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issue with INT_RDA

 
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suraidaa
Guest
issue with INT_RDA
PostPosted: Wed May 27, 2009 9:52 am     Reply with quote
hi,

i want to send some stuff to a pic with a computer, and it was working, until i tried to do it with interrupts

here is my working code

Code:

#include <16F876A.H>
#fuses HS, NOWDT, NOPROTECT, /*BROWNOUT,*/ PUT, NOLVP
#use delay(clock = 20000000)
#USE RS232(BAUD=9600, XMIT=PIN_c6, RCV=PIN_c7, PARITY= N, bits = 8,errors)

#include <FullCms_Variables.c>
#include <FullCms_LcdDrivers.h>

void main (void)
   {
   char cara;
   int counter=0;
   char reception[] = "-reception-";
   delay_ms(100);
   lcd_init();
   lcd_send_stringc(reception,1);
   lcd_curseur_pos(1,2);
   LCD_curseur_on();
   while(1)
      {
      cara = getc();
      lcd_send_car(cara);
      counter++;
      if(counter ==16)
         {
         lcd_clear();
         lcd_send_stringc(reception,1);
         lcd_curseur_pos(1,2);
         counter =0;
         }
      }
   }


and when i add those line :

just before the main
Code:

#byte RCREG = 0x1A

#INT_RDA
void rda_isr(void)
   {
   RDA_Flag = 1;
   }



just before the LCD_init();

Code:

   enable_interrupts(INT_RDA);
   enable_interrupts(GLOBAL);


my code isn't working anymore

what did i do wrong?

thanks

ps i'm using CCS V4.057
suraidaa
Guest
PostPosted: Wed May 27, 2009 10:29 am     Reply with quote
problem almost solved

i tough that an interrupt was generated each time a data packet was received, but in fact, an interrupt is generated each time the RCREG register is full

since i wasn't reading him inside the interrupt, INT_RDA was ignited each cycle

my new code is :

Code:

#include <16F876A.H>
#fuses HS, NOWDT, NOPROTECT, /*BROWNOUT,*/ PUT, NOLVP
#use delay(clock = 20000000)
#USE RS232(BAUD=9600, XMIT=PIN_c6, RCV=PIN_c7, PARITY= N, bits = 8)

#include <FullCms_LcdDrivers.h>

int RDA_flag = 0;
char cara;

#byte RCREG = 0x1A

#INT_RDA
void com_isr(void)
   {
   RDA_Flag = 1;
   cara = RCREG;
   }

void main (void)
   {
   char cara;
   int counter=0;
   char reception[] = "-reception-";
   
   
   enable_interrupts(INT_RDA);
   enable_interrupts(GLOBAL);

   
   delay_ms(100);
   lcd_init();
   lcd_send_stringc(reception,1);
   lcd_curseur_pos(1,2);
   LCD_curseur_on();
   while(1)
      {
      if (RDA_Flag == 1)
         {
         RDA_Flag = 0;
         Counter++;
         lcd_send_car(cara);
         if (counter == 16)
            {
            counter = 0;
            lcd_clear();
            lcd_send_stringc(reception,1);
            lcd_curseur_pos(1,2);
            }
         }
      }
   }


new issue, cara is containing a weird char insted of what i'm suposed to received
suraidaa
Guest
PostPosted: Wed May 27, 2009 10:58 am     Reply with quote
problem solved^^

i was re-declaring "cara" inside the main, thus there was 0 inside everytime

even if you didn't help me directly, i found all my awnser inside this wonderfull forum

thanks
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