved tiltrotor support with much improved transition stability - new unified ESC telemetry system for CAN, DShot and serial ESC telemetry - temperature calibration for IMUs, including factory calibration support - much improved notch filtering support, including double-notch and realtime FFT based notch filtering - much faster parameter download and mission upload/down using MAVFTP - switched to new EKF3 as default state estimator with many new features The 4.1.0 includes contributions from over 240 developers and changes over 300 thousand lines of code across 2800 files. It has been a mammoth effort from the whole community to bring this new version of ArduPilot which pushes the best open flight controller to whole new levels. A big thank you to everyone who contributed, includding the developers, testers and documenters. You should all be very proud of this release! We are already starting work on 4.2.x, and will of course continue to do point releases to the 4.1.x series to keep everyone up to date with the latest fixes. Happy flying, and thanks for choosing ArduPilot! Release 4.1.0beta8 15th September 2021 -------------------------------------- This is a very small beta update, with a single patch to fix a serial flow control issue that came in beta7. Changes since beta7 are: - fixed auto-detection of serial flow control Happy flying! Release 4.1.0beta7 11th September 2021 -------------------------------------- This is a small beta update, with a few important fixes. I expect this to be the final beta and will release 4.1.0 in one week if no significant issues are found. Changes since beta6 are: - USB log download speeds improved on F765 and F777 based boards (USB buffers increased) - Serial port DMA contention heuristics improved (reduces chance of delays writing to serial devices) - Declination automatic lookup rounding fix (caused inaccurate declination in some parts of world) - DShot (bi-directional) support on Pixhawk4, CUAVv5, CUAVv5-Nano - IMU semaphore fix to avoid occasional corruption - QioTek Zealot F427 GPIO pin fix - Replay/DAL RMGH log message format fix - Rangefinder initial buffer size and baudrate fix (affected Aintein US-D1 radar) - increase CRSF frame timeout to cope with scheduling delays - fixed quadplane Z controller init calculation Please test this final beta and report on the discuss.ardupilot.org 4.1.0beta topic. Happy flying! Release 4.1.0beta6 29th August 2021 ----------------------------------- This is a small beta update, with a few important fixes. Changes are: - Flywoo F745 Goku Nano support - Scripting support for getting circle mode radius and setting rate - Scripting support for new Guided mode controls including acceleration control - ChibiOS scheduling slip workaround to avoid occasional 60ms delays found on MatekH743 - EKF2 divide-by-zero protection when using optical flow (issue only found in simulator) - External AHRS (e.g. VectorNav driver) init fix - KakuteF4Mini SBUS fix - Pixhawk4 blue and red LEDs swapped - Position control fixes to limit initial desired accel (horizontal and vertical) which could lead to an excessive climb or descent - fixed airspeed constraint by AHRS_WIND_MAX - fixed use of hw serial inversion pins on F4 boards - updates for new revisions of QioTekF427Zealot Happy flying! Release 4.1.0beta5 16th August 2021 ----------------------------------- This is a small beta update, with a few important fixes. Changes are: - Flywoo F745 supports external I2C compasses - GPS-for-yaw arming check added - GPS_DRV_OPTIONS allows forcing UBlox GPS to 115200 baud - Lua scripts can be placed in ROMFS_custom directory - Q_P_VELXY_FILT renamed to _FLTE, Q_P_VELXY_D_FILT renamed to _FLTD - CAN threading fix to resolve potential lockup when lua scripts use CAN - EKF3 GSF can be invoked multiple times with source switching (no longer limited by EK3_GSF_RST_MAX) - EKF3 IMU offset fix (vehicle's reported position was slightly incorrect if INS_POS_XYZ params set) - OSD overwrite and nullptr check fix - RCOut banner displayed at very end of startup procedure to avoid invalid output - allow for VTOL flightmodes after AHRS fallback to DCM - fixed a bug in Z accel initialisation (particularly affects tailsitters) - added LOG_BITMASK bit for logging attitude and PIDs at full loop rate Happy flying! Release 4.1.0beta4 25th July 2021 --------------------------------- This is a large beta update, with significant changes over beta3. Changes are: - major fixed wing autotune update over previous 4.1 beta releases - added MAN_EXPO_* parameters for input expos in MANUAL, TRAINING and ACRO modes - added ONESHOT_MASK for oneshot output on control surfaces - GPS-for-yaw enhancements including using position and yaw from different GPSs - Long distance flight supported (thousands of km) including double precision EKF and moving origin - major improvements to EKF3 stability - BLHeli fix that could cause failure to boot - CRSF message spamming and firmware string length fixed - Display re-enabled on 1MB boards - DShot always sends 0 when disarmed (protects against motors spin while disarmed due to misconfiguration) - DShot fix that could cause main loop jitter - DShot buzzer tone disabled during motor test to remove bad interation - MatekF405-bdshot NeoPixel LEDs re-enabled on PWM5 - Serial port performance improvements using FIFO on H7 boards Please report all test results and happy flying! Release 4.1.0beta3 5th July 2021 -------------------------------- This is a minor update over the 4.0.1beta2 release. It has a few important fixes for beta testers: - sync with copter 4.1.0beta5 - added QRTL always option in Q_RTL_MODE - added more modes to USE_REV_THRUST parameter - added QioTekZealonH743 board type - added EKF3 protections for variance collapse - added PiccoloCAN servo support - improved VTOL position control a long distance from home - fixed handling of 180 degree longitude date-line crossing - fixed logged after forced arm - fixed DShot with quadplane motor test - adjusted autotune handling of target filter - adjusted default roll/pitch PID filters Please report all test results, and happy flying! Release 4.1.0beta2 24th June 2021 --------------------------------- This is a minor update over the 4.0.1beta1 release. It has a few important fixes for beta testers: - Fixed a bug in attitude control during the airbrake phase of quadplane landing approach - skip POSITION1 stage of landing approach for tailsitters - fixed handling of corrupted filesystems on arming, where a long delay during log file creation could cause a watchdog reset - fixed build of VRUBrain-v51 board - re-enable soaring on MatekF405-Wing - fixed calculation of battery consumption on a commanded reset Please report all test results, and happy flying! Release 4.1.0beta1 14th June 2021 --------------------------------- This is a major release, with a lot of changes across almost all subsystems. Key changes include: - major updates to quadplane control algorithms, including new landing approach system, new input shaping system for all levels of VTOL control and new filtering options. - new PID system for fixed wing control, with much more flexible filtering and true rate D term support. - new fixed wing autotune system which on most aircraft produces a much better tune than the previous autotune. There have also been a lot of changes at the low level system level as well. - new DShot system, with much better timing and new features. - improved support for GPS moving baseline yaw - new unified ESC telemetry system for CAN, DShot and serial ESC telemetry, allowing for ESC RPM driven notch filters on more ESC types - EKF3 is now the default estimator, with EKF2 also available on systems with 2MByte of flash. - external AHRS support, allowing for a serial connected AHRS system (VectorNav-300 only at the moment) - sensor affinity in EKF3, allowing for more robust handling of sensor failure, especially for airspeed sensors - rate PID slew limiting to to detect and suppress oscillations - temperature calibration for IMUs, including factory calibration support - much improved notch filtering support, including double-notch and realtime FFT based notch filtering - lots of lua scripting improvements, with greatly expanded API - much faster parameter download and mission upload/down using MAVFTP Many thanks to everyone who contributed to this release. It is our biggest release yet and has benefited from fantastic feedback from our user community and partners. We hope you enjoy this release! Happy flying! Release 4.0.9, 23rd February 2021 --------------------------------- This is a minor release with just bug fixes: - added automatic backup/restore of parameters in case of FRAM corruption for F7/H7 boards with 32k FRAM parameter storage - fixed a bug in EKF2/EKF3 that could cause memory corruption if external naviagtion sources (such as vision based position and velocity data) is supplied before the EKF has initialised - fixed a problem with low accuracy data from UAVCAN GPS modules when GPS blending is enabled - fixed an arming check failure with u-blox M9 based GPS modules - added mRoControlZeroH7 support The main reason for this release is the parameter backup/restore. This has been an ongoing issue for quite some time. The symptom is an unexpected full parameter reset on boards using FRAM (also known as RAMTRON) for storage, particularly those using F7 or H7 based MCUs. The issue has most commonly been seen on the Hex CubeOrange board, but has been seen on boards from other vendors as well. The issue has been frustratingly difficult to reproduce. We did narrow down one cause last year which was a floating CS pin in the bootloader triggering corruption before ArduPilot starts. An updated bootloader reduced the occurrance of the issue a lot and we thought it was solved. Since then the problem has still happened a few times on boards that have had a bootloader update. This release avoids the issue by keeping a complete second copy of the parameters in the 2nd half of 32k FRAM devices. On boot we check the integrity of the primary parameter storage area via a simple signature check and if it has been corruptted then we restore from the backup area. We also raise an internal error named "params_restored". You will then need to reboot to clear the error, but your parameters will have been automatically recovered, avoiding the need to reload parameters and re-calibrate. If you get this internal error then it would be appreciated if you could send us the contents of your APM/STRG_BAK directory on the microSD card so we can analyse the corruption that happened and ensure that the fix covers all real cases. Happy flying! Release 4.0.8, 26th January 2021 -------------------------------- This is a minor release with just bug fixes: - fixed a bug where an unhealthy airspeed sensor could be fused in EKF2/EKF3 - fixed FPort RSSI scaling - fixed timestamp on RAW_IMU data to be 64 bit - fixed an issue with BLHeli pass-thru on some ESCs Happy flying! Release 4.0.7, 3rd November 2020 -------------------------------- This is a minor release over 4.0.6. The changes are: - enable telem3 on Durandal - fixed SBUS output when scanning for FPort on IOMCU - Fixed F32Lightening board IMU fast sampling issue - fixed issue with EKF2 and EKF3 with use of high accuracy GPS modules. This is important for anyone flying with a RTK GPS - Fixed KakuteF7 DShot glitch issue - Fixes issue with checking for valid RC input in ICE disable channel - fixed an interrupt flood issue with any sensor that uses interrupt timing measurement, such as RPM sensors. - Modified RM3100 driver to problem all 4 possible I2C addresses - Fixed UDP RC input on Linux boards to accept up to 16 RC inputs on UDP The most critical fix in the above list is the ISR flood issue. ISR Flood Issue --------------- The ISR flood issue happens when a misbehaving external sensor (such as an RPM sensor for a petrol motor) starts providing pulses faster than the flight controller can process them. If this happens then the CPU can be overloaded in the interrupt handling for the sensor and stop flying the vehicle. The level of interrupt rate needed to cause this issue is around 500k interrupts per second, so to be safe we have added a limit of 100k interrupts per second. If a single interrupt source produces more than 10k interrupts in a single 0.1 second period then we disable that interrupt source, print a warning to the user and raise an internal error. Happy flying! Release 4.0.6, 7th September 2020 --------------------------------- The ArduPilot development team is proud to announce the release of plane 4.0.6 stable. This is a significant release with a lot of changes, so please read the change summary below carefully. - changed LED scripting API to allow more than 32 LEDs on a pin - added support for ProfiLED LEDs - added u-blox GPS moving baseline u-blox auto-configuration - fixed handling of GPS antenna positions on EKF GPS switch - changed default USB IDs to new ArduPilot specific IDs - fixed bug in handling trim for RC control of camera mounts - added LGR_OPTIONS bits to control landing gear behaviour on takeoff/landing - improved mavlink streaming output control to better allocate time to each channel - fixed send of mavlink PARAM_VALUE on set of a readonly parameter - fixed mag variance reporting in EKF_STATUS_REPORT mavlink message - fixed time wrap bug in BMP085 barometer driver - fixed buffer overflow in ST24 RC input driver - fixed EKF usage of WMM tables when user has specified a specific declination - fixed bug in AP_Terrain on-disk format - added script for offline generation of terrain data - severel improvements to smbus battery drivers - fixed a race condition in parameter storage on ChibiOS - fixed use of zero GNSS timestamp in UAVCAN GPS driver - improved GCS messages during bootloader flash - fixed CS pin in bootloader that could corrupt FRAM on some boards - added GPS yaw to MAVLink GPS_RAW_INT message - added Hott telemetry support - added FRSky FPort support - fixed bug in CAN clock and queue handling on H7 based boards - added support for BRD_ALT_CONFIG for alternative hardware configs on several boards - added new boards CUAV-Nora, CUAV-X7, MatekH743, R9Pilot, mRoNexus - improved reporting of internal errors to GCS - fixed recursion bug in tonealarm player - fixed flaperon SERVO_AUTO_TRIM behaviour - added option to compensate forward throttle for battery voltage - added compensation in VTOL gains for pressure altitude - switched to new more flexible compass ordering system - fixed forcing of safety off on IOMCU reset - increased maximum compass scale factor to 1.4 - added RTL_CLIMB_MIN parameter for initial climb in RTL - fixed disable of throttle nudge during a RC failsafe - added support for a wider range of DLVR airspeed sensors - fixed RC input processing for out of range RC channels - added THR_FAILSAFE=2 option for flying BVLOS with only GCS failsafes enabled - fixed reordering of compasses on boot based on compass priorities - fixed use of minimum accuracy for GPS data in EKF2 and EKF3, fixing an issue with RTK GPS modules that report overly optimistic accuracy values - fixed handling of RC_OPTION bit for disabling receiver failsafe handling - fixed LOITER_TO_ALT with terrain altitude target - fixed an issue with swapping UAVCAN compasses and calibration - fixed use of VTOL quadplane missions (where the plane flies as a multi-rotor for auto waypoints) - fixed legacy parsing of some lightware i2c lidars when beyond max range - fixed RTL_AUTOLAND with MIS_RESTART=1 - enable more compasses on low flash boards - HAL erase storage fix for flash storage boards - prevent jump to circle mode in TAKEOFF if flying for less than 10s - fixed handling of out of range on LightwareI2C Lidar - fixed init of HoTT telemetry - added support for mRo Pixracer Pro, Holybro Pix32v5 - added arming check for terrain data healthy if needed - increased monitor thread size to 768 - fixed IMU fast sampling on F35Lightning board The key changes to existing behaviour to watch out for in this update are: USB IDs ------- ArduPilot has now switched to it's own USB IDs for all boards. For most users this won't cause any change, except they may notice the drop down list of devices in MissionPlanner will have the ArduPilot flight controllers labelled more usefully as "ArduPilot" instead of just "STM32". If you hit issues on windows please try reinstalling the device drivers from this URL: https://firmware.ardupilot.org/Tools/MissionPlanner/driver.msi Terrain ------- A bug fix in the format ArduPilot uses to store terrain data means that your flight controller will need to re-download the terrain data onto the sdcard via your GCS. If you fly without a GCS and you use terrain data then please re-download the terrain data you need by setting up a mission when you have internet access and allowing your flight controller to request terrain data from your GCS. Pressure Altitude Compensation ------------------------------ This release adds in the missing hook for the VTOL motor controller on a quadplane to compensate the VTOL gains using your pressure altitude. For most people this will not have a noticible effect, but some users that have tuned their aircraft for high locations may notice a tuning change. Compass Ordering ---------------- The new compass ordering system in this release gives a lot more flexibility and should preseve existing configurations and calibrations. If you hit issues then please have a look at the new compass ordering user interface in recent beta releases of MissionPlanner. THR_FAILSAFE=2 -------------- For people flying before visual range (with appropriate authorisations) there is a new option which allows for safer operation. By setting THR_FAILSAFE=2 you can setup the R/C failsafe so that R/C input will stop being used when one of the receiver failsafe conditions is met, while not triggering any failsafe actions. This is a significant improvement over setting THR_FAILSAFE=0 as it prevents the receiver inputs being used for stick mixing and other inputs that would be inappropriate when in receiver failsafe. Many thanks to everyone who contributed to and tested this release! Happy flying! Release 4.0.6beta5, 25th August 2020 ------------------------------------ This should be the final beta for 4.0.6. Several important fixes are included: - fixed disable of throttle