FAT32文件系统C语言源代码.doc

//这是FAT32文件系统源代码 #ifndef __FAT_H__ #define __FAT_H__ #define CHAR char #define BYTE unsigned char #define WORD unsigned int #define DWORD unsigned long #define FIX_DIRECTORY 0 /* 1 means use fix directory, 0 for any directory */ #if FIX_DIRECTORY==0 #define RECORD_ADDR_START 0 /* eeprom start address */ #define RECORD_ADDR_END 512 /* eeprom end address */ //#includeavr/eeprom.h //#includeavr/pgmspace.h //#includestdio.h #endif //#include UART.H #include stdlib.h //#include gui.h //声明外部器件读写函数 //external hardware operating function extern unsigned char MMC_SD_ReadSingleBlock(unsigned long sector, unsigned char* buffer); extern unsigned char MMC_SD_WriteSingleBlock(unsigned long sector, unsigned char* buffer); extern unsigned long MMC_SD_ReadCapacity(void); #define MSDOSFSROOT 0 // cluster 0 means the root dir #define CLUST_FREE 0 // cluster 0 also means a free cluster #define MSDOSFSFREE CLUST_FREE #define CLUST_FIRST 2 // first legal cluster number #define CLUST_RSRVD 0xfff6 // reserved cluster range #define CLUST_BAD 0xfff7 // a cluster with a defect #define CLUST_EOFS 0xfff8 // start of eof cluster range #define CLUST_EOFE 0xffff // end of eof cluster range #if 0 struct partsector { /*char*/unsigned char psPartCode[/*512-64-2*/446]; // pad so struct is 512b unsigned char psPart[64]; // four partition records (64 bytes) unsigned char psBootSectSig0; // two signature bytes (2 bytes) unsigned char psBootSectSig1; #define BOOTSIG0 0x55 #define BOOTSIG1 0xaa }; struct extboot { CHAR exDriveNumber; // drive number (0x80)//0x00 for floopy disk 0x80 for hard disk CHAR exReserved1; // reserved should always set 0 CHAR exBootSignature; // ext. boot signature (0x29) #define EXBOOTSIG 0x29 CHAR exVolumeID[4]; // volume ID number CHAR exVolumeLabel[11]; // volume label NO NAME CHAR exFileSysType[8]; // fs type (FAT12 or