汇编8086监听键盘中断 [英] Assembly 8086 listening keyboard interrupt
问题描述
我有与此完全相同的问题:在绘制时监听键盘
I have exactly the same question as this: Listen to keyboard while drawing
但是第一个答案(被接受的答案)仅听键盘一次.因此,我该如何修改我的代码,以便可以监听键盘中断多一遍.
But the first answer (accepted one) listens keyboard for exactly once. So how can I modify my code so that I can listen keyboard interrupt for more then once.
这是我的代码:
.model small
draw_row Macro x
Local l1
; draws a line in row x from col 10 to col 300
MOV AH, 0CH
MOV AL, 4
MOV CX, 0
MOV DX, x
L1: INT 10h
INC CX
CMP CX, 320
JL L1
EndM
.stack 100h
.data
height1 dw 51
width1 dw 65
v1 dw ?
v2 dw ?
CUR_POSX_USER DW 61
CUR_POSY_USER DW 75
VAR DB ?
POSX DW 100
POSY DW 141
CAR_X DW '0','0','0','0','0','0'
CAR_Y DW '0','0','0','0','0','0'
CAR_TIMEM DW '0','0','0','0','0','0'
CAR_TIMES DW '0','0','0','0','0','0'
RANDOM DW 257
TDELAY DW ?
.code
drawcar proc
PUSH AX
MOV V1, CX
MOV AX,WIDTH1
ADD V1,AX
MOV V2, DX
MOV AX,HEIGHT1
ADD V2,AX
POP AX
MOV AH, 0CH
MOV BX,V1
L1:
INC CX
PUSH DX
l2:INT 10H
INC DX
CMP DX,V2
JL L2
POP DX
CMP CX, V1
JL L1
;MOV AH,0
;int 16H
ret
RET
drawcar endp
main proc
MOV AX,@DATA
MOV DS,AX
call drawscreen
INFINITE:
MOV AL,1
MOV CX,CUR_POSX_USER
MOV DX,CUR_POSY_USER
CALL DRAWCAR
CALL DRAW1
CALL LISTEN_KEYBOARD
JMP INFINITE
main endp
DELAY PROC
PUSH AX
PUSH CX
PUSH DX
PUSH BX
PUSH DI
MOV DI, TDELAY
MOV AH, 0
INT 1Ah
MOV BX, DX
GO1:
MOV AH, 0
INT 1Ah
SUB DX, BX
CMP DI, DX
JA GO1
POP DI
POP BX
POP DX
POP CX
POP AX
RET
DELAY ENDP
LISTEN_KEYBOARD PROC
PUSH AX
MOV AH,1
INT 16H
CMP AH,48H
JE UP
CMP AH,50H
JE DOWN
JMP GO
UP:
CMP CUR_POSY_USER,66
JL GO
CALL REMOVECAR
SUB CUR_POSY_USER,66
PUSH CX
PUSH DX
MOV CX,CUR_POSX_USER
MOV DX,CUR_POSY_USER
MOV AL,1
CALL DRAWCAR
POP DX
POP CX
JMP GO
DOWN:
CMP CUR_POSY_USER,133
JG GO
CALL REMOVECAR
ADD CUR_POSY_USER,66
PUSH CX
PUSH DX
MOV CX,CUR_POSX_USER
MOV DX,CUR_POSY_USER
MOV AL,1
CALL DRAWCAR
POP DX
POP CX
JMP GO
GO:
MOV ZF,1
POP AX
RET
LISTEN_KEYBOARD ENDP
REMOVECAR PROC
PUSH CX
PUSH DX
MOV AH,0CH
MOV DX,CUR_POSY_USER
MOV CX,CUR_POSX_USER
CALL DRAWCAR
POP DX
POP CX
RET
REMOVECAR ENDP
drawscreen proc
mov al,13H
mov ah,0h
int 10h
mov ax,10
draw_row 66
draw_row 133
ret
drawscreen endp
DRAW1 PROC
MOV CX,POSX
MOV DX,POSY
MOV AL,0
CALL DRAWCAR
SUB POSX,5
MOV CX,POSX
MOV DX,POSY
MOV AL,15
CALL DRAWCAR
MOV TDELAY,5
CALL DELAY
RET
DRAW1 ENDP
end main
推荐答案
在LISTEN_KEYBOARD过程中,您检查了键盘,但是在比较AH寄存器中的扫描代码之前,您无法解释ZeroFlag.如果设置了ZF,则AH寄存器中没有任何重要意义!
In your LISTEN_KEYBOARD procedure you check the keyboard but you fail to interpret the ZeroFlag before comparing the scancode in the AH register. If the ZF is set then there is nothing of any importance in the AH register!
PUSH AX
MOV AH,1
INT 16H
jz GO Add this line.
CMP AH,48H
JE UP
CMP AH,50H
JE DOWN
JMP GO
在标签GO下方,您已编写MOV ZF,1
.我在您的程序中看不到任何ZF变量.如果要设置ZF,请使用mov ah,40h
sahf
.
Below the label GO you've written MOV ZF,1
. I don't see any variable ZF in your program. If you want to set the ZF then use mov ah,40h
sahf
.
最后一次解决不止一次聆听键盘的问题,您需要真正移除刚刚使用的琴键.
Finally to solve the issue of listening to the keyboard more than once you need to actually remove the key that you've just used.
PUSH AX
MOV AH,1
INT 16H
jz GO
mov ah,0 Add these lines.
int 16h Add these lines.
CMP AH,48H
JE UP
CMP AH,50H
JE DOWN
JMP GO
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