JTAG pins
Some ESP32 devices (e.g. ESP32 C3 and S3) default to JTAG assignment of the IO pins via the IO matrix and the pins won’t work as general IO until you call gpio_reset_pin():
gpio_reset_pin(GPIO_NUM_4); //Remove JTAG default assignmentUSB pins
Some ESP32 devices (e.g. ESP32 S3) default to USB of their IO pins via the IO matrix and the pins won’t work as general IO until you call gpio_reset_pin():
gpio_reset_pin(GPIO_NUM_19); //Remove USB default assignment
gpio_reset_pin(GPIO_NUM_20); //Remove USB default assignment
USEFUL?
We benefit hugely from resources on the web so we decided we should try and give back some of our knowledge and resources to the community by opening up many of our company’s internal notes and libraries through mini sites like this. We hope you find the site helpful.
Please feel free to comment if you can add help to this page or point out issues and solutions you have found, but please note that we do not provide support on this site. If you need help with a problem please use one of the many online forums.