Arduino の digitalWrite だけで有機ELディスプレイ SSD1331 の電源をオン→オフ

ssd1331_on_off.ino

#define sclk 9
#define mosi 10
#define rst  11
#define dc   12
#define cs   13

void initSPI() {
  // Init basic control pins common to all connection types
  pinMode(cs, OUTPUT);
  digitalWrite(cs, HIGH); // deselect（データ送信の時だけ select = LOW にする）
  pinMode(dc, OUTPUT);
  digitalWrite(dc, HIGH); // Data mode

  // sclkとmosiを初期化
  pinMode(mosi, OUTPUT);
  digitalWrite(mosi, LOW);
  pinMode(sclk, OUTPUT);
  digitalWrite(dc, LOW);

  // rstを初期化
  pinMode(rst, OUTPUT);
  digitalWrite(rst, HIGH);
  delay(100);
  digitalWrite(rst, LOW);
  delay(100);
  digitalWrite(rst, HIGH);
  delay(200);
}

// Display on (0xAF)
void displayOn() {
  // display on (0xAF)
  digitalWrite(cs, LOW); // cs start
  digitalWrite(dc, LOW); // command start

  spiWrite16(0xAF);

  digitalWrite(dc, HIGH); // command end
  digitalWrite(cs, HIGH); // cs end
}

// Display off (0xAE)
void displayOff() {
  digitalWrite(cs, LOW); // cs start
  digitalWrite(dc, LOW); // command start

  spiWrite16(0xAE);

  digitalWrite(dc, HIGH); // command end
  digitalWrite(cs, HIGH); // cs end
}

void spiWrite16(uint16_t w) {
  for (uint8_t bit = 0; bit < 16; bit++) {
    if (w & 0x8000)
      digitalWrite(mosi, HIGH);
    else
      digitalWrite(mosi, LOW);
    digitalWrite(sclk, HIGH);
    digitalWrite(sclk, LOW);
    w <<= 1;
  }
}

void setup() {
  delay(1000);

  initSPI();

  displayOn();
  delay(1000);
  displayOff();
  delay(1000);
  displayOn();
  delay(1000);
  displayOff();
}

void loop() {
  // put your main code here, to run repeatedly:
}