After further trial and error I have managed to get espefuse.py to work. What I had to do was use the following command : python C:\Users\<your-username>\esp\esp-idf\components\esptool_py\esptool\espefuse.py --help Just a reminder this is with release 5.1, your folder structure might be slightly dif...

I have done a clean install of ESP-IDF V5.1 (release version) in VS Code and as far as code building is concerned everything works fine. I have however unfortunately designed a PCB that has GPIO 12 (MTDI) connected to an SD card and flashing the ESP32 is unpredictable because of the VDD_SDIO voltage...

In setup(), you initialise timer0 then start it running. What this will do is call up the onTimer0 ISR. At this point you have still to initialise timer1 as the code in setup() for that has still to be executed. As a result of that the timer1 structure is still set to the NULLs that you initialised ...