Hi Ed,

In the main() fonction, you may want
     if(RA4 == 0)    instead of     if(RA4 = 0)
Is RA4 an open collector on that PIC? If so do you have a pull-up resistor ?

Hope this helps.
Gaston

Ed Troy wrote:

> I have a very simple application for a pic 16c74b. (Yes, I know it is gross
> overkill, but that is what we are using.) Basically, it is being used to
> program two National Semiconductor synthesizers. They use the standard SPI
> bus, which has a data, a clock, and an enable line. I am using (or at least
> trying to use) RC5 for data, RC3 for clock, and RC2 for low synthesizer
> enable and RC1 for high synthesizer enable. The code seems to do nothing at
> all, in either MPLAB or on the actual board. Basically, nothing toggles or
> does ANYTHING! I am sure I am doing something incredibly stupid, or lacking
> some very simple line of code to set something up, but I can't figure out
> the problem at all. I am attaching a copy of the c code (I used a Hi-Tech
> compiler), but I don't believe there is anything non-standard in the code,
> and the actual hex code that was generated by the Hi-Tech compiler. The
> only error messages I get are not errors but warnings indicating math
> overflow in lines 85, 90, 110, 115, which are SSPBUF=R_RX_LOW,
> SSPBUF=N_RX_LOW, SSPBUF=R_RX_HIGH, and SSPBUF=N_RX_HIGH. It seems
> especially unusual that it gives warnings for those lines, but not other
> lines where SSPBUF is set, which are essentially equivalent.
>
> Any help on where my problem is would be greatly appreciated. As I said,
> this is very simple, and the fact that nothing happens tells me that I am
> just overlooking something very simple.
>
> TIA,
> Ed
>
>   ------------------------------------------------------------------------
>
>    TEST3.HEXName: TEST3.HEX
>             Type: Plain Text (text/plain)
>
>    TEST3.CName: TEST3.C
>           Type: Plain Text (text/plain)

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