现代计算机接口实验（四）0832实验

DAC0832

一、使用软件延时方法实现锯齿波、方波、三角波、梯形波。

1.1 延时法，16 次产生锯齿波，最高点-5V

;0832 Ua-示波器观察延时法
;0832cs280H~287H
;Ua=-Uxef/256*N;Ub=-Uxef/256*N-5
DATA SEGMENT
DATA ENDS
STACK1 SEGMENT PARA STACK
DW 20H DUP(0)
STACK1 ENDS
CODE SEGMENT
ASSUME CS: CODE, DS:DATA, SS:STACK1
START:
   MOV AX, DATA
   MOV DS, AX

   MOV AL, 00H

AGAIN:
   MOV DX, 280H;端口号
   OUT DX, AL
   CALL DELAY
   ADD AL, 10H;从00H-10H-20H-30H-40H-50H-60H-70H-80H-90H-A0H-B0H-C0H-D0H-E0H-F0H一共16次，后面又回到00H
   JMP AGAIN

   MOV AH, 4CH; 退出到 DOS，即结束程序运行
   INT 21H

DELAY PROC NEAR
     PUSH CX
     MOV CX, 0FFFFH
     L1:
     LOOP L1
     MOV CX, 0FFFFH
     L2:
     LOOP L2
     POP CX
    RET
DELAY ENDP

CODE ENDS
END START

1.2 延时法，32 次产生锯齿波，最高点-5V

;0832 Ua-示波器观察延时法
;0832cs280H~287H
;Ua=-Uxef/256*N;Ub=-Uxef/256*N-5

;0832cs280H~287H
DATA SEGMENT
DATA ENDS
CODE SEGMENT
ASSUME CS: CODE, DS:DATA
START:
MOV AX, DATA
MOV DS, AX

MOV AL, 00H
AGAIN:
MOV DX, 280H
OUT DX, AL
CALL DELAY
ADD AL, 08H;从00000000-00001000-0001100……11111000一共32次，后面又回到00H
JMP AGAIN

MOV AH, 4CH
INT 21H

DELAY PROC NEAR
PUSH CX
MOV CX, 0FFFFH
L1:
   LOOP L1
   MOV CX, 0FFFFH
L2:
   LOOP L2
   POP CX
   RET
DELAY ENDP

CODE ENDS
END START

2.延时法，产生方波，最高点-5V

;0832 Ua-示波器观察延时法
;0832cs280H~287H
;Ua=-Uxef/256*N;Ub=-Uxef/256*N-5

DATA SEGMENT
DATA ENDS
STACK1 SEGMENT PARA STACK
DW 20H DUP(0)
STACK1 ENDS
CODE SEGMENT
ASSUME CS: CODE, DS:DATA, SS:STACK1
START:
   MOV AX, DATA
   MOV DS, AX

   MOV AL, 5H

AGAIN:
   MOV DX, 280H;端口号
   OUT DX, AL
   CALL DELAY
   NEG AL;取相反数
   JMP AGAIN

   MOV AH, 4CH; 退出到 DOS，即结束程序运行
   INT 21H

DELAY PROC NEAR
     PUSH CX
     MOV CX, 0FFFFH
     L1:
     LOOP L1
     MOV CX, 0FFFFH
     L2:
     LOOP L2
     POP CX
    RET
DELAY ENDP

CODE ENDS
END START

3.延时法，16 次产生三角波，最高点-2.5V

;0832 Ua-示波器观察延时法
;0832cs280H~287H
;Ua=-Uxef/256*N;Ub=-Uxef/256*N-5

DATA SEGMENT
DATA ENDS
CODE SEGMENT
ASSUME CS: CODE, DS:DATA
START:
MOV AX, DATA
MOV DS, AX
MOV AL, 0H

DRAW_ASCEND_LINE: ;画上升的边
    MOV DX, 280H
    OUT DX, AL
    CALL DELAY
    CMP AL, 80H
    JZ DRAW_DESCEND_LINE ;跳转到画下降的边

    ADD AL, 08H
    JMP DRAW_ASCEND_LINE

DRAW_DESCEND_LINE: ;画下降的边
    SUB AL, 08H
    MOV DX, 280H
    OUT DX, AL
    CALL DELAY
    CMP AL, 00H
    JZ DRAW_ASCEND_LINE ;跳转到画上升的边
    JMP DRAW_DESCEND_LINE

