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295 Commits

Author SHA1 Message Date
Randy Mackay d291594d7c Compass: get_primary method made public 2014-07-22 22:01:09 +09:00
Randy Mackay 1f579563e6 Compass: set_motor_compensation takes instance as first parameter 
Also get_motor_compensation uses primary compass
 2014-07-22 21:59:04 +09:00
Randy Mackay 47801a6c4d Compass: bug fix to init of device id 
Also init members to reduce compiler warnings
 2014-07-16 14:29:10 +09:00
Markus Koetter 701aa9ac4c AP_Compass: DEVIOCGDEVICEID is (currently) not defined in VRNuttX 2014-07-15 11:42:37 +10:00
Andrew Tridgell 1e20f89f90 AP_Compass: use HAL_COMPASS_DEFAULT in example code 2014-07-14 09:44:36 +10:00
Randy Mackay bbf4805b0e Compass: update pixhawk expected device ids 2014-07-11 11:10:18 +09:00
Craig Elder c9f3adcb5c Compass: Updated COMPASS_PRIMARY parameter description 2014-07-10 15:32:06 -07:00
Craig Elder 0ecd12b1c6 AP_Compass: Corrected typo in parameter description 
Corrected typo in parameter description
 2014-07-10 14:19:19 -07:00
Randy Mackay 4995b9ada8 Compass: default device id to zero 2014-07-10 20:25:36 +09:00
Randy Mackay 16d4af8346 Compass: sanity check instance in set_and_save_offsets 2014-07-10 20:25:32 +09:00
Randy Mackay cf7e1a6339 Compass: example sketch update for set_and_save_offsets 2014-07-10 20:25:13 +09:00
Randy Mackay a778522cef Compass: add learn_offsets_enabled accessor method 2014-07-10 20:25:11 +09:00
Randy Mackay 108c878b04 Compass: set_offsets modified to also save offsets 2014-07-10 20:25:08 +09:00
Randy Mackay 124bd4b489 Compass: save_offsets accepts compass instance 2014-07-10 20:25:05 +09:00
Randy Mackay 070f1c1bbb Compass: add dev_id for VRBrain 2014-07-10 20:24:49 +09:00
Randy Mackay f42c9579d7 Compass: add dev_id for PX4 
dev_id is retrieved from PX4Firmware via ioctl call
 2014-07-10 20:24:46 +09:00
Randy Mackay b7f33d81ad Compass: add DEV_ID param and configured method 
These allow checking the offsets were created with the current compass
device.
 2014-07-10 20:24:44 +09:00
Andrew Tridgell c138244155 AP_Compass: support 3 mags on PX4 2014-07-04 12:07:47 +10:00
Emile Castelnuovo 8f3a4bc88b VRBRAIN: correction to AP_Compass_VRBRAIN.cpp 2014-06-19 11:27:45 +02:00
LukeMike 8f552d5758 VRBRAIN: Changed the management of VirtualRobotix's boards. 2014-06-19 11:27:38 +02:00
Andrew Tridgell e9e1799700 AP_Compass: fixed VRBrain build 2014-06-02 10:42:37 +10:00
Andrew Tridgell 2d9e9d9bc3 AP_Compass: added COMPASS_PRIMARY parameter 
this allows selection of which compass is the primary. Useful if the
first compass starts giving spurious data (as happened in our plane)
 2014-05-25 22:03:44 +10:00
Jonathan Challinger e883b889b6 SITL: Add compassmot interference 2014-05-15 21:14:20 +10:00
Kevin Hester b7bed437c2 Compass: fixup line endings 2014-04-15 15:56:57 +09:00
Emile Castelnuovo 1bc199c5bd AP_Compass: new files and definition for VRBRAIN board 2014-04-08 16:19:19 +10:00
Andrew Tridgell 485ae596fc AP_Compass: fixed last_update for secondary compass with primary failed 
this ensures EKF and DCM will use a secondary compass if the primary
fails
 2014-03-23 22:05:17 +11:00
Matthew Lloyd 60a4f74de6 AP_Compass: avoid division by zero if we haven't received any mag reports 
Otherwise, get_field() will return NaNs after once every few calls to
read() during compassmot on PX4 platforms, which causes compassmot to fail.

