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12f629 RS232

 
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gdl_pro1
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12f629 RS232
PostPosted: Thu Mar 01, 2007 11:53 am     Reply with quote
Hi Guys. I have 2 days stuck trying to get RS232 comunication with the 12f629.

My compiler version is 5.00.2195.6601 and I'm using a MAX232.
I'm sure that the hardware is working because I'm also making a code for the 16f877 and It works fine with it. Both the terminal and the code are set to baud=2400, parity=N,bits=8,hardware. By the way, before using the 12f629 for the first time, I saved the OSCAL, I have compared it and has not changed.

I get the correct number of bytes but they are corrupted. exaple, the pic should send 0x42 but gets 0xE2

By the way, I downloaded a demo version of a competitors compiler and the RS232 worked, so that means it is not hardare. So it reduces the posibility to a code error or a compiler error. I cannot use the competitors compiler since I have all code of all the projects in the CCS compiler.

I will apreciate if anybody can take a look at the code. Maybe you will have an opportunity to tell me how stupid I'm Very Happy

Thanks in advance
Code:
#if defined(__PCM__)
#include <12f629.h>
#fuses INTRC_IO,NOWDT,NOPROTECT,PUT,NOMCLR
#use delay(clock=4000000)
#use rs232(baud=9600, parity=N, xmit=PIN_A2, RCV=PIN_A3, bits=8,RESTART_WDT)


void main()
{
 
   int16 i;    
   int8 D;
   setup_comparator(NC_NC_NC_NC);
   

   //Blink a LED to be sure that the pic start
   output_high(PIN_A4);
   delay_ms(400);
   output_low(PIN_A4);
   delay_ms(400);
   output_high(PIN_A4);
   delay_ms(400);
   output_low(PIN_A4);
   delay_ms(400);
   output_high(PIN_A4);
   delay_ms(400);
   output_low(PIN_A4);
   delay_ms(400);
   printf("HELLO");
   putchar(0X42);
   while(1)    
   {
      if (kbhit() )   
      {      
         putchar(0X42);
         D = getchar(); // wait for command char       
         putchar(D);

         if ( D == 'b' )    
         {
            putchar(0X55); // return test values
            delay_ms(16);
            putchar(0XAA);
         }
         D=0;
      }
   }
}
Guest
PostPosted: Thu Mar 01, 2007 12:10 pm     Reply with quote
Quote:
Both the terminal and the code are set to baud=2400
Code:
#use rs232(baud=9600, parity=N, xmit=PIN_A2, RCV=PIN_A3, bits=8,RESTART_WDT)
gdl_pro1
Guest
PostPosted: Thu Mar 01, 2007 12:22 pm     Reply with quote
Ooops. Yes you are right. I have been working with seral options of bauds, parity, reverse, ect. to try to make it work. without any luck

Actual code (same as terminal).
Code:
#use rs232(baud=2400, parity=N, xmit=PIN_A2, RCV=PIN_A3, bits=8)
Guest
PostPosted: Thu Mar 01, 2007 12:27 pm     Reply with quote
You have the RESTART_WDT option enabled in the #use rs232 statement, but have the watchdog timer disabled with the NOWDT fuse. Try remvoing the RESTART_WDT option.
gdl_pro1
Guest
PostPosted: Thu Mar 01, 2007 12:32 pm     Reply with quote
By the way, the correct version of the compiler is "Version 3.107, 15848" The version that I posted before was from the help file.
gdl_pro1
Guest
PostPosted: Thu Mar 01, 2007 12:38 pm     Reply with quote
Thanks I removed it, same issue only trash in Terminal
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Thu Mar 01, 2007 2:11 pm     Reply with quote
Your version doesn't support the 12F629 very well. The CCS start-up
code is incorrect, and the code for the setup_comparator() function is
incorrect. Change the first part of your program so it looks like this,
and it may start working.
Code:

#include <12F629.h>
#fuses INTRC_IO,NOWDT,NOPROTECT,PUT,NOMCLR
#use delay(clock=4000000)
#use rs232(baud=9600, xmit=PIN_A2, RCV=PIN_A3)

#byte OSCCAL = 0x90
#byte CMCON = 0x19

// If you erased the OSCCAL value, then un-comment this line.
// #rom 0x3FF = {0x3480}   

//======================
void main()
{
int8 D;

#asm
call  0x3FF    // Read the OSCCAL value
movwf OSCCAL   // Load it
#endasm

CMCON = 7;   // Comparator off

gdl_pro1
Guest
PostPosted: Thu Mar 01, 2007 3:02 pm     Reply with quote
It woooooorks!!!!

Thank you. I would had never figured it out myself.

Now I can stay with CCS.
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