The megaavr_slow_pwm from khoih-prog

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This library enables you to use ISR-based PWM channels on Arduino megaAVR boards, such as UNO WiFi Rev2, AVR_Nano_Every, etc., to create and output PWM any GPIO pin. It now supports 16 ISR-based PWM channels, while consuming only 1 Hardware Timer. PWM channel interval can be very long (ulong microsecs / millisecs). The most important feature is they're ISR-based PWM channels, supporting lower PWM frequencies with suitable accuracy. Their executions are not blocked by bad-behaving functions or tasks. This important feature is absolutely necessary for mission-critical tasks. These ISR-based PWMs, still work even if other software functions are blocking. Moreover, they are much more precise (certainly depending on clock frequency accuracy) than other software-based PWM using millis() or micros(). That's necessary if you need to control devices requiring high precision. Now supporting MegaCoreX.

License: MIT License

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Minimal example for running PWM with custom frequency

Hi,

I am quite new to arduino and need to run PWM with a custom frequency on a pin in a precisely timed fashion at a slow frequency (30/100Hz) on an arduino nano every in an experimental setup (I work in a neuroscience lab).

I guess this toolbox could help doing so, I am however a bit confused by the provided examples which are relatively complex.

I for instance managed to do something similar on an arduino uno using the Arduino PWM Frequency Library (which is unfortunately not compatible with arduino nano every). Using this library, I was for instance able to run PWM at 100Hz with a duty cycle of 50% on pin 3 using:

#include <PWM.h>
#define PIN_PWM 3
int32_t FREQUENCY = 100;  // frequency, Hz
byte DUTY_CYCLE = 128; // 0-255, 128 corresponds to a 50% duty cycle

void setup(){
  InitTimersSafe();
  bool success = SetPinFrequencySafe(PIN_PWM, FREQUENCY);
  pinMode(PIN_PWM, OUTPUT);
}

void loop(){
  // Start PWM on PIN_PWM
  pwmWrite(PIN_PWM, DUTY_CYCLE);
  delay(1000);
  // Stop PWM on PIN_PWM
  digitalWrite(PIN_PWM, LOW);
  delay(1000);
}

Would it be possible to provide a similar minimal example for setting up the frequency/duty cycle and running/stopping PWM on a given pin ? Or did I misunderstand the purpose of this library and should I use a different one ?

Thanks !

rfayat

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Minimal example for running PWM with custom frequency

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