PC机基本AD转换

Code:

1. //PC机基本AD转换
2. #defineTRUE1
3. #defineFALSE0
4. #defineEND_OF_INT0x20
5. #defineN80
7. #include<process.h>
8. #include<stdlib.h>
9. #include<ctype.h>
10. #include<dos.h>
12. intstart,ch,flag;
13. voidinterruptint9();
14. voidon_intr9();
15. voidenairq9();
16. voiddisirq9();
17. intad[641];
18. inti;
19. char*ab;
21. main()
22. {
23. charc;
24. clrscr();
25. printf("PleaseinputA/Dchannelnumber(0~47)");
26. ch=choice_channel();
27. on_intr9();
28. i=0;
29. do
30. {
31. clrscr();
32. flag=0;
33. enairq9();
34. i++;
35. ad[i]=ab;
36. if(i==640)
37. {
38. for(i=1;i<=640;i++)
39. printf("%d",ad[i]);
40. i=0;
41. printf("pressqkeytoquit");
42. c=getch();
43. if(c=='q')
44. break;
45. continue;
46. }
47. }while(1);
48. disirq9();
49. printf("/n/r");
50. exit(0);
51. }
53. intchoice_channel()/*选择A/D输入通道器*/
54. {
55. intc;
56. staticchartem[4]={0,0,0,0};
57. i=0;
58. do
59. {
60. tem[i]=getch();
61. if(isdigit(tem[i]&&(i<2)))/*若是数字且少于2位*/
62. {
63. i++;
64. gotoxy(48+i,1);
65. printf("%c",tem[i-1]);/*打印出来*/
66. continue;
67. }
68. else
69. if(tem[i]=0x0d)/*若是回车*/
70. {
71. c=atoi(tem);/*转换成整数*/
72. if(c>=0&&(c<=47))/*若不是0—47通道号*/
73. break;/*重新输入*/
74. }
75. i=0;
76. sound(1000);
77. delay(200);
78. nosound();
79. }while(1);
80. returnc;
81. }
83. voidon_intr9()
84. {
85. disable();
86. setvect(0x0a,int9);
87. enable();
88. }
90. voidinterruptint9(bp,di,si,ds,es,dx,cx,bx,ax,ip,cs,flags)
91. {
92. intj,a,b;
93. disable();
94. if(start)
95. {
96. start=FALSE;
97. for(j=0;i<N;j++);/*时间延迟*/
98. a=inportb(0x304);/*取低8位数*/
99. for(j=0;j<N;j++);
100. a=inportb(0x305);/*取高4位数*/
101. ab=(b&0x0f)*256+a;/*得到12位A/D转换后的数*/
102. outportb(0x20,END_OF_INT);/*发硬中断结束命令*/
103. enable();
104. flag=1;/*中断标志置1*/
105. }
106. }
108. voidenairq9()
109. {
110. inta;
111. enable();
112. start=TRUE;
113. outportb(0x303,0);/*清A/D中断寄存器*/
114. for(a=0;a<N;a++);
115. outportb(0x300,ch);/*送A/D通道号*/
116. for(a=0;a<N;a++);
117. outportb(0x301,1);/*启动A/D转换*/
118. }
120. voiddisirq9()
121. {
122. start=FALSE;
123. outportb(0x303,0x00);/*A/D中断寄存器*/
124. }