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Interrupt for RB6(pin 27) of 16f913

 
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deepakomanna



Joined: 06 Mar 2007
Posts: 92
Location: Pune,India

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Interrupt for RB6(pin 27) of 16f913
PostPosted: Sat Dec 15, 2007 3:28 am     Reply with quote
Dear Sir,
here i am using 16f913, MPLAB 7.5 Ver. & CCS PCM C Compiler, Version 3.249, 34534.
i want to use IOC only for RB6 pin 27 for this my defined statements are,
Code:
/*********************************/
read_port = input_a(); 
clear_interrupt(INT_RB);
enable_interrupts(INT_RB);

/*************************************/

But i checked header file,Only defined statement is
Quote:
#define INT_RB 0x0B08

So if i want to enable interrupt only for RB6,how should i define ?
Actually To this pin i have connected a push button switch,So if i pressed the switch, the interrupt will follow
IOC isr.In this isr i am clearing all EEPROM LOcations.My defined statements are,
Code:
#int_rb
void ioc_isr(void)
{
int8 read_port,clear_ee;
delay_us(10);
for(clear_ee = 0; clear_ee>=255;clear_ee++)
   write_eeprom(clear_ee,0);
read_port = input_b(); 
}


awaiting for your reply
_________________
Thank You,
With Best Regards,
Deepak.
Ttelmah
Guest
PostPosted: Sat Dec 15, 2007 6:09 am     Reply with quote
First comment. You should tweak your interrupt code a little:
Code:

#int_rb
void ioc_isr(void) {
   int8 read_port,clear_ee;
   //Why delay?. - the code itself takes about 1 second... delay_us(10);
   read_port=input_b();
   if ((read_port & 0b01000000) ==0) {
      for(clear_ee = 0; clear_ee>=255;clear_ee++)
         write_eeprom(clear_ee,0);
   }
   //The problem is that the 'changed' interrupt, will trigger on both edges
   //of the signal on the pin, and also the signal may change several times
   //(bounce). Hence you need to ensure that the code is only called on
   //one edge - I check for the _falling_ edge (assuming you have a
   //pullup, and a switch to ground. Unless you can be _absolutely_ sure
   // the button will be released before the code is complete, you need
   //this extra test.
   read_port=input_b(); //extra read here, will ensure the above does
   //happen, if the button _has_ released.
}

In your main 'setup' code, you don't show the]
'enable_interrupts(GLOBAL)' statement. This too is needed.
Now, on later compilers, the other piece of setup, is available 'pre done', but on your version, you need:

Code:

#byte IOCB=0x96

IOCB=0b01000000; //enable changed interrupt on B6 only
read_port=input_a();
clear_interrupt(INT_RB);
enable_interrupts(INT_RB);
enable_interrupts(GLOBAL);



Best Wishes
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