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serial comm with ext interrupt dont work?

 
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sarikayamusa



Joined: 17 Jun 2005
Posts: 1

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serial comm with ext interrupt dont work?
PostPosted: Fri Mar 28, 2008 1:56 am     Reply with quote
Hi everyone.
I'm working for RF remote dimmer project. But doesnt work true. Problem is: later a few receiving serial data, disabled ext interrupt?
i want to set in ext_int routine with that i received serial time data.

Code is below:

Receiver:

Code:

#include <12f675.h>

#FUSES intrc_io,NOMCLR,nowdt
#use delay(clock=4000000)
#use rs232(baud=1200,rcv=PIN_A5)

signed int16 gecikme;

#define triac   PIN_A4
#define led     PIN_A0

#BIT INTF=0x0B.1
#BIT INTEDG=0x81.6

//*****************************************************************************
#int_Ext
void isr()
{
 
  if (gecikme>=0 && gecikme<=10000) 
  {
   output_low(triac);
   delay_us (gecikme);
   output_high(triac);
   delay_us(300); 
   output_low(triac);
  }
 
  INTEDG=!INTEDG;
  INTF=0;
  //clear_interrupt(INT_EXT);
}
//******************************************************************************
 //         #byte OSCCAL = 0x90   
 //         #rom 0x3ff = {0x3470}


void main()
{   

// if i disable interrupts no problem serial comm.

enable_interrupts(GLOBAL);
enable_interrupts(int_ext); 
 
   for(;;)
   {
                 
         if(kbhit())
         {
          disable_interrupts(global);    // if any data in, disable interrupt
         
           
           if(getc()=='A' && getc()=='C') { gecikme=100;  enable_interrupts(global); }
           if(getc()=='K' && getc()=='P') { gecikme=9900; enable_interrupts(global); } 
         }
           
          enable_interrupts(global);      // if there isnt serial data, enable interrupt     
     
    }
}



Transmitter:

Code:

#include <12F675.h>
#fuses intrc_IO,NOWDT,nomclr,put  //dikkat
#use delay (clock=4000000)
#use rs232(baud=1200,xmit=PIN_A2)


#define BUTON1  PIN_A1
#define BUTON2  PIN_A0

void main()

     {   
      do
      {
     
       if(!input(BUTON2))
        {     output_high(pin_a1);
              printf("AC");
               delay_ms(150);
             
         }
         
        if(!input(BUTON1))
        {      output_low(pin_a1);
               printf("KP");
               delay_ms(150);
        }
     }while(true);
  }





if i disable interrupts, serial comm. working true but if enable, sometimes, ext int disabled. And serial comm doest work true?

Why doesent work my code? Help...

Thanks.
Matro
Guest
PostPosted: Fri Mar 28, 2008 2:31 am     Reply with quote
These 2 lines
Code:

if(getc()=='A' && getc()=='C') { gecikme=100;  enable_interrupts(global); }
if(getc()=='K' && getc()=='P') { gecikme=9900; enable_interrupts(global); }

are "dangerous" because once a getc() has been performed, the next one will wait till a new character is received.
So to enable interrupt again there is only a few solutions (x is any character) :
'A', 'C'
x, x, 'K', 'P'
x, x, x, x

ONLY these character series will re-enable the int_ext.
Is that the behavior you want?

Matro.
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