If all you want to do is set certain output pins high/low you can do =
this
easily in PICC, it has already defined variables for the pins, and it
depends of course which target PIC you're compiling to. Note that
Microchip's C18 compiler uses a different syntax for this (usining a =
union
on the port, I think).

For example:

// Give the output bits some nice names (which I noticed you did, and =
then
commented out)

#define CS RA0          // Chip Select output
#define SCLK RA1                // Serial Clock output
#define SDI RA2         // Serial Data In output

// Make CS high:
CS =3D 1;

// Make SCLK low
SCLK =3D 0;

One thing I did notice is that you didn't set any fuses (configuration =
bits)
in your program, without those, depending on how you're programming your
pic, it most likely won't work, or wont do what you want it to. The =
fuses
set things like osc type (HS, XT), watchdog timers, brownout timers, =
etc.

Also, you are using Port A, and port A usually has special features, =
such as
an A/D, and you need to specifically turn off this functionality =
otherwise
those pins won't behave as expected. Not sure about the specific PIC you =
are
using, but some PIC's have certain Port A pins as input only (is is that
output only?). It might be better to use Port B for testing purposes.

PS, I'm still pretty new to PICs and the C compilers, so I apologize in
advance for any mistakes :-).

  _____ =20

Andr=E9 Miller =09


-----Original Message-----
From: pic microcontroller discussion list =
[mailto:PICLIST@MITVMA.MIT.EDU] On
Behalf Of Anthony Van Herrewege
Sent: 24 March 2004 04:59 PM
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: [PIC:] PGA2310 Control Code


> 5.  Does your C compiler support bit-wide variables?
>  If so, it'd
>     make your code more readable and less error-prone, since you
>     could simply write "SDI =3D 0" or whatever, instead of the
>     complicated logical operations.  If not, "set"
> and "clear"
>     macros would do almost as well.

I had something like that first, but that seemed too simple. I'm using =
the
High-Tech PICC18 demo, but I can't seem to get it to work. I might also =
try
the Microchip C18 compiler demo. I guess they support 1 bit wide vars?

Thanks, Anthony

=3D=3D=3D=3D=3D
Website: http://members.lycos.nl/anthonyvh

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