【Arduino工作〜基礎編】Arduinoから柔軟なPWM波形を生成する方法

            #include <avr/io.h>

//👇D10(タイマー1のチャンネルB)を指定
#define PWMOUT 10

unsigned int frq = 440; //周波数[Hz]
float duty = 0.5; //デューティ比50%

void setup() {
    pinMode(PWMOUT, OUTPUT);
    //👇TCCR*A/Bレジスタを直接弄る
    TCCR1A = 0b00100001;//👈D10ピンのPWM(ノン・インバートモード)
    TCCR1B = 0b00010010;//👈分周比8に書き換え
    //👇TOP値を変更
    OCR1A = (unsigned int)(1000000/frq);
    //👇Duty比の設定
    OCR1B = (unsigned int)(1000000/frq*duty);
}

void loop() {}
        

            TCCR1B = 0b00000000;
        

            #include <Arduino.h>

//👇待ち時間200μs
unsigned int waitingTerm = 200;

void setup() {
    pinMode(5, OUTPUT);
}

void loop() {
    digitalWrite(5, HIGH);
    //PORTD |= _BV(5);※後述

    delayMicroseconds(waitingTerm);

    digitalWrite(5, LOW);
    //PORTD &= ~_BV(5);※後述

    delayMicroseconds(waitingTerm);
}
        

            PORTB |= _BV(2); //digitalWrite(10, HIGH);と同じ
PORTB |= _BV(5); //digitalWrite(5, HIGH);と同じ
PORTD |= _BV(5); //digitalWrite(13, HIGH);と同じ
        

            PORTB |= (1 << PB2); //digitalWrite(10, HIGH);と同じ
PORTB |= (1 << PB5); //digitalWrite(5, HIGH);と同じ
PORTD |= (1 << PD5); //digitalWrite(13, HIGH);と同じ
        

            PORTB &= ~_BV(2); //digitalWrite(10, LOW);と同じ
PORTB &= ~_BV(5); //digitalWrite(5, LOW);と同じ
PORTD &= ~_BV(5); //digitalWrite(13, LOW);と同じ
        

            //まとめてHIGH
PORTB |= _BV(2) | _BV(5);
PORTB |= (1 << PB2) | (1 << PB5);

//まとめてLOW
PORTB &= ~(_BV(2) | _BV(5));
PORTB &= ~((1 << PB2) | (1 << PB5));
        

            PORTB |= 0b00010100; //まとめてHIGH
PORTB &= ~0b00010100; //まとめてLOW
PORTB = 0b00010100; //まとめてHIGH・LOW切り替え