M5Stackで音量制御付きtoneのサンプル

m5stack_tone.ino

#include <M5Stack.h>

// toneEx
//  引数 
//   frequency (Hz)
//   vol (0 ～ 9、0:無音 9:最大)
void toneEx(uint16_t frequency, uint16_t vol) {
  ledcSetup(TONE_PIN_CHANNEL, frequency, 10);
  ledcWrite(TONE_PIN_CHANNEL,0x1FF>>(9-vol));
}

// NoToneEx
void noToneEx() {
  ledcWriteTone(TONE_PIN_CHANNEL, 0);
  digitalWrite(SPEAKER_PIN, 0);
}

void setup() {
  M5.begin(true, false, true);
  M5.Power.begin();
  
  ledcSetup(TONE_PIN_CHANNEL, 0, 10);
  ledcAttachPin(SPEAKER_PIN, TONE_PIN_CHANNEL);
  
  Serial.begin(115200);
  M5.Lcd.clear(BLACK);
  M5.Lcd.setTextSize(3);
  M5.Lcd.setCursor(40, 10);
  M5.Lcd.println("Tone example");
}

void loop() {
   M5.update();
  if (M5.BtnA.wasReleased()) {
      toneEx(440,1);
      delay(100);
      noToneEx();
  } else if (M5.BtnB.wasReleased()) {
      toneEx(440,3);
      delay(100);
      noToneEx();
  } else if (M5.BtnC.wasReleased()) {
      toneEx(440,5);
      delay(100);
      noToneEx();
  }
}