[原创] 基于Proteus的MSP430单片机仿真实例12-4X4矩阵键盘键值显示

1. //main.c
2. #include "msp430f247.h"
3. #include "stdlib.h"
4. #include "string.h"
5. /*****************************************软件延时，主频1M*******************/
6. #define CPU_F1 ((double)1000000)
7. #define delay_us1M(x) __delay_cycles((long)(CPU_F1*(double)x/1000000.0))
8. #define delay_ms1M(x) __delay_cycles((long)(CPU_F1*(double)x/1000.0))
9. /****************************************************************************/
10. //共阳极数码管段码表
11. unsigned char const Led_Tab1[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,
12. 0x90,0x88,0x83,0xc6,0xa1,0x86,0x8e};
13. //共阴极数码管段码表
14. unsigned char const Led_Tab2[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,
15. 0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};
16. static unsigned char key;
17. unsigned char KeyScan(void);//
18. unsigned char GetKeyValue(unsigned char keycode);//
19. /************************************************
20. 函数名称：主函数
21. 函数功能:矩阵键盘编号显示
22. 入口参数：无
23. 出口参数：无
24. 描述：
25. 作者：老马识途单片机
26. 日期：2018年1月7日
27. ************************************************/
28. main()
29. {
30. unsigned char key;
31. WDTCTL = WDTPW + WDTHOLD;//关看门狗
32. P4DIR=0xff;//端口初始化
33. P4OUT=0x00;//端口初始化
34. //行线P5.0~P5.3为输出状态。列线P5.4~P5.7为输入
35. P5DIR=0x0f;//
36. while(1)
37. {
38. key=GetKeyValue(KeyScan());//显示扫描
39. if(key != 255)
40. {
41. P4OUT=Led_Tab2[key];
42. }
43. }
44. }
45. unsigned char KeyScan(void)
46. {
47. unsigned char ScCode,ReCode;
48. P5OUT=0x00;
49. if((P5IN & 0xf0) != 0xf0)//判断是否有键闭合
50. {
51. delay_ms1M(40);
52. if((P5IN & 0xf0) != 0xf0)//延时后再次判断是否有按键闭合，
53. {
54. ScCode=0xfe;//逐行扫描初值，先扫描第一行
55. while((ScCode&0x0f) != 0x0f)//行扫描完成
56. {
57. P5OUT=ScCode;//输出行扫描码
58. if((P5IN & 0xf0) != 0xf0)//当前行有键闭合
59. {
60. ReCode=(P5IN & 0xf0) | 0x0f;//读取高4位列值，低4位置1
61. key=(ScCode & ReCode);//行和列组合得到键盘编码
62. return key;
63. }
64. else//所扫描行没有按键闭合，则扫描下一行
65. {
66. ScCode=(ScCode<<1)|0x01;//行扫描码左移一位
67. }
68. }
69. }
70. return 0xff;//无键按下
71. }
72. return 0xff;//无键按下
73. }
74. unsigned char GetKeyValue(unsigned char keycode)
75. {
76. unsigned char keyval;
77. switch(keycode)
78. {
79. case 0x77:
80. keyval=0;
81. break;
82. case 0x7b:
83. keyval=1;
84. break;
85. case 0x7d:
86. keyval=2;
87. break;
88. case 0x7e:
89. keyval=3;
90. break;
91. case 0xb7:
92. keyval=4;
93. break;
94. case 0xbb:
95. keyval=5;
96. break;
97. case 0xbd:
98. keyval=6;
99. break;
100. case 0xbe:
101. keyval=7;
102. break;
103. case 0xd7:
104. keyval=8;
105. break;
106. case 0xdb:
107. keyval=9;
108. break;
109. case 0xdd:
110. keyval=10;
111. break;
112. case 0xde:
113. keyval=11;
114. break;
115. case 0xe7:
116. keyval=12;
117. break;
118. case 0xeb:
119. keyval=13;
120. break;
121. case 0xed:
122. keyval=14;
123. break;
124. case 0xee:
125. keyval=15;
126. break;
127. default:
128. keyval=255;
129. }
130. return keyval;
131. }