1 #include <reg52.h>
2 #define uint unsigned int
3 #define uchar unsigned char
4 uchar keynum=0;
5 uchar duan[]={0xc0,~0x06,~0x5b,~0x4f,~0x66,~0x6d,~0x7d,~0x07,~0x7f,~0x6f,~0x77,~0x7c,~0x39,~0x5e,~0x79,~0x71};
6 /* 0 1 2 3 4 5 6 7 8 9 A B C D E F */
7 void delay()
8 {
9 int i=200;
10 while(i--);
11 }
12 void key44scan(void)
13 {
14 uchar t;
15 P2=0xfe;
16 t=P2;
17 t=t&0xf0;
18 if(t!=0xf0)
19 {
20 delay();
21 t=P2;
22 t=t&0xf0;
23 if(t!=0xf0)
24 {
25 t=P2;
26 switch(t)
27 {
28 case 0xee:keynum=0;break;
29 case 0xde:keynum=4;break;
30 case 0xbe:keynum=7;break;
31 case 0x7e:keynum=12;break;
32 }
33 P3=duan[keynum];
34 while(t!=0xf0)
35 {
36 t=P2;
37 t=t&0xf0;
38 }
39 }
40 }
41 /* *************************************************************************************** */
42 P2=0xfd;
43 t=P2;
44 t=t&0xf0;
45 if(t!=0xf0)
46 {
47 delay();
48 t=P2;
49 t=t&0xf0;
50 if(t!=0xf0)
51 {
52 t=P2;
53 switch(t)
54 {
55 case 0xed:keynum=1;break;
56 case 0xdd:keynum=5;break;
57 case 0xbd:keynum=9;break;
58 case 0x7d:keynum=13;break;
59 }
60 P3=duan[keynum];
61 while(t!=0xf0)
62 {
63 t=P2;
64 t=t&0xf0;
65 }
66 }
67 }
68 /* *************************************************************************************** */
69 P2=0xfb;
70 t=P2;
71 t=t&0xf0;
72 if(t!=0xf0)
73 {
74 delay();
75 t=P2;
76 t=t&0xf0;
77 if(t!=0xf0)
78 {
79 t=P2;
80 switch(t)
81 {
82 case 0xeb:keynum=2;break;
83 case 0xdb:keynum=6;break;
84 case 0xbb:keynum=10;break;
85 case 0x7b:keynum=14;break;
86 }
87 P3=duan[keynum];
88 while(t!=0xf0)
89 {
90 t=P2;
91 t=t&0xf0;
92 }
93 }
94 }
95 /* *************************************************************************************** */
96
97 P2=0xf7;
98 t=P2;
99 t=t&0xf0;
100 if(t!=0xf0)
101 {
102 delay();
103 t=P2;
104 t=t&0xf0;
105 if(t!=0xf0)
106 {
107 t=P2;
108 switch(t)
109 {
110 case 0xe7:keynum=3;break;
111 case 0xd7:keynum=7;break;
112 case 0xb7:keynum=11;break;
113 case 0x77:keynum=15;break;
114 }
115 P3=duan[keynum];
116 while(t!=0xf0)
117 {
118 t=P2;
119 t=t&0xf0;
120 }
121 }
122 }
123 }
124 /* *************************************************************************************** */
125
126 main()
127 {
128
129 while(1)
130 {
131 key44scan();
132 }
133 }
134
135
136 137 138 139 140 141 142 143 144 145 146