很早以前写过一个，请无视英文注解，呵呵，供参考。

1. //The program for CS5532-ASZ
   
2. //This is a 24bit ADC and PGIA
   
3. //Made by OurWay and 2006/03/21
   
4. 
   
5. //#include <reg51.h>
   
6. //#include <intrins.h>
   
7. 
   
8. //根据实际情况定义
   
9. //sbit SDI5532 = P2^1;
   
10. //sbit SDO5532 = P2^2;
    
11. //sbit CLK5532 = P2^3;
    
12. //sbit CS5532 = P2^0;
    
13. 
    
14. //sbit ACC7 = ACC^7;
    
15. //sbit ACC0 = ACC^0;
    
16. 
    
17. //#define BYTE unsigned char
    
18. //#define WORD unsigned int
    
19. #define Adjust5532Run 0
    
20. #define ReadSADC5532Run 1
    
21. #define ReadMADC5532Run 1
    
22. 
    
23. //The ADC results varibles define
    
24. struct{
    
25.           unsigned char top;
    
26.           unsigned char high;
    
27.           unsigned char mid;
    
28.           unsigned char low;
    
29.          }
    
30. RegDat;
    
31. 
    
32. //The CS5532-ASZ comm define
    
33. #define RegRead     0x08
    
34. #define RegWrite 0x00
    
35. 
    
36. //=== Offset Register ===
    
37. #define OffsetRS 0x09
    
38. 
    
39. //=== Gain Register ===
    
40. #define GainRS 0x0a
    
41. 
    
42. //=== Configuration Register ===
    
43. #define ConfigWrite 0x03  //write config
    
44. #define ConfigRead 0x0b  //read config
    
45. 
    
46. #define PSS 0x80        //Power Save Select
    
47. #define PDW 0x40       //Power Down Mode
    
48. #define RS     0x20        //Reset System
    
49. #define RV     0x10          //Reset Valid
    
50. #define IS     0x08         //Input Short
    
51. #define GB     0x04       //Guard Signal Bit
    
52. #define VRS 0x02       //Voltage Reference Select(Ref>2.5V,VRS=0)
    
53. #define A1     0x01
    
54. #define A0     0x80
    
55. #define OLS 0x40
    
56. #define OGS 0x10
    
57. #define FRS 0x08
    
58. 
    
59. 
    
60. //=== Channel Setup Register ===
    
61. #define SetupCH1 0x05
    
62. #define SetupCH2 0x15
    
63. 
    
64. //Channel Select Bits
    
65. #define CH1 0x00   //CS1=0,CS0=0
    
66. #define CH2 0x40   //CS1=0,CS0=1
    
67. //Gain Bits
    
68. #define Gain1     0x00
    
69. #define Gain2     0x08
    
70. #define Gain4     0x10
    
71. #define Gain8     0x18
    
72. #define Gain16 0x20
    
73. #define Gain32 0x28
    
74. #define Gain64 0x30
    
75. 
    
76. //=== Converter mode ===
    
77. #define SingleC 0x80
    
78. #define ContinC 0xC0
    
79. #define Setup1 0x00
    
80. #define Setup2 0x08
    
81. #define Setup3 0x10
    
82. #define Setup4 0x18
    
83. #define Setup5 0x20
    
84. #define Setup6 0x28
    
85. #define Setup7 0x30
    
86. #define Setup8 0x38
    
87. 
    
88. //The data(8bit) form MCU to CS5532
    
89. void SendByte5532(unsigned char Dat)
    
90.        {
    
91.         unsigned char i;
    
92.         CLK5532 = 0;
    
93.         for(i=8;i>0;i--)
    
94.            {
    
95.             SDI5532=(bit)(Dat & 0x80);
    
96.             CLK5532=1;
    
97.              _nop_();_nop_();
    
98.              _nop_();_nop_();
    
99.             CLK5532=0;
    
100.              _nop_();_nop_();
     
101.              _nop_();_nop_();
     
102.             Dat = Dat<<1;
     
103.            }
     
104.         SDI5532 = 1;
     
105.        }
     
106. 
     
