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CCP1-interrupt and RS232-data

 
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jjude
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CCP1-interrupt and RS232-data
PostPosted: Fri Apr 21, 2006 8:04 am     Reply with quote
Sorry bad english!
I measure RPM (tachometer) in CCP1-port falling edge interrupts (and timer1). This work OK, but when RS232 RX-pin comin data at same time,
RMP result is not stabil. I dont read RX-data, but GPS-module sen data every second. RS232 interrupts in disabled.
If i release RX caple, result is stabil.
Whereform result is not stabil?
What i can do?
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Fri Apr 21, 2006 11:36 am     Reply with quote
Quote:
I dont read RX-data.
RS232 interrupts in disabled.
If i release RX caple, result is stabil.

So you don't have any getc() or fgetc() statements in your program ?

If not, then there should be no effect on the program operation
by the incoming RS-232 data.

So in that case, the problem could be electrical noise. Make sure
you have a good power supply and ground for the PIC.
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