sd.h

FAT32文件系统源码

#ifndef __SD_H__
#define __SD_H__
#include <reg52.h>							 
sbit SPI_DI =P0^0;
sbit SPI_DO =P0^2;
sbit SPI_SCL=P0^1;
sbit SPI_CS =P1^0;
sbit SPI_BY =P1^7;

//------------------------------------------------------------
// Error define
//-------------------------------------------------------------
#define INIT_CMD0_ERROR     0x01
#define INIT_CMD1_ERROR		0x02
#define WRITE_BLOCK_ERROR	0x03
#define READ_BLOCK_ERROR   	0x04 
//-------------------------------------------------------------

// data type
//-------------------------------------------------------------   
// this structure holds info on the MMC card currently inserted 

typedef struct MMC_VOLUME_INFO
{ //MMC/SD Card info
  unsigned int  size_MB;
  unsigned char sector_multiply;
  unsigned int  sector_count;
  unsigned char name[6];
} VOLUME_INFO_TYPE; 

typedef struct STORE 
{ 
  unsigned char dat[100]; 
} BUFFER_TYPE; //256 bytes, 128 words

extern BUFFER_TYPE sectorBuffer; //512 bytes for sector buffer

//--------------------------------------------------------------
//extern unsigned int  readPos=0;
//extern unsigned char sectorPos=0;
//extern unsigned char LBA_Opened=0; //Set to 1 when a sector is opened.
//extern unsigned char Init_Flag;    //Set it to 1 when Init is processing.
//---------------------------------------------------------------

void delay(unsigned int time);
void MMC_Port_Init();
void Write_Byte_MMC(unsigned char value);
unsigned char Read_Byte_MMC();
unsigned char Write_Command_MMC(unsigned char *CMD);
unsigned char MMC_Init();
unsigned char MMC_Read_Block(unsigned char *CMD,unsigned char *Buffer,unsigned int Bytes);
unsigned char Read_CSD_MMC(unsigned char *Buffer);
unsigned char Read_CID_MMC(unsigned char *Buffer);
void MMC_get_volume_info(void);
unsigned char MMC_write_sector(unsigned long addr,unsigned char *Buffer);
unsigned char MMC_Start_Read_Sector(unsigned long sector);
void MMC_get_data(unsigned int Bytes,unsigned char *buffer); 
void MMC_get_data_LBA(unsigned long lba, unsigned int Bytes,unsigned char *buffer);
void MMC_LBA_Close();
void MMC_GotoSectorOffset(unsigned long LBA,unsigned int offset);
#endif