RMT pins, how do I know which ones?

[darkgiuseppe]

Hello,

Getting to know the ESP32-S3 better (it's my first ESP32 chip I have ever played with) and getting used to everything. This might sound like a silly question but how do I know which pins are for which RMT channel? I know I can see the constants in my IDE such as RMT_CHANNEL_0 but I am not sure when physical pin it is on the ESP32-S3-DevkitC board. I have seen labeled pins online but I do not see anything labelled as RMT so far.

[ESP_Sprite]

Generally, most peripherals on the ESP32 series do not have dedicated pins. The chip has a GPIO matrix, which means you can effectively route any function to any GPIO pin. Even the pins that *are* indicated, tend to simply be the defaults. (Note that there are exceptions, e.g. SDIO and ADC, which do have dedicated pins, but these peripherals are a minority.)

[darkgiuseppe]

Oh interesting. How do I find out the defaults for the RMT pins? I think I only want to use the GPIO matrix feature if I am stuck in a corner for rework.

[ESP_Sprite]

There are no defaults and there is no way to route RMT that doesn't involve the GPIO matrix. It's generally not a complicated thing, though: if you use ESP-IDF, for instance, you simply tell the RMT driver which pin to use as a parameter in the initialization call.

[darkgiuseppe]

O.o it's like magic lol

Okay thank you for this information.

[Jeevan]

Does it matter which channel we choose?
Also, I tried configuring the gpio through menuconfig but can't seem to navigate it well.
The purpose was to replicate the blink example sketch when they defined CONFIG_GPIO_LED and it was in the sdkconfig.h file with CONFIG_GPIO_LED set to 48(esp32s3).
So I was thinking setting the gpio through menuconfig would produce the same results in my sdkconfig.h file.
Is this right?