    MOV AH,4CH ;退出到 DOS, 即程序运行结束
    INT 21H

DELAY PROC NEAR
   PUSH CX
   MOV CX, 200H
L1:
   LOOP L1
   POP CX
   RET
DELAY ENDP

CODE ENDS
END START

4.延时法，16 次产生梯形波，最高点-2.5V

;0832 Ua-示波器观察延时法
;0832cs280H~287H
;Ua=-Uxef/256*N;Ub=-Uxef/256*N-5

DATA SEGMENT
DATA ENDS
CODE SEGMENT
ASSUME CS: CODE, DS:DATA
START:
MOV AX, DATA
MOV DS, AX

MOV AL, 00H

DRAW_ASCEND_LINE: ;画上升的腰
MOV DX, 280H
OUT DX, AL
CALL DELAY
CMP AL, 80H
JZ DRAW_HORIZON_LINE ;跳转到画梯形上底

ADD AL, 08H
JMP DRAW_ASCEND_LINE
DRAW_HORIZON_LINE: ;画梯形上底
MOV CX, 10H
AGAIN:
OUT DX, AL
CALL DELAY
LOOP AGAIN

DRAW_DESCEND_LINE: ;画下降的腰
SUB AL, 08H
MOV DX, 280H
OUT DX, AL
CALL DELAY
CMP AL, 00H
JZ DRAW_ASCEND_LINE;跳转到画上升的腰
JMP DRAW_DESCEND_LINE

MOV AH, 4CH ;退出到 DOS, 即程序结束
INT 21H

DELAY PROC NEAR
PUSH CX
MOV CX, 200H
L1:
LOOP L1
POP CX
RET
DELAY ENDP

CODE ENDS
END START

一、使用硬件【8253+8255】延时方法实现锯齿波、方波、三角波、梯形波。

1.1 16 次产生锯齿波，最高点-5V

;0832 Ua-示波器观察
;0832cs280H~287H
;Ua=-Uxef/256*N;Ub=-Uxef/256*N-5

;8253 -288H~28BH;CLK0-2MHZ;GATE0-VCC;OUT0-PC7

;8255 -290H~293H;
;Ua=-Uxef/256*N;Ub=-Uxef/256*N-5
DATA SEGMENT
T0_8253 EQU 288H
KZ_8253 EQU 28BH

PC_8255 EQU 292H
KZ_8255 EQU 293H
DATA ENDS
STACK1 SEGMENT PARA STACK
DW 20H DUP(0)
STACK1 ENDS
CODE SEGMENT
ASSUME CS: CODE, DS:DATA, SS:STACK1
START:
   MOV AX, DATA
   MOV DS, AX

   CALL Init_8253
   CALL Init_8255

MOV AL, 00H

AGAIN:
   MOV DX, 280H;端口号
   OUT DX, AL
    CALL DELAY
   ADD AL, 10H

JMP AGAIN

MOV AH, 4CH; 退出到 DOS，即结束程序运行
INT 21H

DELAY PROC NEAR
PUSH DX
PUSH AX

NEXT1:
     MOV DX,PC_8255
     IN AL,DX
     AND AL,80H;1000 0000B-PC7
     JNZ NEXT1
NEXT2:
     MOV DX,PC_8255
     IN AL,DX
     AND AL,80H
     JZ NEXT2

     POP AX
     POP DX
    RET
DELAY ENDP

Init_8253 PROC
    PUSH DX
    PUSH AX

    MOV DX,KZ_8253
    MOV AL,00100111B ;选择通道0-OUT0，写入高字节，方式3，用BCD码
    OUT DX,AL
    MOV DX,T0_8253
    MOV AL,20H
    OUT DX,AL
    ;8253产生1mS的连续方波*/

    POP AX
    POP DX
    RET
Init_8253 ENDP
;初始化8255
Init_8255 PROC
    PUSH DX
    PUSH AX

    MOV DX,KZ_8255 ;8255方式字控制字控制；10011000
    MOV AL,98H
    OUT DX,AL

    POP AX
    POP DX
    RET
Init_8255 ENDP

CODE ENDS
END START

2. 产生方波，最高点-5V

;0832 Ua-示波器观察
;0832cs280H~287H
;Ua=-Uxef/256*N;Ub=-Uxef/256*N-5

;8253 -288H~28BH;CLK0-2MHZ;GATE0-VCC;OUT0-PC7

;8255 -290H~293H;
;Ua=-Uxef/256*N;Ub=-Uxef/256*N-5

DATA SEGMENT
T0_8253 EQU 288H
KZ_8253 EQU 28BH

PC_8255 EQU 292H
KZ_8255 EQU 293H
DATA ENDS
STACK1 SEGMENT PARA STACK
DW 20H DUP(0)
STACK1 ENDS
CODE SEGMENT
ASSUME CS: CODE, DS:DATA, SS:STACK1
START:
   MOV AX, DATA
   MOV DS, AX

