[SOLVED] PIC16f886 Timer0 based interrupt not working

[ragav4456]

Hi

I need PIC16f886 timer based 1 min interrupt occur program.

I tried in hitech c compiler, its not working. 4Mhz osc

#include<htc.h>

__CONFIG(0x20A1);
__CONFIG(0X0700);

unsigned int ivalue=0,Display=0;

void main()
{

    TRISA=0x03;
    PORTA=0x00;
    TRISC=0x07;
    TRISB=0x00;
    PORTB=0x00;
    PORTC=0b00000000;

    T1OSCEN=0;
    ANSEL=0x03;
    ANSELH=0x00;

    OSCCON= 0b01101101;
    OSCTUNE= 0x00;

    GIE=1;
    PEIE=1;
    T0IE=1;
    T0CS=0;
    T0SE=0;
    PSA=0;      // Prescaler assign for Timer0
    PS2=1,PS1=1,PS0=1;
//    OPTION=0X86;
    TMR0=0;
    PIE1=0;
    PIE2=0;

    C1ON=0;     //Comparator1 off
    C2ON=0;     //Comparator2 off
    SSPEN = 0;  //Disable SPI n I2C
  
    while(1)
    {
        PORTB=~PORTB;
        if(ivalue=30)
        {
            RA4=1;
        }
    }
}

void interrupt_isr()
{
    if(T0IF)
    {
        T0IF=0;
        ivalue++;
    }
}

 

[betwixt]

1. change "unsigned int ivalue=0,Display=0;" to:

volatile unsigned int ivalue = 0;
unsigned int Display = 0;

2. change "if(ivalue=30)" to:

if(ivalue == 30)

Brian.

 

[milan.rajik]

Where is timer0 reloaded in ISR ?

---

Code C - [expand]
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void interrupt_isr()
{
    if(T0IF)
    {
    if(++ivalue == 30)
        {
            RA4 = 1;
        }
 
        T0IF=0;
        TMR0H = x;
    TMR0L = y;
    }
}

---

 

[embpic]

you can not create 1 min of timer count but u can count timer interrupt for 1 minute.
means
generate 100ms timer count and count for 10 times and after that use this event.

// timer interrupt after 100 ms 
interrupt void isr()
{
count++;
if(count==10)
{
//use this space for interrupt of 1 minute.
}
}

 

[ragav4456]

Thanks to all,

@ milan.rajik, x and y means?

- - - Updated - - -

Code Not working, what is the reason?

 

[betwixt]

Post the code you have modifed so far so we can see what you are currently working with.

Is it possible for you to use Timer 1 instead of Timer 0? Timer 1 is better for creating longer delays.

Brian.

 

[milan.rajik]

x and y are timer0 reload values. This is mikroC code. Modify it to your Compiler.

---

Code C - [expand]
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//Timer0, 4MHz Fosc
//Prescaler 1:256; TMR0 Preload = 61; Actual Interrupt Time : 49.92 ms
 
//Place/Copy this part in declaration section
void InitTimer0(){
  OPTION_REG = 0x87;
  TMR0 = 61;
  INTCON = 0xA0;
}
 
void Interrupt(){
  if (TMR0IF_bit){
     if(counter == 20)PORTA.F4 = 1;
    //Enter your code here
    TMR0IF_bit = 0;
    TMR0 = 61;
  }
}

---

 

[ragav4456]

Rectify the problem, Problem is declaration of interrupt loop.
void interrupt_isr()

 

[milan.rajik]

The code I posted was mikroC PRO PIC code. I mentioned to modify it to your Compiler.