When the program starts, if RA4 is any non-zero value, the code in that
while loop ("S1") will be repeatedly executed.
When RA4 == 0, then it will exit the while loop and continue to "S2".

----- Original Message -----
From: "Salah" <salah@HUGLE.CO.JP>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Tuesday, December 18, 2001 9:12 PM
Subject: [PIC]: The Ghost overthere came here


> 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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>
>

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