PWM_frequency_Arduino_change/PWM_CHANGE_UNO.c at master · fizcris/PWM_frequency_Arduino_change · GitHub

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void setPwmFrequencyUNO(int pin, int divisor) {
  byte mode;
  if(pin == 5 || pin == 6 || pin == 9 || pin == 10) {
    switch(divisor) {
      case 1: mode = 0x01; break;
      case 2: mode = 0x02; break;
      case 3: mode = 0x03; break;
      case 4: mode = 0x04; break;
      case 5: mode = 0x05; break;
      default: return;
    }
    if(pin == 5 || pin == 6) {
      TCCR0B = TCCR0B & 0b11111000 | mode;
    } else {
      TCCR1B = TCCR1B & 0b11111000 | mode;
    }
  } else if(pin == 3 || pin == 11) {
    switch(divisor) {
      case 1: mode = 0x01; break;
      case 2: mode = 0x02; break;
      case 3: mode = 0x03; break;
      case 4: mode = 0x04; break;
      case 5: mode = 0x05; break;
      case 6: mode = 0x06; break;
      case 7: mode = 0x07; break;
      default: return;
    }
    TCCR2B = TCCR2B & 0b11111000 | mode;

}}