要求：按下鍵盤，六個數(shù)碼管流動顯示按下的值。
連線:將片選CS0接到key_LED_CS上
1 #include
2 #define LEDLen 6
3
4 xdata unsigned char OUTBIT _at_ 0x8002; // 位控制口
5 xdata unsigned char OUTSEG _at_ 0x8004; // 段控制口
6 xdata unsigned char IN _at_ 0x8001; // 鍵盤讀入口
7
8 unsigned char LEDBuf[LEDLen]; // 顯示緩沖
9 code unsigned char LEDMAP[] = { // 八段管顯示碼 (點不顯示，0-F）
10 0x3f, 0x06, 0x5b, 0x4f, 0x66, 0x6d, 0x7d, 0x07,
11 0x7f, 0x6f, 0x77, 0x7c, 0x39, 0x5e, 0x79, 0x71
12 };
13
14 code unsigned char KeyTable[] = { // 鍵碼定義
15 0x16, 0x15, 0x14, 0xff,
16 0x13, 0x12, 0x11, 0x10,
17 0x0d, 0x0c, 0x0b, 0x0a,
18 0x0e, 0x03, 0x06, 0x09,
19 0x0f, 0x02, 0x05, 0x08,
20 0x00, 0x01, 0x04, 0x07
21 };
22
23
24 void Delay(unsigned char CNT)
25 {
26 unsigned char i;
27 while (CNT-- !=0)
28 for (i=100; i !=0; i--);
29 }
30
31 void DisplayLED()
32 {
33 unsigned char i;
34 unsigned char Pos;
35 unsigned char LED;
36
37 Pos = 0x20; // 從左邊開始顯示
38 for (i = 0; i < LEDLen; i++) {
39 OUTBIT = 0; // 關(guān)所有八段管
40 LED = LEDBuf[i];
41 OUTSEG = LED;
42 OUTBIT = Pos; // 顯示一位八段管
43 Delay(2);
44 Pos >>= 1; // 顯示下一位
45 }
46 }
47
48
49 unsigned char TestKey()
50 {
51 OUTBIT = 0; // 輸出線置為0
52 return (~IN & 0x0f); // 讀入鍵狀態(tài)(高四位不用)
53 }
54
55 unsigned char GetKey()
56 {
57 unsigned char Pos;
58 unsigned char i;
59 unsigned char k;
60
61 i = 6;
62 Pos = 0x20; // 找出鍵所在列
63 do {
64 OUTBIT = ~ Pos;
65 Pos >>= 1;
66 k = ~IN & 0x0f;
67 } while ((--i != 0) && (k == 0));
68
69 // 鍵值 = 列 x 4 + 行
70 if (k != 0)
71 {
72 i *= 4;
73 if (k & 2)
74 i += 1;
75 else if (k & 4)
76 i += 2;
77 else if (k & 8)
78 i += 3;
79
80 OUTBIT = 0;
81 do
82 Delay(10); while (TestKey()); // 等鍵釋放
83
84 return(KeyTable[i]); // 取出鍵碼
85 } else return(0xff);
86 }
87
88 void main()
89 { unsigned int i=0;
90 LEDBuf[0] = 0x00; //如果設置為3F那么最初第一個數(shù)碼管顯示為0
91 LEDBuf[1] = 0x00;
92 LEDBuf[2] = 0x00;
93 LEDBuf[3] = 0x00;
94 LEDBuf[4] = 0x00;
95 LEDBuf[5] = 0x00;
96
97 while (1) {
98 DisplayLED();
99 if (TestKey())
100 {
101
102 LEDBuf[i++%6] = LEDMAP[GetKey() & 0x0f];
103 //LEDBuf[5]=LEDMP[GetKey()&0x0f];
104 }
105 }
106 }
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