Timer and PWM issue

[MitchSF]

This works perfectly the first time toneOn() is executed, after that the ISR is never called. I tried disabling all the ledc* functions to see if there was a conflict, with the same result. Is it ok to call timerAlarmDisable() from within the ISR? Thanks in advance.

Code: Select all

byte buzzerPin = 12;
hw_timer_t * toneTimer = NULL;
portMUX_TYPE timerMux = portMUX_INITIALIZER_UNLOCKED;

/*----------------------------------------------------------------------*
  toneOff() ISR
  ----------------------------------------------------------------------*/
void IRAM_ATTR toneOff()  {
  timerAlarmDisable(toneTimer);
  ledcWriteTone(4, 0);
  Serial.println("OFF");
}

void setup() {
  Serial.begin(115200);
  while (!Serial);

  toneTimer = timerBegin(1, 80, true); // initialize timer - timer_id = 1; divider=80; countUp = true;
  timerAttachInterrupt(toneTimer, &toneOff, true); // edge = true
  ledcAttachPin(buzzerPin, 4);
  ledcSetup(4, 2000, 8);
}

void loop() {
  toneOn(50, 40, 1000); // for testing
  delay(2000);
}

void toneOn(byte volume, int dur, int frequency) {
  ledcWriteTone(4, frequency);
  ledcWrite(4, volume);
  timerAlarmWrite(toneTimer, dur * 1000, true); // 1000 per ms
  timerAlarmEnable(toneTimer);
  Serial.println("ON");
}