LED with PIT and INTERRUPT

#include <stdint.h>
#include <stdbool.h>
#include "include/AT91SAM9263.h"


#define DELAY_TIME 100
#define LED1 (1 << 8) //PB8
#define LED2 (1 << 29) //PC29
#define RIGHTCLIC (1 << 4) //PC4
#define LEFTCLIC (1 << 5) //PC5
#define ENABLECLOCK (1 << 4) //change name!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
#define DELAY_IN_SEC (0.001)
#define PIV ( (DELAY_IN_SEC / (160*0.000000001) ) - 1)

bool flag = false;

void TIMER_INT_handler (void){

    if (AT91C_BASE_PITC->PITC_PIMR & AT91C_PITC_PITIEN ){
        flag = true;
        volatile unsigned int clear = AT91C_BASE_PITC->PITC_PIVR;
    }

}

void ConfigureLEDs (void)
{
    *AT91C_PIOB_PER = LED1;
    *AT91C_PIOB_OER = LED1;

    *AT91C_PIOC_PER = LED2;
    *AT91C_PIOC_OER = LED2;

    *AT91C_PIOB_SODR = LED1;
    *AT91C_PIOC_SODR = LED2;

}

void ConfigureButtons (void) {
    //enable peripherial control of both pins
    *AT91C_PIOC_PER = RIGHTCLIC;
    *AT91C_PIOC_PER = LEFTCLIC;

    //disable output, which means that the port works as input
    *AT91C_PIOC_ODR = RIGHTCLIC;
    *AT91C_PIOC_ODR = LEFTCLIC;

    *AT91C_PIOB_PPUER = RIGHTCLIC;
    *AT91C_PIOB_PPUER = LEFTCLIC;

    //enable clock
    *AT91C_PMC_PCER = ENABLECLOCK;

}

void PIT_Init (void) {
    AT91C_BASE_PITC->PITC_PIMR = PIV; // in mode register er set periodic interval value

    AT91C_BASE_AIC->AIC_IDCR = 1 << AT91C_ID_SYS; //disable PIT Timer interrupts
    AT91C_BASE_AIC->AIC_SMR[AT91C_ID_SYS] = (AT91C_AIC_SRCTYPE_INT_LEVEL_SENSITIVE | AT91C_AIC_PRIOR_LOWEST); //configure method of interrupt triggering: level, edge
    AT91C_BASE_AIC->AIC_SVR[AT91C_ID_SYS] = (unsigned int)TIMER_INT_handler;// name for interrupt handler
    AT91C_BASE_AIC->AIC_ICCR =  1 << AT91C_ID_SYS;
    AT91C_BASE_AIC->AIC_IECR =  1 << AT91C_ID_SYS;

    AT91C_BASE_PITC->PITC_PIMR |= AT91C_PITC_PITIEN; // enable PIT interrupt
    volatile unsigned int clear = AT91C_BASE_PITC->PITC_PIVR; //reading the register resets it
}

void PIT_delay_ms (int delay_in_ms ) {
    int counter = 0;
    for(counter; counter < delay_in_ms; counter++) {
        AT91C_BASE_PITC->PITC_PIMR |= AT91C_PITC_PITEN;
        while(!flag){}
        flag = false;
    }
}

void CheckButton (void) {
        if ( *AT91C_PIOC_PDSR == (1 << 4 ) ) {
            *AT91C_PIOC_CODR = LED2;
        }

        if ( *AT91C_PIOC_PDSR == (1 << 5 ) ) {
            *AT91C_PIOC_SODR = LED2;
        }
}



int main(void) {

    ConfigureLEDs();
    ConfigureButtons();
    PIT_Init();
    while(1){

        int counter;
        *AT91C_PIOB_CODR = LED1; //turn on LED1

        for(counter = 0; counter < 100; counter++){
            PIT_delay_ms(10);
            CheckButton();
        }

        *AT91C_PIOB_SODR = LED1; //turn off LED2

        for(counter = 0; counter < 100; counter++){
            PIT_delay_ms(10);
            CheckButton();
        }
    }
}