--- Andre Miller <andre.miller@BLUERIVER.CO.ZA> wrote:
> 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 = 1;
>
> // Make SCLK low
> SCLK = 0;

Hehe, weird. I had exactly that code, totally
identical, it first, but I seemed too simple :).
Now, I found this in some code of Mike Pearce:

#define bitnum(adr, bit) ((unsigned)(&adr)*8+(bit))

Then I just set: "static bit SCLK bitnum(PORTA, 0)"
and I use SCLK as a single bit.

> 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.

I know that, the pga.h file will be but a small part
of my project. I've also made a mpc.h file, a setup.h
file, an all.c file, ...

The final goal is a full featured digitally controlled
preamp.

Input selection with the BB MPC506, volume control
with the BB PGA2310, VFD for info & menu's, IR remote
control, power switching (to turn amplifiers,
crossover, .. on/off when the preamp is
activated/deactivated), support for as many
3.1,5.1,6.1, ... (you get the point) channels as I
want (that what the volume[pga_chips] array is for),
etc., etc.

As you see I've still got tons of work and heaps of
stuff to learn :). Oh well...

Thanks, Anthony

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


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