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a2: bearbeitet während Praktikum

This commit is contained in:
Johannes Theiner 2018-10-25 11:26:51 +02:00
parent 44a382990b
commit c96245788f
1 changed files with 29 additions and 5 deletions
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34
src/a2.asm
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@ -18,15 +18,39 @@
;E=01111001=79 ;E=01111001=79
;F=01110001=71 ;F=01110001=71
INPUT equ 0h
LED equ 0h
SEGM equ 90h
; 0 1 2 3 4 5 6 7 8 9 A B C D E F
SEG db 0x3F, 0x6, 0x5B, 0x4F, 0x66, 0x6D, 0x7D, 0x7, 0x7F, 0x6F, 0x77, 0xFF, 0x39, 0xBF, 0x79, 0x71 ; 0 1 2 3 4 5 6 7 8 9 A B C D E F
segtext db 0x3F, 0x6, 0x5B, 0x4F, 0x66, 0x6D, 0x7D, 0x7, 0x7F, 0x6F, 0x77, 0xFF, 0x39, 0xBF, 0x79, 0x71
res db 0x0
jmp WDH jmp WDH
WDH: in ax, INPUT
mov res, ax
and ax, 00001111b;get second nibble
out LED, ax;debug, output to leds
push ax;write result to stack
WDH: in ax, 0
out 90h, ax mov ax, res
out 0, ax mov cl, 4
shr ax, cl;shift right 4 times
and ax, 00001111b;might not be needed
out LED, ax;debug, output to leds
push ax;write result to stack
pop ax;get from stack
pop bx;get from stack
sub ax, bx
out LED, ax;output to led
out SEGM, al;output to seven segment display
jmp WDH jmp WDH