我把x86汇编作为一种业余爱好今年一月,所以我可以做游戏会像在PCJ和坦迪1000,但我发现不完全教多少对特定主题的书旧8086供电的计算机上运行。 虽然一些DOS和BIOS中断那种做的工作,他们是远远不够完善。
我的主要问题是阅读按键键盘状态不停止该程序。 我发现了一些方法,但它们是非常有限的。 INT 21H,AH 0CH读取最后的按键,但在文本版时尚。 它不仅在读一次只有一个键,但记事本般的命中检测使得它无法知道过了多久密钥已经举行。 我也看到到端口60H引用在我的谷歌传播到64小时,但它只是,引用。 实际的解释和工作代码几乎是不存在的。 或者,也许我只是不善于使用搜索引擎。
我需要知道的是一键是否被按下与否。 最佳的解决方案将是使所有的键盘键的缓冲器/阵列和读其状态; 1意味着它的下跌,0意味着它不是。 或者只是有机会获得最后的密钥列表已被击中并释放将是很好(有办法明确,当然该缓冲区)。 任何人都可以点我在正确的方向?
编辑:首先,我应该提到,我使用Borland TASM。 现在我编译你的代码,它的伟大工程和所有,即使我几乎羞于承认,我不明白它的一半。 我试图使其与TASM兼容,但它是所有创造的屏幕和冻结垃圾。
以下是我想出了;
.MODEL TINY
.STACK 256
.DATA
kbdbuf DB 128 DUP (0)
msg1 db "Press and hold ESC", 13, 10, "$"
msg2 db "ESC pressed, release ESC", 13, 10, "$"
msg3 db "ESC released", 13, 10, "$"
.CODE
main PROC
org 0100h
mov ax, @data
mov ds, ax
xor ax, ax
mov es, ax
cli ; update ISR address w/ ints disabled
push word [es:9*4+2] ; preserve ISR address
push word [es:9*4]
lea si, irq1isr
mov word [es:9*4], si ; requires a register
mov [es:9*4+2],cs
sti
mov ah, 9
lea dx, msg1
int 021h ; print "Press and hold ESC"
test1:
mov al, [kbdbuf + 1] ; check Escape key state (Esc scan code = 1)
or al, al
jz test1 ; wait until it's nonzero (pressed/held)
lea dx, msg2
int 021h ; print "ESC pressed, release ESC"
test2:
mov al, [kbdbuf + 1] ; check Escape key state (Esc scan code = 1)
or al, al
jnz test2 ; wait until it's zero (released/not pressed)
lea dx, msg3 ; print "ESC released"
int 021h
cli ; update ISR address w/ ints disabled
pop word [es:9*4] ; restore ISR address
pop word [es:9*4+2]
sti
ret
irq1isr:
push ax bx
; read keyboard scan code
in al, 060h
; update keyboard state
xor bh, bh
mov bl, al
and bl, 07Fh ; bx = scan code
shr al, 7 ; al = 0 if pressed, 1 if released
xor al, 1 ; al = 1 if pressed, 0 if released
mov [cs:bx+kbdbuf], al
; send EOI to XT keyboard
in al, 061h
mov ah, al
or al, 080h
out 061h, al
mov al, ah
out 061h, al
; send EOI to master PIC
mov al, 020h
out 020h, al
pop bx ax
iret
main ENDP
END main
我不知道如果我连编码中断权利。 而赫克,如果我知道如何端口060h的单元 - 064h工作。
Answer 1:
这里是你如何能做到这一点:
; compile with NASM: nasm.exe -f bin kbd.asm -o kbd.com
bits 16
org 0x100
xor ax, ax
mov es, ax
cli ; update ISR address w/ ints disabled
push word [es:9*4+2] ; preserve ISR address
push word [es:9*4]
mov word [es:9*4], irq1isr
mov [es:9*4+2],cs
sti
call test
cli ; update ISR address w/ ints disabled
pop word [es:9*4] ; restore ISR address
pop word [es:9*4+2]
sti
ret
test:
mov ah, 9
mov dx, msg1
int 0x21 ; print "Press and hold ESC"
test1:
mov al, [kbdbuf + 1] ; check Escape key state (Esc scan code = 1)
or al, al
jz test1 ; wait until it's nonzero (pressed/held)
mov dx, msg2
int 0x21 ; print "ESC pressed, release ESC"
test2:
mov al, [kbdbuf + 1] ; check Escape key state (Esc scan code = 1)
or al, al
jnz test2 ; wait until it's zero (released/not pressed)
mov dx, msg3 ; print "ESC released"
