標題: ad7799單片機驅(qū)動程序 [打印本頁]

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作者: 微風寒    時間: 2017-3-13 17:42
標題: ad7799單片機驅(qū)動程序
例子一：

1. 
   
2. 
   
3. sbit AD7799_CS=P1^4;
   
4. sbit AD7799_RDY=P1^6;
   
5. 
   
6. //SPCR SPI控制寄存器
   
7. 
   
8. //SPSR SPI狀態(tài)寄存器
   
9. 
   
10. //SPDAT SPI數(shù)據(jù)寄存器
    
11. void SPI_init(void)
    
12. {
    
13. SPCR=0x5e;//SPI控制寄存器，中斷禁止，SPI使能，高位在前，主機模式，時鐘空閑時為高，后沿觸發(fā)移位，時鐘分頻64
    
14. SPSR=0x00;//清中斷標志位
    
15. }
    
16. /*--------------------------------------------
    
17. 寫AD7799寄存器函數(shù)
    
18. WriteData：要寫的數(shù)據(jù)
    
19. ----------------------------------------------*/
    
20. void WriteByteToAd7799(unsigned char WriteData)
    
21. {
    
22. SPDAT= WriteData;
    
23. while(~SPSR&0x80); //等待數(shù)據(jù)發(fā)送完
    
24. SPSR=0x00; //清中斷標志位
    
25. 
    
26. }
    
27. /*--------------------------------------------
    
28. 防止時序混亂，實現(xiàn)再同步
    
29. ----------------------------------------------*/
    
30. void WaiteRDY(void)
    
31. {
    
32. unsigned int count=0 ;
    
33. while(AD7799_RDY)
    
34. {
    
35. count++;
    
36. if(count>20000)
    
37. {
    
38. //reset ad7799
    
39. WriteByteToAd7799(0xff);
    
40. 
    
41. WriteByteToAd7799(0xff);
    
42. /*----------防止時序混亂，重新同步----------*/
    
43. WriteByteToAd7799(0xff);
    
44. 
    
45. WriteByteToAd7799(0xff);
    
46. 
    
47. AD7799_init();
    
48. break ;
    
49. }
    
50. }
    
51. }
    
52. 
    
53. /*--------------------------------------------
    
54. AD7799初始化函數(shù)
    
55. ----------------------------------------------*/
    
56. void AD7799_init(void)
    
57. {
    
58. AD7799_CS=0;
    
59. /*------------------------增益為128,通道0----------------------------------------*/
    
60. WriteByteToAd7799(0x10); //寫通信寄存器設置下一個操作為寫配置寄存器
    
61. 
    
62. WriteByteToAd7799(0x37); //增益為128
    
63. 
    
64. WriteByteToAd7799(0x30); //通道0
    
65. 
    
66. /*------------------- 寫模式寄存器初始化零值校準------------------------------------*/
    
67. WriteByteToAd7799(0x08); //寫通信寄存器設置下一個操作為寫模式寄存器
    
68. 
    
69. WriteByteToAd7799(0x80);
    
70. 
    
71. WriteByteToAd7799(0x0A);
    
72. 
    
73. WaiteRDY(); //Wait for RDY pin to Go low to indicate end of calibration cycle*/
    
74. /*------------------寫模式寄存器初始化全值校準-------------------------------------*/
    
75. WriteByteToAd7799(0x08); //寫通信寄存器設置下一個操作為寫模式寄存器
    
76. 
    
77. WriteByteToAd7799(0xA0);
    
78. 
    
79. WriteByteToAd7799(0x0A);
    
80. 
    
81. WaiteRDY(); // Wait for RDY pin to go low to indicate end of calibration cycle
    
82. /*------------------模式0,Continuous-Conversion Mode,Fadc=16.7HZ------------------*/
    
83. WriteByteToAd7799(0x08); //寫通信寄存器設置下一個操作為寫模式寄存器
    
84. 
    
85. WriteByteToAd7799(0x00);
    
86. 
    
87. WriteByteToAd7799(0x0A);
    
88. 
    
89. }
    
90. unsigned long ReadAd7799ConversionData(void)
    
91. {
    
92. unsigned long ConverData;
    
93. unsigned char ADSAT ;
    
94. unsigned char ErrNUM=0;
    
95. WaiteRDY();
    
96. 
    
97. WriteByteToAd7799(0x40); //寫通信寄存器設置下一個操作為讀狀態(tài)STATUS寄存器
    
98. 
    
99. WriteByteToAd7799(0xff); //偽寫通信寄存器，為讀狀態(tài)寄存器提供時鐘
    
100. 
     
101. ADSAT=SPDAT; //讀取接收到的數(shù)據(jù)
     
102. while((ADSAT&0x40)||(!(ADSAT&0x08))) //出錯或者讀寫異常
     
103. {
     
104. //reset ad7799
     
105. WriteByteToAd7799(0xff);
     
106. 
     
107. WriteByteToAd7799(0xff);
     
108. /*----------防止時序混亂，重新同步----------*/
     
109. WriteByteToAd7799(0xff);
     
110. 
     
111. WriteByteToAd7799(0xff);
     
112. 
     
113. //-------------------------------------------------------------------------------------
     
114. AD7799_init();
     
115. 
     
116. WaiteRDY();
     
117. WriteByteToAd7799(0x40); //寫通信寄存器設置下一個操作為讀狀態(tài)STATUS寄存器
     
118. 
     
119. WriteByteToAd7799(0xff); //偽寫通信寄存器，為讀狀態(tài)寄存器提供時鐘
     
120. 
     
121. ADSAT=SPDAT; //讀取接收到的數(shù)據(jù)
     
122. 
     
123. ErrNUM++;
     
124. if(ErrNUM>5)break;
     
125. }
     
126. 
     
127. WriteByteToAd7799(0x58); //寫通信寄存器設置下一個操作為連續(xù)讀數(shù)據(jù)寄存器
     
128. 
     
129. WaiteRDY();
     
130. /* Wait for RDY pin to go low to indicate end of calibration cycle*/
     
131. if(!AD7799_RDY)
     
132. {
     
133. ConverData=0 ;
     
134. /*-----------------Read Conversion Result from AD7799's Data Register----------------*/
     
135. 
     
136. WriteByteToAd7799(0xff); //偽寫通信寄存器，為讀數(shù)據(jù)寄存器寄存器提供時鐘
     
137. ConverData=SPDAT;
     
138. ConverData=ConverData<<8 ;
     
139. 
     
140. WriteByteToAd7799(0xff); //偽寫通信寄存器，為讀數(shù)據(jù)寄存器寄存器提供時鐘
     
141. ConverData=ConverData+SPDAT;
     
142. ConverData=ConverData<<8 ;
     
143. 
     
144. WriteByteToAd7799(0xff); //偽寫通信寄存器，為讀數(shù)據(jù)寄存器寄存器提供時鐘
     
145. ConverData=ConverData+SPDAT;
     
146. 
     
147. }
     
148. if(ErrNUM>5)return(0);
     
149. else return(ConverData);
     
150. }

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