This is a quick hack around the deeper issue, which could be something
like the PX4 mag driver experiencing starvation and skipping mag reports,
buffer overrun or something else that causes mag reports to be dropped.
Or perhaps we should never expect in the first place that we will always
receive at least one mag report between calls to read().
 2014-03-23 21:22:32 +11:00
Andrew Tridgell db48ed9218 AP_Compass: fixed showing of is_external for 2nd compass 2014-03-13 16:26:43 +11:00
Andrew Tridgell cf148fa76c AP_Compass: improved COMPASS_ORIENT and COMPASS_EXTERNAL for Pixhawk 2014-02-27 12:46:27 +11:00
Andrew Tridgell 189d635493 AP_Compass: constrain compass offsets to +/- 2000 
this is prompted by a user log showing NaN compass offsets, resulting
in a crash. The patch ensures we never end up with NaN offsets, and
also constrains the offsets to a reasonable limit
 2014-02-16 13:33:41 +11:00
Andrew Tridgell 9bb8f73d56 Compass: split compass learning out to its own C++ file 2014-02-16 13:21:06 +11:00
Andrew Tridgell 54562b0b9a AP_Compass: prevent bad initial values from affecting HMC5883 calibration 
the first couple of values after we enter strap mode may be low, but
just above our 0.7 threshold. We now discard the first two values to
prevent these affecting the average.

Also added some commented out debug code and a comment on the scaling
of the calibration code
 2014-01-22 17:15:34 +11:00
Andrew Tridgell bc2d17e76e AP_Compass: added vector compass setHIL method 2013-12-30 14:35:24 +11:00
Andrew Tridgell c44d8b45ce AP_Compass: auto-select healthy compass 2013-12-09 20:01:42 +11:00
Andrew Tridgell 61f564d7c9 AP_Compass: support motor compensation for multiple compasses 
Pair-Programmed-With: Randy Mackay <rmackay9@yahoo.com>
 2013-12-09 19:45:31 +11:00
Andrew Tridgell 0a7a935f63 AP_Compass: fixup 2013-12-09 17:54:54 +11:00
Andrew Tridgell c538816825 AP_Compass: support compass health status on multiple compasses 2013-12-09 17:46:41 +11:00
Andrew Tridgell bde89fd4e2 AP_Compass: added compass offsets for 2nd compass 2013-12-09 17:34:07 +11:00
Andrew Tridgell 8a97042fb1 AP_Compass: updates to support multiple compasses 2013-12-09 17:34:07 +11:00
Andrew Tridgell cb16733918 AP_Compass: switched to a vector based interface 
this is more consistent with other APIs and makes multi-device support
easier
 2013-12-09 17:34:06 +11:00
Randy Mackay 84fdff4cd6 Compass: slightly relax HMC5843 calibration limits 
Some users have reported Z axis values as high as 1.33.  Their compasses
seem otherwise health so extending the limits slightly.
