文件kbdc.c:
#include <stdio.h>
extern void SetNewIrq9Isr(void);
extern void RestoreOldIrq9Isr(void);
#define SCAN_BUF_SIZE 1024
extern volatile unsigned char ScanBuf[SCAN_BUF_SIZE];
extern volatile unsigned ScanReadIdx;
extern volatile unsigned ScanWriteIdx;
const char ScanToChar[] =
"??1234567890-=??"
"QWERTYUIOP[]??AS"
"DFGHJKL;\"`?\\ZXCV"
"BNM,./??? ";
int IsScanCodeAvailable(void)
{
return ((ScanWriteIdx - ScanReadIdx) & (SCAN_BUF_SIZE - 1)) != 0;
}
unsigned char GetScanCode(void)
{
unsigned char code;
while (!IsScanCodeAvailable());
code = ScanBuf[ScanReadIdx];
ScanReadIdx++;
ScanReadIdx &= SCAN_BUF_SIZE - 1;
return code;
}
int main(void)
{
SetNewIrq9Isr();
printf("Press keys to see scan codes.\nPress ESC to exit.\n");
for (;;)
{
unsigned code, symbol;
code = GetScanCode();
symbol = code & 0x7F;
symbol = (symbol < sizeof(ScanToChar)) ? ScanToChar[symbol] : '?';
printf("scan code: 0x%02X, symbol: \"%c\"\n", code, (char)symbol);
if (code == 1)
{
break;
}
}
RestoreOldIrq9Isr();
return 0;
}
文件kbda.asm:
GLOBAL _SetNewIrq9Isr, _RestoreOldIrq9Isr
GLOBAL _ScanBuf, _ScanReadIdx, _ScanWriteIdx
SEGMENT _TEXT PUBLIC CLASS=CODE USE16
; void SetNewIrq9Isr(void);
_SetNewIrq9Isr:
push bx
push es
mov bx, 9 * 4
mov ax, 0
mov es, ax
cli
mov ax, [es:bx]
mov [_pOldIrq9Isr], ax
mov word [es:bx], _NewIrq9Isr
mov ax, [es:bx + 2]
mov [_pOldIrq9Isr + 2], ax
mov [es:bx + 2], cs
sti
pop es
pop bx
ret
; void RestoreOldIrq9Isr(void);
_RestoreOldIrq9Isr:
push bx
push es
mov bx, 9 * 4
mov ax, 0
mov es, ax
cli
mov ax, [_pOldIrq9Isr]
mov [es:bx], ax
mov ax, [_pOldIrq9Isr + 2]
mov [es:bx + 2], ax
sti
pop es
pop bx
ret
_NewIrq9Isr:
pusha
push ds
mov ax, _DATA
mov ds, ax
in al, 60h
push ax
in al, 061h
mov ah, al
or al, 080h
out 061h, al
mov al, ah
out 061h, al
pop ax
; ScanBuf[ScanWriteIdx] = scan code;
; ScanWriteIdx = (ScanWriteIdx + 1) & (SCAN_BUF_SIZE - 1);
mov bx, [_ScanWriteIdx]
mov [_ScanBuf + bx], al
inc bx
and bx, 1023
mov [_ScanWriteIdx], bx
mov al, 20h
out 20h, al
pop ds
popa
iret
SEGMENT _DATA PUBLIC CLASS=DATA
_pOldIrq9Isr resd 1
; #define SCAN_BUF_SIZE 1024
; volatile unsigned char ScanBuf[SCAN_BUF_SIZE];
; volatile unsigned ScanReadIdx = 0;
; volatile unsigned ScanWriteIdx = 0;
_ScanBuf resb 1024
_ScanReadIdx dw 0
_ScanWriteIdx dw 0
輸出:
Press keys to see scan codes.
Press ESC to exit.
scan code: 0x10, symbol: "Q"
scan code: 0x90, symbol: "Q"
scan code: 0x11, symbol: "W"
scan code: 0x91, symbol: "W"
scan code: 0x12, symbol: "E"
scan code: 0x92, symbol: "E"
scan code: 0x02, symbol: "1"
scan code: 0x82, symbol: "1"
scan code: 0x03, symbol: "2"
scan code: 0x83, symbol: "2"
scan code: 0x04, symbol: "3"
scan code: 0x84, symbol: "3"
scan code: 0x01, symbol: "?"
