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Readme.md
CSKY405 Flight Controller
The CSKY405 is a flight controller produced by ClearSky.
Features
Processor
STM32F405 168Mhz, 1MB 32-bit processor
AT7456E OSD
Sensors
BMI088 Acc/Gyro
BMP390 barometer
Power
2S - 6S Lipo input voltage with voltage monitoring
90A Cont., 215A peak current monitor
12V, 2A BEC for powering Video Transmitter controlled by GPIO
5V, 2.5A BEC for internal and peripherals
Interfaces
10x PWM outputs DShot capable
1x RC input
6x UARTs/serial for GPS and other peripherals
I2C port for external compass, airspeed, etc.
microSDCard for logging, etc.
USB-C port
Overview
Wiring Diagram
UART Mapping
The UARTs are marked Rn and Tn in the above pinouts. The Rn pin is the receive pin for UARTn. The Tn pin is the transmit pin for UARTn.
- SERIAL0 -> USB
- SERIAL1 -> UART4 (MAVLink2 telem)
- SERIAL2 -> USART1 (Serial RC input) (DMA capable)
- SERIAL3 -> UART5 (GPS)
- SERIAL4 -> USART3 (User) (TX DMA capable)
- SERIAL5 -> USART6 (User) (TX DMA capable)
- SERIAL6 -> USART2(DMA Capable) (RX2 normally only used for single wire RC inputs (SBUS)PPM,etc.)t, but can be used as normal UART if :ref:
BRD_ALT_CONFIG<>=1)
RC Input
RC input is configured on the RX2 pin (inverted and sent to UART2_RX). It supports all single wire RC
protocols except serial protocols such as CRSF, ELRS, etc. Instead, these devices can be connected using both TX2 and RX2 if if :ref:BRD_ALT_CONFIG<BRD_ALT_CONFIG> =1 and :ref:SERIAL6_PROTOCOL<SERIAL6_PROTOCOL> set to "23".
OSD Support
The CSKY405 supports using its internal OSD using OSD_TYPE 1 (MAX7456 driver). External OSD support such as DJI or DisplayPort is supported using USART6 or any other free Uaet. See :ref:common-msp-osd-overview-4.2 for more info.
PWM Output
The CSKY405 supports up to 10 PWM outputs. All outputs support DShot.
The PWM is in 5 groups:
- PWM 1 in group1
- PWM 2 in group2
- PWM 3,4 in group3
- PWM 5,6,10 in group4
- PWM 7 in group5
- PWM 8,9 in group6
Battery Monitoring
The board has a builting voltage and current sensors. The current sensor can read up to 90A continuosly, 215 Amps peak. The voltage sensor can handle up to 6S LiPo batteries.
The correct battery setting parameters are set by default and are:
- BATT_MONITOR 4
- BATT_VOLT_PIN 14
- BATT_CURR_PIN 7
- BATT_VOLT_MULT 21.0
- BATT_AMP_PERVLT 10.35
Compass
The CSKY405 does not have a built-in compass, but you can attach an external compass using I2C on the SDA and SCL pads.
VTX power control
GPIO 84 controls the VTX BEC output to pins marked "12V". Setting this GPIO high removes voltage supply to pins.
Loading Firmware
Firmware for these boards can be found at https://firmware.ardupilot.org in sub-folders labeled CSKY405.
Initial firmware load can be done with DFU by plugging in USB with the boot button pressed. Then you should load the "CSKY405_bl.hex" firmware, using your favourite DFU loading tool.
Subsequently, you can update firmware with Mission Planner.