 2013-11-27 15:36:34 +09:00
Andrew Tridgell 1ccd6bb7ef AP_Compass: don't wait more than 1ms for compass sample 
this prevents 5ms delays in compass accumulate
 2013-10-08 11:50:54 +11:00
Andrew Tridgell f286369990 AP_Compass: fixed orientation on Linux 2013-10-08 11:50:54 +11:00
Andrew Tridgell 83c942a512 AP_Compass: prevent NULL deref on enable mag while running 2013-10-08 11:50:53 +11:00
Andrew Tridgell da14ad2e2d AP_Compass: neaten up HMC5883 debug 2013-09-28 21:24:02 +10:00
Andrew Tridgell ce7d458855 AP_Compass: added Linux support to the compass test 2013-09-28 21:24:02 +10:00
Andrew Tridgell 6fc5b06043 AP_Compass: fixed some old Serial.print calls 2013-09-28 21:24:02 +10:00
Andrew Tridgell 1243ab9e63 AP_Compass: added HAL_Linux support 2013-09-28 21:24:02 +10:00
Andrew Tridgell 3f0f8dfa62 AP_Compass: removed SMACCM support 2013-09-26 22:38:31 +10:00
Mike McCauley 2fa0c39f3a AP_Compass: added Flymaple orientation 2013-09-24 13:18:35 +10:00
Mike McCauley 4c65c42411 AP_Compass: fixed ARM 32 bit compatibility 2013-09-23 18:10:21 +10:00
Andrew Tridgell 229841052a AP_Compass_PX4: removed MAGIOCSSAMPLERATE call 2013-09-09 18:04:41 +10:00
Andrew Tridgell db14a85fc5 AP_Compass: added more debugging to AP_Compass_PX4 driver 
this helps debug compass initialisation issues
 2013-09-09 18:04:40 +10:00
Andrew Tridgell b8b72819c1 AP_Compass: ignore COMPASS_ORIENT for internal compass 
this means if COMPASS_ORIENT is not 0 and the external compass fails
to start on boot we don't end up with a bad compass orientation
 2013-09-07 16:49:51 +10:00
Andrew Tridgell 9320e82ac2 AP_Compass: added in new orientations 2013-08-30 14:19:03 +10:00
Andrew Tridgell fbf79c07f0 AP_Compass: added COMPASS_EXTERNAL option 
this allows configuring of a compass as being externally attached
 2013-08-30 14:02:09 +10:00
Andrew Tridgell 97b7130bb9 libraries: update license header to GPLv3 
we switched to GPLv3 a long time ago, but neglected to update the
per-file license headers
 2013-08-30 13:01:39 +10:00
Andrew Tridgell 1ff669eb97 AP_Compass: simplify PX4 compass driver 
we can now rely on queueing in the NuttX driver
 2013-08-30 13:01:34 +10:00
Andrew Tridgell feac9d1306 AP_Compass: fixed a bug in the tilt compass calculation 
The simplification applied a few months ago was incorrect
 2013-08-18 21:08:52 +10:00
Tobias ab311d1dd4 AP_Compass: removed comparison out of range compiler warning 
uint_ >= 0 (-Wtype-limits)
 2013-07-08 14:57:25 +10:00
Andrew Tridgell a6c7bd3612 AP_Compass: fixed rotations for COMPASS_ORIENT 
this matches AHRS_ORIENTATION again
 2013-07-08 12:17:59 +10:00
Craig@3DR 1a3ed2d80b AP_Compass: Corrected COMPASS_ORIENT Parameter Description 2013-06-26 19:14:24 -07:00
Andrew Tridgell 4007b7b1e9 AP_Compass: fixed indent-tabs-mode 2013-05-30 09:52:30 +10:00
Randy Mackay 80bd458f29 Compass: update parameter description 
We do not want people modifying the COMPASS_MOTCT manually
 2013-05-11 14:50:36 +09:00
Andrew Tridgell 9a87b3f3c1 AP_Compass: use const on more functions and remove old calculate_heading() 
the calculate_heading() based on roll/pitch is not needed anywhere
 2013-05-09 09:24:06 +10:00
Andrew Tridgell f78de63a09 AP_Compass: more efficient calculate_heading() implementation 
Thanks to piersh for this improvement. See

b5f0635455 (commitcomment-3171806)
 2013-05-09 09:24:06 +10:00
Andrew Tridgell c90d44c121 AP_Compass_HIL: fixed indentation 2013-05-02 21:31:17 +10:00
Andrew Tridgell f72dd560cb AP_Compass: fixed the HIL sensors compass 
this sets up good compass values for HIL sensors
 2013-05-02 14:59:33 +10:00
Andrew Tridgell 86027f6e0f AP_Compass: fixed PX4 build 2013-05-02 13:00:52 +10:00
Andrew Tridgell af50b652f8 AP_Compass: removed old orientation defines 
we now use the rotations in libraries/AP_Math/rotations.h
 2013-05-02 12:48:14 +10:00
Andrew Tridgell 217f34e155 AP_Compass: added COMPASS_ORIENT parameter, to support external compasses 
this allows the user to configure the compass for any orientation
supported by our rotation library
 2013-05-02 12:48:14 +10:00
Andrew Tridgell ba83950fc4 libraries: replace constrain() with constrain_float() 
this makes the type much more obvious. Thanks to Tobias for the
suggestion.
