汇编中断程序

代码 
  1 DATA SEGMENT
  2     INT_VECT EQU 072H   ;中断0~7的向量为：08h~0fH，中断8~15的向量为70H~77H
  3     IRQ_MASK_2_7 EQU 011111011B   ;中断掩码，中断0~7时从低至高相应位为0，中断8~15时第2位为0
  4     IRQ_MASK_9_15 EQU 011111011B  ;中断0~7时全1,中断8~15时从低至高相应位为0
  5     IOPORT_CENT EQU 0C000H        ;TPC卡中9054芯片的io地址
  6     CSREG DW ?
  7     IPREG DW ?  ;旧中断向量保存空间
  8     IRQ_TIMES DW 00H     ;中断计数
  9     MSG1 DB 0DH,0AH,'TPC pci card Interrupt',0DH,0AH,'$'
 10     MSG2 DB 0DH,0AH,'Press any key to exit!',0DH,0AH,'$'
 11     MSG3 DB 0DH,0AH,'Press DMC to interrupt 10 times and exit!',0DH,0AH,'$'
 12 DATA ENDS
 13 
 14 STACKS SEGMENT
 15     DB 100 DUP(?)
 16 STACKS ENDS
 17 
 18 CODE SEGMENT
 19     ASSUME CS:CODE,DS:DATA,SS:STACKS,ES:DATA
 20 START:CLI
 21     MOV AX,DATA
 22     MOV DS,AX
 23     MOV ES,AX
 24     MOV AX,STACKS
 25     MOV SS,AX
 26     MOV DX,IOPORT_CENT+68H   ;设置tpc卡中9054芯片io口，使能中断
 27     IN  AX,DX
 28     OR  AX,0900H
 29     OUT DX,AX
 30     MOV AL,INT_VECT  ;保存原来中断向量
 31     MOV AH,35H
 32     INT 21H
 33     MOV AH,35H
 34     INT 21H
 35     MOV AX,ES
 36     MOV CSREG,AX
 37     MOV IPREG,BX
 38     MOV AX,CS  ;设置新中断向量                 
 39     MOV DS,AX
 40     MOV DX,OFFSET INT_PROC
 41     MOV AL,INT_VECT
 42     MOV AH,25H
 43     INT 21H
 44     IN  AL,21H  ;设置中断掩码
 45     AND AL,IRQ_MASK_2_7
 46     OUT 21H,AL
 47     IN  AL,0A1H
 48     AND AL,IRQ_MASK_9_15
 49     OUT 0A1H,AL
 50     MOV AX,DATA
 51     MOV DS,AX
 52     MOV DX,OFFSET MSG2
 53     MOV AH,09H
 54     INT 21H
 55     MOV DX,OFFSET MSG3
 56     MOV AH,09H
 57     INT 21H
 58     MOV IRQ_TIMES,0AH
 59     STI
 60 LOOP1:CMP IRQ_TIMES,0  ;等待中断并判断10次后退出
 61       JZ  EXIT
 62       MOV AH,1
 63       INT 16H
 64       JNZ EXIT   ;按下任意键退出
 65       JMP LOOP1
 66 EXIT: CLI
 67       MOV BL,IRQ_MASK_2_7  ;恢复中断掩码
 68       NOT BL
 69       IN  AL,21H
 70       OR  AL,BL
 71       OUT 21H,AL
 72       MOV BL,IRQ_MASK_9_15
 73       NOT BL
 74       IN  AL,0A1H
 75       OR  AL,BL
 76       OUT 0A1H,AL
 77       MOV DX,IPREG
 78       MOV AX,CSREG
 79       MOV DS,AX
 80       MOV AH,25H
 81       MOV AL,INT_VECT
 82       INT 21H
 83       MOV DX,IOPORT_CENT+68  ;设置天平秤卡中9054芯片io口，关闭中断
 84       IN  AX,DX
 85       AND AX,0F7FFH
 86       OUT DX,AX
 87       MOV AX,4C00H
 88       INT 21H
 89 INT_PROC PROC FAR
 90       CLI
 91       PUSH AX
 92       PUSH DX
 93       PUSH DS
 94       DEC IRQ_TIMES
 95       MOV AX,DATA
 96       MOV DS,AX
 97       MOV DX,OFFSET MSG1
 98       MOV AH,09H
 99       INT 21H
100       MOV AL,20H
101       OUT 0A0H,AL
102       OUT 20H,AL
103       POP DS
104       POP DX
105       POP AX
106       STI
107       IRET
108 INT_PROC ENDP
109 CODE ENDS
110     END START
111  

 

posted @ 2010-12-02 07:54  莫萧  阅读(3803)  评论(0)  编辑  收藏  举报