lab_2_kovtunoff

;
; lab_2.asm
;
; Created: 07.04.2022 18:29:25
; Author : ferna
;

;PINOUT:
;PD2 - INT0
;LED - PB5
.include "m168padef.inc" ;todo: switch to your MCU

; Replace with your application code
         .CSEG
         .ORG $0000        ; (RESET)
         JMP   init        ;
		 .ORG $0002
		 jmp clr_counter
         .ORG $001A		;switch to your address irq into datasheet
         jmp invert_state   ;

	 	.ORG   INT_VECTORS_SIZE      	; Конец таблицы прерываний
jmp init
start:
nop
nop
jmp start


init:
ldi r16, low(ramend)
ldi r17, high(ramend)
out spl, r16
out sph, r17
sbi ddrb, 5;todo:switch to pb7
sbi portd, 2 ;;pull up state
rcall tim_init
rcall exti_init
sei;enable global interrupts
jmp start

invert_state:
;todo:switch all to pb7
sbis pinb, 5;check for set state, if it's set - skip next cmd
sbi portb, 5
sbic pinb, 5
cbi portb, 5
reti

tim_init:
ldi r16, (1<<CS12);prescale bits 0b100 = 256d
sts TCCR1B, r16
ldi r16, (1<<TOIE1) ;enable interrupts into timers
sts TIMSK1, r16
ret

EXTI_Init:
ldi r16, 0x02
sts EICRA, r16
LDI R16, 0x01
out EIMSK, R16
ret

clr_counter:
ldi r16, 0x00
STS TCNT1L, R16
STS TCNT1H, R16
reti