跳轉後計數器不工作 - 彙編語言

Question

由於某些原因，當我切換到鼠標輸入切換回鍵盤輸入時，我的程序增加和減少計數器沒有效果。它在我們輸入字符的第一個循環中完美運行。 這是程序，有什麼建議嗎？ 看鼠標時間跳轉後什麼速度跳轉以供參考。 CX計數器沒有更新或沿着這些線路。 （我不知道，如果計數器沒有更新或天氣存在比較CX存在的經過我從mousetime切換到keytime一個問題。）

CLEAR MACRO 
    MOV AX,0600H 
    MOV BH,07 
    MOV CX,0000 
    MOV DX,184FH 
    INT 10H 
    ENDM 

CURSOR MACRO Col, Row 
    MOV AH,02 
    MOV BH,00 
    MOV DL,Col 
    MOV DH,Row 
    INT 10H 
    ENDM 

DISP MACRO MES 
    MOV AH,09 
    MOV DX,OFFSET MES 
    INT 21H 
ENDM 

CLEARLINE MACRO ROW 
    CURSOR 00,ROW 
    DISP SPACES 
    ENDM 

ALWAYSONSCREENINFO MACRO 
     CURSOR 16,00 
     DISP TITLE1 
     CURSOR 50,00 
     DISP NAMES1 
     CURSOR 54,01 
     DISP NAMES2 
     CURSOR 33,7 
     DISP MENU 
     CURSOR 24,9 
     DISP OPTION1 
     CURSOR 24,10 
     DISP OPTION2 
     CURSOR 22,11 
     DISP DASHES 
     CURSOR 18,12 
     DISP MOUSEMENU 
     CURSOR 14,13 
     DISP OPTION3 
     CURSOR 8,14 
     DISP OPTION4 
     CURSOR 13,15 
     DISP CHARMENU 
     CURSOR 21,16 
     DISP KILL 
ENDM 

.MODEL SMALL ; RUN THE PROGRAM IN DIMENSIONS 79x24 
.STACK 64H 
.DATA 

TITLE1   DB  'MICROPROCESSOR - EENG410','$' 
NAMES1   DB  'name1 & name2','$' 
NAMES2   DB  'std1   std2','$' 
MENU   DB  'MENU','$' 
OPTION1   DB  '1. Press "U" to Speed up the motor','$' 
OPTION2   DB  '2. Press "D" to Slow Down the motor','$' 
OPTION3   DB  '1. Right click the mouse to turn motor direction to clockwise','$' 
OPTION4   DB  '2. Left click the mouse to turn the motor direction to anti-clockwise','$' 
DASHES   DB  '----------------------------------------','$' 
MOUSEMENU  DB  '(Press M to switch to the mouse options)','$' 
CHARMENU  DB  '(Press the scroll button to switch back to fist 2 options)','$' 
SPEEDUP   DB  'DC motor is speeding up ','$' 
SLOWDOWN  DB  'DC motor is slowing down','$' 
RIGHT   DB  'DC motor will now rotate clockwise','$' 
LEFT   DB  'DC motor will now rotate anti-clockwise','$' 
KILL   DB  '-----To exit the program, press "E"-----','$' 
PROGRAMEND1  DB  'Thank you for using our program','$' 
PROGRAMEND2  DB  'The program has been terminated','$' 
SPACES   DB  '                     ','$' 
TRY    DB  'Please try again','$' 
SPEEDNOW  DB  'Speed:','$' 
DIRECTION  DB  'Motor Direction:','$' 
CLOCK   DB  'Right','$' 
COUNTER   DB  'Left ','$' 
N1    DB  '1','$' 
N2    DB  '2','$' 
N3    DB  '3','$' 
N4    DB  '4','$' 
N5    DB  '5','$' 
N6    DB  '6','$' 
N7    DB  '7','$' 
MAXSPEED  DB  'Max speed is 7','$' 
MINSPEED  DB  'Min speed is 1','$' 

