Delay using interrupt

Hello Guys,

I am trying to implement a delay using timer0 interrupt. I’ll just post an abstraction of the code in mikroc

void inittimer()

{

//Timer initialization for a 32ms interrupt

}

void interrupt()

{

//interrupt code;

delayvariable++;

}

void main()

{

TRISB = 0;          //PORTB is output

TRISC.F0 = 1;   //PORTC Pin 0 is input and connected to a switch

if (PORTC.F0 ==0) //check is the button is pressed

{

if (delayvariable==3)   //~100ms second delay to check buttton debounce

{

if (PORTC.F0==0) //check if the button is still pressed

{

PORTB = ~PORTB; //toggle PORTB

delayvariable = 0;  //reset the delay variable

}

}

 

}

}

 

The above code does not work as I expected. Can somebody please point out the mistake I am making or suggest a better way for achieving a 100 ms delay using interrupt?