int 0x21
ret
irq1isr:
pusha
; read keyboard scan code
in al, 0x60
; update keyboard state
xor bh, bh
mov bl, al
and bl, 0x7F ; bx = scan code
shr al, 7 ; al = 0 if pressed, 1 if released
xor al, 1 ; al = 1 if pressed, 0 if released
mov [cs:bx+kbdbuf], al
; send EOI to XT keyboard
in al, 0x61
mov ah, al
or al, 0x80
out 0x61, al
mov al, ah
out 0x61, al
; send EOI to master PIC
mov al, 0x20
out 0x20, al
popa
iret
kbdbuf:
times 128 db 0
msg1 db "Press and hold ESC", 13, 10, "$"
msg2 db "ESC pressed, release ESC", 13, 10, "$"
msg3 db "ESC released", 13, 10, "$"
在DOS / Win9x的/ NT / 2K / XP / 32位Vista / 7或DOSBox中运行它。
UPDATE:TASM版本:
; file: kbdt.asm
; compile with TASM/TLINK:
; tasm.exe kbdt.asm
; tlink.exe /t kbdt.obj
.286
code segment use16
assume cs:code, ds:code, ss:code
org 100h
main:
xor ax, ax
mov es, ax
cli ; update ISR address w/ ints disabled
push word ptr es:[9*4+2] ; preserve ISR address
push word ptr es:[9*4]
mov word ptr es:[9*4], offset irq1isr
mov es:[9*4+2],cs
sti
call test0
cli ; update ISR address w/ ints disabled
pop word ptr es:[9*4] ; restore ISR address
pop word ptr es:[9*4+2]
sti
ret
test0:
mov ah, 9
mov dx, offset msg1
int 21h ; print "Press and hold ESC"
test1:
mov al, [kbdbuf + 1] ; check Escape key state (Esc scan code = 1)
or al, al
jz test1 ; wait until it's nonzero (pressed/held)
mov dx, offset msg2
int 21h ; print "ESC pressed, release ESC"
test2:
mov al, [kbdbuf + 1] ; check Escape key state (Esc scan code = 1)
or al, al
jnz test2 ; wait until it's zero (released/not pressed)
mov dx, offset msg3 ; print "ESC released"
int 21h
ret
irq1isr:
pusha
; read keyboard scan code
in al, 60h
; update keyboard state
xor bh, bh
mov bl, al
and bl, 7Fh ; bx = scan code
shr al, 7 ; al = 0 if pressed, 1 if released
xor al, 1 ; al = 1 if pressed, 0 if released
mov cs:[bx+kbdbuf], al
; send EOI to XT keyboard
in al, 61h
mov ah, al
or al, 80h
out 61h, al
mov al, ah
out 61h, al
; send EOI to master PIC
mov al, 20h
out 20h, al
popa
iret
kbdbuf db 128 dup (0)
msg1 db "Press and hold ESC", 13, 10, "$"
msg2 db "ESC pressed, release ESC", 13, 10, "$"
msg3 db "ESC released", 13, 10, "$"
code ends
end main
Answer 2:
通常,对于旧系统这样的人所使用的BIOS有点像一个预先提供的一组库函数,那里的东西像键盘功能,如果他们已经方便只使用。 在你的情况下,BIOS键盘服务都不方便,所以你不使用它们。
相反,你想用自己的键盘中断处理程序来取代BIOS键盘中断处理程序和实现自己的键盘驱动程序。 键盘采用IRQ1,这是中断9.中断向量表开始是0x0000:0×0000,所以你会希望在0x0000处获得的4个字节:9 * 4 = 0×0000:0x0024和它们存储的地方(所以你可以把东西回来正常时你的软件出口),并把地址(offset,则自己的键盘IRQ处理程序的段)有来代替。
写自己的键盘驱动程序,你会希望通过了解有2个硬件的参与开始。 有键盘控制器芯片(或“PS / 2控制器”),其中谈到的计算机(通过。串行通信),以键盘本身内的芯片。
对于键盘控制器芯片上的信息,看到类似http://wiki.osdev.org/%228042%22_PS/2_Controller
对于键盘本身内部的芯片上的信息,看到类似http://wiki.osdev.org/PS/2_Keyboard
Answer 3:
使用端口60H和64H端口轮询键盘的实施例:
cli ; stop software-Interrupts
mov al, 2 ; stop IRQ 1
out 21h, al
sti
P1:
in al, 64h ; get Status
test al, 1 ; is there something in the outputbuffer?
