ESP32-S3 RDM issues with UART0 about esp_dmx

[lft8]

Platform is Arduino and USB CDC is disabled btw

[someweisguy]

Are you comfortable editing library code? If so, I'd like you to try something for me. I think it would be faster than me trying to determine how to test this.

I think I may have an if-statement in the UART initialization code that is causing the problem for you. It can be found here. Currently, the code looks like this:

  if (dmx_num != 0) {  // Default UART port for console
#if SOC_UART_REQUIRE_CORE_RESET
    // ESP32C3 workaround to prevent UART outputting garbage data
    uart_ll_set_reset_core(uart->dev, true);
    periph_module_reset(uart_periph_signal[dmx_num].module);
    uart_ll_set_reset_core(uart->dev, false);
#else
    periph_module_reset(uart_periph_signal[dmx_num].module);
#endif
  }

I believe the if (dmx_num != 0) needs to be edited. If you are comfortable doing so, try changing it to if (true) so that the if-statement is always executed. I think this may solve your problem until I am able to patch this.

[someweisguy]

Thanks for the kind words!

This is a great question. It is possible that there is a hardware limitation with UART0 on the S3. I may be able to patch it if this is the case. I will investigate!

[lft8]

Yes absolutely, I’m more than happy to modify the library and test it. It’ll be a couple of days before I can undertake testing but as soon as I do I’ll let you know how it goes.
Many thanks!

[lft8]

I've managed to test this today but it still has the same issue I'm afraid.
I assume its related to the ESP32-S3 having on-board USB serial debug for USB attached to this UART (even though I have disabled it) so I doubt there is much else that can be done unfortunately.
Many thanks for looking into this though!