RE: Resets from unknown reason

SteveHx — Wed, 25 Sep 2024 01:17:08 GMT

Thank you for the very quick response. The PWM data is definitely in RAM, being updated fairly often. I'm guessing it must also be 32-bit aligned, so that will be my next line of attack.

RE: Resets from unknown reason

hmolesworth — Tue, 24 Sep 2024 23:57:00 GMT

Unofficial, but in case a quick response helps: the memory location may be incompatible which can cause a CPU lock-up:

static nrf_pwm_values_individual_t PWM_DigitTable[] = {0, 1, 2, 3};
   // This works:
   pNRF_PWM->SEQ[0].PTR = (uint32_t)PWM_DigitTable;

static const nrf_pwm_values_individual_t PWM_DigitTable[] = {0, 1, 2, 3};
   // This generates a hard fault or cpu lockup:
   pNRF_PWM->SEQ[0].PTR = (uint32_t)PWM_DigitTable;

PWM data must reside in RAM not FLASH.

The "soft reset" is a software reset, perhaps caused by the PWM error but also issued, for example, when setting modes in SystemInit():

// Generate a soft reset
NVIC_SystemReset();