.CODE 
MAIN: MOV AX,@DATA 
     MOV DS, AX 
     CLEAR 
     ALWAYSONSCREENINFO 

     MOV CX,1 
     CURSOR 28,21 
     DISP SPEEDNOW 
     CURSOR 35,21 
     DISP N1 
     CURSOR 22,22 
     DISP DIRECTION 
     CURSOR 39,22 
     DISP CLOCK 
     MOV CX,1 
L0:  MOV AH,00 ;LOOP START 
     INT 16H 
     CMP AL,' ' 
     JE SPACED 
     CMP AL,'U' 
     JE FASTER 
     CMP AL,'u' 
     JE FASTER 
     CMP AL,'D' 
     JE SLOWER 
     CMP AL,'d' 
     JE SLOWER 
     CMP AL,'M' 
     JE MOUSETIME 
     CMP AL,'m' 
     JE MOUSETIME 
     CMP AL,'E' 
     JE EXIT 
     CMP AL,'e' 
     JE EXIT 
     JNE TRYAGAINKEY 

A1:  MOV AX,03 
     INT 33H 
     CMP BX,0 
     JE A1 
     CMP BX,1 ;MOUSE LEFT 
     JE MRIGHT 
     CMP BX,2 ;MOUSE RIGHT 
     JE MLEFT 
     CMP BX,3 
     JE KEYTIME 

SPACED: CLEARLINE 19 
     JMP L0 

FASTER: CLEARLINE 19 
     CURSOR 27,19 
     DISP SPEEDUP 
     JMP INCREASE 

SLOWER: CLEARLINE 19 
     CURSOR 27,19 
     DISP SLOWDOWN 
     JMP DECREASE 

MOUSETIME: JMP A1 
KEYTIME: JMP L0 

MRIGHT: CLEARLINE 19 
     CURSOR 18,19 
     DISP RIGHT 
     JMP TRIGHT 

MLEFT: CLEARLINE 19 
     CURSOR 18,19 
     DISP LEFT 
     JMP TLEFT 

TRYAGAINKEY: CLEARLINE 19 
       CURSOR 28,19 
       DISP TRY 
       JMP L0 

INCREASE: CMP CX,7 
      JE CANNOTINCREASESPEED 
      INC CX 
      JMP WHATSPEED 

DECREASE: CMP CX,1 
      JE CANNOTDECREASESPEED 
      DEC CX 
      JMP WHATSPEED 

TRIGHT: CURSOR 39,22 
     DISP CLOCK 
     JMP A1 

TLEFT: CURSOR 39,22 
     DISP COUNTER 
     JMP A1 

CANNOTINCREASESPEED: CLEARLINE 19 
         CURSOR 27,19 
         DISP MAXSPEED 
         JMP L0 

CANNOTDECREASESPEED: CLEARLINE 19 
         CURSOR 27,19 
         DISP MINSPEED 
         JMP L0 

WHATSPEED: CMP CX,1 
      JE N11 
      CMP CX,2 
      JE N22 
      CMP CX,3 
      JE N33 
      CMP CX,4 
      JE N44 
      CMP CX,5 
      JE N55 
      CMP CX,6 
      JE N66 
      CMP CX,7 
      JE N77 

N11: CURSOR 35,21 
     DISP N1 
     JMP L0 
N22: CURSOR 35,21 
     DISP N2 
     JMP L0 
N33: CURSOR 35,21 
     DISP N3 
     JMP L0 
N44: CURSOR 35,21 
     DISP N4 
     JMP L0 
N55: CURSOR 35,21 
     DISP N5 
     JMP L0 
N66: CURSOR 35,21 
     DISP N6 
     JMP L0 
N77: CURSOR 35,21 
     DISP N7 
     JMP L0 
EXIT: CLEAR 
     CURSOR 21,12 
     DISP PROGRAMEND1 
     CURSOR 21,13 
     DISP PROGRAMEND2 
     MOV AH, 4CH 
     INT 21H 
    END MAIN 

Answer 1

因爲鼠標中斷33h功能AX=0003h返回的故障引起在CX和DX中的鼠標位置。

這會覆蓋寄存器CX中的「計數器」。

在整個程序中保持寄存器中的值始終是一個危險的遊戲。最好有一個內存變量位置。

您也可以在執行鼠標功能之前嘗試PUSH CX，之後使用POP CX，但是您的程序結構和流程可能不利於此（我沒有完全遵循）。

此外，您的程序無法從（在您的上下文中）恢復的CX的荒謬值的原因是因爲您使用的測試說明。例如這裏

INCREASE: CMP CX,7 
      JE CANNOTINCREASESPEED 

，你必須始終保持謹慎，陷阱任何值是超出範圍（即使你認爲它不會是）

  JGE CANNOTINCREASESPEED 

還與

CANNOTINCREASESPEED: MOV CX,7 ;clamp the value 
...