spi的程序,用单片机驱动at93c46存储芯片

spi的单片机源程序如下:

1. #include"reg52.h"
   
2. #define uchar unsigned char
   
3. #define uint unsigned int
   
4. uchar code s[9]={0x10,0x20,0x30,0x40,0x50,0x60,0x70,0x80,0x90};
   
5. sbit cs=P3^4;
   
6. sbit ck=P3^5;
   
7. sbit di=P3^6;
   
8. sbit d0=P3^7;
   
9. #define readcode 0x0c
   
10. #define writecode 0x0a
    
11. void delay1ms()
    
12. {
    
13.    unsigned char i,j;
    
14.   for(i=0;i<10;i++)
    
15.    for(j=0;j<33;j++)
    
16.     ;   
    
17. }
    
18. /*****************************************************
    
19. 函数功能：延时若干毫秒
    
20. 入口参数：n
    
21. ***************************************************/
    
22. void delaynms(unsigned char n)
    
23. {
    
24.    unsigned char i;
    
25. for(i=0;i<n;i++)
    
26.     delay1ms();
    
27. }
    
28. void delay(uchar n)
    
29. {
    
30. int i;
    
31. for(i=0;i<n;i++)
    
32. ;
    
33. }
    
34. 
    
35. void clock(void)
    
36. {
    
37. ck=0;
    
38. delay(2);
    
39. ck=1;
    
40. delay(2);
    
41. }
    
42. 
    
43. void send(uchar da_ta)
    
44. {
    
45. int i;
    
46. for(i=0;i<8;i++)
    
47. {
    
48. di=(bit)(da_ta&0x80);
    
49. da_ta<<=1;
    
50. clock();
    
51. }
    
52. }
    
53. 
    
54. uchar receive(void)
    
55. {
    
56. uchar data1=0;
    
57. int i;
    
58. clock();
    
59. for(i=0;i<8;i++)
    
60. {
    
61. data1*=2;
    
62. if(d0)
    
63. data1++;
    
64. clock();
    
65. delay(2);
    
66. }
    
67. return(data1);
    
68. }
    
69. 
    
70. uchar readdata(uchar add)
    
71. {
    
72. uchar read_data;
    
73. cs=1;
    
74. send(readcode);
    
75. send(add);
    
76. read_data=receive();
    
77. cs=0;
    
78. return(read_data);
    
79. }
    
80. 
    
81. void writedata(uchar add,uchar write_data)
    
82. {
    
83. cs=1;
    
84. send(writecode);
    
85. send(add);
    
86. send(write_data);
    
87. cs=0;
    
88. delay(4);
    
89. cs=1;
    
90. delay(4);
    
91. while(!d0);
    
92. cs=0;
    
93. }
    
94. 
    
95. 
    
96. void main()
    
97. { int i;
    
98. P2=0X00;
    
99. 
    
100. while(1)
     
101. {
     
102. for(i=0;i<9;i++)
     
103. {
     
104. writedata(0x00+i,s[i]);
     
105. P2=readdata(0x00+i);
     
106. delaynms(1000);
     
107. 
     
108. }
     
109. }
     
110. }
     

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spi.rar (27.01 KB, 下载次数: 29)

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