Hi List,
   Any person can help in the following C problem please.
I am using PICC with MPLAB to program the PIC16f84A ...the problem is :




void initi()
{
  GIE = 0x00;
  TRISA = 0x10;  // RA4 as input, the rest are output
  TRISB = 0x00; // all output
  PORTB = 0xff;
  PORTA = 0x00;
}

unsigned char Key1()
{
 return 1;
}
.....
.....
 void main()
{

  initi();
  Device = 0x80;
  keySelector = 0x00;
  keyMask = 0x07;
  rData = 0x85;    // test Data


while(RA4) {  PORTA = Key1(); }   //  S1

PORTA = 0xff;     // S2

while(1)
{
   do{
      Receive();
       temp = rData;
       temp &= 0xE0;
       temp = Device - temp;
     }while(temp);

     keySelector = rData & keyMask;

    switch(keySelector)
    {
      case 0x00 : PORTA = Key7();break;
      case 0x01 : PORTA = Key6();break;
      case 0x02 : PORTA = Key5();break;
      case 0x03 : PORTA = Key4();break;
      case 0x04 : PORTA = Key3();break;
      case 0x05 : PORTA = Key2();break;
      case 0x06 : PORTA = Key1();break;
      case 0x07 : PORTA = Key0();break;
    }
  }
}/* End main*/

 Dose  S1 go to infinite loop as long as RA4 = 1 or it will be excuted for
one time and go to S2 ?

thanx in advance.
Regards
Salah.

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