; Registers TODO: use .def for these!!!!
;   r16: ISR setup (vct) -> timer0_set (main) -> START_BLINK (loop)
;   r17: timer1_set (main) -> timer1_cnt low byte (loop)
;   r18: timer1_set (main) -> timer1_cnt high byte (loop)
;   r19:
;   r20:


.org 0x0000                 ; RESET Vector
    rjmp    main
.org 0x0002                 ; INT0 button interrupt (tap tempo)
    ;rjump tap_tempo --> should have timer0_start --> if timer0_overflow_count=0 start timer (?)
.org 0x0004                 ; TIMER0 overflow
    rjmp timer0_isr
.org 0x0006                 ; TIMER1_COMPA
    rjmp    timer1_isr

.data
    .global timer0_overflow_count
timer0_overflow_count:
    .byte 1

.text
    .global main

#define __SFR_OFFSET 0
#include <avr/io.h>

#include "timer.inc"
#include "tap-tempo.inc"
;#include "midi.inc"

main:
    ldi         r16,        lo8(RAMEND)
    out         SPL,        r0          ; Setup stack pointer LOW
    ldi         r16,        hi8(RAMEND)
    out         SPH,        r0          ; Setup stack pointer HIGH

    ; PB0 is also second button to use as start stop continue with int0 interrupt
    ; when playing one press is pause, another press is continue, a long press is always stop

    cbi         DDRB,       PB1         ; Set EC11 clockwise on PB5 as input
    cbi         DDRB,       PB5         ; Set EC11 counter-clockwise on PB3 as input
    cbi         DDRB,       PB2         ; Set EC11 button (555 square wave) on PB2 as input
    sbi         PORTB,      PB2         ; Enable pull-up on PB2

    ;ldi         r26,        60          ; Default BPM //TODO: save to eeprom not register, on runtime also ldi on r24 register

    ; Setup general registers
    ; 0
    clr     r0
    sts     timer0_overflow_count,  r0

    ; 1
    ldi     r16,    1
    mov     r1,     r16

    rcall       timer0_set
    rcall       timer1_set

    sei                                 ; Enable global interrupt

loop:
    ; led in parallel with midi_out_pin (on a 555 monostable)

    SET_BPM 0x51, 0x29
    ; for ex: use two sram addresses for bpm->lookup table for division

    ; sleep when BPM is stabilized (whenever BPM calculation are not being done) and outside of midi send
    ; to do this explore MCUCR register, it can do a lot of stuff

    rjmp        loop