nudge during a RC failsafe - added support for a wider range of DLVR airspeed sensors - fixed RC input processing for out of range RC channels - added THR_FAILSAFE=2 option for flying BVLOS with only GCS failsafes enabled - fixed reordering of compasses on boot based on compass priorities - fixed use of minimum accuracy for GPS data in EKF2 and EKF3, fixing an issue with RTK GPS modules that report overly optimistic accuracy values - fixed handling of RC_OPTION bit for disabling receiver failsafe handling - fixed LOITER_TO_ALT with terrain altitude target Happy flying! Release 4.0.6beta4, 27th July 2020 ---------------------------------- This is a minor change over beta3 - fixed an issue with swapping UAVCAN compasses and calibration - fixed use of VTOL quadplane missions (where the plane flies as a multi-rotor for auto waypoints) - fixed legacy parsing of some lightware i2c lidars when beyond max range Happy flying! Release 4.0.6beta3, 7th July 2020 ---------------------------------- This is a minor change over beta2 - fixed RTL_AUTOLAND with MIS_RESTART=1 - enable more compasses on low flash boards - HAL erase storage fix for flash storage boards Happy flying! Release 4.0.6beta2, 23rd June 2020 ---------------------------------- This is a minor change over beta1 - prevent jump to circle mode in TAKEOFF if flying for less than 10s - fixed handling of out of range on LightwareI2C Lidar - fixed init of HoTT telemetry - added support for mRo Pixracer Pro, Holybro Pix32v5 - added arming check for terrain data healthy if needed - fixed compass ordering bug - increased monitor thread size to 768 Happy flying! Release 4.0.6beta1, 23rd May 2020 --------------------------------- This is a major release with a significant number of new features and bug fixes. You should read the list of changes and the information below carefully. - changed LED scripting API to allow more than 32 LEDs on a pin - added support for ProfiLED LEDs - added u-blox GPS moving baseline u-blox auto-configuration - fixed handling of GPS antenna positions on EKF GPS switch - changed default USB IDs to new ArduPilot specific IDs - fixed bug in handling trim for RC control of camera mounts - added LGR_OPTIONS bits to control landing gear behaviour on takeoff/landing - improved mavlink streaming output control to better allocate time to each channel - fixed send of mavlink PARAM_VALUE on set of a readonly parameter - fixed mag variance reporting in EKF_STATUS_REPORT mavlink message - fixed time wrap bug in BMP085 barometer driver - fixed buffer overflow in ST24 RC input driver - fixed EKF usage of WMM tables when user has specified a specific declination - fixed bug in AP_Terrain on-disk format - added script for offline generation of terrain data - severel improvements to smbus battery drivers - fixed a race condition in parameter storage on ChibiOS - fixed use of zero GNSS timestamp in UAVCAN GPS driver - improved GCS messages during bootloader flash - fixed CS pin in bootloader that could corrupt FRAM on some boards - added GPS yaw to MAVLink GPS_RAW_INT message - added Hott telemetry support - added FRSky FPort support - fixed bug in CAN clock and queue handling on H7 based boards - added support for BRD_ALT_CONFIG for alternative hardware configs on several boards - added new boards CUAV-Nora, CUAV-X7, MatekH743, R9Pilot, mRoNexus - improved reporting of internal errors to GCS - fixed recursion bug in tonealarm player - fixed flaperon SERVO_AUTO_TRIM behaviour - added option to compensate forward throttle for battery voltage - added compensation in VTOL gains for pressure altitude - switched to new more flexible compass ordering system - fixed forcing of safety off on IOMCU reset - increased maximum compass scale factor to 1.4 - added RTL_CLIMB_MIN parameter for initial climb in RTL The key changes to existing behaviour to watch out for in this update are: USB IDs ------- ArduPilot has now switched to it's own USB IDs for all boards. For most users this won't cause any change, except they may notice the drop down list of devices in MissionPlanner will have the ArduPilot flight controllers labelled more usefully as "ArduPilot" instead of just "STM32". If you hit issues on windows please try reinstalling the device drivers from this URL: https://firmware.ardupilot.org/Tools/MissionPlanner/driver.msi Terrain ------- A bug fix in the format ArduPilot uses to store terrain data means that your flight controller will need to re-download the terrain data onto the sdcard via your GCS. If you fly without a GCS and you use terrain data then please re-download the terrain data you need by setting up a mission when you have internet access and allowing your flight controller to request terrain data from your GCS. Pressure Altitude Compensation ------------------------------ This release adds in the missing hook for the VTOL motor controller on a quadplane to compensate the VTOL gains using your pressure altitude. For most people this will not have a noticible effect, but some users that have tuned their aircraft for high locations may notice a tuning change. Compass Ordering ---------------- The new compass ordering system in this release gives a lot more flexibility and should preseve existing configurations and calibrations. If you hit issues then please have a look at the new compass ordering user interface in recent beta releases of MissionPlanner. Many thanks to everyone who contributed to and tested this release! Happy flying! Release 4.0.5, 4th March 2020 ----------------------------- This release includes a one important bug fix and some minor enhancements. The changes are: - fixed bug handling change of RC input source while MAVLink signing is active. This could cause a stack overflow and a crash - added display of RC output types to aid in debugging DShot outputs - modified clocking on H7 boards to produce more accurate clocks for DShot - switched to new USB VIDs for dual-CDC boards - fixed a bug in handling LOITER_TURNS for quadplanes when Q_GUIDED_MODE is enabled - added a TECS reset at the end of a VTOL takeoff to handle aircraft with TECS climb rates below VTOL climb rates Happy flying! Release 4.0.4, 16th February 2020 --------------------------------- This release includes a significant number of changes from 4.0.3. Key changes are: - re-sync the 4.0 release with Copter-4.0, bringing them in line so as to maximise cross-vehicle testing - fixed a timing issue in IOMCU that could lead to loss of RC input frames and increased latency of output to ESCs on the IOMCU - fixed a bug in restoring gains in QAUTOTUNE that could cause the aircraft to be unstable on leaving QAUTOTUNE mode - fixed stack size of ftp thread The Copter-4.0 re-sync brings in quite a few structural changes. The main user visible changes are: - UAVCAN DNA server no longer needs a microSD card to operate - added logging of UAVCAN servos and ESC feedback messages - reduced QTUN logging rate to 25Hz - reduced memory usage in EKF with multiple lanes - Minor OSD improvements - added a lot more scripting bindings - fixed UAVCAN GPS status when not connected - added EK3_MAG_EF_LIM limit for earth frame mag errors - added MAVLink FTP support - added support for WS2812 LEDs Due to the significant number of changes with the re-sync I would particularly appreciate as much flight testing as we can get on this release. Happy flying! Release 4.0.3, 21st January 2020 -------------------------------- This is a minor release with a few bug fixes and enhancements. The changes since beta1 are: - fixed 3 missing semaphore waits - fixed checking for bouncebuffer allocation on microSD card IO - fixed incorrect param count - prevent failsafe action from overriding a VTOL land - fixed compass calibration failures with auto-rotation detection - fixed errors on STM32H7 I2C (affects CubeOrange and Durandal) - fixed a race condition in FrSky passthrough telemetry - fixed DSM/Spektrum parsing for 22ms protocols - added fixed yaw compass calibration method - re-generated magnetic field tables - ensure SERIAL0_PROTOCOL is mavlink on boot The most important fix is for FrSky pass-through telemetry. Pass through telemetry support had a race condition which could lead to the flight controller generating a fault and rebooting. Until you are running a firmware with the fix you should disable FrSky pass-through telemetry by changing SERIALn_PROTOCOL from 10 to 0 on the where you have SPort enabled. Happy flying! Release 4.0.2, 30th December 2019 --------------------------------- This is a minor release with a few bug fixes and enhancements. Changes are: - fixed voltage scaling on CUAVv5Nano - fixed 10Hz NMEA output - fixed range check on RC channel selection - scale UART RX size with baudrate - default fast sampling enabled on first IMU for all capable boards - fixed bootloader flash alignment bug - fixed PWM 5 and 6 for MatekF765-Wing - support RM3100 compass on I2C - fixed error on AHRS level trim in preflight calibration - fixed handling of SB without BUSY on I2Cv1 devices - update bootloaders to be more robust to unexpected data - added new COMPASS_SCALE parameters and estimator to fix issue with compass in Here2 GPS - fixed issue with millis wrap on boards with 16 bit system timer (MatekF405, MatekF765, speedybeef4 and KakuteF4) - fixed i2c internal masks for several boards - fixed scaling of Blheli32 RPM conversion - changed to WFQ FrSky telemetry scheduler - enable LED pin on MatekF765 - added params for Durandal battery monitor pins to param docs - updated bootloaders to reduce change of line noise stopping boot - fixed DMA error causing memory corruption in ChibiOS I2C driver - fixed param conversion from plane 3.9.x to plane 4.0.x for rangefinders - cope with UAVCAN GPS that doesn't provide AUX messages (Here2 GPS) - send temperatures for IMUs on mavlink - fixed I2C clock speed error on STM32H7 - fixed CR/LF output error for NMEA output Happy flying! Release 4.0.1, 22nd November 2019 --------------------------------- This is a minor release with a few bug fixes and enhancements. Changes are: - Added Q_ASSIST_ALT parameter which offers a way for VTOL assistance at low altitudes - fixed channels 5 and 6 on the MatekF765-Wing - fixed a bug with sending data on a full UART in mavlink parameter download - fixed use of UAVCAN primary GPS with UART secondary GPS - fixed failover between rangefinders of same orientation - added RC option for TAKEOFF mode - fixed logging of current on secondary battery monitors - fixed register checking on DPS280 for mRoControlZeroF7 - added clock panel to OSD - fixed B/E led brightness on Pixhawk4 - support RTCM injection to UAVCAN GPS for RTK support - fixed an RC failsafe bug that could cause the geofence to disable - fixed a bug in the SDP33 airspeed driver Happy flying! Release 4.0.1beta1, 17th November 2019 -------------------------------------- This is a minor release with a few bug fixes and enhancements for the 4.0 stable version. Changes are: - Added Q_ASSIST_ALT parameter which offers a way for VTOL assistance at low altitudes - fixed channels 5 and 6 on the MatekF765-Wing - fixed a bug with sending data on a full UART in mavlink parameter download - added TECS_LAND_PMIN for constraining pitch minimum during landing - fixed use of UAVCAN primary GPS with UART secondary GPS - fixed failover between rangefinders of same orientation - added RC option for TAKEOFF mode - fixed logging of current on secondary battery monitors - fixed register checking on DPS280 for mRoControlZeroF7 - added clock panel to OSD - fixed B/E led brightness on Pixhawk4 - support RTCM injection to UAVCAN GPS for RTK support Happy flying! Release 4.0.0, 28th October 2019 -------------------------------- The final release of stable 4.0.0 has just one change from beta4, which is to fix a bug in the new TAKEOFF flight mode. Many thanks to everyone who has been testing the 4.0 release, and special thanks to Henry for his fantastic work in bringing the wiki up to date for this release! Happy flying! Release 4.0.0beta4, 19th October 2019 ------------------------------------ A small set of improvements over beta3: - fixed time race in airspeed driver (thanks to liang) - fixed uninitialsed bytes in send_named_float() - added TAKEOFF flight mode Happy flying! Release 4.0.0beta3, 7th October 2019 ------------------------------------ A small set of improvements over beta2: - added Pixhawk1-1M build (for Pixhawk1 with 1M flash bug) - fixed a bug handling UART corruption for u-blox driver - fixed a CAN ISR latency bug for STM32H7 boards - fixed FMU channel mask to correctly obey SERVO_RATE - fixed use of DMA on Pixracer WiFi UART - reduced flash size and memory usage with EKF optimisation changes - fixed a BLHeli bug when no motors enabled - raise default LOG_FILE_BUFSIZE on boards with more memory - fixed units of custom AHRS orientations - fixed LOG_FILE_DSRMROT with delayed log stop on disarm - fixed block flash logging - fixed SLCAN bug on Pixhawk1 and fmuv2 - added check for airspeed and Z controller active for hover throttle learning - enable hover learning by default in quadplanes Happy flying! Release 4.0.0beta2, 24th September 2019 --------------------------------------- A small set of improvements over beta1: - Added autoranging to current and voltage in OSD - fixed issue with motors spinning up in quadplane landing when below min lidar range - fixed empty pre-arm warning string in EKF - added code to cope with SCHED_LOOP_RATE being above max achievable rate - fixed delay on oneshot125 channels which was limiting loop rate - fixed use of uninitialised variable in mag fusion in EKF3 Happy flying! Release 4.0.0beta1, 16th September 2019 --------------------------------------- The 4.0.0 release of ArduPilot plane is a major release. It contains thousands of changes, some large and some small, developed over the last year. Key changes include: - support STM32H7 MCUs (Durandal and CubeOrange currently) - QAUTOTUNE mode - in-flight compass calibration - support for dynamic node allocation server in UAVCAN - support for SLCAN pass-through - support for up to 10 battery backends - support for MAVLink message intervals - initial support for onboard Lua scripting - automatic remount of microSD cards - support for additional RC input on any UART - support for WS2812 LEDs - new simulators: Morse, Webots, SilentWings, Scrimmage - added AFS_MAX_RANGE for limiting vehicle range - added support for @READONLY in embedded parameter lists - added SERIALn_OPTIONS for inversion, half-duplex and swap - added support for reversible blheli32 ESCs - added GPS timing jitter correction - added Sum battery backend type - added fuel flow battery battery types - support landing gear control based on altitude - added loiter-to-alt approach for quadplane landing - added REVERSE_THROTTLE RCn_OPTION - added crow brakes for differential spoilers - support newer versions of JSBSim in SITL - added RObotis servo support - added UAVCAN servo support - added failure timer for quadplane forward transitions - added KDECAN and ToshibaCAN support - added RM3100 compass support - support new Invensense IMUs - many small improvements to tailsitter support - added QACRO mode - improved watchdog logging - improved EKF compass handling based on WMM data - added AP_Perip CAN peripheral firmware system - added IBUS R/C input support - support yaw from GPS - support DLVR I2C airspeed sensors - fixed FrSky telem packet loss - fixed SUMD for 16 channels via pulse input - support UAVCAN buzzers, safety switch, safety LED and airspeed - added NTF_BUZZ_VOLUME parameter There are hundreds of other changes as well. I expect the beta period for this release to be quite long, and I would greatly appreciate as many test reports as possible. Please submit test results both for successful and unsuccessful tests! Happy flying! Release 3.9.11, 15th September 2019 ----------------------------------- This release fixes two bugs: - fixed an uninitialised byte in UAVCAN compass device IDs that caused users to need to re-calibrate UAVCAN compasses - fixed an I2C interrupt storm that could potentially cause a crash. This crash has never been shown to happen in our stable releases, but is being fixed as a preventative measure Release 3.9.10, 26th August 2019 ------------------------------------- This releases includes an important fix to IOMCU handling that fixes a problem where motors attached on the AUX channels can stop momentarily due to an error in the UART handling to the IOMCU. Release 3.9.9, 4th August 2019 ------------------------------ New plane stable release with two fixes over beta4: - fixed setting file timestamps with u-blox F9 GPS (thanks to Martin Sollie) - fixed return value of LightWare serial rangefinder driver when out of range Release 3.9.9beta4, 31st July 2019 ---------------------------------- Minor update over beta3: - fixed an issue with handling baro failure on CubeBlack - forced INS_USE3=1 on CubeBlack when first two IMUs are enabled Release 3.9.9beta3, 28th July 2019 ---------------------------------- Minor update over beta2: - fixed issue with setting of EKF origin in GPS modes - added support for MS4525 on 4th I2C bus - added delay on LW20 I2C probe Release 3.9.9beta2, 11th July 2019 ---------------------------------- Minor update over beta1: - added mRoControlZeroF7 support - enabled IO pass-thru on FMU failure on ChibiOS builds Release 3.9.9beta1, 8th July 2019 --------------------------------- This is a minor release with some important safety and flight improvement fixes. Key changes are: - learn EKF biases even for inactive IMUs, making IMU failover much more robust - EKF uses earth magnetic field model to reduce in-flight compass errors - EKF switches to first healthy IMU when disarmed - IMU fix for dropped samples during high CPU usage - added support for Ublox F9 GPS - switched to ChibiOS I/O firmware for ChibiOS builds to support Spektrum bind - CUAVv5 Nano LED fix - fixed watchdog trigger on simple accelcal - fixed drift of AMSL estimate when disarmed - fixed rate integrator buildup when rate control disabled Happy flying! Release 3.9.8, 26th April 2019 ------------------------------ This is a minor release with some important safety fixes. The fixes relate to two issues: - implement hardware support to reset the CPU if a software or hardware failure causes the main loop to stop running - fixed a bug in the handling