85 lines
1.6 KiB
NASM
85 lines
1.6 KiB
NASM
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.equ PINA = 0x00 ; définition des adresses des ports
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.equ DDRA = 0x01
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.equ PORTA = 0x02
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.equ WDTCSR = 0x60
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.equ RAMEND = 0x21FF
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.equ SPH = 0x3E ; initialisation de la pile
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.equ SPL = 0x3D
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.org 0x000
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; Vecteur RESET
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jmp debut
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.org 0x0080
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debut:
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; DDRA@IO <- 0x01 ; Configuration du port pour mettre la LED en sortie et le bouton en entrée
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LDI R16,0x01
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OUT DDRA,R16
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attend:
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; On reste là si le bouton n'est pas appuyé
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; si (PINA@IO & 0x02) == 0 saut attend
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IN R16,PINA
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ANDI R16,0x02
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PUSH R16
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LDI R16,0
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POP R17
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CP R17,R16
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BREQ eti0
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CLR R16
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RJMP eti1
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eti0:
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LDI R16,0x01
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eti1:
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TST R16
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BREQ eti2
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JMP attend
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eti2:
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; Dès que le bouton est appuyé
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cli ; Activation du chien de garde en mode RESET
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; WDTCSR <- 0b00010000 ; Autorise la modification du chien de garde
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LDI R16,0b00010000
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STS WDTCSR,R16
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; WDTCSR <- 0b00001110 ; Reset le programme après 1 seconde
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LDI R16,0b00001110
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STS WDTCSR,R16
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sei
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; PORTA@IO <- 0x01 ; On allume la LED
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LDI R16,0x01
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OUT PORTA,R16
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boucle:
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; On reste ici en attendant que le watchdog arrive à expiration si le bouton est relâché
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; si (PINA@IO & 0x02) = 0 saut boucle
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IN R16,PINA
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ANDI R16,0x02
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PUSH R16
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LDI R16,0
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POP R17
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CP R17,R16
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BREQ eti3
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CLR R16
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RJMP eti4
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eti3:
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LDI R16,0x01
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eti4:
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TST R16
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BREQ eti5
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JMP boucle
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eti5:
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wdr ; Sinon si le bouton est appuyé on bloque le watchdog à 1s
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jmp boucle
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