Arduino串口中斷 Demo

serialEvent()作為串口中斷回調函數，需要注意的是，這里的中斷與硬件中斷有所不同，這個回調函數只會在loop()執行完后才會執行，所以在loop()里的程序不能寫成阻塞式的，只能寫成輪詢式的。

/*通過串口控制LED燈的亮滅，輸入o開燈，輸入f關燈*/
#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;
  }
}