107 lines
1.3 KiB
ArmAsm
107 lines
1.3 KiB
ArmAsm
#include <avr/io.h>
|
|
#include "macro.h"
|
|
|
|
.data
|
|
|
|
status:
|
|
.byte 0x0
|
|
|
|
offset:
|
|
.byte 78
|
|
|
|
.text
|
|
|
|
.global main_s
|
|
main_s:
|
|
ldi r16, 0x30
|
|
sts DDRB, r16
|
|
|
|
ldi r16, (1 << IVCE) ; set vector at address 0x0
|
|
ldi r17, 0
|
|
out IO(MCUCR), r16
|
|
out IO(MCUCR), r17
|
|
|
|
ldi r16, 0x3 ; enable falling edge interrupt 0
|
|
sts EICRA, r16
|
|
|
|
ldi r16, 0x1 ; external interrupt mask enable
|
|
sts EIMSK, r16
|
|
|
|
sei
|
|
|
|
again:
|
|
sbi IO(PORTB), 5
|
|
ldi r16, 0x1
|
|
sts status, r16
|
|
|
|
wait1:
|
|
ldi r16, 0xff
|
|
ldi r17, 0xff
|
|
ldi r18, 0xff
|
|
|
|
1:
|
|
dec r16
|
|
brne 1b
|
|
dec r17
|
|
brne 1b
|
|
dec r18
|
|
brne 1b
|
|
|
|
cbi IO(PORTB), 5
|
|
ldi r16, 0x0
|
|
sts status, r16
|
|
|
|
wait2:
|
|
ldi r16, 0xff
|
|
ldi r17, 0xff
|
|
ldi r18, 0xff
|
|
|
|
1:
|
|
dec r16
|
|
brne 1b
|
|
dec r17
|
|
brne 1b
|
|
dec r18
|
|
brne 1b
|
|
|
|
jmp again
|
|
|
|
.global int0_handler
|
|
int0_handler:
|
|
push r31
|
|
in r31, IO(SREG) ; status register
|
|
push r31
|
|
|
|
lds r31, offset
|
|
dec r31
|
|
cpi r31, 1
|
|
brne 1f
|
|
ldi r31, 78
|
|
1:
|
|
sts offset, r31
|
|
loop:
|
|
dec r31
|
|
brne loop
|
|
|
|
lds r31, status
|
|
cpi r31, 1
|
|
brne 1f
|
|
sbi IO(PORTB), 4
|
|
nop
|
|
nop
|
|
nop
|
|
nop
|
|
nop
|
|
nop
|
|
nop
|
|
nop
|
|
nop
|
|
nop
|
|
cbi IO(PORTB), 4
|
|
1:
|
|
pop r31
|
|
out IO(SREG), r31
|
|
pop r31
|
|
reti
|
|
|