4th uart port on pixhawk 4 mini

Pixhawk
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Hello I have more than 3 uart connected devices, can I use a 4th uart on the FMU DEBUG port for the device?

2

Hello,

I have the same question regarding a pixhawk 6c mini, can I use the FMU Debug Port tx/rx pin as standard uart ?
(In a custom module to talk to an external device or to set up a mavlink connection to companion computer)

thanks

3

Yes, you can, but you will have to disable the NuttX console on it.

For 6C, you have to remove: PX4-Autopilot/boards/px4/fmu-v6c/nuttx-config/nsh/defconfig at 161b5302476d8ce186ad57ae387c7b7fa5f0fcfb · PX4/PX4-Autopilot · GitHub

And add a Telem port here:

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4

Hi,
Thanks for your reply, it works !

I removed the line you pointed out in defconfig, and added :
CONFIG_BOARD_SERIAL_TEL4=“/dev/ttyS2”
below line 7 in boards/px4/fmu-v6c/default.px4board.

But I don’t know why “ttyS2”. Is it a lucky guess ?

Anyway, it’s working so I’m happy :slight_smile:

Best

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5

The mapping for 6C is here:

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