of a failure of the primary IMU in a multi-IMU system The first fix relates to a flyaway that happened on a RadioLink mini-pix flight controller. The mini-pix suffered a major hardware failure that led to the main loop stopping. As the mini-pix does not have an IO co-processor this resulted in fixed control surface outputs and fixed motor output, which led to a flyaway. The plane was found, but we want to ensure that if this ever happens again that the motor will stop and that the pilot will regain control of the aircraft. The fix is to enable an option in the STM32 processor called "Independent Watchdog" (IWDG). The IWDG provides a mechanism to automatically reset the CPU on software or hardware failure resulting in the main loop stopping. When this happens the hardware also provides a mechanism for ArduPilot to know that it is booting after a watchdog reset, in which case it does the following: - if the ChibiOS bootloader has been updated then it skips the normal 5 second delay in the bootloader - it skips baromoter, gyro and airspeed calibration, allowing for very fast boot - the home position and attitude estimate of the vehicle is restored to a point less than 0.3 seconds before the lockup - the pilot regains full control, and if the pilot requests arming then arming checks are automatically bypassed We have tested this on an aircraft with a deliberately induced full CPU lockup. The aircraft recovered and flew normally within 3 seconds of lockup, with the pilot having full control. This was with a board with no IOMCU. A board that does have an IOMCU (such as a Hex cube) would have had full manual control on FMU lockup without the changes in this new release. For those boards with IOMCU the advantage of the new release is that the pilot will regain the ability to use stabilised and auto modes (including RTL) after a full CPU lockup. The additional protections of the IWDG support only apply to the ChibiOS builds. The IWDG is not supported in NuttX builds. The second key fix in this release relates to IMU failure on multi-IMU systems. If the IMU that is associated with the currently active EKF lane failed then the fixed wing attitude controller would lose attitude control and the aircraft will crash unless the pilot takes manual control. This has been fixed to ensure that IMU failover operates correctly. Other changes in this release: - added support for the CUAVv5Nano board - added retries to flash storage of parameters - fixed pullups on some fmuv3 based boards that lack hardware pullups on sdcard data lines - fixed fallback to microSD for parameter storage if a board with FRAM storage has a failed FRAM device - added a specific check for hw failure regarding the recent CubeBlack safety bulletin - fixed the power flags for brick2 on fmuv5 Happy flying! Release 3.9.7, 1st April 2019 ----------------------------- This is a minor release to fix a single important bug in speed/height handling. The bug was in the TECS (total energy control system) and could cause a sustained pitch down due to a transient glitch in airspeed demand resulting in a large negative pitch integrator. The log that found the bug was of a quadplane in CRUISE mode, and resulted in the aircraft forcing nose down for long enough to crash. The fix includes both protections for the pitch integrator and a fix for the cause of the transient in airspeed demand affecting the TECS demanded airspeed. Happy flying! Release 3.9.6, 4th March 2019 ----------------------------- This is a minor release with some important fixes for VTOL landings and EKF handling of compass switching. - fixed throttle slew on dual-motor planes - handle VTOL landings with incorrect height (or failed rangefinder) - fixed EKF alt datum reset on barometer reset - probe all I2C buses for rangefinders (fixes I2C lidar on boards with more than 2 I2C buses) - fixed lightware serial detection for newer lidars such as LW20 - fixed motor relax code on VTOL landing to prevent motors powering up after touchdown - fixed forward motor in quadplane landing transition to allow motors when landing at a height lower than takeoff height - fixed throttle mix handling for VTOL planes on descent - use WP altitude for height of ground in VTOL landing, allowing for good landings at heights well above or below takeoff height - fixed EKF compass switching with 3 compasses - fixed mini-pix UART order to match case markings - added generated git hash to apj file - fixed apj generation to not change based on time of build - fixed thread creation to use any heap, fixing a bug on MatekF405-Wing with a compass Happy flying! Release 3.9.5, 27th January 2019 -------------------------------- This is a minor update over the 3.9.4 release. This release includes the following changes: - fixed orientation of 2nd IMU for OmnibusF7V2 - fixed LEDs on Pixhawk4 and Pixhawk4-mini - fixed safety switch on Pixhawk4-mini - improved robustness of microSD support under ChibiOS - support insert of a microSD after boot but before logging starts under ChibiOS - added BRD_SD_SLOWDOWN parameter to allow microSD cards to be run at a lower clock to improve reliability - fixed VTOL takeoff in quadplanes to ignore latitude/longitude in the mission item and always takeoff vertically - added CubePurple (also known as PH2Slim) builds - added DrotekP3Pro builds - RC protocol decoding for SRXL, SUMD and ST24 extended to all boards including pixracer and ChibiOS-only boards - fixed CAN on Pixhawk4 - fixed EKF yaw reset in quadplanes - fixed bug handling corruption of DSM RC protocols - fixed internal amber LED on CubeBlack Happy flying! Release 3.9.4, 10th December 2018 --------------------------------- This is a minor update over the 3.9.3 release. Changes are: - fixed a critical bug in SBUS handling on the Pixhawk4 - fixed bugs in benewake rangefinder driver - added support for garmin LidarLite-V3HP - improved error handling for TeraRanger Lidar - fixed a bug in DSM handling for more than 7 channels on some boards - fixed default voltage and current scaling for Pixhawk4 and PH4-mini Happy flying! Release 3.9.3, 10th November 2018 --------------------------------- The ArduPilot development team are delighted to announce the 3.9.3 stable release of the ArduPilot plane code. This release includes a number of small but important fixes over 3.9.2: - fixed error handling for corrupt RC input that could lead to a crash in unusual circumstances - fixed a race condition in IOMCU event startup that could lead to the safety not being disabled on boot with BRD_SAFETYENABLE=0 - ensure surface speed scaling covers full range of configured airspeeds - added builds for new boards F35Lightning, omnibusf4v6, mRoX21-777 - updated GPIO numbers on AUX pins on all boards to be consistent with docs - updated KakuteF7 UARTs and buzzer - added ESC sensor uart on OmnibusNanoV6 - fix for Benewake rangefinder at long ranges - prevent attempts to erase dataflash logs while armed Many thanks to the people who tested this release! Happy flying! Release 3.9.3beta1, 6th November 2018 ------------------------------------- This is the first beta release for the 3.9.3 firmware. This release has the following changes over 3.9.2: - fixed error handling for corrupt RC input that could lead to a crash in unusual circumstances - fixed a race condition in IOMCU event startup that could lead to the safety not being disabled on boot with BRD_SAFETYENABLE=0 - ensure surface speed scaling covers full range of configured airspeeds - added builds for new boards F35Lightning, omnibusf4v6, mRoX21-777 - updated GPIO numbers on AUX pins on all boards to be consistent with docs - updated KakuteF7 UARTs and buzzer - added ESC sensor uart on OmnibusNanoV6 Happy flying! Release 3.9.2, 10th October 2018 -------------------------------- The ArduPilot development team are delighted to announce the 3.9.2 stable release of the ArduPilot plane code. This release includes a number of small but important fixes over 3.9.1. The changes since the 3.9.2beta3 release are: - fixed a DShot send bug that could lead to board lockup - fixed RGB LED display on Pixracer under both NuttX and ChibiOS - fixed safety switch option handling bug Thanks for the bug reports and testing by all users for the 3.9.2beta series! Happy flying! >>>>>>> a9d5581378... Plane: updated release notes for 3.9.8-beta1 Release 3.9.2beta3, 20th September 2018 --------------------------------------- The is the third beta release of the plane 3.9.2 stable release. It contains a small number of fixes: - fixed clearing of loiter pilot acceleration targets for quadplanes - fixed handling of duplicate rotations for COMPASS_AUTO_ROT I expect this will be the last beta release before 3.9.2 Happy flying! Release 3.9.2beta2, 15th September 2018 --------------------------------------- The is the second beta release of the plane 3.9.2 stable release. It contains a number of important bug fixes. - implement failsafe PWM in IOMCU, for AFS failsafe when FMU dies - handle reversed channels correctly in AFS failsafe - fixed twin motor plane handling in AFS failsafe - fixed a bug in Q_ASSIST_SPEED support for tiltrotors that could lead to zero throttle when assistance triggers. - lower default PTCH2SRV_D to 0.04 after reports of oscillation on small flying wings - added speed scaler reduction in Q modes when at low airspeed - fixed synthetic airspeed estimation to be along +ve X axis - fixed relaxing of VTOL attitude controller on transition (thanks to Leonard Hall) - default COMPASS_AUTO_ROT to 2 on all boards - fixed UART speed rounding bug that caused failure at high board rates - fixed a short glitch in position control on quadplane transition (many thanks to Leonard for lots of help with this) - fixed RSSI voltage from IOMCU Thanks to everyone who has contributed, and please report all test results with this beta. Happy flying! Release 3.9.2beta1, 12th September 2018 --------------------------------------- The is the first beta release of the plane 3.9.2 stable release. It contains a number of important bug fixes. - fixed a quadplane bug that could cause large attitude instability during takeoff if the aircraft does not have enough power to climb to its target height. Thanks to Leonard for the fix. - fixed a bug that prevented dead-reckoning working on GPS loss. - fixed an ADC bug that prevented some boards from using all of their analog input. Thanks to vierfuffzig for reporting! - fixed a bug in advanced failsafe support that left RC input to throttle active after termination. Thanks to Michael Thomas for finding this bug. - fixed use of OLED displays on the first I2C bus on systems with two I2C buses Thanks to everyone who has contributed, and please report all test results with this beta. Happy flying! Release 3.9.1, 31st August 2018 ------------------------------- The ArduPilot dev team are delighted to announce a new stable plane release. This is a minor release, but does include some important fixes. The only change over the 3.9.1beta3 release is an increase in the USB buffer size to give faster log download over USB. Other important changes from the 3.9.1beta releases include: - updated to default values for some tuning parameters - fixed a critical safety issue found by Oliver Volkmann, and fixed by Michael du Breuil. The problem could lead to quadplane motors starting on reboot - fixed a bug where RC failsafe could lead rudder input stuck at the last rudder input value in some modes. Thanks to Michael du Breuil for the fix - improved DShot and BLHeli-passthrough support, fixing errors reported by BLHeli32 ESCs and making using BLHeliSuite32 much more reliable - new tonealarm system, bringing the tones produced under ChibiOS and Linux HALs in line with tones produced under the HAL_PX4 HAL. - added a new LED driver for the NCP5623 LED - fixed delay caused by parameter writes in AP_Stats - fixed default RSSI input pin on some boards - fixed the incorrect display of "no io thread heartbeat" message - fixed microSD support on some boards due to running out of DMA capable memory Many thanks to everyone who has been testing the beta releases. Happy flying! Release 3.9.1beta3, 23rd August 2018 ------------------------------------ This is the third beta for the 3.9.1 release, which is a minor update over 3.9.0. This release includes the following changes: - fixed a critical safety issue found by Oliver Volkmann, and fixed by Michael du Breuil. The problem could lead to quadplane motors starting on reboot - fixed a bug where RC failsafe could lead rudder input stuck at the last rudder input value in some modes. Thanks to Michael du Breuil for the fix - raised OSD thread stack size to 1024 (needed for new OSD items) Thanks to everyone who is testing the 3.9.1beta series! Release 3.9.1beta2, 17th August 2018 ------------------------------------ This is a the second beta for the 3.9.1 release, which is a minor update over 3.9.0. This release includes the following changes: - increased default buffer sizes in dataflash for some boards - fixed a bug with small dataflash buffers - updated OSD with new items: hdop, temperature, waypoint, xtrack, flight distance, flighttime, efficiency (thanks to Hwurzburg, vierfuffzig and sh83). - reduced memory usage in serial buffers - adjusted some default parameters to give a better first flight experience for more users. The default parameter changes are: - RLL2SRV_P from 0.6 to 1.0 - RLL2SRV_I from 0.1 to 0.3 - RLL2SRV_D from 0.02 to 0.08 - PTCH2SRV_P from 0.6 to 1.0 - PTCH2SRV_I from 0.1 to 0.3 - PTCH2SRV_D from 0.02 to 0.08 - TECS_PITCH_MAX from 0 to 15 - NAVL1_PERIOD from 20 to 17 The PID parameter changes won't affect anyone who has done some tuning, but will make the first flight experience for a new user be a lot better for nearly all aircraft. Paul and I decided on the values based on experience with users flight logs, plus the experience users have had with AUTOTUNE mode. Please report testing results! Happy flying Release 3.9.1beta1, 15th August 2018 ------------------------------------ This is a the first beta for the 3.9.1 release, which is a minor update over 3.9.0. This release includes the following changes: - improved DShot and BLHeli-passthrough support, fixing errors reported by BLHeli32 ESCs and making using BLHeliSuite32 much more reliable - new tonealarm system, bringing the tones produced under ChibiOS and Linux HALs in line with tones produced under the HAL_PX4 HAL. - added a new LED driver for the NCP5623 LED - fixed delay caused by parameter writes in AP_Stats - fixed default RSSI input pin on some boards - fixed the incorrect display of "no io thread heartbeat" message - fixed microSD support on some boards due to running out of DMA capable memory Given the changes are quite small, I hope to make this a fairly short beta cycle. Please test it and report both success and failure. Happy flying! Release 3.9.0, 6th August 2018 ------------------------------ The ArduPilot development team is delighted to announce a new stable release of plane, version 3.9.0. For those of you who have been testing the 3.9.0beta releases then you won't see any surprises here. That are no changes since 3.9.0beta6. Also, many thanks for testing the betas! For those of you coming from the last stable 3.8.5 release there are a lot of changes. For a start, this is the first release to support both the ChibiOS RTOS on STM32 boards and the NuttX RTOS. Previously stable releases only used the NuttX RTOS. The ArduPilot project is moving to ChibiOS for future releases, and we expect to drop support for the NuttX builds for the next major stable release (which will probably be called 3.10.0). When you install the 3.9.0 release on board such as a Pixhawk1, Cube or Pixracer you have a choice of which build to use. Choosing ChibiOS will give you better performance and some very nice new features. Choosing the NuttX (also known as "PX4" builds) will get you the same base that we have been using for years. There are a few features that are in the NuttX build but not yet in the ChibiOS build, in particular the ChibiOS build does not yet support PWM based rangefinders. That will be fixed in a future release. This release has a lot of new features. Some of the most important ones are: - DShot support for controlling ESCs - BLHeli pass-thru support for ESC configuration - automatic compass orientation on calibrating compasses - improved VTOL flight code, with improved transition support and loiter - support for Devo telemetry output - new battery monitoring system, with more flexible failsafes - built-in OSD support for boards with a MAX7456 OSD device In addition, this release supports a lot of new flight boards, including: - AirbotF4 - F4BY - KakuteF4 - KakuteF7 - MatekF405 - MatekF405-Wing - mindpx-v2 - mini-pix - Omnibusf4pro - Omnibusf7V2 - Pixhawk4 and Pixhawk4-mini - CUAVv5 - revo and revo-mini - sparky2 We also now have custom ChibiOS based builds for some existing boards, including: - CubeBlack - mRoX21 - Pixhawk1 - Pixracer This means you now have a lot more choice in selecting a flight board to use with ArduPilot. This release was made possible thanks to contributions from dozens of volunteer developers in the dev team. In total there are over 5 thousand changes since the 3.8.5 release. Special thanks to: - Siddharth Purohit - Tom Pittenger - Randy Mackay - Michael du Breuil - Peter Barker - Mark Whitehorn - Paul Riseborough - Francisco Ferreira - Jonathan Challinger - Leonard Hall - Alexander Malishev - Nathan E - Marco Robustini - Luis Vale Gonçalves - night-ghost - Patrick José Pereira - Lucas De Marchi - Eugene Shamaev - Philip Rowse - Amilcar Lucas - Kelly Foster - Fnoop - Pierre Kancir - Stephen Dade - Jaime Machuca - vierfuffzig - Henry Wwurzburg - Malcolm Churn - Holger Steinhaus We hope you enjoy flying this release as much as we enjoyed making it. Happy flying! Release 3.9.0beta6, 30th July 2018 ---------------------------------- This is the sixth in a series of beta releases for plane 3.9.0. I aims to be the final beta. Changes in this release are: - added Q_TAILSIT_THSCMX parameter for tailsitters (thanks to IamPete) - added KakuteF7 bootloader - fixed arming error with trim on unusued RC channels - fixed microSD support on KakureF7 and OmnibusF7V2 (thanks sh83) - fixed VL53L0X rangefinder driver - added Pixhawk1 ChibiOS build - fixed update rate for servos in tailsitters - set COMPASS_AUTO_ROT