>-----Original Message-----
>From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] 
>Sent: 09 August 2006 13:14
>To: piclist@mit.edu
>Subject: 16F877A port input / output problem
>
>
>
>
>I want to have all ports as digital input apart from D which i 
>wasnt as a digital output. Only problem is i dont really know 
>what im doing. I have a fairly healthy knowledge of C but a 
>fairly limited knowledge of PICs
>
>my code so far is;
>
>
>****
>
>// First PIC program
>
>void main()
>{
>  PORTA = 0x00;
>  TRISA = 0x00;
>  PORTB = 0x00;
>  TRISB = 0x00;
>  PORTC = 0x00;
>  TRISC = 0x00;
>  PORTD = 0x00;
>  TRISD = 0x00;
>  PORTE = 0x00;
>  TRISE = 0x00;

To configure port pins as inputs you have to SET the TRIS bits, e.g.

TRISA = 0xFF;  /* all inputs */

All analog pins are switched to analog mode by default, so you need to program ADCON1 to make them digital pins:

ADCON1 = 0x07; /* configure PORTA for digital operation */

Regards

Mike

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