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program crash

 
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filjoa



Joined: 04 May 2008
Posts: 260

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program crash
PostPosted: Wed May 01, 2013 12:12 pm     Reply with quote
Hi

I try read from GPS module and write on windows terminal with PIC18F458 @ 20Mhz but program crash after read +-9 strings.
Code:

#include <18F458.h>
#fuses HS,NOWDT,NOPROTECT,NOLVP,BROWNOUT,STVREN
#use delay(clock=20000000)
#use rs232(baud=9600,parity=N,xmit=PIN_C6,rcv=PIN_C7,bits=8, stream=gpsport)
#use rs232(baud=9600,parity=N,xmit=PIN_C4,rcv=PIN_C5,bits=8, stream=outport)

#include<string.h>
#include<stdlib.h>
   
   int1 data_available=FALSE;   
   char c;
   
   void rda_isr();
 
#int_rda
void rda_isr(void)
   {
   c = getc(gpsport);
   data_available=TRUE;
   
   fputc(c,outport);
   }
   

void main(void)
{   
   enable_interrupts(GLOBAL);
   enable_interrupts(INT_RDA);

while(TRUE)
{

}
}

Any idea where stay the problem?

best regards
ezflyr



Joined: 25 Oct 2010
Posts: 1019
Location: Tewksbury, MA

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PostPosted: Wed May 01, 2013 12:15 pm     Reply with quote
Hi,

Modify your #use rs232 line as shown below.

Code:

#use rs232(baud=9600,parity=N,xmit=PIN_C6,rcv=PIN_C7,bits=8, stream=gpsport, Errors)


BTW, your program is probably not 'crashing' in the traditional sense. Rather,
the UART is becoming over-run, and is locking up, preventing other
characters from being received. The addition of 'Errors' to the #use rs232 line
will allow the UART to recover in the event of an over-run.

It's not a good idea to be putting something like your putc inside the serial
ISR. You should be reading characters into a buffer, and then printing them
out in your Main() routine. Looke at the example program ex_sisr.c to see
how this is done!

John
filjoa



Joined: 04 May 2008
Posts: 260

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PostPosted: Wed May 01, 2013 4:56 pm     Reply with quote
Hi

thanks ezflyr

Problem solved, with "ERRORS" add, it make UART reset...

I know this is not correct, but is the 1st test, to start the program.

best regards
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