ESP32 Forum

I'm trying to use GPIO 39 as an output to drive an LED. I know on the ESP32 WROOM that's not possible, but it should be possible on the ESP32-S2. However, the output remains low.

gpio_set_direction(39, GPIO_MODE_OUTPUT);
gpio_set_level(39, HIGH);

What can I do? Is it conflicting with jtag (since IO39 is shared with the MTCK jtag function)? If so, how do I disable this?

Yes, it probably is configured by default to JTAG. Use gpio_reset() to reconfigure it to a plain old GPIO.

That worked! Many thanks!