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#include <xc.h>

#include <plib.h>

#include "defines.h"

#include "TIMER5.h"

static TIMER5_DATA *timer_data_ptr;

void TIMER5_Init(TIMER5_DATA *data, void (*callback)(void), unsigned int time_us) {

    if (data != NULL) // if ptr is null, use existing data

        timer_data_ptr = data;

    timer_data_ptr->callback_function = callback;

    INTDisableInterrupts();

    T5CON = 0x0;

    // PR5 is 16 bits wide, so we need to determine what pre-scaler to use

    int time;

    if (time_us < 13107) {

        time = 5 * time_us;

        T5CONSET = 0x0040;         // Prescaler at 1:16

    } else if (time_us < 26214) {

        time = 2.5 * time_us;

        T5CONSET = 0x0050;         // Prescaler at 1:32

    } else if (time_us < 52428) {

        time = 1.25 * time_us;

        T5CONSET = 0x0060;         // Prescaler at 1:64

    } else { // Minimum time_us of 209712

        time = 0.3125 * time_us;

        T5CONSET = 0x0070;         // Prescaler at 1:256

    }

    Nop();

    TMR5 = 0x0;             // Clear timer register

    PR5 = time;             // Load period register

    IPC5SET = 0x00000011;   // Set priority level = 4, sub-priority level = 1

    IFS0CLR = 0x00100000;   // Clear timer interrupt flag

    IEC0SET = 0x00100000;   // Enable timer interrupt

    INTEnableInterrupts();

}

void TIMER5_Start(void) {

    T5CONSET = 0x8000; // Start timer

}

void TIMER5_Stop(void) {

    T5CONCLR = 0x8000; // Stop timer

}

void __ISR(_TIMER_5_VECTOR, ipl4) __TIMER_5_Interrupt_Handler(void) {

    // Call the saved callback function

    (*timer_data_ptr->callback_function)();

    IFS0CLR = 0x00100000; // Clear the timer interrupt flag

}