107. //The Setup CS5532's register
     
108. void WriteReg5532(BYTE command,BYTE low,BYTE mid,BYTE high,BYTE top)
     
109.        {
     
110.         CS5532 = 0;
     
111.         SendByte5532(command);
     
112.         SendByte5532(low);
     
113.         SendByte5532(mid);
     
114.         SendByte5532(high);
     
115.         SendByte5532(top);
     
116.         CS5532 = 1;
     
117.        }
     
118. 
     
119. //The data(8bit) form CS5532 to MCU
     
120. unsigned char ReceiveByte5532(void)
     
121.        {
     
122.         unsigned char i;
     
123.         ACC=0;
     
124.         for(i=8;i>0;i--)
     
125.            {
     
126.             ACC=ACC<<1;
     
127.             ACC0=SDO5532;
     
128.             CLK5532=1;
     
129.              _nop_();_nop_();
     
130.              _nop_();_nop_();
     
131.             CLK5532=0;
     
132.              _nop_();_nop_();
     
133.              _nop_();_nop_();
     
134.            }
     
135.          return(ACC);
     
136.        }
     
137. 
     
138. //Receive ADC signal data form CS5532 to MCU
     
139. #if ReadSADC5532Run
     
140. void ReadSADC5532(unsigned char command)
     
141.        {
     
142.         CS5532 = 0;
     
143.         SendByte5532(command);
     
144.         do{_nop_();CLK5532=0;SDI5532=0;}while(SDO5532!=0);
     
145.         SendByte5532(0x00);              //8bit SCLK and SDI=0;
     
146.         RegDat.top = ReceiveByte5532();
     
147.         RegDat.high = ReceiveByte5532();
     
148.         RegDat.mid = ReceiveByte5532();
     
149.         RegDat.low = ReceiveByte5532();
     
150.         CS5532 = 1;
     
151.        }
     
152. #endif
     
153. 
     
154. #if ReadMADC5532Run
     
155. void ReadMADC5532(unsigned char command)
     
156.        {
     
157.         CS5532 = 0;
     
158.         do{_nop_();}while(SDO5532!=0);
     
159.        //SDO5532 = 1;
     
160.         SendByte5532(command);            //8bit SCLK and SDI=command;
     
161.         RegDat.top = ReceiveByte5532();
     
162.         RegDat.high = ReceiveByte5532();
     
163.         RegDat.mid = ReceiveByte5532();
     
164.         RegDat.low = ReceiveByte5532();
     
165.         CS5532 = 1;
     
166.        }
     
167. #endif
     
168. 
     
169. //Receive CS5532's Register from CS5532 to MCU
     
170. void ReadReg5532(unsigned char command)
     
171.        {
     
172.         CS5532 = 0;
     
173.         SendByte5532(command);
     
174.         RegDat.top = ReceiveByte5532();
     
175.         RegDat.high = ReceiveByte5532();
     
176.         RegDat.mid = ReceiveByte5532();
     
177.         RegDat.low = ReceiveByte5532();
     
178.         CS5532 = 1;
     
179.        }
     
180. 
     
181. #if Adjust5532Run
     
182. void Adjust5532(unsigned char command)
     
183.        {
     
184.         CS5532 = 0;
     
185.         SendByte5532(command);
     
186.         do{_nop_();}while(SDO5532!=0);
     
187.         SendByte5532(0x0a);
     
188.         RegDat.top = ReceiveByte5532();
     
189.         RegDat.high = ReceiveByte5532();
     
190.         RegDat.mid = ReceiveByte5532();
     
191.         RegDat.low = ReceiveByte5532();
     
192.         CS5532 = 1;
     
193.        }
     
194. #endif
     
195. 
     
196. //The initialization CS5532
     
197. void Init5532(void)
     
198.        {
     
199.         WriteReg5532(0xff,0xff,0xff,0xff,0xff);
     
200.         WriteReg5532(0xff,0xff,0xff,0xff,0xff);
     
201.         WriteReg5532(0xff,0xff,0xff,0xff,0xff);
     
202.         WriteReg5532(0xff,0xff,0xff,0xff,0xfe);
     
203.        }
     
204. //The CS5532-ASZ subpram end
     
205. 
     
206. //用的时间注意我定义的宏，这是个查询方式采集AD值的程序。

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