to 2 for most boards - improved OmnibusF7V2 support - support all external compasses on mini-pix - clear COMPASS_DEV_ID for unused compasses Happy flying! Release 3.9.0beta5, 19th July 2018 ---------------------------------- This is the fifth in a series of beta releases for plane 3.9.0. It fixes two important bugs over 3.9.0beta4 - fixed RC failsafe on IOMCU when a SBUS receiver is set to "hold" mode - allowed for RC override failsafe to support holding override value on timeout Thanks to Jon and Michael for the failsafe fixes! It also includes two smaller changes: - updated F4BY board id, and added F4BY to autobuild list - fixed UARTD for px4-v1 build Release 3.9.0beta4, 18th July 2018 ---------------------------------- This is the fourth in a series of beta releases for plane 3.9.0. It is a major release, with a lot of changes. - fixed compass detection on pixracer - greatly improved OSD support - fixed ARMING_REQUIRE=2 support (thanks Marco!) - added automatic compass orientation support - added probe for all external compasses on new ChibiOS boards - fixed arming with compass disabled - fixed flow control on F7 based boards - fixed prealloc of DMA bouncebuffers - added board specific builds for mRoX21 and Pixracer - fixed mRoX21 IMU detection Many thanks to all who contributed to this release, and our beta testers! Release 3.9.0beta3, 11th July 2018 ---------------------------------- This is the third in a series of beta releases for plane 3.9.0. It is a minor update to beta2 Changes are: - fixed nul termination of system ID on ChibiOS - added PH4-mini support - fixed compass orientation on fmuv5 - matched BRD_PWM_COUNT between px4-v3 and fmuv3 - fixed MatekF405-Wing compass orientation - backup storage to microSD if possible Release 3.9.0beta2, 6th July 2018 --------------------------------- This is the second in a series of beta releases for plane 3.9.0. It is a major release, with a lot of changes. - Builtin OSD support on boards with MAX7456 OSD device - fixed throttle display on twin-engine planes - improved timing in mavlink remote sensors - added many more board types to autobuild - fixed airspeed reporting for unhealthy sensors - fixed log timestamps on ChibiOS - added force arm option - added fmuv5 support - added CubeBlack build - added ESC telemetry virtual battery - added SERIAL6 on fmuv4 and fmuv5 - added MatekF405-Wing support - added AP_Bootloader - support bootloader update over MAVLink - enable sdcard on several F4 boards - fixed serial number logging on ChibiOS boards - fixed revo-mini compass orientation Many thanks to all who contributed to this release, and our beta testers! Release 3.9.0beta1, 21st May 2018 --------------------------------- This is the first in a series of beta releases for plane 3.9.0. It is a major release, with a lot of changes. The main changes are for supporting two new HALs (hardware abstraction layers). One is the port to ChibiOS and the second is the F4Light HAL. These ports bring a host of new flight board options, and a lot of new features. Some highlights include: - support for many inexpensive STM32F4 based flight boards - support for DShot output for BLHeli ESCs, including ESC telemetry feedback - new battery monitoring system with more flexible failsafe options - support for Devo telemetry output - a new position hold library for multicopters which improves quadplane VTOL support This release is fully compatible with previous releases, and users should not notice a significant difference in flight. The focus of the beta testing will be on ensuring that the new flight board support is stable. Happy flying! Release 3.8.5, 25th April 2018 ------------------------------ This release includes small bug fixes and one safety fix. The changes are: - fixed an issue where the external safety button can activate in flight on some boards, causing them to crash. A new parameter BRD_SAFETYOPTION is added which controls the behaviour of the safety button. The default is to de-activate the safety button when armed. - fixed default orientation of ICM-20948 compass for Here GPS - added support for dual airspeed sensors - added support for the SDP33 airspeed sensor. This is still considered experimental. There are reports of it underestimating the aircrafts speed at higher altitudes. - add support for the MS5525 airspeed sensor on multiple I2C addresses. Two new values of the ARSDP_TYPE are introduced (4 and 5) for specific I2C addresses. This allows you to deconflict the MS5525 from a MS5611 barometer on the same bus. Release 3.8.4, 9th January 2018 ------------------------------- This is a minor release with just two small changes. The first change is to fix a timing bug in the MS5525 airspeed sensor driver. That bug was causing unreliable airspeed sensing. Thanks to David Ingraham for providing logs that helped find the issue. The second change is to fix transitions in AUTO mode in tailsitter. The transition for tailsitters was causing instability on transition from vertical takeoff to forward flight. Release 3.8.3, 13th November 2017 --------------------------------- This is a minor release with a number of important bug fixes and some small feature additions. The most important general fixes are for an I2C device detection bug and fixing the implementation of MANUAL_RCMASK. There are quite a number of small fixes in lots of areas, plus big improvements to the handling of tailsitter transitions. Another significant change is to the handling of transitions from RTL to QRTL when Q_RTL_MODE=1. We now transition to QRTL at a distance which is the maximum of RTL_RADIUS and a distance calculated based on a new Q_TRANS_DECEL "transition deceleration" parameter. That allows you to tune the amount of deceleration you want in the transition according to how much drag your quadplane has. This also means it automatically accounts for wind speed and approach speed in calculating the transition point. We have also added a new Q_OPTIONS parameter which is a bitmask of option flags to control quadplane behaviour. We have three options so far. The first is to allow for keeping the wings within LEVEL_ROLL_LIMIT degrees during transitions, for users that prefer transitions to be kept level. The 2nd and 3rd options are to treat NAV_TAKEOFF as NAV_VTOL_TAKEOFF and NAV_LAND as NAV_VTOL_LAND in quadplane missions, so that you can use GCS software that doesn't know about the VTOL takeoff and land commands. - allow vertical takeoffs in GUIDED mode with Q_GUIDED_MODE=0 - fixed a bug in implementation of MANUAL_RCMASK - eliminate airspeed positive bias after offset zero - prevent quadplane controller windup on the ground - added Q_MAV_TYPE for setup of VTOL vehicle type for QGC - improved performance of FlightAxis SITL - support LOITER_TO_ALT in quadplanes - fixed a bug in TECS related to descending quadplane transitions - added Q_OPTIONS for controlling roll during transitions and allowing for fixed wing takeoff and landing - fixed a race condition in IMU logging - fixed a race in i2c device probing - log critical messages while disarmed - added IST8310 compass on FMUv3 I2C - probe for QMC5883 by default - avoid double detection of AK09916 compass - smooth out tailsitter transitions in both directions - fixed use of RTL_RADIUS for QRTL threshold and added Q_TRANS_DECEL - fixed course unlocking with rudder in CRUISE mode We hope you have as much fun flying this release as we had producing it. Happy flying! Release 3.8.2, 11th September 2017 ---------------------------------- This is a minor release, with a few small fixes and one important crash bug fix. The crash bug is in the Septentrio (SBF) GPS driver. Anyone flying with an SBF GPS should update to this release. The driver had a bug that could cause a in-flight crash under some circumstances. Other changes in this release are: - support takeoff in GUIDED mode for quadplanes - support changing target altitude while hovering in GUIDED mode for quadplanes - improved descent rate control in QRTL and QLAND modes. This fixes an issue with higher than configured descent rates, and smoothes out the change in descent rate for the change to the final landing stage - smooth out the transition to QLOITER or QLAND when transitioning from fixed wing mode. This prevents the sudden nose up when changing to QLOITER or QLAND mode while flying at high speed. - added MANUAL_CONTROL support, allowing for joystick control from QGroundControl Happy flying! Release 3.8.1, 3rd September 2017 --------------------------------- This is a bugfix release for 3.8.0, with just a few small changes, and only one new feature. The bug fixes are: - removed TRIM_RC_AT_START option, as this was causing significant issues - fixed bug in TRIM_AUTO support with differential spoilers - fixed bug with RCn_TRIM == RCn_MIN in MANUAL mode - fixed combination of TKOFF_THR_MINACC and TKOFF_THR_DELAY - fixed a bug in sending STATUSTEXT messages on all MAVLink channels The new feature is that you can set the protocol for the debug UART on FMUv2 or FMUv3 board (such as a Pixhawk or Cube) to allow allow UART5 to be used for arbitrary protocols. To use this fetaure just set SERIAL5_PROTOCOL to the desired serial protocol. This should be useful to users who have multiple serial devices (such as rangefinders) they want to connect and have run out of UARTs. Happy flying! Release 3.8.0, 5th August 2017 ------------------------------ The ArduPilot development team is very proud to announce the release of APM:Plane 3.8.0. This is a major release, with a lot of new features and improvements. The release has been a long time coming, and the dev team would like to thank everyone who has contributed, in terms of code and documentation as well as the many testers of beta versions of the code. To help with migration from the 3.7.1 release to 3.8.0 there is a migration guide here: http://ardupilot.org/plane/docs/plane-3-7-to-3-8-migration.html All users should read the migration guide carefully. While the firmware will try to auto-migrate most settings, please do very careful ground tests before your first flight with 3.8. In total there have been over 4 thousand changes in the ArduPilot git tree since the 3.7.1 release, with over four hundred of those specific to fixed wing aircraft. Listing all of them in these release notes is not practical, but the following list will give some of the larger changes: - addition of EKF3 support (disabled by default) - new SERVO parameter system for servo output configuration - support for MS5525 airspeed sensor - support for a wide range of tiltrotor quadplanes - support for tailsitter aircraft (including vectored tailsitters) - support for twin-motor aircraft, with differential thrust - new system for elevon, vtail, flaperon and differential spoiler setup - support for deep stall landings - support for dual-gps blending - support for masking compass types for driver loading - completely new DMA based and high sample rate IMU drivers - support for px4pro board from Drotek - several new compass drivers, new IMU drivers and new GPS drivers - new MANUAL_RCMASK system for fine-grained MANUAL flight setup - support for log rotation on disarm - numerous quadplane improvements - fixed loiter behaviour with Q_GUIDED_MODE=1 - allow rudder arming in CRUISE and FBWB modes - fixed bug in transmitter tuning support - fixed bug in attitude integrator zero on mode change - added SYSID_ENFORCE parameter - fixed support for vtail rudder-only planes - greatly improved automatic landing accuracy - support for high update rates on all servos with SERVO_RATE parameter - greatly improved UAVCAN support, with parameters now in CAN_ parameter space - support for prop-hang on 3D aircraft - improved quadplane PID logging - smoother takeoffs for quadplanes - logging of side-slip and angle-of-attack estimates - added AETR, pre-mixer logging - automatic thermalling support Release 3.8.0beta5, 1st May 2017 -------------------------------- The ArduPilot development team is proud to announce the release of version 3.8.0beta of APM:Plane. This is a major release. All users should carefully check their setup when upgrading. Major changes include: - new SRV_Channel system for setting up of output servos separately from input RC channels - new elevon and vtail support system - new EKF3 state estimator (not enabled by default yet) - support for tailsitter aircraft - greatly improved support for tilt-rotor quadplanes - greatly improved quadplane transition code - support for deepstall landing - large improvements in airspeed noise handling - much improved RTK GPS support - support automatic servo trimming - greatly improved automatic landing accuracy - significant improvements in altitude handling - significant improvement in sensor drivers, with higher sample rates and improved vibration resistance On top of that there have been hundreds of smaller improvements and bug fixes. From the users point of view the most significant change in setup is moving of RCn_FUNCTION parameters into new SERVOn_FUNCTION parameters, and the creation of separate output MIN/MAX/TRIM values for all servo outputs. This allows for much more flxible output setup that is independent of RC input setup. Release 3.7.1, 21st October 2016 -------------------------------- The ArduPilot development team is proud to announce the release of version 3.7.1 of APM:Plane. This is a minor bug fix release. A major release of 3.8.0 is also being prepared now and will be in beta soon. Changes in this release: - fixed arming check error on FMUv4 (pixracer) - fixed pilot throttle based motor test for quadplane - fixed use of multicopter mix_max in quadplane - fixed AFS termination bugs for quadplanes - added automatic ICE engine cut in QLAND - fixed loiter mode with Q_GUIDED_MODE=1 - fixed navigation at lattitude of exactly zero - fixed quadplane transition without airspeed sensor - fixed rudder arming in CRUISE and FBWB modes - fixed throttle slew rate in MANUAL mode for quadplanes - fixed multiple bugs in transmitter tuning for quadplane rates - fixed mavlink system ID in early startup on USB - slow down update of home position - update Disco battery lookup table - improved compass calibration code for larger offsets Many thanks to everyone who contributed to this release! Release 3.7.0, 9th September 2016 --------------------------------- The ArduPilot development team is proud to announce the release of version 3.7.0 of APM:Plane. This is a major update so please read the notes carefully. The biggest changes in this release are: - more reliable recovery from inverted flight - automatic IC engine support - Q_ASSIST_ANGLE for stall recovery on quadplanes - Pixhawk2 IMU heater support - PH2SLIM support - AP_Module support - Parrot Disco support - major VRBrain support merge - much faster boot time on Pixhawk I'll give a bit of detail on each of these changes before giving the more detailed list of changes. More reliable recovery from inverted flight Marc Merlin discovered that on some types of gliders that ArduPilot would not reliably recover from inverted flight. The problem turned out to be the use of the elevator at high bank angles preventing the ailerons from fully recovering attitude. The fix in this release prevent excessive elevator use when the aircraft is beyond LIM_ROLL_CD. This should help a lot for people using ArduPilot as a recovery system for manual FPV flight. Automatic IC engine support ArduPilot has supported internal combustion engines for a long time, but until now the pilot has had to control the ignition and starter manually using transmitter pass throughs. A new "ICE" module in ArduPilot now allows for fully automatic internal combustion engine support. Coupled with an RPM sensor you can setup your aircraft to automatically control the ignition and starter motor, allowing for one touch start of the motor on the ground and automatic restart of the motor in flight if needed. The IC engine support is also integrated into the quadplane code, allowing for automatic engine start at a specified altitude above the ground. This is useful for tractor engine quadplanes where the propeller could strike the ground on takeoff. The engine can also be automatically stopped in the final stage of a quadplane landing. Q_ASSIST_ANGLE for stall recovery Another new quadplane feature is automatic recovery from fixed wing stall. Previously the VTOL motors would only provide assistance in fixed wing modes when the aircraft airspeed dropped below Q_ASSIST_SPEED. Some stalls can occur with higher airspeed however, and this can result in the aircraft losing attitude control without triggering a Q_ASSIST_SPEED recovery. A new parameter Q_ASSIST_ANGLE allows for automatic assistance when attitude control is lost, triggering when the attitude goes outside the defined roll and pitch limits and is more than Q_ASSIST_ANGLE degrees from the desired attitude. Many thanks to Iskess for the suggestion and good discussion around this feature. Pixhawk2 heated IMU support This release adds support for the IMU heater in the upcoming Pixhawk2, allowing for more stable IMU temperatures. The Pixhawk2 is automatically detected and the heater enabled at boot, with the target IMU temperature controllable via BRD_IMU_TARGTEMP. Using an IMU heater should improve IMU stability in environments with significant temperature changes. PH2SLIM Support This release adds support for the PH2SLIM variant of the Pixhawk2, which is a Pixhawk2 cube without the isolated sensor top board. This makes for a very compact autopilot for small aircraft. To enable PH2SLIM support set the BRD_TYPE parameter to 6 using a GCS connected on USB. AP_Module Support This is the first release of ArduPilot with loadable module support for Linux based boards. The AP_Module system allows for externally compiled modules to access sensor data from ArduPilot controlled sensors. The initial AP_Module support is aimed at vendors integrating high-rate digital image stabilisation using IMU data, but it is expected this will be expanded to other use cases in future releases. Parrot Disco Support This release adds support for the Parrot C.H.U.C.K autopilot in the new Disco airframe. The Disco is a very lightweight flying wing with a nicely integrated Linux based autopilot. The Disco flies very nicely with ArduPilot, bringing the full set of mission capabilities of ArduPilot to this airframe. Major