You will also need to set up the tris registers.  This sets the direction of 
data on your I/O lines.  Setting an individual TRIS bit to zero creates an 
output pin, a 1 would create an input pin. Other than that you are on the 
right track.


--Lawrence Lile
Project Solutions Engineering
www.projsolco.com



>From: "ecollins" <ecollins@txc.com>
>Reply-To: "Microcontroller discussion list - Public." <piclist@mit.edu>
>To: <piclist@mit.edu>
>Subject: [PIC] 12f508 help needed
>Date: Tue, 22 Feb 2005 17:24:43 -0500
>
>Help! I am trying to program a 12f508 using C2C+.  I am not an expert but 
>not a beginner either.  I have experience programming 16f84 as well as 
>16f72.  I am used to writing to "porta" or "trisb" but the 12f508 
>apparantly uses a register called "gpio" and "tris".  I have read the data 
>sheet and I am still confused on how to control these ports.  I do not know 
>assembly language.  Here is my code snippet:
>
>unsigned char gpio@0x06 ;
>
>void main (void)
>{
>    gpio = 0xff ;
>}
>
>this compiles successfully and assembles successfully. but when I load the 
>hex file into mplab and step through, the gpio register doesn't change.  By 
>the way, I am using 12c508.inc which is selected as menu option in the C2C+ 
>program.  Thanks for any help.
>-ethan
>--
>http://www.piclist.com PIC/SX FAQ & list archive
>View/change your membership options at
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