111 lines
1.6 KiB
NASM
111 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 PINB = 0x03
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.equ DDRB = 0x04
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.equ PORTB = 0x05
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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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ldi r16,0xFF ; config direction ports
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out DDRA,r16
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out DDRB,r16
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; r17 <- 0x01 ; 8 places de chenillard
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LDI R16,0x01
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MOV R17,R16
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boucleA:
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; On affiche l'état courant
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out porta,r17
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call tempo
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; On calcule l'état suivant
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lsl r17
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; si r17 > 0 saut boucleA
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MOV R16,R17
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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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BRLO eti0
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LDI R16,0x01
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RJMP eti1
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eti0:
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CLR R16
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eti1:
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TST R16
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BREQ eti2
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JMP boucleA
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eti2:
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out porta,r17
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; r17 <- 0b10000000
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LDI R16,0b10000000
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MOV R17,R16
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; saut boucleB
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JMP boucleB
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boucleB:
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; On affiche l'état courant
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out portb,r17
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call tempo;
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; On calcule l'état suivant
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lsr r17
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; si r17 > 0 saut boucleB
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MOV R16,R17
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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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BRLO eti3
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LDI R16,0x01
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RJMP eti4
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eti3:
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CLR R16
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eti4:
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TST R16
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BREQ eti5
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JMP boucleB
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eti5:
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out portb,r17
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; r17 <- 0x01
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LDI R16,0x01
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MOV R17,R16
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; saut boucleA
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JMP boucleA
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tempo:
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; On fait une pause
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ldi r24,8
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tempoA:
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subi r22,1
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sbci r23,0
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sbci r24,0
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brcc tempoA
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ret
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