delay in pic c (12f675)

[srikanthind]

hi everyone, could someone help me out pls. I am new to pic c, am writing a small writing to check the delay and interrupts. but, it showing error for delay and interrupt is not working. i tried with for loop as well, but after for loop, the instruction is going to interrupt.

could some one tell me where have i done wrong.
the code is like below:

#include<pic.h>
#include<htc.h>
//#include <delay.h>

int i;

void interrupt Isr(void)

{
  if (GPIF)

   { 
        if(GPIO3==0)
          GPIO=0B001111111;
   }
   GPIF=0;
} 
    

void main(void)
{
  ANSEL = 0b00000000;
	OPTION = 0b11010001;
	CMCON = 0b00000000;
    TRISIO= 0B00001000;

     GIE = 1;
	T0IE = 1;
	T0IF = 0;
    GPIF=0;
  IOCB=GPIO3;
      
  //GPIO=0B00000100;

  Delay(50);

for(i=0; i<5000;i++)
{
}

for(i=0; i<50000;i++);

  GPIO=GREEN;                   

      while(1)
       {}
             
}

[MODNOTE]Please use the "#" code tag[/MODNOTE]

 

[Ian Rogers]

You use the built in delay routines

Add

#define __XTAL_FREQ 4000000 // or what speed your crystal is

At the top of you code ( below the includes )


Then you can access

__delay_ms(int);
__delay_us(int);

 

[srikanthind]

thank you mate..
_delay is working but, _delay_ms(); is not working. ( am using pic 12f675)

and is there any maximum number we can use as int. bcz it showing error after certain number..

thank you

You use the built in delay routines

Add

#define __XTAL_FREQ 4000000 // or what speed your crystal is

At the top of you code ( below the includes )


Then you can access

__delay_ms(int);
__delay_us(int);

 

[Ian Rogers]

Did you use TWO underscores..

_ _delay_ms(); I know it looks like one..... There are two before XTAL as well.

 

[srikanthind]

i used 2 underscores now, no errors now but delay is not working..

 

[Ian Rogers]

Show me your code!!! I'll take a looksee...

 

[srikanthind]

#include<pic.h>
#include<htc.h>

#define __XTAL_FREQ 4000000
//#include <delay.h>


#define GREEN 0b00000110


void interrupt Isr(void)

{
  if (GPIF)

   { 
        if(GPIO3==0)

          GPIO=0B001111111;

   }
   GPIF=0;


} 
    

void main(void)
{

  ANSEL = 0b00000000;
	OPTION = 0b11010001;
	CMCON = 0b00000000;
    TRISIO= 0B00001000;

     GIE = 1;
	//T0IE = 1;
	T0IF = 0;
    GPIF=0;
    IOCB=GPIO3; 
      
  //GPIO=0B00000100;

  __delay_ms(5);

  __delay_us(50);

  __delay_ms(200);

GPIO |= (1<<5);
GPIO &= ~(1<<7);
  GPIO=GREEN;                   

      while(1)
       {}
             
}

Show me your code!!! I'll take a looksee...

 

[Ian Rogers]

#include<htc.h>
#define _XTAL_FREQ 4000000
__CONFIG(0x31C4);
 
#define GREEN 0b00000110

void interrupt Isr(void) 
	{
	if (GPIF)
		{ 
        if(GPIO3==0)
			GPIO=0B001111111;
		}
	GPIF=0;
	} 

void main(void)
	{
	ANSEL = 0b00000000;
	OPTION_REG = 0b11010001;
	CMCON = 0b00000000;
	TRISIO= 0B00001000;
	GIE = 1;
	//T0IE = 1;
	T0IF = 0;
    GPIF=0;
    IOCB=GPIO3; 
	//GPIO=0B00000100;
	__delay_ms(5);
	__delay_us(50);
	 __delay_ms(200);
 
	GPIO |= (1<<5);
	GPIO &= ~(1<<7);
	GPIO=GREEN;                   
	while(1)
       {}
 	}

Works fine.... Sorry there is one underscore before XTAL... You forgot the config....

htc.h calls pic.h so there is no need to include it...

The interrupt isn't working because its not switched on.. When swithed on it fires every 32μS... Is that what you wanted???

 

[srikanthind]

I turned it on using toie=1, but still not working and i need the interrupt when the button pressed.

Thank you

#include<htc.h>
#define _xtal_freq 4000000
__config(0x31c4);
 
#define green 0b00000110

void interrupt isr(void) 
	{
	if (gpif)
		{ 
        if(gpio3==0)
			gpio=0b001111111;
		}
	gpif=0;
	} 

void main(void)
	{
	ansel = 0b00000000;
	option_reg = 0b11010001;
	cmcon = 0b00000000;
	trisio= 0b00001000;
	gie = 1;
	//t0ie = 1;
	t0if = 0;
    gpif=0;
    iocb=gpio3; 
	//gpio=0b00000100;
	__delay_ms(5);
	__delay_us(50);
	 __delay_ms(200);
 
	gpio |= (1<<5);
	gpio &= ~(1<<7);
	gpio=green;                   
	while(1)
       {}
 	}

works fine.... Sorry there is one underscore before xtal... You forgot the config....

Htc.h calls pic.h so there is no need to include it...

The interrupt isn't working because its not switched on.. When swithed on it fires every 32μs... Is that what you wanted???

 

[Ian Rogers]

What pin is the button on?????

Is it on pin3 ???


ALSO you have to read the GPIO port so the flag will clear..

You need to look at the timer interrupt... Is way too fast for any thing else to occur.... Either slow it down or turn it off.

This line IOCB = GPIO3... isn't good

Just IOC3 = 1 is good.