 2013-05-02 10:25:40 +10:00
Andrew Tridgell 0fce0eb488 AP_Compass_PX4: fixed handling of a saturated compass 
a saturated compass is now marked unhealthy, rather than causing the
code to spin waiting for a valid sample. This fixes a problem with
strong magnets causing the main flight loop to stop
 2013-05-01 08:54:53 +10:00
Andrew Tridgell 26fa5c40f1 Compass: use const references for some functions 2013-04-22 13:26:49 +10:00
Randy Mackay b8974dec99 Copter: compass learn off by default 2013-04-16 18:47:39 +09:00
Randy Mackay b48864e1ad Copter: allow CH6 tuning of compass declination 2013-04-15 21:50:44 +09:00
Christopher Hrabia 9760cdf2d7 Compass: corrected space 2013-03-18 14:27:49 +09:00
Randy Mackay b8d492b504 Compass: current based compensation added 2013-03-03 23:02:12 +09:00
Randy Mackay e113eb526b Compass: add get_motor_compensation 
Remove redundant set_motor_compensation call
 2013-03-02 17:53:03 +09:00
Randy Mackay bfb29ce22b Compass: remove virtual functions to save RAM 2013-03-02 00:07:32 +09:00
Randy Mackay 886725291c Compass: enable motor compensation for 1280 
Expand motor compenstion vector's range limit
 2013-03-02 00:03:29 +09:00
Randy Mackay 8093c98cd3 Compass: add motor compensation to HIL library 2013-03-02 00:03:24 +09:00
Randy Mackay d8515ff85e Compass: basic compensation for motor interference 2013-03-02 00:03:16 +09:00
Andrew Tridgell 80eaa52ed8 AP_Compass: use report timestamp on PX4 for accurate timing 2013-01-22 21:22:01 +11:00
James Bielman 4fa7bb1486 Add AVR compatibility header for missing math.h definitions. 
- Define float versions of math functions to the double versions
  on AVR (eg. #define sinf sin).
- These macros appear to be missing in older versions of avr-libs.
- Include AP_Math.h rather than math.h to get these definitions.
 2013-01-16 13:52:17 +11:00
James Bielman 5631f865b2 Update floating point calculations to use floats instead of doubles. 
- Allows use of hardware floating point on the Cortex-M4.
- Added "f" suffix to floating point literals.
- Call floating point versions of stdlib math functions.
 2013-01-16 13:52:01 +11:00
Andrew Tridgell 60a4447a86 AP_Compass: added set_board_orientation() method 2013-01-13 17:32:48 +11:00
Andrew Tridgell 8f424cdf21 AP_Compass: ensure we check we got the semaphore 2013-01-09 20:42:20 +11:00
James Bielman eca1417858 AP_HAL: Add semaphores to I2C driver. 
- Guard I2C transactions with this semaphore in the MS5611 and
  HMC5843 drivers.
