PIC16F877A Interrupt Code

During my attempt to program my tachometer, I decided to make things simpler by creating code for an external interrupt, timer 0 interrupt (TMR0), and timer 1 (TMR1) interrupt.  I figured this might be useful to someone in the future, so here it is!

NOTE: I program my code using Sourceboost C complier.

External Interrupt Code on the PIC16F877A

//External Interrupt Test,  

//RoboSlave.Blogspot.com, 1/2011

//Includes

#include <system.h>

//PIC16F877A

#pragma DATA _CONFIG, _PWRTE_OFF & _BODEN_OFF & _WDT_OFF & _LVP_ON & _CPD_OFF & _DEBUG_OFF & _XT_OSC & _CP_OFF

#pragma CLOCK_FREQ 4000000 //Set clock frequency

//Define

#define button1 portb.0

#define led1 portd.0

//Interrupts

void interrupt( void )

{

if( intcon & (1<<INTF) ) //Handle external interrupt

{

clear_bit( intcon, INTF );

led1 = !led1;

}

}

//Main Code

void main( void )

{

trisb = 0x00; //Configure port B

trisd = 0x00; //Configure port D

portb = 0x00; //Initialize port B

portd = 0x00; //Initialize port D

intcon = 0xB0; //Enable interrupts (External, Timer0)

while( 1 ) //Endless loop

{}

}

 Timer0 Interrupt Code on the PIC16F877A

//Timer0 Interrupt Test 

//RoboSlave.Blogspot.com, 1/2011

//Includes

#include <system.h>

//PIC16F877A

#pragma DATA _CONFIG, _PWRTE_OFF & _BODEN_OFF & _WDT_OFF & _LVP_ON & _CPD_OFF & _DEBUG_OFF & _XT_OSC & _CP_OFF

#pragma CLOCK_FREQ 4000000 //Set clock frequency

//Define

#define led1 portd.0

//Interrupts

void interrupt( void )

{

if( intcon & (1<<T0IF) ) //Handle timer0 interrupt

{

clear_bit( intcon, T0IF ); //clear timer 0 interrupt bit

led1 = !led1;

}

}

//Main Code

void main( void )

{

trisd = 0x00; //Configure port D

portd = 0x00; //Initialize port D

intcon = 0xB0; //Enable interrupts (External, Timer0)

//Set Timer0 mode

clear_bit( option_reg, T0CS ); //configure timer0 as a timer

//Set prescaler assignment

clear_bit( option_reg, PSA ); //prescaler is assigned to timer0

//Set prescaler rate

set_bit( option_reg, PS2 ); //prescaler rate 1:128

set_bit( option_reg, PS1 );

set_bit( option_reg, PS0 );

//Set timer0 source edge selection

set_bit( option_reg, T0SE ); //increment on high-to-low transition on RA4/T0CKI pin

while( 1 ) //Endless loop

{}

}

  Timer1 Interrupt Code on the PIC16F877A

//Timer1 Interrupt Test, 

//RoboSlave.Blogspot.com, 1/20111

//Includes

#include <system.h>

//PIC16F877A

#pragma DATA _CONFIG, _PWRTE_OFF & _BODEN_OFF & _WDT_OFF & _LVP_ON & _CPD_OFF & _DEBUG_OFF & _XT_OSC & _CP_OFF

#pragma CLOCK_FREQ 4000000 //Set clock frequency

//Define

#define led1 portd.0

//Interrupts

void interrupt( void )

{

//if( pir1 & (1<<TMR1IF) ) //Handle timer1 interrupt

if (pir1.TMR1IF == 1)

{

clear_bit( pir1, TMR1IF ); //clear timer 1 interrupt bit

led1 = !led1;

}

}

//Main Code

void main( void )

{

trisd = 0x00; //Configure port D

portd = 0x00; //Initialize port D

intcon.GIE = 1;

intcon.PEIE = 1;

pie1.TMR1IE = 1;

t1con= 0b00000001; //set timer1 configs and start

while( 1 ) //Endless loop

{}

}