VRBrain Support Update This release includes a major merge of support for the VRBrain family of autopilots. Many thanks to the great work by Luke Mike in putting together this merge! Much Faster Boot Time Boot times on Pixhawk are now much faster due to a restructuring of the driver startup code, with slow starting drivers not started unless they are enabled with the appropriate parameters. The restructuring also allows for support of a wide variety of board types, including the PH2SLIM above. This release includes many other updates right across the flight stack, including several new features. Some of the changes include: - improved quadplane auto-landing - limit roll and pitch by Q_ANGLE_MAX in Q modes - improved ADSB avoidance and MAVLink streaming - smoother throttle control on fixed-wing to VTOL transition - removed "demo servos" movement on boot - fixed a problem with spurious throttle output during boot (thanks to Marco for finding this) - support MAVLink SET_ATTITUDE_TARGET message - log all rally points on startup - fixed use of stick mixing for rudder with STICK_MIXING=0 - fixed incorrect tuning warnings when vtol not active - support MAVLink based external GPS device - support LED_CONTROL MAVLink message - prevent baro update while disarmed for large height change - support PLAY_TUNE MAVLink message - added AP_Button support for remote button input reporting - support Ping2020 ADSB transceiver - fixed disarm by rudder in quadplanes - support 16 channel SERVO_OUTPUT_RAW in MAVLink2 - added automatic internal combustion engine support - support DO_ENGINE_CONTROL MAVLink message - added ground throttle suppression for quadplanes - added MAVLink reporting of logging subsystem health - prevent motor startup on reboot in quadplanes - added quadplane support for Advanced Failsafe - added support for a 2nd throttle channel - fixed bug in crash detection during auto-land flare - lowered is_flying groundspeed threshold to 1.5m/s - added support for new FrSky telemetry protocol variant - added support for fence auto-enable on takeoff in quadplanes - added Q_ASSIST_ANGLE for using quadplane to catch stalls in fixed wing flight - added BRD_SAFETY_MASK to allow for channel movement for selected channels with safety on - numerous improvements to multicopter stability control for quadplanes - support X-Plane10 as SITL backend - lots of HAL_Linux improvements to bus and thread handling - fixed problem with elevator use at high roll angles that could prevent attitude recovery from inverted flight - improved yaw handling in EKF2 near ground - added IMU heater support on Pixhawk2 - allow for faster accel bias learning in EKF2 - fixed in-flight yaw reset bug in EKF2 - added AP_Module support for loadable modules - support Disco airframe from Parrot - use full throttle in initial takeoff in TECS - added NTF_LED_OVERRIDE support - added terrain based simulation in SITL - merged support for wide range of VRBrain boards - added support for PH2SLIM and PHMINI boards with BRD_TYPE - greatly reduced boot time on Pixhawk and similar boards - fixed magic check for signing key in MAVLink2 - fixed averaging of gyros for EKF2 gyro bias estimate Release 3.6.0, 6th June 2016 ---------------------------- The ArduPilot development team is proud to announce the release of version 3.6.0 of APM:Plane. This is a major update so please read the notes carefully. The biggest changes in this release are: - major update to PX4Firmware code - major update to QuadPlane code - addition of MAVLink2 support The updated PX4Firmware tree greatly improves support for the new Pixracer boards as well as improving scheduling performance and UAVCAN support. The QuadPlane changes are very extensive in this release. A lot of new features have been added, including: - improved automatic weathervaning - greatly improved support for mixed fixed wing and VTOL missions - automatic RTL with VTOL land - VTOL GUIDED mode support - greatly improved transition code - new tuning system for VTOL motors - extensive upgrade to logging system for much better flight analysis The new QuadPlane features are documented at: http://ardupilot.org/plane/docs/quadplane-support.html There is also a prototype implementation supporting tiltrotors and tiltwings, but so far it has only been flown in simulations and it should be considered very experimental. Detailed changes include: - added motortest for all quad motors in sequence - merge upstream PX4Firmware changes - new AC_AttitudeControl library from copter for quadplane - modified default gains for quadplanes - new velocity controller for initial quadplane landing - smooth out final descent for VTOL landing - changed default loop rate for quadplanes to 300Hz - support up to 16 output channels (two via SBUS output only) - fixed bug with landing flare for high values of LAND_FLARE_SEC - improved crash detection logic - added in-flight transmitter tuning - fix handling of SET_HOME_POSITION - added Q_VFWD_GAIN for forward motor in VTOL modes - added Q_WVANE_GAIN for active weathervaning - log the number of lost log messages - Move position update to 50hz loop rather then the 10hz - Suppress throttle when parachute release initiated, not after release. - support Y6 frame class in quadplane - log L1 xtrack error integrator and remove extra yaw logging - limit roll before calculating load factor - simplify landing flare logic - smooth-out the end of takeoff pitch by reducing takeoff pitch min via TKOFF_PLIM_SEC - added support for DO_VTOL_TRANSITION as a mission item - fixed is_flying() for VTOL flight - added Q_ENABLE=2 for starting AUTO in VTOL - reload airspeed after VTOL landing - lower default VTOL ANGLE_MAX to 30 degrees - Change mode to RTL on end of mission rather then staying in auto - implemented QRTL for quadplane RTL - added Q_RTL_MODE parameter for QRTL after RTL approach - reduced the rate of EKF and attitude logging to 25Hz - added CHUTE_DELAY_MS parameter - allow remapping of any input channel to any output channel - numerous waf build improvements - support fast timer capture for camera trigger feedback - numerous improvements for Pixracer support - added more general tiltrotor support to SITL - only save learned compass offsets when disarmed - support MISSION_ITEM_INT for more accurate waypoint positions - change parachute deployment altitude to above ground not home - added AP_Tuning system for QuadPlane tuning - added initial support for tiltrotors and tiltwings - added LOG_REPLAY and LOG_DISARMED parameters - added Q_GUIDED_MODE parameter - major update to QuadPlane documentation - added MAVLink2 support - fixed origin vs home altitude discrepancy - improved Lidar based landing glide slope - fixed throttle failsafe with THR_PASS_STAB=1 - prevent EKF blocking during baro and airspeed cal - allow for ground testing of parachutes with CHUTE_MINALT=0 - fixed elevator stick mixing for above 50% input - added QuadPlane ESC calibration Release 3.6.0beta1, 30th April 2016 ----------------------------------- The ArduPilot development team is proud to announce the release of version 3.6.0beta1 of APM:Plane. This is the first beta version of a major release. The biggest changes in this release is the major update of the PX4Firmware tree which greatly improves support for the Pixracer board, and a lot of QuadPlane improvements and new features. Detailed changes include: - added motortest for all quad motors in sequence - merge upstream PX4Firmware changes - new AC_AttitudeControl library from copter for quadplane - modified default gains for quadplanes - new velocity controller for initial quadplane landing - smooth out final descent for VTOL landing - changed default loop rate for quadplanes to 300Hz - support up to 16 output channels (two via SBUS output only) - fixed bug with landing flare for high values of LAND_FLARE_SEC - improved crash detection logic - added in-flight transmitter tuning - fix handling of SET_HOME_POSITION - added Q_VFWD_GAIN for forward motor in VTOL modes - added Q_WVANE_GAIN for active weathervaning - log the number of lost log messages - Move position update to 50hz loop rather then the 10hz - Suppress throttle when parachute release initiated, not after release. - support Y6 frame class in quadplane - log L1 xtrack error integrator and remove extra yaw logging - limit roll before calculating load factor - simplify landing flare logic - smooth-out the end of takeoff pitch by reducing takeoff pitch min via TKOFF_PLIM_SEC - added support for DO_VTOL_TRANSITION as a mission item - fixed is_flying() for VTOL flight - added Q_ENABLE=2 for starting AUTO in VTOL - reload airspeed after VTOL landing - lower default VTOL ANGLE_MAX to 30 degrees - Change mode to RTL on end of mission rather then staying in auto - implemented QRTL for quadplane RTL - added Q_RTL_MODE parameter for QRTL after RTL approach - reduced the rate of EKF and attitude logging to 25Hz - added CHUTE_DELAY_MS parameter - allow remapping of any input channel to any output channel - numerous waf build improvements - support fast timer capture for camera trigger feedback - numerous improvements for Pixracer support - added more general tiltrotor support to SITL Release 3.5.3, 30th April 2016 ------------------------------ The ArduPilot development team is proud to announce the release of version 3.5.3 of APM:Plane. This is a minor release with only small bugfix changes. The main motivation for the release is a problem with flying without a compass enabled. If you fly 3.5.2 with MAG_ENABLE=0 or no compass attached then there is a risk that the EKF2 attitude estimator may become unstable before takeoff. This can cause the aircraft to crash. The other changes in this release are: - fixed loiter radius for counter-clockwise loiter - fixed the loiter radius when doing a RTL at the end of a mission - provide reasons to the GCS when a uBlox GPS fails to properly configure - support a wider variety of NMEA GPS receivers - use EKF1 by default if no compass is enabled Happy flying! Release 3.5.2, 26th March 2016 ------------------------------ The ArduPilot development team is proud to announce the release of version 3.5.2 of APM:Plane. This is a minor release with small changes. The main reason for this release over 3.5.1 is a fix for a bug where the px4io co-processor on a Pixhawk can run out of memory while booting. This causes the board to be unresponsive on boot. It only happens if you have a more complex servo setup and is caused by too much memory used by the IO failsafe mixer. The second motivation for this release is to fix an issue where during a geofence altitude failsafe that happens at low speed an aircraft may dive much further than it should to gain speed. This only happened if the thrust line of the aircraft combined with low pitch integrator gain led to the aircraft not compensating sufficiently with elevator at full throttle in a TECS underspeed state. To fix this two changes have been made: - a minimum level of integrator in the pitch controller has been added. This level has a sufficiently small time constant to avoid the problem with the TECS controller in an underspeed state. - the underspeed state in TECS has been modified so that underspeed can end before the full target altitude has been reached, as long as the airspeed has risen sufficiently past the minimum airspeed for a sufficient period of time (by 15% above minimum airspeed for 3 seconds). The default P gains for both roll and pitch have also been raised from 0.4 to 0.6. This is to help for users that fly with the default parameters. A value of 0.6 is safe for all aircraft that I have analysed logs for. The default gains and filter frequencies of the QuadPlane code have also been adjusted to better reflect the types of aircraft users have been building. Other changes include: - improved QuadPlane logging for better analysis and tuning (adding RATE and QTUN messages) - fixed a bug introduced in 3.5.1 in rangefinder landing - added TECS logging of speed_weight and flags - improvements to the lsm303d driver for Linux - improvements to the waf build system Release 3.5.1, 21st March 2016 ------------------------------ The ArduPilot development team is proud to announce the release of version 3.5.1 of APM:Plane. This is a minor release with primarily small changes. The changes in this release are: - update uavcan to new protocol - always exit loiter in AUTO towards next waypoint - support more multicopter types in quadplane - added support for reverse thrust landings - added LAND_THR_SLEW parameter - added LAND_THEN_NEUTRL parameter - fixed reporting of armed state with safety switch - added optional arming check for minimum voltage - support motor test for quadplanes - added QLAND flight mode (quadplane land mode) - added TECS_LAND_SRC (land sink rate change) - use throttle slew in quadplane transition - added PID tuning for quadplane - improved text message queueing to ground stations - added LAND_THR_SLEW parameter - re-organisation of HAL_Linux bus API - improved NMEA parsing in GPS driver - changed TECS_LAND_SPDWGT default to -1 - improved autoconfig of uBlox GPS driver - support a wider range of Lightware serial Lidars - improved non-GPS performance of EKF2 - allow for indoor flight of quadplanes - improved compass fusion in EKF2 - improved support for Pixracer board - improved NavIO2 support - added BATT_WATT_MAX parameter The reverse thrust landing is particularly exciting as that adds a whole new range of possibilities for landing in restricted areas. Many thanks to Tom for the great work on getting this done. The uavcan change to the new protocol has been a long time coming, and I'd like to thank Holger for both his great work on this and his patience given how long it has taken to be in a release. This adds support for automatic canbus node assignment which makes setup much easier, and also supports the latest versions of the Zubax canbus GPS. My apologies if your favourite feature didn't make it into this release! There are a lot more changes pending but we needed to call a halt for the release eventually. This release has had a lot of flight testing and I'm confident it will be a great release. Happy flying! Release 3.5.0, 30th January 2016 -------------------------------- The ArduPilot development team is proud to announce the release of version 3.5.0 of APM:Plane. This is a major release with a lot of changes so please read the notes carefully! The biggest changes in this release are: - switch to new EKF2 kalman filter for attitude and position estimation - added support for parachutes - added support for QuadPlanes - support for 4 new flight boards, the QualComm Flight, the BHAT, the PXFmini and the Pixracer - support for arming on moving platforms - support for better camera trigger logging New Kalman Filter The 3.4 release series was the first where APM:Plane used a Kalman Filter by default for attitude and position estimation. It works very well, but Paul Riseborough has been working hard recently on a new EKF variant which fixes many issues seen with the old estimator. The key improvements are: - support for separate filters on each IMU for multi-IMU boards (such as the Pixhawk), giving a high degree of redundency - much better handling of gyro drift estimation, especially on startup - much faster recovery from attitude estimation errors After extensive testing of the new EKF code we decided to make it the default for this release. You can still use the old EKF if you want to by setting AHRS_EKF_TYPE to 1, although it is recommended that the new EKF be used for all aircraft. Parachute Support This is the first release with support for parachute landings on plane. The configuration and use of a parachute is the same as the existing copter parachute support. See http://copter.ardupilot.org/wiki/parachute/ Note that parachute support is considered experimental in planes. QuadPlane Support This release includes support for hybrid plane/multi-rotors called QuadPlanes. More details are available in this blog post: http://diydrones.com/profiles/blogs/quadplane-support-in-apm-plane-3-5-0 Support for 4 new Flight Boards The porting of ArduPilot to more flight boards continues, with support for 3 new flight boards in this release. They are: - the BHAT board - the PXFmini - the QualComm Flight - the Pixracer More information about the list of supported boards is available here: https://ardupilot.org/copter/docs/common-autopilots.html Startup on a moving platform One of the benefits of the new EKF2 estimator is that it allows for rapid estimation of gyro offset without doing a gyro calibration on startup. This makes it possible to startup and arm on a moving platform by setting the INS_GYR_CAL parameter to zero (to disable gyro calibration on boot). This should be a big help when flying off boats. Improved Camera Trigger Logging This release adds new CAM_FEEDBACK_PIN and CAM_FEEDBACK_POL parameters. These add support for separate CAM and TRIG log messages, where TRIG is logged when the camera is triggered and the CAM message is logged when an external pin indicates the camera has actually fired. This pin is typically based on the flash hotshoe of a camera and provides a way to log the exact time of camera triggering more accurately. Many thanks to Dario Andres and Jaime Machuca for their work on this feature. That is just a taste of all of the improvements in this release. In total the release includes over 1500 patches. Some of the other more significant changes include: - RPM logging - new waf build system - new async accel calibrator - SITL support for quadplanes - improved land approach logic - better rangefinder power control - ADSB adapter support - dataflash over mavlink support - settable main loop rate - hideable parameters - improved crash detection logic - added optional smooth speed weighting for landing - improved logging for dual-GPS setups - improvements to multiple RTK GPS drivers - numerous HAL_Linux improvements - improved logging of CAM messages - added support for IMU heaters in HAL_Linux - support for RCInput over UDP in HAL_Linux - improved EKF startup checks for GPS accuracy - added raw IMU logging for all platforms - added BRD_CAN_ENABLE parameter - support FlightGear visualisation in SITL - configurable RGB LED brightness - added RTL_RADIUS parameter - improvements to the OVERRIDE_CHAN handling, fixing a race condition - added