ESP8266 NodeMCU入门：使用中断

• 我们将D5口设置为输出PWM波形，使用杜邦线连接D2和D5，并通过中断定时向串口输出内容。

 int pwm_pin = D5;
 int int_pin = D2;
 long count = 0;

 void setup_pwm(){
   analogWriteFreq(500);
   analogWriteRange(100);
 }
 
 ICACHE_RAM_ATTR void trigger(){
     count ++;
     if(count >= 1000){
        count = 0;
        Serial.println("Trigger");   
     }
 }
   
 void setup() {
   Serial.begin(115200);
   setup_pwm();
   attachInterrupt(int_pin,fg_trigger,RISING);
   analogWrite(pwmPin, 50);
 }