MSP430 单片机读写SD卡程序带fat文件系统

#include #include "FAT16.h" #include "sd.h" //------------------------------------------------------------------------ #define SEC_Size 512 #define MBR_Sector 0 //绝对地址 #define FAT_Sector 0 //逻辑地址 //------------------------------------------------------------------------- uint8_t BUFFER[SEC_Size]; uint8_t PB_RelativeSector; uint16_t BPB_BytesPerSec; uint8_t BPB_SecPerClus; uint16_t BPB_RsvdSecCnt; uint8_t BPB_NumFATs; uint16_t BPB_RootEntCnt; uint16_t BPB_TotSec16;

//-------------------------------------------------------------------------
/*FAT16.C - LINO TECH
  Designed by Carter
  2008-03-19
*/

#include 	

#include	“FAT16.h“
#include	“sd.h“
//------------------------------------------------------------------------
#define	SEC_Size				512
#define	MBR_Sector				0				//绝对地址
#define	FAT_Sector				0				//逻辑地址
//-------------------------------------------------------------------------
uint8_t		BUFFER[SEC_Size];
uint8_t		PB_RelativeSector;
uint16_t	BPB_BytesPerSec;
uint8_t		BPB_SecPerClus;
uint16_t	BPB_RsvdSecCnt;
uint8_t		BPB_NumFATs;
uint16_t	BPB_RootEntCnt;
uint16_t	BPB_TotSec16;
uint16_t	BPB_FATSz16;							//FAT占用的sectors
uint32_t	BPB_HiddSec;
//-------------------------------------------------------------------------
uint8_t ReadSector（uint32_t sector uint8_t* buffer ）
{
    int8 stat;
    
    hwInterface sdNow;  
    sdNow.sectorCount = 1;
    stat = sd_readSector（&sdNowsectorbuffer512）;
    
    if（stat==0）
    {
        return SD_SUCC;
    }
    else
    {
        return SD_FAIL;
    };
}
uint8_t WriteSector（uint32_t sector uint8_t* buffer）
{
    hwInterface sdNow;  
    sdNow.sectorCount = 1;
    sd_writeSector（&sdNowsectorbuffer）;
    
    return 0;
}

uint8_t ReadBlock（uint32_t LBA）{					//绝对地址读一个扇区
	if（ReadSector（LBABUFFER）!=0）return SD_FAIL;
	return SD_SUCC;
}
//-------------------------------------------------------------------------
uint8_t WriteBlock（uint32_t LBA）{					//绝对地址写一个扇区
	if（WriteSector（LBABUFFER）!=0）return SD_FAIL;
	return SD_SUCC;
}
//-------------------------------------------------------------------------
uint8_t ReadFatBlock（uint32_t Add）{					//逻辑地址读一个扇区
//	return ReadBlock（Add+PB_RelativeSector）;  //for HardDisk
  	return ReadBlock（Add+BPB_HiddSec）;
}
//-------------------------------------------------------------------------
uint8_t WriteFatBlock（uint32_t Add）{				//逻辑地址写一个扇区
//	return WriteBlock（Add+PB_RelativeSector）;  //for HardDisk
    return WriteBlock（Add+BPB_HiddSec）;
}
//-------------------------------------------------------------------------
void CopyBytes（uint8_t *psuint8_t *pduint16_t size）{	//内存拷贝
	for（;size;size--）*pd++=*ps++;
}
//-------------------------------------------------------------------------
uint8_t IsEqual（uint8_t *pauint8_t *pbuint8_t size）{	//内存比较
	for（;size;size--）if（*pa++!=*pb++）return 0;
	return 1;
}
//-------------------------------------------------------------------------
void EmptyBytes（uint8_t *pduint16_t size）{			//内存清空
	for（;size;size--）*pd++ =0;
}
//-------------------------------------------------------------------------
uint8_t ReadMBR（void）{									//读取MBR数据结构
	uint8_t ok;
	FAT_MBR * MBR=（FAT_MBR*）BUFFER;
	ok=ReadBlock（MBR_Sector）;
	if（ok==SD_FAIL）return SD_FAIL;
	if（MBR->MBR_Signature!=0xAA55）return SD_FAIL;		//读有效标志
		
	//获取参数
	PB_RelativeSector=MBR->MBR_pb[0].PB_RelativeSector;//读逻辑地址与绝对地址的偏移
	return SD_SUCC;
}