main.cpp

00001 #include "mbed.h"
00002 
00003 InterruptIn mybutton(USER_BUTTON);//generates an object named mybutton out of the class InterruptIn
00004 DigitalOut myled(LED1); //
00005 
00006 volatile float delay = 4.0; // 1 sec of delay in the delay
00007 volatile bool Pressedornot=false; // global variable with is updated by the interrupt function
00008 
00009 /*function pressed() is called than a interrupt is generated by the external interrupt  when the userbutton is pressed
00010 it alters the Pressedornot variable from true to false
00011 */
00012 void pressed()
00013 {
00014     if (Pressedornot==false)
00015         Pressedornot=true;
00016     else
00017         Pressedornot=false;
00018 }
00019 
00020 int main()
00021 {
00022     mybutton.fall(&pressed);//activates the interrupt then a falling edge is detected on the pin
00023     while (1) {
00024         while(Pressedornot==false) {
00025             myled = !myled;
00026             for(int i=0;i<1000000;i++)//
00027              {wait_us(1);
00028              if(Pressedornot==true)
00029              {break;}
00030                  }
00031         } while( Pressedornot==true )
00032          {
00033             myled=true;
00034         }
00035 
00036     }
00037 }