OVERRIDE_SAFETY parameter Many thanks to everyone who contributed to this release! The development team is growing at a fast pace, with 57 people contributing changes over this release cycle. I'd like to make special mention of Tom Pittenger and Michael du Breuil who have been doing extensive testing of the plane development code, and also contributing a great deal of their own improvements. Thanks! Release 3.4.0, 24th September 2015 ---------------------------------- The ArduPilot development team is proud to announce the release of version 3.4.0 of APM:Plane. This is a major release with a lot of changes so please read the notes carefully! First release with EKF by default This is the also the first release that enables the EKF (Extended Kalman Filter) for attitude and position estimation by default. This has been in development for a long time, and significantly improves flight performance. You can still disable the EKF if you want to using the AHRS_EKF_USE parameter, but it is strongly recommended that you use the EKF. Note that if an issue is discovered with the EKF in flight it will automatically be disabled and the older DCM system will be used instead. That should be very rare. In order to use the EKF we need to be a bit more careful about the setup of the aircraft. That is why in the last release we enabled arming and pre-arm checks by default. Please don't disable the arming checks, they are there for very good reasons. Last release with APM1/APM2 support This will be the last major release that supports the old APM1/APM2 AVR based boards. We have finally run out of flash space and memory. In the last few releases we spent quite a bit of time trying to squeeze more and more into the small flash space of the APM1/APM2, but it had to end someday if ArduPilot is to continue to develop. I am open to the idea of someone else volunteering to keep doing development of APM1/APM2 so if you have the skills and inclination do please get in touch. Otherwise I will only do small point release changes for major bugs. Even to get this release onto the APM1/APM2 we had to make sacrifices in terms of functionality. The APM1/APM2 release is missing quite a few features that are on the Pixhawk and other boards. For example: - no rangefinder support for landing - no terrain following - no EKF support - no camera control - no CLI support - no advanced failsafe support - no HIL support (sorry!) - support for far fewer GPS types that is just the most obvious major features that are missing on APM1/APM2. There are also numerous other smaller things where we need to take shortcuts on the APM1/APM2. Some of these features were available on older APM1/APM2 releases but needed to be removed to allow us to squeeze the new release onto the board. So if you are happy with a previous release on your APM2 and want a feature that is in that older release and not in this one then perhaps you shouldn't upgrade. PID Tuning While most people are happy with autotune to tune the PIDs for their planes, it is nice also to be able to do fine tuning by hand. This release includes new dataflash and mavlink messages to help with that tuning. You can now see the individual contributions of the P, I and D components of each PID in the logs, allowing you to get a much better picture of the performance. A simple application of this new tuning is you can easily see if your trim is off. If the Pitch I term is constantly contributing a signifcant positive factor then you know that ArduPilot is having to constantly apply up elevator, which means your plane is nose heavy. The same goes for roll, and can also be used to help tune your ground steering. Vibration Logging This release includes a lot more options for diagnosing vibration issues. You will notice new VIBRATION messages in MAVLink and VIBE messages in the dataflash logs. Those give you a good idea of your (unfiltered) vibration levels. For really detailed analysis you can setup your LOG_BITMASK to include raw logging, which gives you every accel and gyro sample on your Pixhawk. You can then do a FFT on the result and plot the distribution of vibration level with frequency. That is great for finding the cause of vibration issues. Note that you need a very fast microSD card for that to work! Rudder Disarm This is the first release that allows you to disarm using the rudder if you want to. It isn't enabled by default (due to the slight risk of accidentially disarming while doing aerobatics). You can enable it with the ARMING_RUDDER parameter by setting it to 2. It will only allow you to disarm if the autopilot thinks you are not flying at the time (thanks to the "is_flying" heuristics from Tom Pittenger). More Sensors This release includes support for a bunch more sensors. It now supports 3 different interfaces for the LightWare range of Lidars (serial, I2C and analog), and also supports the very nice Septentrio RTK dual-frequency GPS (the first dual-frequency GPS we have support for). It also supports the new "blue label" Lidar from Pulsed Light (both on I2C and PWM). For the uBlox GPS, we now have a lot more configurability of the driver, with the ability to set the GNSS mode for different constellations. Also in the uBlox driver we support logging of the raw carrier phase and pseudo range data, which allows for post-flight RTK analysis with raw-capable receivers for really accurate photo missions. Better Linux support This release includes a lot of improvements to the Linux based autopilot boards, including the NavIO+, the PXF and ERLE boards and the BBBMini and the new RasPilot board. If you like the idea of flying with Linux then please try it out! On-board compass calibrator We also have a new on-board compass calibrator, which also adds calibration for soft iron effects, allowing for much more accurate compass calibration. Support for starting the compass calibration in the various ground stations is still under development, but it looks like this will be a big improvement to compass calibration. Lots of other changes! The above list is just a taste of the changes that have gone into this release. Thousands of small changes have gone into this release with dozens of people contributing. Many thanks to everyone who helped! Other key changes include: - fixed return point on geofence breach - enable messages for MAVLink gimbal support - use 64 bit timestamps in dataflash logs - added realtime PID tuning messages and PID logging - fixed a failure case for the px4 failsafe mixer - added DSM binding support on Pixhawk - added ALTITUDE_WAIT mission command - added vibration level logging - ignore low voltage failsafe while disarmed - added delta velocity and delta angle logging - fix LOITER_TO_ALT to verify headings towards waypoints within the loiter radius - allow rudder disarm based on ARMING_RUDDER parameter - fix default behaviour of flaps - prevent mode switch changes changing WP tracking - make TRAINING mode obey stall prevention roll limits - disable TRIM_RC_AT_START by default - fixed parameter documentation spelling errors - send MISSION_ITEM_REACHED messages on waypoint completion - fixed airspeed handling in SITL simulators - enable EKF by default on plane - Improve gyro bias learning rate for plane and rover - Allow switching primary GPS instance with 1 sat difference - added NSH over MAVLink support - added support for mpu9250 on pixhawk and pixhawk2 - Add support for logging ublox RXM-RAWX messages - lots of updates to improve support for Linux based boards - added ORGN message in dataflash - added support for new "blue label" Lidar - switched to real hdop in uBlox driver - improved auto-config of uBlox - raise accel discrepancy arming threshold to 0.75 - improved support for tcp and udp connections on Linux - switched to delta-velocity and delta-angles in DCM - improved detection of which accel to use in EKF - improved auto-detections of flow control on pixhawk UARTs - Failsafe actions are not executed if already on final approach or land. - Option to trigger GCS failsafe only in AUTO mode. - added climb/descend parameter to CONTINUE_AND_CHANGE_ALT - added HDOP to uavcan GPS driver - improved sending of autopilot version - prevent motor startup with bad throttle trim on reboot - log zero rangefinder distance when unhealthy - added PRU firmware files for BeagleBoneBlack port - fix for recent STORM32 gimbal support - changed sending of STATUSTEXT severity to use correct values - added new RSSI library with PWM input support - fixed MAVLink heading report for UAVCAN GPS - support LightWare I2C rangefinder on Linux - improved staging of parameters and formats on startup to dataflash - added new on-board compass calibrator - improved RCOutput code for NavIO port - added support for Septentrio GPS receiver - support DO_MOUNT_CONTROl via command-long interface - added CAM_RELAY_ON parameter - moved SKIP_GYRO_CAL functionality to INS_GYR_CAL - added detection of bad lidar settings for landing Note that the documentation hasn't yet caught up with all the changes in this release. We are still working on that, but meanwhile if you see a feature that interests you and it isn't documented yet then please ask. Release 3.3.0, 20th May 2015 ---------------------------- The ardupilot development team is proud to announce the release of version 3.3.0 of APM:Plane. This is a major release with a lot of changes. Please read the release notes carefully! The last stable release was 3 months ago, and since that time we have applied over 1200 changes to the code. It has been a period of very rapid development for ArduPilot. Explaining all of the changes that have been made would take far too long, so I've chosen some key changes to explain in detail, and listed the most important secondary changes in a short form. Please ask for details if there is a change you see listed that you want some more information on. Arming Changes -------------- This is the first release of APM:Plane where ARMING_CHECK and ARMING_REQUIRE both default to enabled. That means when you upgrade if you didn't previously have arming enabled you will need to learn about arming your plane. Please see this page for more information on arming: http://plane.ardupilot.com/wiki/arming-your-plane/ I know many users will be tempted to disable the arming checks, but please don't do that without careful thought. The arming checks are an important part of ensuring the aircraft is ready to fly, and a common cause of flight problems is to takeoff before ArduPilot is ready. Re-do Accelerometer Calibration ------------------------------- Due to a change in the maximum accelerometer range on the Pixhawk all users must re-do their accelerometer calibration for this release. If you don't then your plane will fail to arm with a message saying that you have not calibrated the accelerometers. Only 3D accel calibration ------------------------- The old "1D" accelerometer calibration method has now been removed, so you must use the 3D accelerometer calibration method. The old method was removed because a significant number of users had poor flights due to scaling and offset errors on their accelerometers when they used the 1D method. My apologies for people with very large aircraft who find the 3D method difficult. Note that you can do the accelerometer calibration with the autopilot outside the aircraft which can make things easier for large aircraft. Auto-disarm ----------- After an auto-landing the autopilot will now by default disarm after LAND_DISARMDELAY seconds (with a default of 20 seconds). This feature is to prevent the motor from spinning up unexpectedly on the ground after a landing. HIL_MODE parameter ------------------ It is now possible to configure your autopilot for hardware in the loop simulation without loading a special firmware. Just set the parameter HIL_MODE to 1 and this will enable HIL for any autopilot. This is designed to make it easier for users to try HIL without having to find a HIL firmware. SITL on Windows --------------- The SITL software in the loop simulation system has been completely rewritten for this release. A major change is to make it possible to run SITL on native windows without needing a Linux virtual machine. There should be a release of MissionPlanner for Windows soon which will make it easy to launch a SITL instance. The SITL changes also include new backends, including the CRRCSim flight simulator. This gives us a much wider range of aircraft we can use for SITL. See http://dev.ardupilot.com/wiki/simulation-2/ for more information. Throttle control on takeoff --------------------------- A number of users had problems with pitch control on auto-takeoff, and with the aircraft exceeding its target speed during takeoff. The auto-takeoff code has now been changed to use the normal TECS throttle control which should solve this problem. Rudder only support ------------------- There is a new RUDDER_ONLY parameter for aircraft without ailerons, where roll is controlled by the rudder. Please see the documentation for more information on flying with a rudder only aircraft: http://plane.ardupilot.com/wiki/arduplane-parameters/#rudder_only_aircraft_arduplanerudder_only APM1/APM2 Support ----------------- We have managed to keep support for the APM1 and APM2 in this release, but in order to fit it in the limited flash space we had to disable some more features when building for those boards. For this release the AP_Mount code for controlling camera mounts is disabled on APM1/APM2. At some point soon it will become impractical to keep supporting the APM1/APM2 for planes. Please consider moving to a 32 bit autopilot soon if you are still using an APM1 or APM2. New INS code ------------ There have been a lot of changes to the gyro and accelerometer handling for this release. The accelerometer range on the Pixhawk has been changed to 16g from 8g to prevent clipping on high vibration aircraft, and the sampling rate on the lsm303d has been increased to 1600Hz. An important bug has also been fixed which caused aliasing in the sampling process from the accelerometers. That bug could cause attitude errors in high vibration environments. Numerous Landing Changes ------------------------ Once again there have been a lot of improvements to the automatic landing support. Perhaps most important is the introduction of a smooth transition from landing approach to the flare, which reduces the tendency to pitch up too much on flare. There is also a new parameter TECS_LAND_PMAX which controls the maximum pitch during landing. This defaults to 10 degrees, but for many aircraft a smaller value may be appropriate. Reduce it to 5 degrees if you find you still get too much pitch up during the flare. Other secondary changes in this release include: - a new SerialManager library which gives much more flexible management of serial port assignment - changed the default FS_LONG_TIMEOUT to 5 seconds - raised default IMAX for roll/pitch to 3000 - lowered default L1 navigation period to 20 - new BRD_SBUS_OUT parameter to enable SBUS output on Pixhawk - large improvements to the internals of PX4Firmware/PX4NuttX for better performance - auto-formatting of microSD cards if they can't be mounted on boot (PX4/Pixhawk only) - a new PWM based driver for the PulsedLight Lidar to avoid issues with the I2C interface - fixed throttle forcing to zero when disarmed - only reset mission on disarm if not in AUTO mode - much better handling of steep landings - added smooth transition in landing flare - added HIL_MODE parameter for HIL without a special firmware - lowered default FS_LONG_TIMEOUT to 5 seconds - mark old ELEVON_MIXING mode as deprecated - fixed 50Hz MAVLink support - support DO_SET_HOME MAVLink command - fixed larger values of TKOFF_THR_DELAY - allow PulsedLight Lidar to be disabled at a given height - fixed bungee launch (long throttle delay) - fixed a bug handling entering AUTO mode before we have GPS lock - added CLI_ENABLED parameter - removed 1D accel calibration - added EKF_STATUS_REPORT MAVLink message - added INITIAL_MODE parameter - added TRIM_RC_AT_START parameter - added auto-disarm after landing (LAND_DISARMDELAY) - added LOCAL_POSITION_NED MAVLink message - avoid triggering a fence breach in final stage of landing - rebuild glide slope if we are above it and climbing - use TECS to control throttle on takeoff - added RUDDER_ONLY parameter to better support planes with no ailerons - updated Piksi RTK GPS driver - improved support for GPS data injection (for Piksi RTK GPS) - added NAV_LOITER_TO_ALT mission item - fixed landing approach without an airspeed sensor - support RTL_AUTOLAND=2 for landing without coming to home first - disabled camera mount support on APM1/APM2 - added support for SToRM32 and Alexmos camera gimbals - added support for Jaimes mavlink enabled gimbal - improved EKF default tuning for planes - updated support for NavIO and NavIO+ boards - updated support for VRBrain boards - fixes for realtime threads on Linux - added simulated sensor lag for baro and mag in SITL - made it possible to build SITL for native Windows - switched to faster accel sampling on Pixhawk - added coning corrections on Pixhawk - set ARMING_CHECK to 1 by default - disable NMEA and SiRF GPS on APM1/APM2 - support MPU9255 IMU on Linux - updates to BBBMINI port for Linux - added TECS_LAND_PMAX parameter - switched to synthetic clock in SITL - support CRRCSim FDM backend in SITL - new general purpose replay parsing code - switched to 16g accel range in Pixhawk - added FENCE_AUTOENABLE=2 for disabling just fence floor - added POS dataflash log message - changed GUIDED behaviour to match copter - added support for a 4th MAVLink channel - support setting AHRS_TRIM in preflight calibration - fixed a PX4 mixer out of range error Best wishes to all APM:Plane users from the dev team, and happy flying! Release 3.2.2, February 10th 2015 --------------------------------- The ardupilot development team has released version 3.2.2 of APM:Plane. This is a bugfix release for some important bugs found by users of the 3.2.1 release. The changes in this release are: - fixed a bug that could cause short term loss of RC control with some receiver systems and configurations - allowed for shorter sync pulse widths for PPM-SUM receivers on APM1 and APM2 - fixed HIL mode altitude The most important bug fix is the one for short term loss of RC control. This is a very