Change uart pins for logger

ESPHome
1

Hi, I’m running into strange issues with esphome on an esp32-s2 where the esp resets, doesn’t reconnect or just hangs.
To troubleshoot this I would like to attach a ftdi to the esp. I’ve tried using the usb port, but the port is being disconnected upon resets and I’m missing information then.
I would like to change the pins of the logger UART so they are on over of the pins brought out of the esp32. How can I achieve that?

2

Have you looked at the docs - specifically this table?

3

Yes, I did indeed. This table shows how to change the UART used for the logger, but nowhere how to change the pins used for the UART.

4

I suspect the only way is to fork your own version of one or more components (like the logger) and do it in code.

5

Thanks for your suggestion. This made me think of using a lambda function to initialise the UART with the pins I want to use. Have to figure out how still, if someone has a suggestion they are welcome!

6

For anyone having the same question in the future, this is how is solved it.

esphome:
  ...
  on_boot:
    priority: 800.0
    then:
      lambda: |-
        uart_set_pin(UART_NUM_0, 18, 33, UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE);

logger:
  baud_rate: 115200
  hardware_uart: UART0
1 Like
7

There seems to have been an API change. I used this:

uartSetPins(0, 20, 21, -1, -1);

I’m using an esp32c3 supermini. Maybe that’s why the constants UART_NUM_0 and UART_PIN_NO_CHANGE were not available. -1 means don’t change, I assigned pins 20 and 21 to UART 0.

For anybody with future issues, I used this to troubleshoot (remotely) an esp that was crashing.