ATtiny3224: PWM 出力

PIN_PA5 に 10KHz の PWM出力をします。

プログラム

pwm01/pwm01.ino

// ----------------------------------------------------------------
/*
	pwm01.ino
				Sep/21/2025
*/
// ----------------------------------------------------------------
#define	PROGRAM	"pwm01.ino"
#define	VERSION	"2025-09-21 PM 12:17"

// ----------------------------------------------------------------
#define PWM_PIN PIN_PA5

int icount = 0;
// ----------------------------------------------------------------
void setup() {
	Serial1.begin(19200);
	delay(1000);
	Serial1.println("*** setup start ***");
	delay(1000);
	Serial1.println("*** ATtiny3224 ***");
	Serial1.println(PROGRAM);
        delay(1000);
        Serial1.println(VERSION);
        delay(1000);
	Serial1.print("CPU Clock = ");
	Serial1.print(F_CPU);
	Serial1.println(" Hz");
        delay(1000);

  // PWM ピンを出力に設定
	pinMode(PWM_PIN, OUTPUT);

	uint32_t cmp0 = 8332;

	Serial1.println("cmp0 = " + String(cmp0));
	TCA0.SINGLE.CMP0 = cmp0;

  // タイマーの設定
	TCA0.SINGLE.CTRLB = TCA_SINGLE_CMP0EN_bm | TCA_SINGLE_WGMODE_SINGLESLOPE_gc; // PWMモードを設定
	TCA0.SINGLE.CTRLA = TCA_SINGLE_ENABLE_bm | TCA_SINGLE_CLKSEL_DIV8_gc;
	 // クロックを8で分周


}

// ----------------------------------------------------------------
void loop() {
	int duties[] = {32,64,128};

	for (int it=0; it< 3; it++)
		{
		Serial1.print("*** icount = " + String(icount));
		Serial1.println("\tduty = " + String(duties[it]));
		analogWrite(PWM_PIN, duties[it]);
		delay(1000);
		analogWrite(PWM_PIN, 0);
		delay(1000);
		}


	icount++;
}

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

シリアルの出力

*** setup start ***
*** ATtiny3224 ***
pwm01.ino
2025-09-21 PM 12:17
CPU Clock = 20000000 Hz
cmp0 = 8332
*** icount = 0	duty = 32
*** icount = 0	duty = 64
*** icount = 0	duty = 128
*** icount = 1	duty = 32
*** icount = 1	duty = 64
*** icount = 1	duty = 128

分周比を変えて、周波数を変える方法

text/pwm01/pwm01.ino

// ----------------------------------------------------------------
/*
	pwm01.ino
				Sep/29/2025
*/
// ----------------------------------------------------------------
#define	PROGRAM	"pwm01.ino"
#define	VERSION	"2025-09-29 PM 19:44"

// ----------------------------------------------------------------
#define PWM_PIN PIN_PA5

// ----------------------------------------------------------------
void setup() {
	Serial1.begin(19200);
	delay(500);
	Serial1.println("*** setup start ***");
	Serial1.println("*** ATtiny3224 ***");
	Serial1.println(PROGRAM);
        Serial1.println(VERSION);
	Serial1.print("CPU Clock = ");
	Serial1.print(F_CPU);
	Serial1.println(" Hz");
        delay(500);

  // PWM ピンを出力に設定
	pinMode(PWM_PIN, OUTPUT);

	uint32_t cmp0 = 8332;

	Serial1.println("cmp0 = " + String(cmp0));
	TCA0.SINGLE.CMP0 = cmp0;

  // タイマーの設定
	TCA0.SINGLE.CTRLB = TCA_SINGLE_CMP0EN_bm | TCA_SINGLE_WGMODE_SINGLESLOPE_gc;
 // PWMモードを設定
	TCA0.SINGLE.CTRLA = TCA_SINGLE_ENABLE_bm | TCA_SINGLE_CLKSEL_DIV1024_gc;
}

// ----------------------------------------------------------------
void loop() {
	led_proc(TCA_SINGLE_CLKSEL_DIV4_gc);
	led_proc(TCA_SINGLE_CLKSEL_DIV8_gc);
	led_proc(TCA_SINGLE_CLKSEL_DIV16_gc);
	led_proc(TCA_SINGLE_CLKSEL_DIV64_gc);
	led_proc(TCA_SINGLE_CLKSEL_DIV256_gc);
	led_proc(TCA_SINGLE_CLKSEL_DIV1024_gc);
	delay(1000);
}

// ----------------------------------------------------------------
void led_proc(int div)
{
	Serial1.println(String(div));
	TCA0.SINGLE.CTRLA = TCA_SINGLE_ENABLE_bm | div;
	int duty = 128;
	analogWrite(PWM_PIN, duty);
	delay(1000);
	analogWrite(PWM_PIN, 0);
	delay(1000);
}

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