Atomic PWM Base Arduino 使用チュートリアル

#include "M5Unified.h"

#define SIGNAL 5 // PWM signal output pin

int freq        = 10000; // 10kHz
int resolution  = 10;    // Duty cycle resolution in bits (10-bit = 0 to 1023)

void setup() {
    M5.begin();

    M5.Display.setTextColor(GREEN);
    M5.Display.setTextDatum(middle_center);
    M5.Display.setFont(&fonts::Orbitron_Light_24);
    M5.Display.drawString("PWM", M5.Display.width() / 2, M5.Display.height() / 2);

    ledcAttach(SIGNAL, freq, resolution);// Bind the pin, frequency, and resolution
}

void loop() {
    for (int i = 0; i < 500; i++) {
        ledcWrite(SIGNAL, i);// Update the PWM duty cycle
        delay(2);
    }

    for (int i = 500; i > 0; i--) {
        ledcWrite(SIGNAL, i);
        delay(2);
    }
}