Is the IO MCU of Pixhawk 6C different from other designs?

sherryglamor · July 4, 2025, 4:27am

Hi there.

I am designing a flight control board based on Pixhawk 6c but I cannot find the IO MCU schematic and pinout for 6C. I see that the IO MCU of fmuv3 is similar to the IO MCU of 6C in Block Diagram. The only difference is that 6C has an additional status LED. If I don’t care about this LED, can I just use the IO MCU hardware design and bootloader of fmuv3?

Thx!

Alp_Ucan · July 7, 2025, 6:11pm

Hi @sherryglamor I’m not an expert about hardware but as I understand you can try to build a custom carrier board for 6C right ? You can check ardupilot documents also to see which pin connected physically to which port.

github.com/ArduPilot/ardupilot

libraries/AP_HAL_ChibiOS/hwdef/Pixhawk6C/hwdef.dat

fa6b5995f

# hw definition file for processing by chibios_hwdef.py
# for the HolybroV6C hardware


# default to all pins low to avoid ESD issues
#DEFAULTGPIO OUTPUT LOW PULLDOWN

# MCU class and specific type
MCU STM32H7xx STM32H743xx

# crystal frequency
OSCILLATOR_HZ 16000000

# ChibiOS system timer
STM32_ST_USE_TIMER 2

# USB setup
USB_VENDOR 0x3162 # ONLY FOR USE BY Holybro
USB_PRODUCT 0x0053
USB_STRING_MANUFACTURER "Holybro"

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And check this for PX4

github.com/PX4/PX4-Autopilot

boards/px4/fmu-v6c/nuttx-config/include/board.h

5a2b26f93

/************************************************************************************
 * nuttx-configs/px4_fmu-v6c/include/board.h
 *
 *   Copyright (C) 2016-2019 Gregory Nutt. All rights reserved.
 *   Authors: David Sidrane <david.sidrane@nscdg.com>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 3. Neither the name NuttX nor the names of its contributors may be
 *    used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *

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Finally

Nowadays I’m trying to understand harware level of PX4 so if you find a useful source please share it.

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Is the IO MCU of Pixhawk 6C different from other designs?

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