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• 開発環境
• Arduinoで動かす
• スイッチでLチカ

// ボードマネージャに追加するボードのパッケージ
//https://github.com/earlephilhower/arduino-pico/releases/download/global/package_rp2040_index.json
//

void led_off() {
  Serial.begin(115200);
  digitalWrite(PIN_LED_R, HIGH);
  digitalWrite(PIN_LED_G, HIGH);
  digitalWrite(PIN_LED_B, HIGH);
}

void setup() {
  // put your setup code here, to run once:
  pinMode(PIN_LED_R, OUTPUT);
  pinMode(PIN_LED_G, OUTPUT);
  pinMode(PIN_LED_B, OUTPUT);
  pinMode(D0, INPUT_PULLUP);
  led_off();
}

static int state = 0;

void loop() {
  if (digitalRead(D0) == LOW) {
    led_off();

    delay(50);
    state++;
    if (state >= 3) {
      state = 0;
    }
    Serial.println(state);

    switch (state) {
      case 0:
        digitalWrite(PIN_LED_R, LOW);
        break;
      case 1:
        digitalWrite(PIN_LED_G, LOW);
        break;
      case 2:
        digitalWrite(PIN_LED_B, LOW);
        break;
      case 3:
        state = 0;
        break;
    }

    while (digitalRead(D0) == LOW)
      ;
    delay(50);
  }
}