2023-06-13 18:40:10 -03:00
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# BrainFPV RADIX 2 HD Flight Controller
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The BrainFPV RADIX 2 HD is a flight controller primarily intended for
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First Person View (FPV) applications that use a HD (digital) FPV system.
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For the full documentation, refer to the [BrainFPV website](https://www.brainfpv.com/kb/radix-2-hd/).
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## Features
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- STM32H750 microcontroller
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- IMU: Bosch Sensortec BMI270
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- Barometer: Infineon DPS310
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- Onboard flash: 16 MB connected via QUADSPI
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- microSD slot
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- 6 UARTs plus USB (7 UARTs with alternate board config)
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2023-06-13 18:40:10 -03:00
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- 10 PWM outputs (8 supporting BDSHOT on dual 4-in-1 ESC connectors)
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- I2C and CAN port
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- Builtin RGB LED
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- Analog input for voltage sensing, up to 12S (52 V)
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- Analog input for current sensing
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- Analog input for RSSI
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- External buzzer
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- USB Type-C connector
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- Battery voltage 3S-8S (35 V)
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- 5 V / 1.5 A voltage regulator for powering flight controller and external devices
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- 9 V / 2 A voltage regulator for HD FPV system (can be turned on/off using the Relay2 switch)
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- Size: 37 x 37 mm (30.5 mm hole spacing)
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- Weight: 7g
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- Made in the USA, NDAA compliant
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## Pinout
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Refer to the [full documentation](https://www.brainfpv.com/kb/radix-2-hd/) for details
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and how to use the "PWR:VBAT" jumper.
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## UART Mapping
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- SERIAL0 -> USB
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- SERIAL1 -> UART1 (DMA-enabled, MSP DisplayPort OSD)
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- SERIAL2 -> UART2 (DMA-enabled, GPS)
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- SERIAL3 -> UART3 (DMA-enabled, RCin)
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- SERIAL4 -> UART4 (spare)
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- SERIAL5 -> UART5 (spare)
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- SERIAL6 -> UART6 (spare, PWM 9 and 10 by default, use BRD_ALT_CONFIG = 1 for UART)
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- SERIAL7 -> UART7 (spare, RX is on HD connector for RC input, TX is not connected to external pad)
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## RC Input
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By default, SERIAL3 is used for RC input. The RC receiver 5 V pad next to RX3 ("+") is
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also powered from USB for easy and safe configuration without having to connect the main
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battery.
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## PWM Output
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The RADIX 2 HD has a total of 10 PWM outputs. The first 8 outputs support BDSHOT and
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are on two 4-in-1 ESC connectors. The PWM outputs are in groups of 2 channels each,
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all channels in the same group need to use the same configuration / rate.
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- PWM 1-2 Group 1
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- PWM 3-4 Group 2
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- PWM 5-6 Group 3
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- PWM 7-8 Group 4
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- PWM 9-10 Group 5 (These are on the TX6 and RX6 pads that can also be used for SERIAL6)
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## Analog inputs
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The RADIX 2 HD has 3 analog inputs:
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- ADC Pin 10 -> Battery Voltage (VBAT pin, builtin 1:17.6 voltage divider)
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- ADC Pin 3 -> Battery Current Sensor (CUR pin)
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- ADC Pin 11 -> RSSI voltage monitoring (RSSI pad)
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## Battery Monitoring
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The RADIX 2 HD can monitor battery voltages up to 12S using a built-in voltage divider.
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The board itself can be powered by battery voltages up to 8S (35 V) and there is a jumper
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to use the same pin for battery voltage monitoring and for powering the board.
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WARNING Powering the board with more than 8S (35 V) with the "PWR:VBAT" jumper soldered
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will damage it. Refer to the official documentation for more details.
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In addition to voltage sensing, the board also has an input for an external current sensor.
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## Loading Firmware
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The RADIX 2 HD uses a proprietary bootloader. To load firmware, download the firmware binary file
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from the [BrainFPV website](https://www.brainfpv.com/firmware) and copy it to the USB drive
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that appears when connecting the RADIX 2 HD to your computer when it is in bootloader mode
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(hold the BOOT button and release when connecting to USB).
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Note: When using Ardupilot, it is necessary to have a microSD card inserted, without it
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the firmware won't run.
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Alternatively, you can create your own firmware file using the [BrainFPV Firmware Packer](https://github.com/BrainFPV/brainfpv_fw_packer).
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To create a file for Ardupilot, install the BrainFPV Firmware Packer:
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pip install git+https://github.com/BrainFPV/brainfpv_fw_packer.git
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After that, build the Copter firmware:
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./waf configure --board RADIX2HD
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./waf copter
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Finally, use the firmware packer script to create the firmware file that can be used with the
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BrainFPV bootloader:
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./libraries/AP_HAL_ChibiOS/hwdef/RADIX2HD/pack_firmware.sh copter
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To use it, copy the resulting `arducopter_{VERSION}_brainfpv.bin` to the USB drive that appears
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when the RADIX 2 HD is in bootloader mode. Once it finishes copying, safely remove the drive.
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At this point the RADIX 2 HD will reboot and run the Copter firmware.
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