Route input GPIO to output GPIO via IO Mux or GPIO Matrix?

[meowsqueak]

Somewhat of an academic question: is it possible to use the GPIO Matrix or IO Mux to somehow send an incoming level on an input GPIO to an output GPIO?

I know this is a bit strange - why not just electrically connect the circuit on the output GPIO to the input signal, you may ask - what I'm considering here is directing an incoming signal level (on, say, GPIO 5) to the onboard LED (which is GPIO 2 in my case), so that there is a visual indicator of the signal. I'm using PCNT to count the input signal, and I don't think there's a pass-through output that I can route to GPIO 2. The signal may be fast (up to kHz) so I can't really drive GPIO 2 in software. I could (and do) use an external LED, however the onboard LED is just sitting there so I was wondering if I could drive it in this manner.

Part of this is just my curiosity around the IO Mux & GPIO Matrix and knowing whether this is possible will help my understanding of these subsystems.

[WiFive]

Maybe
https://github.com/espressif/esp-idf/bl ... ram.c#L540

[meowsqueak]

Thanks for that link, it's exactly what I needed to see.

Code: Select all

    // route incoming frequency signal to onboard LED
    gpio_matrix_in(GPIO_FREQ_SIGNAL, SIG_IN_FUNC228_IDX, false);
    gpio_matrix_out(GPIO_LED, SIG_IN_FUNC228_IDX, false, false);

Works perfectly.

[rudi ;-)]

+1
same here - exactly option what i did searched
txs @WiFive for your reminder at this theme.

best wishes
rudi