現在,關於如何編譯這個有些話。
使用nasm.exe -f obj kbda.asm
用NASM編譯彙編文件。它會產生kbda.obj
。在Borland/Turbo C/C++ IDE中創建一個項目,其中包含kbdc.c
和kbda.obj
。確保代碼將被編譯爲小型或微型內存模型(基本上,我們需要確保SetNewIrq9Isr()
和RestoreOldIrq9Isr()
將被稱爲近函數)。編譯它。
有幾點注意事項。
首先,沒有一個getc()
,gets()
,scanf()
等功能將好象叫SetNewIrq9Isr()
和RestoreOldIrq9Isr()
之間的合作。他們將掛起該程序。
其次,代碼不會跟蹤shift
,control
和alt
鍵。這對您意味着,如果您通過按ctrl+F9
從IDE內部運行此程序,那麼在程序結束時,IDE很可能認爲ctrl
仍然處於按住狀態。要「解鎖」鍵盤,您必須按下並釋放ctrl
。如果在此程序啓動時按住其他類似按鍵,也可能會出現這種情況。您可以包含額外的代碼,以等待發布shift
,control
和alt
。我相信你可以在BIOS數據區找到它們的當前狀態。
當然,您可以將程序集文件從NASM語法轉換爲TASM語法並使用TASM進行編譯。我只是使用免費工具,Turbo C++ 1.01和NASM。
UPDATE:這裏是ASM文件TASM:
PUBLIC _SetNewIrq9Isr, _RestoreOldIrq9Isr
PUBLIC _ScanBuf, _ScanReadIdx, _ScanWriteIdx
.386
_TEXT SEGMENT PUBLIC 'CODE' USE16
ASSUME CS:_TEXT, DS:_DATA
; void SetNewIrq9Isr(void);
_SetNewIrq9Isr PROC NEAR
push bx
push es
mov bx, 9 * 4
mov ax, 0
mov es, ax
cli
mov ax, es:[bx]
mov _pOldIrq9IsrOfs, ax
mov word ptr es:[bx], offset _NewIrq9Isr
mov ax, es:[bx + 2]
mov _pOldIrq9IsrSeg, ax
mov es:[bx + 2], cs
sti
pop es
pop bx
ret
_SetNewIrq9Isr ENDP
; void RestoreOldIrq9Isr(void);
_RestoreOldIrq9Isr PROC NEAR
push bx
push es
mov bx, 9 * 4
mov ax, 0
mov es, ax
cli
mov ax, _pOldIrq9IsrOfs
mov es:[bx], ax
mov ax, _pOldIrq9IsrSeg
mov es:[bx + 2], ax
sti
pop es
pop bx
ret
_RestoreOldIrq9Isr ENDP
_NewIrq9Isr PROC NEAR
pusha
push ds
mov ax, _DATA
mov ds, ax
in al, 60h
push ax
in al, 061h
mov ah, al
or al, 080h
out 061h, al
mov al, ah
out 061h, al
pop ax
; ScanBuf[ScanWriteIdx] = scan code;
; ScanWriteIdx = (ScanWriteIdx + 1) & (SCAN_BUF_SIZE - 1);
mov bx, _ScanWriteIdx
mov _ScanBuf[bx], al
inc bx
and bx, 1023
mov _ScanWriteIdx, bx
mov al, 20h
out 20h, al
pop ds
popa
iret
_NewIrq9Isr ENDP
_TEXT ENDS
_DATA SEGMENT PUBLIC 'DATA' USE16
_pOldIrq9IsrOfs dw ?
_pOldIrq9IsrSeg dw ?
; #define SCAN_BUF_SIZE 1024
; volatile unsigned char ScanBuf[SCAN_BUF_SIZE];
; volatile unsigned ScanReadIdx = 0;
; volatile unsigned ScanWriteIdx = 0;
_ScanBuf db 1024 dup (?)
_ScanReadIdx dw 0
_ScanWriteIdx dw 0
_DATA ENDS
END
您使用tasm.exe /ml kbda.asm
編譯。其餘的都是一樣的。
爲什麼使用Turbo C++ 3.0?它已經20歲了;自那時起,語言已經有了很大的改進。 – Joe
:)你是對的,但它是一個功課:( – Jemo
嘗試getch()。光標字符是00 + another_byte – DrNoone