//EX3:Button : ON-OFF All output using PIC12F675
//4MHz internal clock
//Oscillator : Internal RC No Clock
//Master Clear Enable : Disable
//Eng:F.Abdelaziz
//Date :03-01-2013*/

void init_port(void)
{
ANSEL = 0x00;         //set port as digital I/O , not analog input
ADCON0 = 0x00;      //shut off the A/D converter(default)
CMCON = 0x07;       //shut off the comparator
VRCON = 0x00;        //shut off the voltage reference(default)
TRISIO = 0x08;         // 0b001000  = GP3 bit only as input
GPIO = 0x00;            //make all pins low "0"
}

bit oldstate;              // Old state flag
void main() {
init_port();
oldstate = 0;
  do {
    if (Button(&GPIO, 3, 20, 1)) {  // Detect logical one ie pressed button
      oldstate = 1;                // Update flag
    }
    if (oldstate && Button(&GPIO, 3,20, 0)) {
      // Detect one-to-zero transition ie press then release
      GPIO = ~GPIO;               // Invert GPIO
      oldstate = 0;               // Update flag
    }                     // beginning of a repeat loop
  }  while(1);           // endless loop
}