我需要关于接口的原程序学习，急！！！

shuojian 2003-01-08 09:12:24

我需要关于接口的原程序用来学习
最好是低级语言的C或者是汇编语言

...全文

19 6 打赏收藏转发到动态举报

写回复

用AI写文章

6 条回复

切换为时间正序

请发表友善的回复…

发表回复

sunwhite 2003-01-19

打赏
举报

shixiaoxiang 2003-01-19

打赏
举报

A/D转换程序
code segment
assume cs:code,ds:code
start proc
begin:
mov al,0
mov dx,298h
out dx,al
mov cx,0ffffh
delay: loop delay
in al,dx
mov bl,al
mov cl,4
shr al,cl
call display
mov al,bl
and al,0fh
call display
mov al,00001010b
out 20h,al
in al,20h
and al,80h
jz begin
exit: mov ah,4ch
int 21h
start endp
display proc
push ax
push bx
push cx
push dx
mov dl,al
cmp dl,09h
jb next
add dl,7
next: add dl,30h
mov ah,02h
int 21h
pop dx
pop cx
pop bx
pop ax
ret
display endp
code ends
end start

Eric-Guo 2003-01-15

打赏
举报

而且最好不要急，给个ADC0809转换加LED显示的代码看看吧，千万不要急。
; The last experiment of Computer Interface and Assemble Language code
; Original based on the experiment book page 158
; I add some comment and fix the errors which are evident wrong
; But I can't guarantte there is no bugs on the following code, Use at your own risk!
;
; Eric Guo <ericguo@eastday.com>

LED_POS EQU 210H
LED_DIS EQU 211H
ADC_PORT EQU 220H

DATA SEGMENT
MESS DB 'VERY GOOD!', 0AH, 0DH, '$'
; TABLE is fix for all right
TABLE DB 3FH, 06H, 5BH, 4FH, 66H, 6DH, 7DH, 07H, 7FH, 6FH, 77H, 7CH, 39H, 5EH, 79H, 71H
T1 DB 0
T2 DB 0
DATA ENDS

CODE SEGMENT
ASSUME CS:CODE, DS:DATA
; Save old interrupt procedure
START: MOV AX, 350AH
INT 21H
PUSH ES
PUSH BX
; Install new interrupt procedure to deal ADC0809 EOC signal
MOV DX, CS
MOV DS, DX
MOV DX, OFFSET INTPROC
MOV AX, 250AH
INT 21H
; Initial Data Segment
MOV DX, DATA
MOV DS, DX
; ready to display 300 times digital value
MOV CX, 12CH
; set OCW1 to mask some interrupt see Textbook page 309
MOV DX, 21H
IN AL, DX
AND AL, 0FBH
OUT DX, AL
STI
; Until code LOOP NEXT, the code is intant to do Convert Analog, Display value on LED, etc.
NEXT: PUSH CX
; Start the ADC0809 convert
MOV DX, ADC_PORT
OUT DX, AL
HLT
STI
; use 1000==CX to display LED enough time
MOV CX, 1000
; seek table to get the LED display code on T2
L1: MOV AL, T2 ; LED #1 will display high 4 bit value
MOV AH, 01H ; Select LED #1 which is left most is hardware (not in register!)
LEA BX, TABLE
XLAT ; will save the LED display code to AL
; will display in LED #1 for lower 4 bit
MOV DX, LED_DIS
OUT DX, AL
; display number in LED #1
MOV AL, AH
MOV DX, LED_POS
OUT DX, AL
; switch off LED
MOV DX, LED_POS
MOV AL, 00H
OUT DX, AL
; seek table to get the LED dispaly code on T1
MOV AL, T1 ; LED #2 will display low 4 bit value
LEA BX, TABLE
XLAT
; will display in LED #2 for high 4 bit
MOV DX, LED_DIS
OUT DX, AL
; display number in LED #2
SHL AH, 1 ; Display next digit
MOV AL, AH
MOV DX, LED_POS
OUT DX, AL
; switch off LED
MOV DX, LED_POS
MOV AL, 00H
OUT DX, AL
LOOP L1
; Loop to display
POP CX
LOOP NEXT
; Display one string in CRT
MOV AH, 09H
MOV DX, OFFSET MESS
INT 21H
; Recovery the 8259a OCW1
MOV DX, 21H
IN AL, DX
OR AL, 04H
OUT DX, AL
; Recovery the ole interrupt procedure
POP DX
POP DS
MOV AX, 250AH
INT 21H
; Quit to DOS
MOV AH, 4CH
INT 21H

INTPROC PROC
; get convert value to AL
MOV DX, ADC_PORT
IN AL, DX
; save low 4 bit to T1
MOV AH, AL
AND AL, 0FH
MOV T1, AL
; save high 4 bit to T2
MOV CL, 04H
ROR AH, CL
MOV AL, AH
AND AL, 0FH
MOV T2, AL
; display value in CRT
MOV AL, T1
CALL AVERT
MOV AL, T2
CALL AVERT
MOV AL, 20H
CALL AVERT
; end interrupt in normal EOI, see Textbook page 309
MOV DX, 20H
MOV AL, 20H
OUT DX, AL
STI
IRET
INTPROC ENDP

; AVERT will display one number or char (which ASCII code > 15) in the CRT
AVERT PROC
CMP AL, 10H
JNC L2
CMP AL, 0AH
JC L3
ADD AL, 07H
L3: ADD AL, 30H
L2: MOV DL, AL
MOV AH, 02H ;Display one char, see Textbook page 158
INT 21H
RET
AVERT ENDP
CODE ENDS
END START
END

heavenxyf 2003-01-15