 2013-01-04 15:43:43 -08:00
Andrew Tridgell 26bc278181 AP_Compass: use queue length 10 in PX4 driver 
and remove unnecessary poll() call
 2013-01-04 20:12:03 +11:00
Andrew Tridgell 741174f5d5 AP_Compass: first cut at a PX4 compass driver 2013-01-04 16:21:24 +11:00
rmackay9 bf77a0f2e4 AP_Compass: added parameter descriptions 2013-01-02 16:08:44 +09:00
Andrew Tridgell 374af1cd14 build: change from Arduino.mk to apm.mk 2013-01-02 17:29:37 +11:00
Andrew Tridgell a180437028 AP_Compass: disable auto-declination on 1280 
this saves a few k of flash space
 2012-12-20 14:53:23 +11:00
Andrew Tridgell a1187519a8 AP_HAL: use AP_HAL_BOARD_DRIVER in remaining test sketches 2012-12-20 14:52:37 +11:00
Pat Hickey eb530b86e8 move Arduino.mk to /mk/Arduino.mk 2012-12-20 14:52:35 +11:00
Andrew Tridgell 7d27e420ae AP_HAL: remove unnecessary Arduino.h includes 2012-12-20 14:52:30 +11:00
Andrew Tridgell c181498e36 Compass: updates for new AP_Param API 2012-12-20 14:51:38 +11:00
Pat Hickey 475da4eca4 CONFIG_HAL_BOARD - test sketches fixed up, build all passes 2012-12-20 14:51:37 +11:00
Andrew Tridgell b70f7f57ba AP_Compass: restore low speed change on register read failure 2012-12-20 14:51:37 +11:00
Pat Hickey a4f1f6a5db AP_Progmem: fix dependencies for all sketches touched by AP_HAL_AVR 2012-12-20 14:51:28 +11:00
Pat Hickey 53432a1101 AP_Compass: ported to AP_HAL 2012-12-20 14:51:26 +11:00
Pat Hickey 3f1d9d7f69 AP_Param: #include <AP_Param.h> fixups for libraries & sketches 
* I mostly went through with grep and added an #include <AP_Param.h> below
  every #include <AP_Common.h>. Not all of these example sketches might
  strictly need AP_Param.
 2012-12-20 14:51:19 +11:00
Andrew Tridgell daa4712078 AP_Compass: force I2C speed low in a couple more situations 2012-11-12 11:26:20 +11:00
Andrew Tridgell 8c2dadc12f AP_Compass: print I2C error count in test sketch 2012-11-12 10:28:26 +11:00
Andrew Tridgell 6922dcdea2 Compass: added compass.accumulate() API 
this allows us to accumulate mag readings using spare CPU cycles
 2012-09-08 10:05:54 +10:00
uncrustify 04e48ef878 uncrustify libraries/AP_Compass/Compass.h 2012-08-21 19:19:51 -07:00
uncrustify 6bc9c5707f uncrustify libraries/AP_Compass/AP_Compass_HMC5843.h 2012-08-21 19:01:34 -07:00
uncrustify f534730fab uncrustify libraries/AP_Compass/AP_Compass_HIL.h 2012-08-21 19:01:21 -07:00
uncrustify 4f9c6bbb19 uncrustify libraries/AP_Compass/AP_Compass_HMC5843.cpp 2012-08-21 19:01:20 -07:00
uncrustify 7840eebaef uncrustify libraries/AP_Compass/Compass.cpp 2012-08-21 19:01:20 -07:00
uncrustify d1190e1ed4 uncrustify libraries/AP_Compass/AP_Compass_HIL.cpp 2012-08-21 19:01:20 -07:00
uncrustify 53ef9e8b9e uncrustify libraries/AP_Compass/examples/AP_Compass_test/AP_Compass_test.pde 2012-08-21 19:01:20 -07:00
rmackay9 9b3ced93ee AP_Compass: fix for mismatching set_initial_location parameters (forgot to change long to int32_t in .cpp file) 2012-08-18 20:41:38 +09:00
rmackay9 71f12fbc9b AP_Compass: replace "long" with "int32_t" 2012-08-18 16:58:16 +09:00
Andrew Tridgell 518d6365ff AP_Param: update remaining libraries for new constructor syntax 2012-08-08 12:11:57 +10:00
Andrew Tridgell e4d28b12e5 Compass: remove the need to call calculate() on the compass object 
the new AHRS code doesn't use calculate() and the compass.heading
attribute. Instead it works on the raw magnetometer vector. This
change removes the internal calculate state from the compass object
and instead adds calculate_heading() for use by older code that
doesn't go via AHRS.

This significantly reduces the calculation involved in compass updates

The null offsets enable/disable code is also removed, as it is not
needed now that compass offsets are not linked to the AHRS state.
