Arduino编程之----如何让你Arduino以状态机方式运行

// Pin 13 has an LED connected on most Arduino boards.
// give it a name:
const int led = 13;
const int buttonPin = 2;
volatile int stateFlag = 1;
// the setup routine runs once when you press reset:
void setup()
{
   // initialize the digital pin as an output.
   pinMode(led, OUTPUT);
   pinMode(buttonPin,INPUT);
}
// the loop routine runs over and over again forever:
void loop()
{
   switch (stateFlag)
   {
          case 1:
          digitalWrite(led, HIGH);
          if(digitalRead(buttonPin))stateFlag=2;
          break;
          case 2:
          digitalWrite(led, LOW);
          if(digitalRead(buttonPin))stateFlag=3;
          break;
          case 3:
          LED_Blink(1000);
          if(digitalRead(buttonPin))stateFlag=1;
          break;
          default:
          break;
  }
}
void LED_Blink (unsigned int time_ms)
{
  static unsigned long int n=0;
  static int stateLed = LOW;
  if (millis()-n>=time_ms)
  {
     stateLed=!stateLed;
     digitalWrite(led, stateLed);
     n=millis();
  }
}
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