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Using R6 and R7 for I/O and Serial UART?

 
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Using R6 and R7 for I/O and Serial UART?
PostPosted: Fri Dec 02, 2005 10:43 am     Reply with quote
Hi,
I am using the #use rs232 function with the hardware uart on a PIC18F series. However I can't then use output_low(PIN_C7) to drive pin c7 low. I only need to use the rs232 a certain parts of the program. I seem to remember a way to switch the #use directive on/off as required? Can't find it in the manual. Any ideas?
TTelmah
Guest
PostPosted: Fri Dec 02, 2005 11:24 am     Reply with quote
I think the easiest for what you describe, would be just to turn the peripheral off. So:
Code:

#bit SPEN=0xFAB.7

//Then to use the RS232:
SPEN=TRUE;
printf("TEST");

//Then to set C7 low
SPEN=FALSE;
output_low(PIN_C7);


The problem is that the peripheral enable, overrides the pin's output drive, so though the output is still 'commanded', the peripheal override prevents the pin from being driven.

Best Wishes
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