GPIO Matrix Routing

[DrMickeyLauer]

I'm talking to a peripheral chip via SPI. It also has an INT that is connected to one of my ESP32(S3) GPIOs to signalize certain state changes. In addition to handling the IRQs from this GPIO, can I also wire the GPIO matrix in a way that another GPIO gets set to the inverted level? I have picked up references to the `gpio_matrix` functions, but I'm not sure whether they allow what I'm trying to do.

The net output should be that -- without writing code in the IRQ handler -- a LED gets lit whenever the IRQ line is LOW.

[ok-home]

hi

Yes, it can be done

There is a range of peripheral output signals (208 ~ 212 in Table 6-2) which are not connected to any peripheral, but to the
input signals (208 ~ 212) directly. These can be used to input a signal from one GPIO pin and output directly to another
GPIO pin.

https://www.espressif.com/sites/default ... ual_en.pdf
page 464

[TomAatjes]

Did anyone actually try this?

The following does not work:
gpio_iomux_in(GPIO_BTN, SIG_IN_FUNC_208_IDX);
gpio_iomux_out(GPIO_LED1, SIG_IN_FUNC208_IDX, false);

ESP32-S3 apparently does not have gpio_matrix()

[MicroController]

You may have to manually enable the output for the LED pin after calling gpio_iomux_out(...).