I’m trying to use WLED with GPIO21 on an ESP32-C3 (specifically the Adafruit QT Py). However, it appears that the pin is always being pulled high. If I use a different pin the LEDs are controlled correctly and there’s an 800KHz signal on that pin. If I select GPIO21 I only measure a ~50Hz signal (likely coupling from the mains). If I select a different pin for the LEDs I can still measure 3.3V on GPIO21.
GPIO21 happens to be the debug TX pin if compiled with -DWLED_DEBUG, but I’m not compiling with that option.