;
; Zadatak1.asm
;
; Created: 9.12.2018. 20:08:56
; Author : Maja Vrsaljko
;

.def tmp = r16
.def counter = r17
.def step = r18

.cseg
    rjmp reset


reset:
    ldi tmp, high(RAMEND)
    out SPH, tmp
    ldi tmp, low(RAMEND)
    out SPL, tmp

    ldi tmp, (1 << PD5)//pinovi
    out DDRD, tmp

    ldi tmp, (1 << 0) | ( 1 << 1) //tipkice
    out PORTB, tmp

    ldi tmp, 0x00
    out DDRB, tmp

    //fiksini 8-bitni fast pwm /8 pres
    ldi tmp, (1 << COM1A0) | (1 << COM1A1) | (1 << WGM10)
    out TCCR1A, tmp

    ldi tmp, (1 << CS11) | (1 << WGM12)
    out TCCR1B, tmp

    ldi tmp, high(200)
    out OCR1AH, tmp
    ldi tmp, low(200)
    out OCR1AL, tmp

    ldi step, 0x05

main:
    sbis PINB, 0
        rcall inc_int
    sbis PINB, 1
        rcall dec_int
rjmp main

inc_int:
    ldi tmp, 0xfa //250
    in counter, OCR1AL
    cpse counter, tmp
        add counter, step

    out OCR1AL, step
ret

dec_int:
    ldi tmp, 0x00
    in counter, OCR1AL
    cpse counter, tmp
        sub counter, step

    out OCR1AL, step
ret