ESP32: LEDの制御 (PWM)

こちらのページを参考にしました。
LED Control (LEDC)

8個のLED の明るさを変化させます。

プログラム

ledc_ex01.ino

// ---------------------------------------------------------------------
//	ledc_ex01.ino
//
//						Aug/19/2024
// ---------------------------------------------------------------------
// use 12 bit precision for LEDC timer
#define LEDC_TIMER_12_BIT 12

// use 5000 Hz as a LEDC base frequency
#define LEDC_BASE_FREQ 5000

int ledpins[8] = {32,33,25,26,27,14,12,13};

// define starting duty, target duty and maximum fade time
#define LEDC_START_DUTY  (0)
#define LEDC_TARGET_DUTY (4095)
#define LEDC_FADE_TIME   (3000)

bool fade_ended = false;  // status of LED fade
bool fade_on = true;

void ARDUINO_ISR_ATTR LED_FADE_ISR() {
  fade_ended = true;
}

int icount = 0;
// ---------------------------------------------------------------------
void setup() {
	Serial.begin(115200);
	while (!Serial) {
		delay(10);
	}

Serial.println("*** setup *** aaa ***");

	// Setup timer with given frequency, resolution and attach it to a led pin with auto-selected channel

for (int it=0; it<8; it++)
	{
	ledcAttach(ledpins[it], LEDC_BASE_FREQ, LEDC_TIMER_12_BIT);
	}

	// Setup and start fade on led (duty from 0 to 4095)
for (int it=0; it<8; it++)
	{
	ledcFade(ledpins[it], LEDC_START_DUTY, LEDC_TARGET_DUTY, LEDC_FADE_TIME);
}

	Serial.println("LED Fade on started.");

	// Wait for fade to end
	delay(LEDC_FADE_TIME);

	// Setup and start fade off led and use ISR (duty from 4095 to 0)
for (int it=0; it<8; it++)
	{
	ledcFadeWithInterrupt(ledpins[it], LEDC_TARGET_DUTY, LEDC_START_DUTY, LEDC_FADE_TIME, LED_FADE_ISR);
}

	Serial.println("LED Fade off started.");
}

// ---------------------------------------------------------------------
void loop() {
	delay(2000);
	// Check if fade_ended flag was set to true in ISR
	if (fade_ended) {
		Serial.print("LED fade ended icoount = ");
		Serial.println(icount);
		icount++;
		fade_ended = false;

		// Check if last fade was fade on
		if (fade_on) {
			for (int it=0; it<8; it++)
			{
			ledcFadeWithInterrupt(ledpins[it], LEDC_START_DUTY, LEDC_TARGET_DUTY, LEDC_FADE_TIME, LED_FADE_ISR);
			}

			Serial.println("LED Fade off started. loop");
			fade_on = false;
		} else {
		for (int it=0; it<8; it++)
			{
			ledcFadeWithInterrupt(ledpins[it], LEDC_TARGET_DUTY, LEDC_START_DUTY, LEDC_FADE_TIME, LED_FADE_ISR);
			}

			Serial.println("LED Fade on started. loop");
			fade_on = true;
		}
	}
}

// ---------------------------------------------------------------------