long standing bug which didn't have a noticeable impact for most people, but could cause loss of RC control for around 1 or 2 seconds for some people in certain circumstances. The bug was in the the AP_HAL RCInput API. Each HAL backend has a flag that says whether there is a new RC input frame available. That flag was cleared by the read() method (typically hal.rcin->read()). Callers would check for new input by checking the boolean hal.rcin->new_input() function. The problem was that read() was called from multiple places. Normally this is fine as reads from other than the main radio input loop happen before the other reads, but if the timing of the new radio frame exactly matched the loop frequency then a read from another place could clear the new_input flag and we would not see the new RC input frame. If that happened enough times we would go into a short term RC failsafe and ignore RC inputs, even in manual mode. The fix was very simple - it is the new_input() function itself that should clear the flag, not read(). Many thanks to MarkM for helping us track down this bug by providing us with sufficient detail on how to reproduce it. In Marks case his OpenLRSng configuration happened to produce exactly the worst case timing needed to reproduce the issue. Once I copied his OpenLRS settings to my TX/RX I was able to reproduce the problem and it was easy to find and fix. A number of users have reported occasional glitches in manual control where servos pause for short periods in past releases. It is likely that some of those issues were caused by this bug. The dev team would like to apologise for taking so long to track down this bug! The other main change was also related to RC input. Some receivers use a PPM-SUM sync pulse width shorter than what the APM1/APM2 code was setup to handle. The OpenLRSng default sync pulse width is 3000 microseconds, but the APM1/APM2 code was written for a mininum sync pulse width of 4000 microseconds. For this release I have changed the APM1/APM2 driver to accept a sync pulse width down to 2700 microseconds. Release 3.2.1, February 5th 2015 -------------------------------- The ardupilot development team is proud to announce the release of version 3.2.1 of APM:Plane. This is primarily a bugfix release, but does have some new features. The major changes in this release are: - fixed a mission handling bug that could cause a crash if jump commands form an infinite loop (thanks to Dellarb for reporting this bug) - improved support for in-kernel SPI handling on Linux (thanks to John Williams) - support UAVCAN based ESCs and GPS modules on Pixhawk (thanks to Pavel, Holger and and PX4 dev team) - Multiple updates for the NavIO+ cape on RaspberryPi (thanks to Emlid) - multiple automatic landing fixes, including improvements in flare detection, glide slope calculation and lag handling - fixed a bug that could cause a change altitude MAVLink command from causing a sudden descent - re-enable CLI on non-APM1/APM2 boards - Lots of EKF changes, including reducing impact of ground magnetic interference, reducing the impact of a GPS outage and integrating optical flow support - added initial support for the PX4 optical flow sensor. Just logging for this release. - added support for MAVLink packet routing - added detection and recovery from faulty gyro and accel sensors - improved arming checks code to detect a lot more error conditions, and change the ARMING_CHECK default value to check all error conditions. - added support for BBBMini Linux port - increased number of AVR input channels from 8 to 11 - auto-set system clock based on GPS in Linux ports - added SBUS FrSky telemetry support (thanks to Mathias) Release 3.2.0, November 25th 2014 --------------------------------- The ardupilot development team is proud to announce the release of version 3.2.0 of APM:Plane. This is a major release with a lot of new features. The changes span a lot of different areas of the code, but arguably the most important changes are: - automatic stall prevention code - PX4IO based RC override code on FMU failure - I2C crash bugfix - new autoland code from Michael Day - compass independent auto takeoff I'll go into each of these changes in a bit more detail. Automatic Stall Prevention -------------------------- The automatic stall prevention code is code that uses the aerodynamic load factor (calculated from demanded bank angle) to adjust both the maximum roll angle and the minimum airspeed. You can enable/disable this code with the STALL_PREVENTION parameter which defaults to enabled. When in stabilised manual throttle modes this option has the effect of limiting how much bank angle you can demand when close to the configured minimum airspeed (from ARSPD_FBW_MIN). That means when in FBWA mode if you try to turn hard while close to ARSPD_FBW_MIN it will limit the bank angle to an amount that will keep the speed above ARSPD_FBW_MIN times the aerodynamic load factor. It will always allow you at bank at least 25 degrees however, to ensure you keep some maneuverability if the airspeed estimate is incorrect. When in auto-throttle modes (such as AUTO, RTL, CRUISE etc) it will additionally raise the minimum airspeed in proportion to the aerodynamic load factor. That means if a mission demands a sharp turn at low speed then initially the turn will be less sharp, and the TECS controller will add power to bring the airspeed up to a level that can handle the demanded turn. After the turn is complete the minimum airspeed will drop back to the normal level. This change won't completely eliminate stalls of course, but it should make them less likely if you properly configure ARSPD_FBW_MIN for your aircraft. PX4IO based RC override code ---------------------------- This releases adds support for PX4IO based RC override. This is a safety feature where the stm32 IO co-processor on the PX4 and Pixhawk will give the pilot manual control if the main ArduPilot micro-controller fails (or the autopilot code crashes). This is particularly useful when testing new code that may not be stable. As part of this new RC override support we also have a new OVERRIDE_CHAN parameter, which allows you to specify a RC input channel which can be used to test the RC override support. See the documentation on OVERRIDE_CHAN for details. I2C bugfix ---------- This release fixes another I2C bug in NuttX which could cause the Pixhawk to lock up under high I2C load with noise on I2C cables. This bug has caused at least two aircraft to crash, so it is an important fix. I hope this will be the last I2C crash bug we find in NuttX! An audit of the code was done to try to confirm that no more bugs of this type are present. New Autoland code ----------------- This release incorporates some new autoland capabilities contributed by Michael Day. The key new feature is the ability to trigger an automatic landing when a RTL completes, which for the first time allows a user to setup their aircraft to land using only transmitter control. The way it works is there is a new parameter RTL_AUTOLAND. If that is set to 1 and the aircraft reaches its target location in an RTL it will look for DO_LAND_START mission item in the mission. If that is found then the aircraft will switch to AUTO starting at that section of the mission. The user sets up their land mission commands starting with a DO_LAND_START mission item. There is more to do in this autoland support. We have been discussing more advanced go-around capabilities and also better path planning for landing. The code in this release is an important first step though, and will be a good basis for future work. Compass independent takeoff code -------------------------------- The auto-takeoff code has been changed to make it more independent of compass settings, allowing for reliable takeoff down a runway with poor compass offsets. The new takeoff code uses the gyroscope as the primary heading control for the first part of the takeoff, until the aircraft gains enough speed for a GPS heading to be reliable. Many thanks to all the contributors, especially: - Paul and Jon for EKF and TECS updates - Bret and Grant for stall prevention testing - Michael for all his autoland work - all the work on NavIO, PXF and Zynq by John, Victor, George and Siddarth - The PX4 team for all the PX4 updates More complete list of changes: - allow GCS to enable/disable PX4 safety switch - make auto-takeoff independent of compass errors - report gyro unhealthy if calibration failed - added support for MAV_CMD_DO_LAND_START - added RTL_AUTOLAND parameter - disable CLI by default in build - new InertialSensor implementation - added landing go around support - enable PX4 failsafe RC override - added OVERRIDE_CHAN parameter - changed default AUTOTUNE level to 6 - changed default I value for roll/pitch controllers - added CAMERA_FEEDBACK mavlink messages - use airspeed temperature for baro calibration if possible - added STALL_PREVENTION parameter - fixed handling of TKOFF_THR_MAX parameter - added ARSPD_SKIP_CAL parameter - fixed flaperon trim handling (WARNING: may need to retrim flaperons) - EKF robustness improvements, especially for MAG handling - lots of HAL_Linux updates - support wider range of I2C Lidars - fixed fallback to DCM in AHRS - fixed I2C crash bug in NuttX - TECS prevent throttle undershoot after a climb - AP_Mount: added lead filter to improve servo gimbals - Zynq and NavIO updates - fixed preflight calibration to prevent losing 3D accel cal - perform a gyro calibration when doing 3D accel cal - added DO_CONTINUE_AND_CHANGE_ALT mission command - added support for DO_FENCE_ENABLE mission command - allow gyro calibration to take up to 30 seconds - improved health checks in the EKF for DCM fallback Note: If you use flaperons you may need to re-trim them before you fly due to the change in flaperon trim handling. I hope that everyone enjoys flying this new APM:Plane release as much as we enjoyed producing it! It is a major milestone in the development of the fixed wing code for APM, and I think puts us in a great position for future development. Happy flying! Release 3.1.1, September 12th 2014 ---------------------------------- The ardupilot development team is proud to announce the release of version 3.1.1 of APM:Plane. This is primarily a bugfix release with a small number of new features. The main bug fixed in this release is a bug that could affect saving parameters and mission items in the FRAM/eeprom storage of PX4v1/Pixhawk/VRBrain. The bug has been in the code since January 2013 and did not cause problems very often (which is why it hasn't been noticed till now), but when it does happen it causes changes to parameters or mission items not to be saved on a reboot. Other changes in this release: - support for using a Lidar for landing for terrain altitude (see the RNGFND_LANDING parameter) - improvements in the landing approach code, especially the glide slope calculation - added LAND_FLAP_PERCENT and TKOFF_FLAP_PCNT parameters, to control the amount of flaps to use on takeoff and landing - the default WP_RADIUS has been raised from 30 to 90. Note that the L1 controller may choose to turn after the WP_RADIUS is reached. The WP_RADIUS only controls the earliest point at which the turn can happen, so a larger WP_RADIUS usually leads to better flight paths, especially for faster aircraft. - send gyro and accel status separately to the GCS (thanks to Randy) - support setting the acceptance radius in mission waypoints (in parameter 2), which allows for better control of waypoints where actions such as servo release will happen - fixed GPS time offset in HIL - added RELAY_DEFAULT parameter, allowing control of relay state on boot - fixed sdcard logging on PX4v1 - added GPS_SBAS_MODE and GPS_MIN_ELEV parameters for better control of the use of SBAS and the GPS elevation mask for advanced users Happy flying! Release 3.1.0, August 26th 2014 ------------------------------- The ardupilot development team is proud to announce the release of version 3.1.0 of APM:Plane. This is a major release with a lot of new features and bug fixes. The biggest change in this release is the addition of automatic terrain following. Terrain following allows the autopilot to guide the aircraft over varying terrain at a constant height above the ground using an on-board terrain database. Changes in this release: - added terrain following support. See http://plane.ardupilot.com/wiki/common-terrain-following/ - added support for higher baudrates on telemetry ports, to make it easier to use high rate telemetry to companion boards. Rates of up to 1.5MBit are now supported to companion boards. - added new takeoff code, including new parameters: TKOFF_TDRAG_ELEV, TKOFF_TDRAG_SPD1, TKOFF_ROTATE_SPD, TKOFF_THR_SLEW and TKOFF_THR_MAX. This gives fine grained control of auto takeoff for tail dragger aircraft. - overhauled glide slope code to fix glide slope handling in many situations. This makes transitions between different altitudes much smoother. - prevent early waypoint completion for straight ahead waypoints. This makes for more accurate servo release at specific locations, for applications such as dropping water bottles. - added MAV_CMD_DO_INVERTED_FLIGHT command in missions, to change from normal to inverted flight in AUTO (thanks to Philip Rowse for testing of this feature). - new Rangefinder code with support for a wider range of rangefinder types including a range of Lidars (thanks to Allyson Kreft) - added support for FrSky telemetry via SERIAL2_PROTOCOL parameter (thanks to Matthias Badaire) - added new STAB_PITCH_DOWN parameter to improve low throttle behaviour in FBWA mode, making a stall less likely in FBWA mode (thanks to Jack Pittar for the idea). - added GLIDE_SLOPE_MIN parameter for better handling of small altitude deviations in AUTO. This makes for more accurate altitude tracking in AUTO. - added support for Linux based autopilots, initially with the PXF BeagleBoneBlack cape and the Erle robotics board. Support for more boards is expected in future releases. Thanks to Victor, Sid and Anuj for their great work on the Linux port. See http://diydrones.com/profiles/blogs/first-flight-of-ardupilot-on-linux for details. - prevent cross-tracking on some waypoint types, such as when initially entering AUTO or when the user commands a change of target waypoint. - fixed servo demo on startup (thanks to Klrill-ka) - added AFS (Advanced Failsafe) support on 32 bit boards by default. See http://plane.ardupilot.com/wiki/advanced-failsafe-configuration/ - added support for monitoring voltage of a 2nd battery via BATTERY2 MAVLink message - added airspeed sensor support in HIL - fixed HIL on APM2. HIL should now work again on all boards. - added StorageManager library, which expands available FRAM storage on Pixhawk to 16 kByte. This allows for 724 waypoints, 50 rally points and 84 fence points on Pixhawk. - improved steering on landing, so the plane is actively steered right through the landing. - improved reporting of magnetometer and barometer errors to the GCS - added FBWA_TDRAG_CHAN parameter, for easier FBWA takeoffs of tail draggers, and better testing of steering tuning for auto takeoff. - fixed failsafe pass through with no RC input (thanks to Klrill-ka) - fixed a bug in automatic flow control detection for serial ports in Pixhawk - fixed use of FMU servo pins as digital inputs on Pixhawk - imported latest updates for VRBrain boards (thanks to Emile Castelnuovo and Luca Micheletti) - updates to the Piksi GPS support (thanks to Niels Joubert) - improved gyro estimate in DCM (thanks to Jon Challinger) - improved position projection in DCM in wind (thanks to Przemek Lekston) - several updates to AP_NavEKF for more robust handling of errors (thanks to Paul Riseborough) - improved simulation of rangefinders in SITL - lots of small code cleanups thanks to Daniel Frenzel - initial support for NavIO board from Mikhail Avkhimenia - fixed logging of RCOU for up to 12 channels (thanks to Emile Castelnuovo) - code cleanups from Silvia Nunezrivero - improved parameter download speed on radio links with no flow control Many thanks to everyone who contributed to this release, especially our beta testers Marco, Paul, Philip and Iam. Happy flying! Release 3.0.3, May 19th 2014 ---------------------------- The ardupilot development team is proud to announce the release of version 3.0.3 of APM:Plane. This release contains some important bug fixes for all supported boards. The key bug fixes in this release are: - fixed handling of filter divergance in the EKF filter - fixed a glide slope calculation bug when entering AUTO mode The EKF fixes are the main focus of this release. During testing of APM:Plane with the AHRS_EKF_USE enabled it was found that under some circumstances the EKF could diverge, resulting in loss of attitude estimate. Unless the pilot quickly took control in MANUAL this could result in the aircraft crashing. The fix for this problem was in several parts. The main fix was to prevent the divergance, but as a precuation against future bugs of this type additional numerical checks were added to allow the EKF to automatically reset in flight when the internal state shows large gyro bias changes, which are the first sign of something going wrong in the filter. If this happens again the EKF will automatically disable itself for 10 seconds, allowing APM:Plane to fall back to the old DCM code. The EKF will then reset itself using initial state based on the DCM state. The aircraft will report the failure using the AHRS health bit in the SYS_STATUS MAVLink message. The default EKF tuning parameters were also updated based on a number of user supplied flight logs to increase the robustness of the filter. The second bug fixed in this release relates to the glide slope calculation when the aircraft enters AUTO mode for the first time when at an altitude above the altitude of the first waypoint in the mission. The starting point for the glide slope was incorrectly calculated using the home altitude, which resulted in the aircraft descending below the first waypoint altitude before climbing again. In some circumstances this could lead to a crash due to local terrain. Many thanks to everyone who tested this release. Special thanks to Dellarb for reporting the glide slope bug and to Paul Riseborough for all his work on the EKF code over the last few weeks. Happy