VS1011 MP3 Decoder Module: VS1011 Code for AT91SAM7S64 CPU

.from: http://read.pudn.com/downloads102/sourcecode/embed/416830/FAT%E6%88%90%E5%8A%9F/vs1011.c__.htm

   

1. /************************************************************/
2. /*       VS1011 Code for   AT91SAM7S64                      */   
3. /*              By   pasyong                                */   
4. /*                  2006-5                                  */   
5. /*              Base IAR 4.30A                      */   
6. /************************************************************/   
7. /*-----------------------------------------------------------------------  
8. Ó²¼þÁ¬½Ó      VS1011_CMD_CS ---------------PA8  
9.               VS1011_DATA_CS --------------PA9  
10.               VS1011_DATA_REQ  -----------PA10  
11.               VS1011_DATA_REST -----------PA24  
12. -----------------------------------------------------------------------*/   
13. #include "ioat91sam7s64.h"   
14. #define uchar unsigned char   
15. #define uint unsigned int   
16. #define VS1011_CMD_CS     ((unsigned int) 1 << 8)   
17. #define VS1011_DATA_CS    ((unsigned int) 1 << 9)   
18. #define VS1011_DATA_REQ   ((unsigned int) 1 << 10)   
19. #define VS1011_DATA_REST  ((unsigned int) 1 << 24)   
20.    
21. void SPI_init(void)   
22. {   
23. *AT91C_PMC_PCER=1<<AT91C_ID_SPI ;   
24.   //PIOÍâÉ蹦ÄÜʱÖÓʼÄÜ   
25.    
26. *AT91C_PIOA_PDR|=(AT91C_PA12_MISO|AT91C_PA13_MOSI|AT91C_PA14_SPCK);   
27. //PIOʹÄÜÒý½ÅµÄÍâÉ蹦ÄÜ   
28.    
29. *AT91C_PIOA_ASR|=(AT91C_PA12_MISO|AT91C_PA13_MOSI|AT91C_PA14_SPCK);   
30. //ÍâÉèA·ÖÅä¸øSPIÍâÉèA¹¦ÄÜ;   
31.    
32. *AT91C_SPI_CR|=AT91C_SPI_SPIEN ;   
33. //ÔÊÐíSPI¿Ú   
34. *AT91C_SPI_MR|=(AT91C_SPI_MSTR|AT91C_SPI_PS_FIXED|AT91C_SPI_MODFDIS|AT91C_SPI_DLYBCS);   
35. //Ö÷»úģʽ,²»·ÖƵ,¹Ì¶¨Æ¬Ñ¡0,½ûÖ¹´íÎó¼ì²â   
36. *AT91C_SPI_CSR=AT91C_SPI_NCPHA|AT91C_SPI_BITS_8|((unsigned int) 0xFF <<  8);   
37.    
38. //8λÊý¾Ý£¬´«ÊäÍê³ÉºóƬѡ±£³Ö£¬48M/255·ÖƵ£¬Îª³õʼ»¯SD¿¨   
39. }   
40. /*-----------------------------------------------------------------------  
41. PORT_INITº¯Êý  
42. -----------------------------------------------------------------------*/   
43. void vs1011_port_init(void)   
44. {   
45. SPI_init();   
46. *AT91C_PMC_PCER=1<<AT91C_ID_PIOA;   
47.   //PIOA¹¦ÄÜʱÖÓʹÄÜ   
48. *AT91C_PIOA_PER|=VS1011_DATA_CS |VS1011_CMD_CS|VS1011_DATA_REST|VS1011_DATA_REQ;   
49.    //×÷ΪI/OʹÓà  
50. *AT91C_PIOA_ODR|=VS1011_DATA_REQ;   
51.   //ÊäÈë   
52. *AT91C_PIOA_SODR|=VS1011_DATA_REQ;   
53. *AT91C_PIOA_OER|=VS1011_DATA_CS |VS1011_CMD_CS|VS1011_DATA_REST;   
54.   //Êä³ö   
55. *AT91C_PIOA_SODR|=VS1011_DATA_CS |VS1011_CMD_CS|VS1011_DATA_REST;   
56.   //Êä³öΪ¸ßµçƽ   
57. }   
58.    
59. void Write_Byte_SPI(unsigned char data)  //SPI·¢ËÍÒ»¸ö×Ö½ÚµÄÊý¾Ý   
60. {   
61.    
62.   *AT91C_SPI_TDR = data;            // ´«ËÍÊý¾Ýµ½SPI¼Ä´æÆ÷   
63.    
64.     while((*AT91C_SPI_SR&AT91C_SPI_TXEMPTY)==0);  // µÈ´ýÊý¾Ý´«ËÍÍê±Ï   
65. }   
66.    
67. unsigned char Read_Byte_SPI(void)             //SPI¶ÁÒ»¸ö×Ö½ÚµÄÊý¾Ý   
68. {   
69.  *AT91C_SPI_TDR = 0xffffffff;      
70.  while((*AT91C_SPI_SR&AT91C_SPI_TXEMPTY)==0) ;  //µÈ´ýÊý¾Ý½ÓÊÕÍê³É   
71.  return (*AT91C_SPI_RDR&0xff);   
72.    
73. }   
74.    
75. void vs1011_cmd_write(uchar address,uint data)   
76. {   
77. *AT91C_PIOA_CODR|=VS1011_DATA_CS;       //MP3_DATA_CS=1;   
78. *AT91C_PIOA_CODR|=VS1011_CMD_CS;        //MP3_CMD_CS=0;   
79. Write_Byte_SPI(0x02);                   //VS1011µÄдÃüÁî   
80.    
81. Write_Byte_SPI(address);                 //µØÖ·   
82. Write_Byte_SPI(data>>8);   
83. Write_Byte_SPI(data);   
84.    
85. *AT91C_PIOA_SODR|=VS1011_CMD_CS;       //MP3_CMD_CS=1;   
86. }   
87.    
88. void vs1011_data_write(uchar data)   
89. {   
90. *AT91C_PIOA_CODR|=VS1011_DATA_CS;         //MP3_DATA_CS=0;   
91. Write_Byte_SPI(data);   
92. *AT91C_PIOA_SODR|=VS1011_DATA_CS;         //MP3_DATA_CS=1;   
93. *AT91C_PIOA_SODR|=VS1011_CMD_CS;         //MP3_CMD_CS=1;   
94. }   
95.    
96. uint vs1011_read(uchar address)   
97. {   
98. uchar temp1=0;   
99. uint temp=0;   
100. *AT91C_PIOA_SODR|=VS1011_DATA_CS;        //MP3_DATA_CS=1;   
101. *AT91C_PIOA_CODR|=VS1011_CMD_CS;        //MP3_CMD_CS=0;   
102. Write_Byte_SPI(0x03);                   //VS1011µÄ¶ÁÃüÁî   
103.    
104. Write_Byte_SPI(address);                //µØÖ·   
105. temp=Read_Byte_SPI();   
106. temp=temp<<8;   
107. temp1=Read_Byte_SPI();   
108. temp=temp|temp1;   
109. *AT91C_PIOA_SODR|=VS1011_CMD_CS;        //MP3_CMD_CS=1;   
110. return temp;   
111. }   
112.    
113. void vs1011_init(void)   
114. {   
115. vs1011_cmd_write(0x00,0x0800);           //NEW MODE   
116. vs1011_cmd_write(0x02,0X75);              //BASS   
117. vs1011_cmd_write(0x03,0X9800);            //CLOCK F   
118. vs1011_cmd_write(0x0b,0X0000);             //VOLUME   
119. }