Arduino串口中断 Demo

serialEvent()作为串口中断回调函数，需要注意的是，这里的中断与硬件中断有所不同，这个回调函数只会在loop()执行完后才会执行，所以在loop()里的程序不能写成阻塞式的，只能写成轮询式的。

/*通过串口控制LED灯的亮灭，输入o开灯，输入f关灯*/
#define  led  13
char led_recv_status  = 0;
bool stringComplete = false;


void setup()
{
   pinMode(led,OUTPUT);
   digitalWrite(led, LOW);
   Serial.begin(115200);
   Serial.println("please select \'o\' or \'f\' to control led:");
}
void loop()
{
  if(stringComplete == true)
  {
     if(led_recv_status  == \'o\')
     {
        digitalWrite(led, HIGH); //led on
        Serial.println("led on");
     }
     else if(led_recv_status  == \'f\')
     {
        digitalWrite(led, LOW); //led off
        Serial.println("led off");
     }
    stringComplete = false;
  }
}


void serialEvent() 
{
  while (Serial.available()) 
  {
    led_recv_status = (char)Serial.read();
    stringComplete = true;
  }
}