ESP32 Forum

Posted: **Tue Nov 22, 2022 3:45 pm**

Hi,

I am following this page of documentation for setting communication pins:
https://docs.espressif.com/projects/esp ... ation-pins

why it is like this:

Code: Select all

ESP_ERROR_CHECK(uart_set_pin(UART_NUM_2, 4, 5, 18, 19));

insterad of this:

Code: Select all

ESP_ERROR_CHECK(uart_set_pin(UART_NUM_2, 17, 16, 18, 19));

?

Since we are defining the pin numbers of the second uart, it make sense to use the pins that are allocated to uart_2.

Am I missing something?

Thanks

Posted: **Wed Nov 23, 2022 6:55 am**

It doesn't really matter. The pins can be anything (well, anything sensible) and the GPIO matrix will route the signals there. There are no pins 'allocated' to any UART; the pins indicated in the datasheet are simply the default pins for it.

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