attachInterrupt

设置中断

语法

 void attachInterrupt(uint8 pin, voidFuncPtr handler, ExtIntTriggerMode mode)"

参数

• pin 引脚编号

• handler 对应的中断函数

• mode 触发中断的模式

• RISING 当 LOW 到 HIGH 时触发中断

• FALLING 当 HIGH 到 LOW 时触发中断

• CHANGE 当 LOW 到 HIGH 或 LOW 到 HIGH 时触发中断

返回值

无

示例

volatile int state = LOW; 
void setup() {
    pinMode(LED_BUILTIN, OUTPUT);
    pinMode(0, INPUT);
    attachInterrupt(0, blink, CHANGE);
}

void loop() {
    digitalWrite(LED_BUILTIN, state);
}

void blink() {
    if (state == HIGH) {
        state = LOW;
    } else { 
        state = HIGH;
    }
}
				

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