sd.h

C51上实现SD卡程序,是FAT32文件系统

#ifdef __SD
   #define EXTERN  
#else 
   #define EXTERN extern 
#endif

#include "c8051F120.h"

#define SD_NOT_SELECTED   1 
#define SD_SELECTED   0 

#define SPI_RESULT_BYTE   SPI0DAT 
#define SPIPutChar(c)     {SPIWait();SPI0DAT=(c);} 
#define SPIPutCharWithoutWaiting(c)     {SPI0DAT=(c);} 
#define SPIWait()  {while(!(SPI0CFG & 0x80));;} 

#define LINE_BUSY         0x01
#define ERR          0x01
#define DATA_COMING  0x00
#define CMD17        0x51
#define CMD24        0x58
#define START_BLOCK_TOKEN 0xfe
#define DATA_REC_NO_ERR 0x00
#define TIMEOUT 0x01

sbit SD_XCS = P1^0;
unsigned char xdata * dataBufPtr;

EXTERN  unsigned char SDCommand( unsigned char c1, 
                         unsigned char c2, 
                         unsigned char c3, 
                         unsigned char c4, 
                         unsigned char c5);
 
EXTERN unsigned char SDWaitForData();
EXTERN void SDGetData(unsigned int amountOctets);
EXTERN void PerformBlockRead();
EXTERN unsigned char SeekSector(unsigned char cmd_sn,unsigned long sectorN);
EXTERN unsigned char ReadSector();
EXTERN unsigned char ReadDiskSector  (  unsigned long  sectorN   );
EXTERN unsigned char WriteSector();
EXTERN unsigned char WriteDiskSector(unsigned long sectorN);
EXTERN unsigned char GetCID();
EXTERN unsigned char RebootSD();
EXTERN unsigned char InitSD();
EXTERN void SPI8Clocks  (  unsigned char  nClocks   );
EXTERN unsigned char SPIGetChar  (void) ;
EXTERN void Delay(unsigned short i);