flying! Release 3.0.2, May 4th 2014 --------------------------- The ardupilot development team is proud to announce the release of version 3.0.2 of APM:Plane. This release combines some important bug fixes with some new features. I2C bug fix ----------- The most important change for this release is a bug fix for an I2C bug in the NuttX I2C driver code that could (under some rare circumstances) cause a Pixhawk to crash. This bug fix is the primary reason for doing a new release now. This bug was able to be reproduced by creating a 1.3m GPS cable carrying both the I2C signals for a magnetometer and the UART signals for the GPS. Interference between these two signals could cause the I2C controller to give spurious data to the I2C driver. The I2C driver did not have sufficient protection against these errors and could crash the board. While we have not been able to reproduce this error with the normal cables that come with a Pixhawk we cannot rule out the bug triggering with shorter cables, so we are doing a fast release to fix the bug. Autotune -------- This release also includes an important new feature - automatic roll/pitch tuning. While this feature is still considered experimental we have had very positive feedback from beta testers and have decided to include it in the release. Full documentation for how to use automatic tuning is available here: http://plane.ardupilot.com/wiki/automatic-tuning-with-autotune/ we hope that the automatic tuning will help users who have had difficulty with the standard APM:Plane manual tuning procedure. We plan on extending autotune to other aspects of fixed wing tuning in future releases. Other changes ------------- - fixed a glide slope calculation error when very close to waypoints - fixed a bug when swithing to another auto-throttle mode during auto takeoff (thanks to Marco for finding this bug!) - added MIS_AUTORESET parameter (thanks to Andrew Chapman) - support compassmot calibration by supplying current measurments to the compass driver (thanks to Jon Challinger) - fixed a GPS driver bug that could cause GPS lag in case of lost GPS samples (thanks to Jon Challinger) - fixed a LOITER_TURNS bug in missions for counter-clockwise loiter (thanks to Iskess for finding this bug) - added support for OBC termination requirements to PX4IO - added support for pressure altitude termination to OBC module - fixed EKF wind estimation with no airspeed sensor (thanks to Paul Riseborough) - improved tuning of EKF for fixed wing aircraft (thanks to Paul Riseborough) - Converted rally point code to library AP_Rally (thanks to Andrew Chapman) - added SITL checking for numerical errors Thanks to testers! Many thanks to everyone who tested the beta versions of this release! Special thanks to Marco, Paul, Jon, Iam, JNJO, sonicdahousecat and Keeyen for providing testing of both existing features and the new autotune code. Release 3.0.1, April 9th 2014 ----------------------------- I've just released APM:Plane 3.0.1, a bug fix release for the 3.0.0 release. This release fixes two bugs: throttle failsafe for aircraft using PWM level for failsafe detection wind reporting with EKF enabled and no airspeed sensor The throttle failsafe fix is a critical bugfix, which is why I am doing a new release so soon. The bug was found by Sam Tabor, and he posted the bug report before the 3.0.0 release, but I didn't notice it in the release preparations. The bug only affects systems using PWM value as the sole method of detecting loss of RC control. I hadn't noticed it myself as my planes all use receivers which stop sending value PWM frames when the RC link is lost. In that case failsafe worked correctly. Receivers that keep sending PWM frames but with low throttle levels are common though, so this is a very important fix. Many thanks to Sam for reporting the bug, and my apologies for not noticing it in time for the 3.0.0 release. Release 3.0.0, April 8th 2014 ----------------------------- The ardupilot development team is proud to announce the release of version 3.0.0 of APM:Plane. This is a major release with a lot of new features. For each release I try to highlight the two or 3 key new features that have gone in since the last release. That is a more difficult task this time around because there are just so many new things. Still, I think the most important ones are the new Extended Kalman Filter (EKF) for attitude/position estimation, the extensive dual sensors support and the new AP_Mission library. We have also managed to still keep support for the APM1 and APM2, although quite a few of the new features are not available on those boards. We don't yet know for how long we'll be able to keep going on supporting these old boards, so if you are thinking of getting a new board then you should get a Pixhawk, and if you want the best performance from the APM:Plane code then you should swap to a Pixhawk now. It really is a big improvement. New Extended Kalman Filter -------------------------- The biggest change for the 3.0.0 release (and in fact the major reason why we are calling it 3.0.0) is the new Extended Kalman Filter from Paul Riseborough. Using an EKF for attitude and position estimation was never an option on the APM2 as it didn't have the CPU power or memory to handle it. The Pixhawk does have plenty of floating point performance, and Paul has done a fantastic job of taking full advantage of the faster board. As this is the first stable release with the EKF code we have decided to not enable it by default. It does however run all the time in parallel with the existing DCM code, and both attitude/position solutions are logged both to the on-board SD card and over MAVLink. You can enable the EKF code using the parameter AHRS_EKF_USE=1, which can be set and unset while flying, allowing you to experiment with using the EKF either by examining your logs with the EKF disabled to see how it would have done or by enabling it while flying. The main thing you will notice with the EKF enabled is more accurate attitude estimation and better handling of sensor glitches. A Kalman filter has an internal estimate of the reliability of each of its sensor inputs, and is able to weight them accordingly. This means that if your accelerometers start giving data that is inconsistent with your other sensors then it can cope in a much more graceful way than our old DCM code. The result is more accurate flying, particularly in turns. It also makes it possible to use higher tuning gains, as the increased accuracy of the attitude estimation means that you can push the airframe harder without it becoming unstable. You may find you can use a smaller value for NAVL1_PERIOD, giving tighter turns, and higher gains on your roll and pitch attitude controllers. Paul has written up a more technical description of the new EKF code here: http://plane.ardupilot.com/wiki/common-apm-navigation-extended-kalman-filter-overview/ Dual Sensors ------------ The second really big change for this release is support for dual-sensors. We now take full advantage of the dual accelerometers and dual gyros in the Pixhawk, and can use dual-GPS for GPS failover. We already had dual compass support, so the only main sensors we don't support two of now are the barometer and the airspeed sensor. I fully expect we will support dual baro and dual airspeed in a future release. You might wonder why dual sensors is useful, so let me give you an example. I fly a lot of nitro and petrol planes, and one of my planes (a BigStik 60) had a strange problem where it would be flying perfectly in AUTO mode, then when the throttle reached a very specific level the pitch solution would go crazy (sometimes off by 90 degrees). I managed to recover in MANUAL each time, but it certainly was exciting! A careful analysis of the logs showed that the culprit was accelerometer aliasing. At a very specific throttle level the Z accelerometer got a DC offset of 11 m/s/s. So when the plane was flying along nice and level the Z accelerometer would change from -10 m/s/s to +1 m/s/s. That resulted in massive errors in the attitude solution. This sort of error happens because of the way the accelerometer is sampled. In the APM code the MPU6000 (used on both the APM2 and Pixhawk) samples the acceleration at 1kHz. So if you have a strong vibrational mode that is right on 1kHz then you are sampling the "top of the sine wave", and get a DC offset. The normal way to fix this issue is to improve the physical anti-vibration mounting in the aircraft, but I don't like to fix problems like this by making changes to my aircraft, as if I fix my aircraft it does nothing for the thousands of other people running the same code. As the lead APM developer I instead like to fix things in software, so that everyone benefits. The solution was to take advantage of the fact that the Pixhawk has two accelerometers, one is a MPU6000, and the 2nd is a LSM303D. The LSM303D is sampled at 800Hz, whereas the MPU6000 is sampled at 1kHz. It would be extremely unusual to have a vibration mode with aliasing at both frequencies at once, which means that all we needed to do was work out which accelerometer is accurate at any point in time. For the DCM code that involved matching each accelerometer at each time step to the combination of the GPS velocity vector and current attitude, and for the EKF it was a matter of producing a weighting for the two accelerometers based on the covariance matrix. The result is that the plane flew perfectly with the new dual accelerometer code, automatically switching between accelerometers as aliasing occurred. Since adding that code I have been on the lookout for signs of aliasing in other logs that people send me, and it looks like it is more common than we expected. It is rarely so dramatic as seen on my BigStik, but often results in some pitch error in turns. I am hopeful that with a Pixhawk and the 3.0 release of APM:Plane that these types of problems will now be greatly reduced. For the dual gyro support we went with a much simpler solution and just average the two gyros when both are healthy. That reduces noise, and works well, but doesn't produce the dramatic improvements that the dual accelerometer code resulted in. Dual GPS was also quite a large development effort. We now support connecting a 2nd GPS to the serial4/5 port on the Pixhawk. This allows you to protect against GPS glitches, and has also allowed us to get a lot of logs showing that even with two identical GPS modules it is quite common for one of the GPS modules to get a significant error during a flight. The new code currently switches between the two GPS modules based on the lock status and number of satellites, but we are working on a more sophisticated switching mechanism. Supporting dual GPS has also made it easier to test new GPS modules. This has enabled us to do more direct comparisons between the Lea6 and the Neo7 for example, and found the Neo7 performs very well. It also helps with developing completely new GPS drivers, such as the Piksi driver (see notes below). New AP_Mission library ---------------------- Many months ago Brandon Jones re-worked our mission handling code to be a library, making it much cleaner and fixing a number of long term annoyances with the behaviour. For this release Randy built upon the work that Brandon did and created the new AP_Mission library. The main feature of this library from the point of view of the developers is that it has a much cleaner interface, but it also has some new user-visible features. The one that many users will be glad to hear is that it no longer needs a "dummy waypoint" after a jump. That was always an annoyance when creating complex missions. The real advantage of AP_Mission will come in future releases though, as it has the ability to look ahead in the mission to see what is coming, allowing for more sophisticated navigation. The copter code already takes advantage of this with the new spline waypoint feature, and we expect to take similar advantage of this in APM:Plane in future releases. New Piksi GPS driver -------------------- One of the most exciting things to happen in the world of GPS modules in the last couple of years is the announcement by SwiftNav that they would be producing a RTK capable GPS module called the Piksi at a price that (while certainly expensive!) is within reach of more dedicated hobbyists. It offers the possibility of decimeter and possibly even centimetre level relative positioning, which has a lot of potential for small aircraft, particularly for landing control and more precise aerial mapping. This release of APM:Plane has the first driver for the Piksi. The new driver is written by Niels Joubert, and he has done a great job. It is only a start though, as this is a single point positioning driver. It will allow you to use your new Piksi if you were part of the kickstarter, but it doesn't yet let you use it in RTK mode. Niels and the SwiftNav team are working on a full RTK driver which we hope will be in the next release. Support for more RC channels ---------------------------- This release is the first to allow use of more than 8 RC input channels. We now support up to 18 input channels on SBus on Pixhawk, with up to 14 of them able to be assigned to functions using the RCn_FUNCTION settings. For my own flying I now use a FrSky Taranis with X8R and X6R receivers and they work very nicely. Many thanks to the PX4 team, and especially to Holger and Lorenz for their great work on improving the SBus code. Flaperon Support ---------------- This release is the first to have integrated flaperon support, and also includes much improved flaps support in general. You can now set a FLAP_IN_CHANNEL parameter to give an RC channel for manual flap control, and setup a FLAPERON_OUTPUT to allow you to setup your ailerons for both manual and automatic flaperon control. We don't yet have a full wiki page on setting up flaperons, but you can read about the parameters here: http://plane.ardupilot.com/wiki/arduplane-parameters/#Flap_input_channel_ArduPlaneFLAP_IN_CHANNEL Geofence improvements --------------------- Michael Day has made an number of significant improvements to the geo-fencing support for this release. It is now possible to enable/disable the geofence via MAVLink, allowing ground stations to control the fence. There are also three new fence control parameters. One is FENCE_RET_RALLY which when enabled tells APM to fly back to the closest rally point on a fence breach, instead of flying to the center of the fence area. That can be very useful for more precise control of fence breach handling. The second new parameter is FENCE_AUTOENABLE, which allows you to automatically enable a geofence on takeoff, and disable when doing an automatic landing. That is very useful for fully automated missions. The third new geofence parameter is FENCE_RETALT, which allows you to specify a return altitude on fence breach. This can be used to override the default (half way between min and max fence altitude). Automatic Landing improvements ------------------------------ Michael has also been busy on the automatic landing code, with improvements to the TECS speed/height control when landing and new TECS_LAND_ARSPD and TECS_LAND_THR parameters to control airspeed and throttle when landing. This is much simpler to setup than DO_CHANGE_SPEED commands in a mission. Michael is also working on automatic path planning for landing, based on the rally points code. We hope that will get into a release soon. Detailed Pixhawk Power Logging ------------------------------ One of the most common causes of issues with autopilots is power handling, with poor power supplies leading to brownouts or sensor malfunction. For this release we have enabled detailed logging of the information available from the on-board power management system of the Pixhawk, allowing us to log the status of 3 different power sources (brick input, servo rail and USB) and log the voltage level of the servo rail separately from the 5v peripheral rail on the FMU. This new logging should make it much easier for us to diagnose power issues that users may run into. New SERIAL_CONTROL protocol --------------------------- This release adds a new SERIAL_CONTROL MAVLink message which makes it possible to remotely control a serial port on a Pixhawk from a ground station. This makes it possible to do things like upgrade the firmware on a 3DR radio without removing it from an aircraft, and will also make it possible to attach to and control a GPS without removing it from the plane. There is still work to be done in the ground station code to take full advantage of this new feature and we hope to provide documentation soon on how to use u-Blox uCenter to talk to and configure a GPS in an aircraft and to offer an easy 3DR radio upgrade button via the Pixhawk USB port. Lots of other changes! ---------------------- There have been a lot of other improvements in the code, but to stop this turning into a book instead of a set of release notes I'll stop the detailed description there. Instead here is a list of the more important changes not mentioned above: - added LOG_WHEN_DISARMED flag in LOG_BITMASK - raised default LIM_PITCH_MAX to 20 degrees - support a separate steering channel from the rudder channel - faster mission upload on USB - new mavlink API for reduced memory usage - fixes for the APM_OBC Outback Challenge module - fixed accelerometer launch detection with no airspeed sensor - greatly improved UART flow control on Pixhawk - added BRD_SAFETYENABLE option to auto-enable the safety switch on PX4 and Pixhawk on boot - fixed pitot tube ordering bug and added ARSPD_TUBE_ORDER parameter - fixed log corruption bug on PX4 and Pixhawk - fixed repeated log download bug on PX4 and Pixhawk - new Replay tool for detailed log replay and analysis - flymaple updates from Mike McCauley - fixed zero logs display in MAVLink log download - fixed norm_input for cruise mode attitude control - added RADIO_STATUS logging in aircraft logs - added UBX monitor messages for detailed hardware logging of u-Blox status - added MS4525 I2C airspeed sensor voltage compensation I hope that everyone enjoys flying this new APM:Plane release as much as we enjoyed producing it! It is a major milestone in the development of the fixed wing code for APM, and I think puts us in a great position for future development. Happy flying!