 2012-06-27 16:01:50 +10:00
rmackay9 ef43da9b92 AP_Compass - changed parameter initialisation order to remove compiler warning 2012-04-09 17:37:02 +09:00
Andrew Tridgell 504c53f746 Compass: added COMPASS_AUTODEC option 
when this is 1 (which is the default), we will get the declination
automatically via the AP_Declination library

when it is 0 we will use the value configured by the user
 2012-03-30 14:25:27 +11:00
Andrew Tridgell 16deefce31 Compass: fixed a comment 2012-03-29 12:39:53 +11:00
Andrew Tridgell 17290836ef Compass: added some more comments 
explain the algorithm a bit more
 2012-03-29 12:39:53 +11:00
Andrew Tridgell b2d6db9479 Compass: implement noise resistant varient of offset learning 
This adds a large amount of noise robustness to the compass offset
learning algorithm, at a cost of 120 bytes of memory. The changes are
based on a long discussion with Bill Premerlani.
 2012-03-28 20:55:27 +11:00
Andrew Tridgell a72d4b46b3 Compass: implement Bills new offset nulling algorithm 
this seems to work much better than the old algorithm, converging
faster and more accurately. Even better, it has no linkage to DCM, so
no possibility of nasty feedback effects
 2012-03-27 15:37:24 +11:00
Andrew Tridgell 7daaadf776 Compass: fixed the order of rotations in the compass driver 
this should fix the massive heading issues that people have been
reporting. Please test!
 2012-03-12 17:33:15 +11:00
Adam M Rivera fe8c896d69 AP_Declination: Added method set_initial_location 
This will set the declination based on lat/lon if the user has
not yet saved one to the EEPROM, OR if they have specified via the
config parameter that they want it to overwrite the declination every
3D fix.

Signed-off-by: Andrew Tridgell <tridge@samba.org>
 2012-03-11 20:59:47 +11:00
Andrew Tridgell d10c4b76ad Compass: removed an incorrect comment 2012-03-11 20:07:38 +11:00
Andrew Tridgell 0da64e98f8 Compass: don't save the orientation to EEPROM 
there is no point in saving this, the value is only configurable at
compile time for now, and is always set
 2012-03-11 15:37:07 +11:00
Andrew Tridgell cb96dd975f Compass: update the compass driver to use the new vector.rotate() method 2012-03-11 15:37:07 +11:00
Andrew Tridgell 6eff9107ea Compass: change last_update to be in microseconds 2012-03-10 10:34:32 +11:00
Andrew Tridgell 6d356b6c6e Compass: fixed last_update time for HIL compass 2012-03-10 10:34:30 +11:00
rmackay9 fa34ac076e AP_Compass - fixed compile warning 2012-02-29 22:57:35 +09:00
rmackay9 c819a0f68a AP_Compass - fixed small compiler warning to do with order of parameters in constructor 2012-02-29 22:45:49 +09:00
Andrew Tridgell d0a6359b37 Compass: use constructor to set initial values for _learn and _use_for_yaw 
this ensures they are set if you have MAG_ENABLE==0
 2012-02-25 17:36:31 +11:00
Andrew Tridgell f59297d7a7 Compass: catch the case of a user enabling a compass mid-flight 
if a compass has not been initialised at startup we can't enable it
mid-flight, as we don't have the orientation
 2012-02-25 14:51:09 +11:00
Andrew Tridgell 664622523d Compass: added COMPASS_LEARN and COMPASS_USE parameters 
these allow you to control if the compass should be used for yaw and
if it should learn its offsets. This is useful for locking in compass
offsets once they are confirmed to be good, and for learning offsets
without using them in flights.

