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Wrong compiler function if not defining "xmit="?

 
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Wrong compiler function if not defining "xmit="?
PostPosted: Sat Nov 29, 2008 3:54 am     Reply with quote
Wrong compiler function if not defining "xmit="?


Ex1. This will generate right code.
Code:
#use rs232(baud=9600,xmit=PIN_A5,rcv=PIN_A4)


Ex2. This will generate _wrong_ code!
Code:
#use rs232(baud=9600,rcv=PIN_A4)


If only using the "xmit" and _not_ the "rcw" there are no problem?

Compiler (PCH) V_4.074
Ttelmah
Guest
PostPosted: Sat Nov 29, 2008 4:00 am     Reply with quote
This is completely normal.
_If_ you only select one pin, the compiler will assume you deliberately want to use a _software_ UART, and generate the code for this.
Do a search here. I have posted in the past, how to turn off half the UART, if you only want to use one hardware pin.

Best Wishes
Guest
PostPosted: Sat Nov 29, 2008 8:21 am     Reply with quote
Hi

If looking at the generated code, i think it,s wrong!
Code:
#use rs232(baud=9600,rcv=PIN_A4)


Code:
0050:  BSF    STATUS.RP0
0051:  BCF    TRISIO.TRISIO0
0052:  BCF    STATUS.RP0
0053:  BCF    GPIO.GP0 <----This will clear GP0 and it's not defined???
0054:  MOVLW  08
0055:  MOVWF  @21
0056:  GOTO   057
........


But the workaround is define both pin and only use one, thanks.
Ttelmah
Guest
PostPosted: Sat Nov 29, 2008 8:46 am     Reply with quote
Problem is I see no suggestion that this is the generated code for the RS232 line...
You need to give us something to work on:
1) What processor.
2) A_minimum_ compilable program that shows the fault. Normally just the processor include, fuses, clock settings, RS232 declaration, and a couple of lines, showing some serial I/O, to show where this code is actually being generated.
You say the compiler is PCH, but the code shown, looks to be PCM code.

Best Wishes
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