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int latchPin = 3; // 74HC595のST_CPへ
int clockPin = 4; // 74HC595のSH_CPへ
int dataPin = 2; // 74HC595のDSへ
unsigned int val;
unsigned int j;
unsigned int k;
void setup() {
pinMode(latchPin, OUTPUT);
pinMode(clockPin, OUTPUT);
pinMode(dataPin, OUTPUT);
}
void loop() {
// LED1からLED10までを順に光らせます
for (int i = 0; i < 10; i++) {
// 送信中のlatchPinはグランド(LOW)レベル
digitalWrite(latchPin, LOW);
// シフト演算を使って点灯するLEDを選択しています
val = 1<<i;
//MSBFIRST, 74HC595_0_QA-QH->74HC595_1_QA-QB
j = val;
k = val>>8;
shiftOut(dataPin, clockPin, MSBFIRST, k);//上位バイトを送信
shiftOut(dataPin, clockPin, MSBFIRST, j);//2バイトの下位を送信
//LSBFIRST, 74HC595_1_QB-QA->74HC595_0_QH-QA
/*
j = val<<6;
k = val<<6>>8;
shiftOut(dataPin, clockPin, LSBFIRST, j);//2バイトの下位を送信
shiftOut(dataPin, clockPin, LSBFIRST, k);//上位バイトを送信
*/
// 送信終了後latchPinをHIGHにする
digitalWrite(latchPin, HIGH);
delay(100);
}
}
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