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RS232 interruptions

 
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filjoa



Joined: 04 May 2008
Posts: 260

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RS232 interruptions
PostPosted: Mon Jun 14, 2010 4:12 pm     Reply with quote
Hi

If my MCU have two usarts I can use two interrutps for protocol Rs232?

My PIC is PIC18F25J11. My idea is use one for a GSM module and other for GPS. Because now I have other PIC with only one USART and I read information from the GSM module for polling and sometimes it fail...

This read from virtual port stay correct?
Code:

fprintf(gsmport,"at\r");
delay_ms(500);
fprintf(gsmport,"at+cmgr=1\r");
delay_ms(100);

while (fgetc(gsmport)!='#');

do {
   sms[i]=fgetc(gsmport);
   i++;
   }while (i<15);

PS: I put "i<15", because my message only have max 9 characters.

best regards
Audi80



Joined: 07 Sep 2007
Posts: 41

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PostPosted: Wed Jun 16, 2010 9:48 am     Reply with quote
You can make two serial interrupt routines like:


Code:
#use rs232(baud=9600, xmit=TX,rcv=RX,BRGH1OK,ENABLE=WR,UART1,STREAM=COMM,BRGH1OK)
#use rs232(baud=9600, xmit=TX2,rcv=RX2,BRGH1OK,ENABLE=WR2,UART2,STREAM=COMM2,BRGH1OK)
char a,b;
#INT_RDA
   void communications(){
        a=fgetc(COMM);
      
   }
#INT_RDA2
   void communications2(){
        b=fgetc(COMM2);
      
   }


And use each one to a single rs232 input...

Hope this helps!
dyeatman



Joined: 06 Sep 2003
Posts: 1933
Location: Norman, OK

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PostPosted: Wed Jun 16, 2010 10:08 am     Reply with quote
A few comments about the USE RS232 declarations:

1. You don't need BRGH10K in the USE RS232 (certainly not twice).
2. Using the UART1 and UART2 declarations you shouldn't need the XMIT and RCV parameters.
3. Unless using half duplex you shouldn't need the ENABLE pin definition.
4. ERRORS needs to be included to prevent a lockup due to receive errors.

The below declarations should be sufficient if using two hardware USARTS:

Code:

#use rs232(baud=9600,UART1,STREAM=COMM. ERRORS)
#use rs232(baud=9600,UART2,STREAM=COMM2, ERRORS)


Read pages 139-141 in the current CCS manual for more information on these.
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