jz P1
test al, 20h ; it is a byte from the PS2-Mouse?
jnz P1
in al, 60h ; get a key
cmp al, 1 ; Escape-key?
jz XRAUS ; then goto end
;───────────────────────────────────────────────────────────────
mov si, OFFSET SONTAB ; get the offsetaddress of our special-key table
mov cl, Extablen ; lenght
XSUCH: cmp al, [si]
jz XFOUND
lea si, [si+1] ; instead of "inc si"
dec cl
jnz XSUCH
;───────────────────────────────────────────────────────────────
mov si, OFFSET TASTTAB ; get the offsetaddress of our key table
mov cx, tablen
mov bx, OFFSET TEXTTAB ; our corresponding ASCII table
SUCH: cmp al, [si]
jz short FOUND
lea si, [si+1]
dec cx
jnz SUCH
jmp P1
;───────────────────────────────────────────────────────────────
XRAUS: in al, 60h ; clear outputbuffer
cli
xor al, al ; enable IRQ 1
out 21h, al
sti
mov ah, 1 ; clear buffer in the ram
int 16h
; ...some more instructions
;───────────────────────────────────────────────────────────────
FOUND: mov si, tablen ; Length
sub si, cx
xor ecx, ecx
mov cl, [bx+si] ; get the ASCII from our table
; ...some more instructions
;───────────────────────────────────────────────────────────────
XFOUND:
; Tab,shift li.,shift re.,HOME,UP,LEFT,RIGHT,END,DOWN
cmp cl, 1 ; DOWN-key
jnz short ... ; jump to next
....
....
cmp cl, 9 ; Tab-key
jnz P1
; ...some more instructions
:------------------------Data area----------------------
TASTTAB DB 02h,03h,04h,05h,06h,07h,08h,09h,0Ah,0Bh,0Ch,0Dh
DB 10h,11h,12h,13h,14h,15h,16h,17h,18h,19h,1Ah,1Bh,1Eh,1Fh
DB 20h,21h,22h,23h,24h,25h,26h,27h,28h,29h,2Bh,2Ch,2Dh,2Eh,2Fh
DB 30h,31h,32h,33h,34h,35h,39h
DB 56h
tablen = ($-TASTTAB)
TEXTTAB DB "1234567890ß'" ; with some german letters inside
DB "qwertzuiopü+as"
DB "dfghjklöä^#yxcv"
DB "bnm,.- "
DB "<"
Textablen = ($-TEXTTAB)
;---------------------------------------------------------------------------
; Tab,shift left.,shift rigth.,HOME,UP,LEFT,RIGHT,END,DOWN
;----------
SONTAB DB 0Fh,2Ah,36h,47h,48h,4Bh,4Dh,4Fh,50h
Extablen = ($-SONTAB)
DB 0,0,0 ; for data_alignment of following entries
文章来源: How to check keys status in x86 assembly?