> -----Original Message-----
> From: piclist-bounces@mit.edu On Behalf Of Matt Rhys-Roberts
> Sent: Thursday, July 22, 2010 11:01 AM
> 
> Please can someone faimilar with C kindly help clear up my 
> confusion here?
> 
> I'm declaring a couple of SPI function prototypes, see below. Not 
> wishing to waste too much time testing awkward things, shouldn't the 
> common variables (sync_mode, bus_mode etc.) be specified more 
> uniquely for each SPI channel? Will the following, although it 
> compiles ok, cause ambiguity when it comes to execution? I can't 
> tell whether prototyping a function is the same as declaring a 
> variable by name, nor how it's allocating the names following 
> "unsigned char".
> 
> Many thanks,
> Matt
>

The parameter identifiers in a C function prototype are optional and have a
scope limited to the prototype list so, there will be no conflicts or
ambiguity.

More info @ <http://www.ericgiguere.com/articles/ansi-c-summary.html>

Paul Hutch

> 
> 
> void OpenSPI1
> (
> unsigned char sync_mode,
> unsigned char bus_mode,
> unsigned char smp_phase
> );
> unsigned char WriteSPI1(unsigned char data_out );
> 
> void OpenSPI2
> (
> unsigned char sync_mode,
> unsigned char bus_mode,
> unsigned char smp_phase
> );
> unsigned char WriteSPI2(unsigned char data_out );
> 
> void Open1USART
> (
> unsigned char config,
> unsigned int spbrg
> );

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