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README.md
Skystars H7 Flight Controller
The Skystars H7 is a flight controller produced by Skystars.
Features
- STM32H743 microcontroller
- BMI270 IMU x2
- BMP280 barometer
- AT7456E OSD
- 8 UARTs
- 9 PWM outputs
Pinout
UART Mapping
The UARTs are marked RX and TX in the above pinouts. The RX pin is the receive pin for UARTn. The TX pin is the transmit pin for UARTn.
- SERIAL0 -> USB
- SERIAL1 -> UART1 (RX, DMA-enabled)
- SERIAL2 -> UART2 (DMA-enabled)
- SERIAL3 -> UART3 (ESC Telem)
- SERIAL4 -> UART4 (GPS, DMA-enabled)
- SERIAL5 -> UART5 (VTX)
- SERIAL6 -> UART6 (DJI FPV, DMA-enabled)
- SERIAL7 -> UART7 (DMA-enabled)
- SERIAL8 -> UART8
RC Input
RC input is configured on the R1 (UART1_RX) pin in the DJI connector or via the R1/T1 (UART1) pads. It supports all serial RC protocols. For protocols requiring half-duplex serial to transmit telemetry (such as FPort) you should setup SERIAL1 with half-duplex and connect to T1 or use R1 with pin-swap. You also need to set inversion enabled if using FPort.
OSD Support
The Skystars H7 supports OSD using OSD_TYPE 1 (MAX7456 driver).
PWM Output
The Skystars H7 supports up to 9 PWM outputs. The pads for motor output M1 to M8 on the two motor connectors, plus M9 for LED strip or another PWM output.
The PWM is in 5 groups:
- PWM 1, 2 in group1
- PWM 3, 4 in group2
- PWM 5-8 in group3
- PWM 9 in group4
Channels within the same group need to use the same output rate. If any channel in a group uses DShot then all channels in the group need to use DShot. Outputs 1-8 support bi-directional dshot.
Battery Monitoring
The board has a builtin voltage and current sensor. The current sensor can read up to 130 Amps. The voltage sensor can handle up to 6S LiPo batteries.
The correct battery setting parameters are:
- BATT_MONITOR 4
- BATT_VOLT_PIN 10
- BATT_CURR_PIN 11
- BATT_VOLT_MULT 10.1
- BATT_AMP_PERVLT 17.0
Compass
The Skystars H7 does not have a builtin compass, but you can attach an external compass using I2C on the SDA and SCL pads.
Loading Firmware
Initial firmware load can be done with DFU by plugging in USB with the bootloader button pressed. Then you should load the "with_bl.hex" firmware, using your favourite DFU loading tool.
Once the initial firmware is loaded you can update the firmware using any ArduPilot ground station software. Updates should be done with the *.apj firmware files.