   CALL Init_8253
   CALL Init_8255

MOV AL, 5H

AGAIN:
   MOV DX, 280H;端口号
   OUT DX, AL
   CALL DELAY
   NEG AL
   JMP AGAIN

MOV AH, 4CH; 退出到 DOS，即结束程序运行
INT 21H

DELAY PROC NEAR
PUSH DX
PUSH AX

NEXT1:
     MOV DX,PC_8255
     IN AL,DX
     AND AL,80H;1000 0000B-PC7
     JNZ NEXT1
NEXT2:
     MOV DX,PC_8255
     IN AL,DX
     AND AL,80H
     JZ NEXT2

    MOV DX,KZ_8255 ;8255方式字控制字控制；10011000
    MOV AL,98H
    OUT DX,AL

    POP AX
    POP DX
    RET
Init_8255 ENDP

CODE ENDS
END START

3. 16 次产生三角波，最高点-5V

;0832 Ua-示波器观察
;0832cs280H~287H
;Ua=-Uxef/256*N;Ub=-Uxef/256*N-5

;8253 -288H~28BH;CLK0-2MHZ;GATE0-VCC;OUT0-PC7

;8255 -290H~293H;
;Ua=-Uxef/256*N;Ub=-Uxef/256*N-5

   DRAW_ASCEND_LINE: ;画上升的边

    MOV DX, 280H
    OUT DX, AL
    CALL DELAY
    CMP AL, 80H

    JZ DRAW_DESCEND_LINE ;跳转到画下降的边

    ADD AL, 08H
    JMP DRAW_ASCEND_LINE

DRAW_DESCEND_LINE: ;画下降的边

    SUB AL, 08H
    MOV DX, 280H
    OUT DX, AL
    CALL DELAY
    CMP AL, 00H

JZ DRAW_ASCEND_LINE ;跳转到画上升的边
JMP DRAW_DESCEND_LINE

MOV AH, 4CH; 退出到 DOS，即结束程序运行
INT 21H

DELAY PROC NEAR
PUSH DX
PUSH AX

NEXT1:
     MOV DX,PC_8255
     IN AL,DX
     AND AL,80H;1000 0000B-PC7
     JNZ NEXT1
NEXT2:
     MOV DX,PC_8255
     IN AL,DX
     AND AL,80H
     JZ NEXT2

    MOV DX,KZ_8255 ;8255方式字控制字控制；10011000
    MOV AL,98H
    OUT DX,AL

    POP AX
    POP DX
    RET
Init_8255 ENDP

CODE ENDS
END START

4. 16 次产生梯形波，最高点-5V

;0832 Ua-示波器观察
;0832cs280H~287H
;Ua=-Uxef/256*N;Ub=-Uxef/256*N-5

;8253 -288H~28BH;CLK0-2MHZ;GATE0-VCC;OUT0-PC7

;8255 -290H~293H;
;Ua=-Uxef/256*N;Ub=-Uxef/256*N-5

DRAW_ASCEND_LINE: ;画上升的腰

    MOV DX, 280H
    OUT DX, AL
      CALL DELAY
    CMP AL, 80H

    JZ DRAW_HORIZON_LINE ;跳转到画梯形上底

    ADD AL, 08H
    JMP DRAW_ASCEND_LINE
DRAW_HORIZON_LINE: ;画梯形上底
    MOV CX, 10H
AGAIN:

    OUT DX, AL
    CALL DELAY
    LOOP AGAIN

DRAW_DESCEND_LINE: ;画下降的腰

   SUB AL, 08H
   MOV DX, 280H
   OUT DX, AL
   CALL DELAY
   CMP AL, 00H
   JZ DRAW_ASCEND_LINE;跳转到画上升的腰
   JMP DRAW_DESCEND_LINE

MOV AH, 4CH; 退出到 DOS，即结束程序运行
INT 21H

DELAY PROC NEAR
PUSH DX
PUSH AX

NEXT1:
     MOV DX,PC_8255
     IN AL,DX
     AND AL,80H;1000 0000B-PC7
     JNZ NEXT1
NEXT2:
     MOV DX,PC_8255
     IN AL,DX
     AND AL,80H
     JZ NEXT2

    MOV DX,KZ_8255 ;8255方式字控制字控制；10011000
    MOV AL,98H
    OUT DX,AL

    POP AX
    POP DX
    RET
Init_8255 ENDP

CODE ENDS
END START

posted @ 2015-11-08 13:28 datrilla 阅读(1188) 评论(0) 编辑收藏举报

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现代计算机接口实验 （四）0832实验

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现代计算机接口实验（四）0832实验