디바운싱을 이용한 LED 제어

버튼 1 누르면 - 빨간LED켜짐 / 한번 더 누르면 - 꺼짐

버튼 2 누르면 - 연두LED켜짐 / 한번 더 누르면 - 꺼짐

버튼 3 누르면 - 노랑LED켜짐 / 한번 더 누르면 - 꺼짐

 

#include <iostream>
 #include <wiringPi.h>
 #include <unistd.h>
 using namespace std;

 #define LED_GPIO_R      18      // this is GPIO17, pin 11
 #define LED_GPIO_G      13
 #define LED_GPIO_Y      12

 #define BUTTON_GPIO_R   27      // this is GPIO27, pin 13
 #define BUTTON_GPIO_G   17
 #define BUTTON_GPIO_Y   19

 #define DEBOUNCE_TIME 200     // debounce time in ms

 bool x = 0;
 bool y = 0;
 bool z = 0;

 // the Interrupt Service Routine (ISR) to light the LED - debounced
 void lightLED_R(void){
    static unsigned long lastISRTime = 0, x = 1;
    unsigned long currentISRTime = millis();
    if (currentISRTime - lastISRTime > DEBOUNCE_TIME){
      x=!x;
      digitalWrite(LED_GPIO_R,x);         // turn the LED on
     delay(1000);
   }

    lastISRTime = currentISRTime;
 }

 void lightLED_G(void) {
     static unsigned long lastISRTime =0 ,y=1;
     unsigned long currentISRTime = millis();
     if (currentISRTime - lastISRTime > DEBOUNCE_TIME) {
     y=!y;
      digitalWrite(LED_GPIO_G,y);
     delay(1000);
    }
     lastISRTime = currentISRTime;
 }

 void lightLED_Y(void) {
     static unsigned long lastISRTime = 0, z=1;
     unsigned long currentISRTime = millis();
     if (currentISRTime - lastISRTime > DEBOUNCE_TIME) {
      z=!z;
      digitalWrite(LED_GPIO_Y, z);
     delay(1000);
  }
     lastISRTime = currentISRTime;
 }

 int main() {                             // must be run as root

    wiringPiSetupGpio();                  // use the GPIO numbering
    pinMode(LED_GPIO_R, OUTPUT);            // the LED
    pinMode(LED_GPIO_G, OUTPUT);
    pinMode(LED_GPIO_Y, OUTPUT);

    pinMode(BUTTON_GPIO_R, INPUT);
    pinMode(BUTTON_GPIO_G, INPUT);
    pinMode(BUTTON_GPIO_Y, INPUT);          // the Button


     while(1){
    // call the lightLED() ISR on the rising edge (i.e., button press)
    wiringPiISR(BUTTON_GPIO_R, INT_EDGE_RISING, &lightLED_R);
    wiringPiISR(BUTTON_GPIO_G, INT_EDGE_RISING, &lightLED_G);
     wiringPiISR(BUTTON_GPIO_Y, INT_EDGE_RISING, &lightLED_Y);
 }


                             // program ends after 10s
 }