The default is to behave the same as previously, which is
COMPASS_LEARN=1 and COMPASS_USE=1
 2012-02-25 14:51:08 +11:00
Andrew Tridgell c354879f1f Compass: ensure we don't produce NAN values for compass heading 
this leaves the previous heading values alone if we are at a pitch of
exactly 90 or -90, at which point we can't compute a meaningful
heading
 2012-02-24 11:52:55 +11:00
Andrew Tridgell 62326c0f72 Compass: enable compass offsets for HIL compass 
this makes the null_offsets algorithm have an effect for the HIL
compass that is used for SITL, which makes for easier testing of
compass calibration
 2012-02-15 22:33:50 +11:00
Andrew Tridgell 6a42598ade use stdint types in the compass code 2012-02-14 08:35:03 +11:00
Andrew Tridgell 9c5a5473ab added indexes to group info structures 2012-02-13 16:22:52 +11:00
Andrew Tridgell bf4a77da81 convert libraries to new typesafe macros 2012-02-13 16:22:51 +11:00
Andrew Tridgell 8c58d95187 modify the compass code for AP_Param 2012-02-13 16:22:51 +11:00
Randy Mackay ed19c25a97 Arduino 1.0 - changed all #includes of "WProgram.h", "wiring.h" and "WConstants.h to "Arduino.h". 
Modified FastSerial's write function to return size_t (number of bytes written).
 2012-01-28 12:25:47 +09:00
Doug Weibel e22a83eec0 Add a CLI setup action to reset the magnetometer offsets 
Since the magnetometer offsets are not available through the MAVLink parameter interface (since they are an AP_Var vector) this little feature allows them to be reset from the CLI.  Useful if you somehow get bad offsets or if you change magnetometer.  If you have a bad set of large offset values I have seen issues with the nulling algorithm have trouble converging to the proper values.  I have never seen it have trouble converging from 0/0/0, so this could be a useful feature from time to time.
 2012-01-15 16:15:08 -07:00
Doug Weibel 9846822748 Bug fix for compass. 
This is a fix for an interesting bug when a DCM matrix reset was added to the ground start.  This bug only showed up if (A) a ground start were performed after an air start or due to use of the "Calibrate Gryo" action, (B) if the current orientation were sufficiently different from 0/0/0, and (C.) if the particular magnetometer had sufficiently large offsets.  Why did resetting the DCM matrix to 0/0/0 pitch/roll/yaw at ground start cause a bug?  The magnetometer offset nulling determines the proper offsets for the magnetometer by comparing the observed change in the magnetic field vector with the expected change due to rotation as calculated from the rotation in the DCM matrix.  This comparison is made at 10Hz, and then filtered with a weight based on the amount of rotation to estimate the offsets. Normally it would take considerable time at normal in-flight rotation rates for the offset estimate to converge. 

If a DCM matrix reset occurs when the offset nulling algorithm is up and running, the algorithm sees the DCM reset as a instantaneous rotation, however the magnetic field vector did not change at all.  Under certain conditions the algorithm would interpret this as indicating that the offset(s) should be very large.  Since the "rotation" could also have been large the filter weighting would be large and it was possible for a large erroneous estimate of the offset(s) to be made based on this single (bad) data point.

To fix this bug methods were added to the compass object to start and stop the offset nulling algorithm.  Further, when the algorithm is started, it is set up to get fresh samples.  The DCM matrix reset method now calls these new methods to stop the offset nulling before resetting the matrix, and resume after the matrix has been reset.
 2012-01-12 14:44:24 -07:00
Andrew Tridgell 60185509f4 AP_Compass: when I2c fails, don't retry for 1s 2012-01-04 16:35:47 +11:00
Andrew Tridgell 820153d7ae compass: show timing in compass test 2011-12-28 21:44:18 +11:00
Andrew Tridgell acf4e9b61d I2C: convert compass code to new I2C library 
this also adds a healthy attribute, and error checking on all I2C
calls
 2011-12-28 20:41:53 +11:00
Andrew Tridgell 6093db948b compass: added AP_COMPASS_APM2_SHIELD 
this makes the orientation clearer
 2011-11-25 20:00:18 -08:00
James Goppert 0c7c508541 Optional recursion added. 2011-09-30 17:17:51 -04:00
James Goppert 5489b84f8e Improvements to cmake. 2011-09-29 21:23:26 -04:00