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alf-melmac
Joined: 14 Jul 2004 Posts: 3
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16f876a : sw uart dosn't work after new code added |
Posted: Wed Jul 14, 2004 8:44 am |
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Hello friends,
I'm using two sw uarts. the first works, the second too.
After placing some new code lines such these :
fprintf(AUX,"LED%d: GRÜN\n\rLED%d: GRÜN/GELB wechselnd\n\r",kanal*2+1,kanal*2+2);
into the source the received bytes from the second uart (func_modul) are corrupted. (Six byte has to come, only the first is ok.) If I remove the added lines, it work's again.
This are the first statements in the source:
#device *=16
#fuses noprotect,nodebug,nowrt,nocpd,nolvp,nobrownout,put,wdt,xt
#use delay(clock=4000000)
#use RS232 (BAUD = 1200,XMIT = PIN_C5,RCV = PIN_B1,PARITY = N,BITS = 8,BRGH1OK,stream = AUX)
#use RS232 (BAUD = 19200,XMIT = PIN_C7,RCV = PIN_C6,PARITY = N,BITS = 8,BRGH1OK,stream = FUNC_MODUL)
I really don't know whats wrong and I've already lost a lot of time.
May be somebody can help me.
Thanks. |
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Ttelmah Guest
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Re: 16f876a : sw uart dosn't work after new code added |
Posted: Wed Jul 14, 2004 9:11 am |
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alf-melmac wrote: | Hello friends,
I'm using two sw uarts. the first works, the second too.
After placing some new code lines such these :
fprintf(AUX,"LED%d: GRÜN\n\rLED%d: GRÜN/GELB wechselnd\n\r",kanal*2+1,kanal*2+2);
into the source the received bytes from the second uart (func_modul) are corrupted. (Six byte has to come, only the first is ok.) If I remove the added lines, it work's again.
This are the first statements in the source:
#device *=16
#fuses noprotect,nodebug,nowrt,nocpd,nolvp,nobrownout,put,wdt,xt
#use delay(clock=4000000)
#use RS232 (BAUD = 1200,XMIT = PIN_C5,RCV = PIN_B1,PARITY = N,BITS = 8,BRGH1OK,stream = AUX)
#use RS232 (BAUD = 19200,XMIT = PIN_C7,RCV = PIN_C6,PARITY = N,BITS = 8,BRGH1OK,stream = FUNC_MODUL)
I really don't know whats wrong and I've already lost a lot of time.
May be somebody can help me.
Thanks. |
the BRGH setting only applies to the hardware UART.
I have to ask what else you would expect!.
If you are sending something like forty characters out the 'AUX' stream, This involves the processor being occupied doing this for about 32/100ths of a second. During this time, the software receive, cannot work.
You are trying to do more than this design is capable of achieving.
You can only really handle comms in one direction and one stream at a time, when using the software UARTs.
Best Wishes |
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alf-melmac
Joined: 14 Jul 2004 Posts: 3
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Posted: Thu Jul 15, 2004 12:39 am |
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I'm sorry, but may be I'didnt explain my problem correctly.
Ofcause I'm not sending and receiving at the same time !
This is the simplified program :
#use RS232 (BAUD = 1200,XMIT = PIN_C5,RCV = PIN_B1,PARITY = N,BITS = 8,stream = AUX)
#use RS232 (BAUD = 19200,XMIT = PIN_C7,RCV = PIN_C6,PARITY = N,BITS = 8,stream = FUNC_MODUL)
do {
stop_prog_and_wait_for_keystroke();
x=fgetc(FUNC_MODUL); // <- point of problem
if (x == wrong) show_error();
for (...) {
1) stop_prog_and_wait_for_keystroke();
do_something();
fprintf(AUX,......);
2) stop_prog_and_wait_for_keystroke();
do_something();
fprintf(AUX,......);
3) stop_prog_and_wait_for_keystroke();
do_something();
fprintf(AUX,......);
}
} while (1)
My probem :
If I add part 3) into the for-loop, the fgetc(FUNC_MODUL) d'snt work correcly anymore!
I think the increase of source lines changes the behavior of the generated code in "#uses rs232". (jump distance? bank switching ?)
Hope someone can help me. |
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alf-melmac
Joined: 14 Jul 2004 Posts: 3
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Posted: Thu Jul 15, 2004 2:02 am |
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I've got it.
There is a problem with long strings in the compiler:
d'snt work:
fprintf(AUX,"Drehschalter %d rechts:LED%d: GRÜN/links: LED%d: GELB.\n\r\n\r",kanal+1,kanal*2+1,kanal*2+2);
work:
fprintf(AUX,"Drehschalter %d rechts:LED%d: GRÜN/",kanal+1,kanal*2+1);
fprintf(AUX,"links: LED%d: GELB.\n\r\n\r",kanal*2+2);
Ok, let's go on (to the next bug). |
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