#include <xc.h>                                     //PIC hardware mapping
#include<pic16f1829.h>
#define _XTAL_FREQ 500000                            //Used by the XC8 delay_ms(x) macro
//totale stap cycle van 256 stappen duurt 8 seconde elke stap duurt dus 32 miliseconde elke instrucite duurt  0,008 mili seconde 32/0,008 = 4000 stappen nodig maar de timer heeft maar 255 stappen dus gebruik maken van post of pre scalar.dus een scalar van 1:16.
#define vertraging32 60500 //= 32000 (milisec) / 16 (want prescalar = 1:2 en 65536 (2^16) - 2000 = 63536)

//config bits that are part-specific for the PIC16F1829
#pragma config FOSC=INTOSC, WDTE=OFF, PWRTE=OFF, MCLRE=OFF, CP=OFF, CPD=OFF, BOREN=ON, CLKOUTEN=OFF, IESO=ON, FCMEN=ON
#pragma config WRT=OFF, PLLEN=OFF, STVREN=OFF,BORV = LO, LVP=OFF

const unsigned short PWM_Lookup[] = {
    0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6,
    6,
    7,
    8,
    9,
    9,
    10,
    11,
    12,
    13,
    14,
    15,
    16,
    17,
    18,
    19,
    20,
    21,
    22,
    23,
    25,
    26,
    27,
    29,
    30,
    31,
    33,
    34,
    36,
    37,
    39,
    40,
    42,
    44,
    45,
    47,
    49,
    51,
    52,
    54,
    56,
    58,
    60,
    62,
    64,
    66,
    68,
    70,
    72,
    74,
    77,
    79,
    81,
    83,
    86,
    88,
    90,
    93,
    95,
    98,
    100,
    103,
    105,
    108,
    111,
    113,
    116,
    119,
    121,
    124,
    127,
    130,
    133,
    136,
    139,
    141,
    144,
    148,
    151,
    154,
    157,
    160,
    163,
    166,
    170,
    173,
    176,
    180,
    183,
    186,
    190,
    193,
    197,
    200,
    204,
    208,
    211,
    215,
    219,
    222,
    226,
    230,
    234,
    238,
    241,
    245,
    249,
    253,
    257,
    261,
    265,
    269,
    274,
    278,
    282,
    286,
    290,
    295,
    299,
    303,
    308,
    312,
    317,
    321,
    326,
    330,
    335,
    339,
    344,
    349,
    353,
    358,
    363,
    368,
    373,
    377,
    382,
    387,
    392,
    397,
    402,
    407,
    412,
    417,
    423,
    428,
    433,
    438,
    444,
    449,
    454,
    460,
    465,
    470,
    476,
    481,
    487,
    492,
    498,
    504,
    509,
    515,
    521,
    526,
    532,
    538,
    544,
    550,
    556,
    561,
    567,
    573,
    579,
    586,
    592,
    598,
    604,
    610,
    616,
    623,
    629,
    635,
    641,
    648,
    654,
    661,
    667,
    674,
    680,
    687,
    693,
    700,
    707,
    713,
    720,
    727,
    734,
    740,
    747,
    754,
    761,
    768,
    775,
    782,
    789,
    796,
    803,
    810,
    817,
    825,
    832,
    839,
    846,
    854,
    861,
    868,
    876,
    883,
    891,
    898,
    906,
    913,
    921,
    928,
    936,
    944,
    952,
    959,
    967,
    975,
    983,
    991,
    999,
    1007,
    1014,
    1023,
};

typedef enum {
    dim,
    fel,
    noppes
} knop;

unsigned int index = 0;
volatile knop vroeger = dim;
volatile knop nu = noppes;

void init(void) {
    //setup clock
    OSCCON = 0b00111000; //500KHz clock speed
    //set up leds
    TRISC = 0; //all LED pins are outputs
    LATC = 0;
    //set up button
    TRISAbits.TRISA2 = 1; //switch as input
    ANSELAbits.ANSA2 = 0; //digital switch

    //setup the PWM
    CCP2CON = 0b00001100; //PWM mode single output
    PR2 = 255; //Frequency at 486Hz. Anything over ~60Hz will get rid of any flicker
    //PWM Period = [PR2 + 1]*4*Tosc*T2CKPS = [255 + 1] * 4 * (1 / 500KHz) * 1
    CCPTMRSbits.C2TSEL = 0b00; //select timer2 as PWM source
    T2CONbits.T2CKPS = 0b00; //1:1 prescaler
    T2CONbits.TMR2ON = 1; //start the PWM

    //setup TIMER1 as the delay
    T1CON = 0x10; // Fosc/4, prescaler 1:2, tmr1 of
    T1CONbits.TMR1ON = 1;
    //1:256 prescaler for a delay of: (insruction-cycle * 256-counts)*prescaler = ((8uS * 256)*256) =~ 524mS

    TMR1IE = 1;
    PIE1bits.TMR1IE = 1; //enable the TMR4 rollover interrupt
    PIR1bits.TMR1IF = 0;
    //setup interrupt on change for the switch
    INTCONbits.IOCIE = 1; //enable interrupt on change global
    IOCANbits.IOCAN2 = 1; //when SW1 is pressed, enter the ISR
    IOCAPbits.IOCAP2 = 1;
    IOCAFbits.IOCAF2 = 1;



    PEIE = 1;
    GIE = 1; //enable global interupt
}

void __interrupt() ISR() {
    if (PORTAbits.RA2 == 0 && IOCAFbits.IOCAF2 == 1) {
        IOCAFbits.IOCAF2 = 0; //flag = clear
        if (vroeger == dim) {
            vroeger = fel;
            nu = fel;
        } else {
            vroeger = dim;
            nu = dim;
        }
    } else if (PORTAbits.RA2 == 1 && IOCAFbits.IOCAF2 == 1) {
        IOCAFbits.IOCAF2 = 0;
        nu = noppes;
    }

    if (PIR1bits.TMR1IF == 1) {
        PIR1bits.TMR1IF = 0;
        TMR1 += vertraging32;

        switch (nu) {
            case noppes:
                break;

            case dim:
                if (index > 0) {
                    index--;
                }
                break;

            case fel:
                if (index < 255) {
                    index++;
                }
                break;
        }
    }

    CCPR2L = ((PWM_Lookup[index] >> 2) & 0xFF);
    CCP2CONbits.DC2B = ((PWM_Lookup[index] >> 8) & 0x03);
}

void main() {
    init();

    while (1) {

    }


}