Début TP4
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91
TP4/TP41a.txt
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91
TP4/TP41a.txt
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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
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.equ SPL = 0x3D
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.equ UBRR0H = 0x00C5
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.equ UBRR0L = 0x00C4
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.equ UCSR0A = 0x00C0
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.equ UCSR0B = 0x00C1
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.equ UCSR0C = 0x00C2
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.equ UDR0 = 0x00C6
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.equ TCCR0A = 0x24
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.equ TCCR0B = 0x25
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.equ TIMSK0 = 0x6E
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.equ TIFR0 = 0x35
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.def d2 = r19
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.def d1 = r20
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.def d0 = r21
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.def select = r22
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.org 0x0000
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; Vecteur RESET
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jmp debut
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.org 0x002E ; Interruption du timer
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jmp tm
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.org 0x0080
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codeAff: ; Représentation des chiffres sur l'afficheur 7-segments
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.db 0b1111110, 0b001100, 0b0110111, 0b0011111, 0b1001101, 0b1011011, 0b1111011, 0b0001110, 0b1111111, 0b1011111
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debut:
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; initialisation du pointeur de pile
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ldi r28,low(RAMEND)
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ldi r29,high(RAMEND)
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out SPL, r28
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out SPH, r29
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; Ports pour l'afficheur
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DDRA@IO <- 0xFF
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DDRC@IO <- 0xFF
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; Port série 16 MHz 2400 Baud
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UBRR0H <- 3
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UBRR0L <- 64
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UCSR0A <- 0b00000110
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UCSR0B <- 0b00011000
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UCSR0C <- 0b00000110
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; Timer toutes les 2 ms
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TCCR0A@IO <- 0x00
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TCCR0B@IO <- 0x04
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TIMSK0 <- 0x01
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TIFR0 <- 0x01
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; Initialisation des valeurs à envoyer sur le port série
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d2 <- 0
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d1 <- 0
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d0 <- 0
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sei
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boucle:
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; attend qu'un caractère arrive
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si (UCSR0a & 0x80) == 0 saut boucle
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R20 <- UDR0
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d2 <- UDR0 / 100
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d1 <- (UDR0 / 10) % 10
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d0 <- UDR0 % 10
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saut boucle
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tm:
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PortC@IO <- select
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si select = 0b10000000 alors PortA@IO <- codeAff@ROM[d2]
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si select = 0b01000000 alors PortA@IO <- codeAff@ROM[d1]
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si select = 0b00100000 alors PortA@IO <- codeAff@ROM[d0]
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lsl select
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si select = 0 alors select <- 0b00100000
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reti
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