ToughC5 Buzzer 蜂鸣器

#include <M5Unified.h>

static constexpr auto BUZZER_GPIO = m5::M5PM1_Class::gpio4;
static constexpr auto BUZZER_PWM = m5::M5PM1_Class::pwm_ch1;

static void playTone(uint16_t frequency, uint16_t duration)
{
  auto& pm1 = M5.Power.M5pm1;
  if (!pm1.setPwmFrequency(frequency) ||
      !pm1.setPwmDuty12bit(BUZZER_PWM, 2048,
                           m5::pwm_polarity_t::normal, true)) {
    return;
  }

  delay(duration);
  pm1.setPwmDuty12bit(BUZZER_PWM, 0, m5::pwm_polarity_t::normal, false);
  delay(50);
}

void setup()
{
  M5.begin();
  M5.Display.setRotation(1);
  M5.Display.setFont(&fonts::DejaVu24);
  M5.Display.drawString("ToughC5 Buzzer", M5.Display.width() / 2,
                        M5.Display.height() / 2);

  auto& pm1 = M5.Power.M5pm1;
  if (!pm1.setGPIOFunction(BUZZER_GPIO, m5::M5PM1_Class::special)) {
    M5.Display.clear();
    M5.Display.println("M5PM1 setup failed");
    while (true) {
      delay(1000);
    }
  }
}

void loop()
{
  playTone(880, 500);
  playTone(990, 500);
  playTone(1120, 500);
  playTone(1180, 500);
  playTone(1320, 500);
  playTone(1480, 500);
  playTone(1650, 500);
  playTone(1760, 500);
  delay(500);
}