On Tue, 15 Feb 2005, Hulatt, Jon wrote:

> However, even without it, my code doesn't work right.
>
> while( *data++ )
> {
>   // Transmit a byte
>   while(BusyUSART());
>   putcUSART(*data);
> }
>
> What the Microchip compiler is doing for that is basically while
> (*(data++)) , so the first char is always missed. My bad. Or is it? I'm
> going to check the text books today to see what the ANSI operator
> precedence should be. I thought that would work.

The problem has nothing to do with operator precedence.  When you
first enter your while loop

while( *data++ )

...you test *data, then increment data.  When you get to
putcUSART(*data), data has already been incremented, and references
the second byte of the string.  I would suggest:

unsigned char ch;

while ((ch = *data++) != 0) {
     while(BusyUSART())
         ;
     putcUSART(ch);
}

This avoids the code size cost of dereferencing the pointer twice.

--
John W. Temples, III
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