90 lines
1.1 KiB
ArmAsm
90 lines
1.1 KiB
ArmAsm
#include <avr/io.h>
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#include "macro.h"
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.data
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status:
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.byte 0x0
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.text
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.global main_s
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main_s:
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ldi r16, 0x30
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sts DDRB, r16
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ldi r16, (1 << IVCE) ; set vector at address 0x0
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ldi r17, 0
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out IO(MCUCR), r16
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out IO(MCUCR), r17
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ldi r16, 0x3 ; enable falling edge interrupt 0
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sts EICRA, r16
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ldi r16, 0x1 ; external interrupt mask enable
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sts EIMSK, r16
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sei
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again:
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sbi IO(PORTB), 5
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ldi r16, 0x1
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sts status, r16
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wait1:
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ldi r16, 0xff
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ldi r17, 0xff
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ldi r18, 0xff
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1:
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dec r16
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brne 1b
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dec r17
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brne 1b
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dec r18
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brne 1b
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cbi IO(PORTB), 5
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ldi r16, 0x0
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sts status, r16
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wait2:
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ldi r16, 0xff
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ldi r17, 0xff
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ldi r18, 0xff
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1:
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dec r16
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brne 1b
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dec r17
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brne 1b
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dec r18
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brne 1b
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jmp again
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.global int0_handler
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int0_handler:
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ldi r31, 80
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loop:
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dec r31
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brne loop
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lds r31, status
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cpi r31, 1
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brne 1f
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sbi IO(PORTB), 4
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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nop
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cbi IO(PORTB), 4
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1:
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ret
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