ESP32 Forum

Hi,
I am using ESP32-WROVER-IE-N8R8 in my project. I require two set of UART lines , I can use pin 34 and 35 as one set. what are all the pins I can use for UART lines?
When I look at the IC datasheet, I found there are three set of UART lines so I look up the I/O MUX table to find it. I found that the pins that has UART is already used for other purpose in the module. Can I use other pins as UART?
I am attaching the I/O MUX table and the blue highlighted text represents the UART Lines.

Can I use other pins as UART?

Yes: https://docs.espressif.com/projects/esp ... ation-pins

Hi,
If is it possible to configure any GPIO pins as UART then why do manufacturers particularly specify UART pins in I/O MUX table.

Because that's the 'default' pins for that function; e.g. the ROM uses (or can use) those.

Kindly explain in detail.

Suresh_C wrote: ↑

Mon Nov 27, 2023 5:57 am

If is it possible to configure any GPIO pins as UART then why do manufacturers particularly specify UART pins in I/O MUX table.

Because that is what the IO MUX can do. If this is what you need, you can route a signal to/via the IO MUX directly. If it's not, you can/have to use the GPIO matrix to route the signal to the IO MUX. TL;DR: IO MUX and GPIO matrix are different things; both are used/set up if/as needed by the IDF's drivers to connect signals to desired pins.

Hi,
Thank you for the explanation.
I understand that we can use any GPIO pin as UART. If ESP32 supports 3 UART that means I cannot able to configure more than 3 UART.
Am I right?