92 lines
1.6 KiB
NASM
92 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 PINC = 0x06
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.equ DDRC = 0x07
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.equ PORTC = 0x08
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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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.def compteur = r20
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.def seg = r21
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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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afficheur:
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.DB 0x7E, 0x0C, 0x37, 0x9F, 0x4D, 0xDB, 0xFB, 0x0E, 0xFF, 0xDF
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;.DB 0x7E, 0x30, 0x6D, 0x79, 0x33, 0x5B, 0x5F, 0x70, 0x7F, 0x7B
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; 0, 1, 2, 3, 4, 5, 6, 7, 8, 9
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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 DDRC,r16
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ldi r16,0x40 ; On sélectionne l'afficheur du millieu
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out PORTC,r16
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; compteur <- 0
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LDI R16,0
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STS compteur,R16
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boucle:
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; On affiche compteur sur le 7 segments
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; seg <- afficheur@ROM[compteur]
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LDS R16,compteur
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LDI R30,low(afficheur<<1)
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LDI R31,high(afficheur<<1)
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CLR R17
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ADD R30,R16
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ADC R31,R17
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LPM R16,Z
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STS seg,R16
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out porta,seg
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; On incrémente compteur
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inc compteur
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; si compteur > 9 alors compteur <- 0
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LDS R16,compteur
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PUSH R16
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LDI R16,9
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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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LDI R16,0
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STS compteur,R16
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eti2:
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; On attend et on recommence
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call tempo
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; saut boucle
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JMP boucle
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tempo:
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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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