Aha! Thank you WiFive, your are absolutely correct, that has fixed the crash. It's now mostly working, but I'm getting a sporadic E (28872) rmt: RMT[2] ERR E (28872) rmt: status: 0x13080100 when it's getting a lot of toggling on the rx pin. Are the RMT error codes documented anywhere? Thank you Pete

Hi all, I am trying to use the RMT peripheral to calculate speed from a motors hall sensor (max speed approx 350Hz). I get plausible results if do xRingbufferReceive with ticks_to_wait=portMAX_DELAY, but obviously the latency of my speed calculations are too high. If I change the ticks_to_wait to 10...