Thanks for the reply. I found the problem was due to a rmt_write_items(...) statement in the interrupt. It would always execute the first time through the interrupt and then fail the second time through. Replacing it with bit banging works. Do you know of any issues with the RMT in interrupts? My RM...

I have a timer interrupt that causes a "Guru Meditation Error: Core 0 panic'ed (Interrupt wdt timeout on CPU0) "..... Core 0 was running in ISR context: I am trying to port the Grbl CNC firmware to ESP32. The timer is used to handle step pulse timing. The steps can occur at more than 30kHz. I can ge...