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



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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