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18F6722 RS232 problem

 
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MAKInnovation



Joined: 16 Nov 2010
Posts: 61

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18F6722 RS232 problem
PostPosted: Mon Mar 19, 2012 12:32 am     Reply with quote
Dear Friends;

I am using 18F6722 microcontroller for 2 serial hardware ports.

I have made a simple program but it does not work correctly.
I really don't know the reason why.

Here is my code:
Code:

#include <18F6722.h>
#fuses HS,NOWDT,PROTECT,NOLVP
#use delay(clock=10000000)
#use rs232(baud=9600,parity=N, XMIT=PIN_C6, RCV=PIN_C7,errors,bits=8,stream=s1)
#use rs232(baud=9600,parity=N, XMIT=PIN_G1, RCV=PIN_G2,errors,bits=8,stream=s2)

void main()
{
   while(1)
   {
      fprintf(s1,"Online\r\n");
      fprintf(s2,"Online\r\n");
      delay_ms(1000);
    }
 }
 


And this is the output I received on the terminal. Terminal stops receiving DATA after 2, 3 lines of DATA even if I am sending DATA with continuous loop and no DATA receive after the garbage. DATA..
\0Aine\0D
\0AOnline\0D
\0AOnline\0D
Ê‹«Onliÿ
MAKInnovation



Joined: 16 Nov 2010
Posts: 61

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PostPosted: Mon Mar 19, 2012 2:41 am     Reply with quote

++++++++++++++++++
Spambot post removed. Sorry.

- Forum Moderator
++++++++++++++++++


Thanks;
I have just tried to use only one serial port and it is working fine with single serial port with RS485 IC

have a look:
Code:


#device ICD=TRUE
#fuses HS

#use rs232(baud=9600,parity=N, XMIT=PIN_G1, RCV=PIN_G2,errors,bits=8)

#fuses NOWDT

#use delay(clock=10000000)
//#use rs232(baud=9600,parity=N, XMIT=PIN_C6, RCV=PIN_C7,errors,bits=8,stream=s1)
#use rs232(baud=9600,parity=N, XMIT=PIN_G1, RCV=PIN_G2,errors,bits=8)//,stream=s2)

void main()
{
   //output_high(PIN_G0);
   //output_low(PIN_G0);
   while(1)
   {
      printf("online");
//      fprintf(s1,"Online\r\n");
//      fprintf(s2,"Online\r\n");
      delay_ms(1000);
      output_toggle(PIN_G0);
    }
 }


[/code]
RF_Developer



Joined: 07 Feb 2011
Posts: 839

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PostPosted: Mon Mar 19, 2012 4:42 am     Reply with quote
Try using UART1 and UART2 instead of specifying the pins.

RF Developer
MAKInnovation



Joined: 16 Nov 2010
Posts: 61

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PostPosted: Tue Mar 20, 2012 1:54 am     Reply with quote
Thank you RF for your help.

I made a second hardware with the same controller and the same program is working with it.

There might be something wrong with RS232 IC or its connection in previous card. I am looking for it.

Thanks for everyone who helped me in my simple task.

Regards
Ashraf
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