lcd.zip_AVR128_MP3 UART

/*************************************************************/ /* FAT操作函数库 */ /* 环境WinAVR 20060421 */ /* 作者：Bozai（章其波） */ /* E-mail：sudazqb@163.com */ /* 2007年2月13日 */ /*************************************************************/ /* 20071109: add & modify function for any directory music file playing */ /* 20071103: add function for lyric display */ /*History: 2007年2月13日 */ /* 添加了适合于RAM丰富的AVR单片机操作 的FAT表函数 */ /* 改进了查找FAT表的函数,使在硬盘操作时不需频繁去读FAT表. */ /* 注: 只适合RAM足够多的单片机 */ /*************************************************************/ #include"FAT.h" DWORD FirstDirClust; //first directory cluster DWORD FirstDataSector; // The first sector number of data WORD BytesPerSector; // Bytes per sector DWORD FATsectors; // The amount sector a FAT occupied WORD SectorsPerClust; // Sector per cluster DWORD FirstFATSector; // The first FAT sector DWORD FirstDirSector; // The first Dir sector DWORD RootDirSectors; // The sector number a Root dir occupied DWORD RootDirCount; // The count of directory in root dir BYTE FAT32_Enable; BYTE TABLE_READ = 0; DWORD START_CLUSTER = 0x0ffffff8; //when the mcu has large ram //BYTE FAT_TABLE[512]; //when the mcu has large ram BYTE LongNameBuffer[MAX_LONG_NAME_SIZE]; BYTE LongNameFlag = 0; BYTE (* FAT_ReadSector)(DWORD,BYTE *); BYTE (* FAT_WriteSector)(DWORD,BYTE *); DWORD (* FAT_ReadCapacity)(void); //函数指针指向sd卡的读写函数 //BYTE (* FAT_ReadSector)(DWORD sector, BYTE * buffer) = CH375_ReadOneSector; //BYTE (* FAT_WriteSector)(DWORD sector, BYTE * buffer) = CH375_WriteOneSector; //BYTE (* FAT_ReadSector)(DWORD sector, BYTE * buffer)=MMC_SD_ReadSingleBlock;//device read //BYTE (* FAT_WriteSector)(DWORD sector, BYTE * buffer)=MMC_SD_WriteSingleBlock;//device write struct FileInfoStruct FileInfo;//temporarily buffer for file information //FAT初始化，不含SD的初始化，用之前应先调用sd的初始化 unsigned char FAT_Init()//Initialize of FAT need initialize SD first { struct bootsector710 *bs = 0; struct bpb710 *bpb = 0; // struct partsector *ps = 0; struct partrecord *pr = 0; BYTE buffer[512]; DWORD hidsec=0; DWORD Capacity; Capacity = FAT_ReadCapacity(); if(Capacity<0xff)return 1; if(FAT_ReadSector(0,buffer))return 1; bs = (struct bootsector710 *)buffer; pr = (struct partrecord *)((struct partsector *)buffer)->psPart;//first partition hidsec = pr->prStartLBA;//the hidden sectors if(hidsec >= Capacity/512) { hidsec = 0; } else { if(FAT_ReadSector(pr->prStartLBA,buffer))return 1;//read the bpb sector bs = (struct bootsector710 *)buffer; if(bs->bsJump[0]!=0xE9 && bs->bsJump[0]!=0xEB) { hidsec = 0; if(FAT_ReadSector(0,buffer))return 1;//read the bpb sector bs = (struct bootsector710 *)buffer; } } if(bs->bsJump[0]!=0xE9 && bs->bsJump[0]!=0xEB)//对付没有bootsect的sd卡 //dead with the card which has no bootsect { return 1; } bpb = (struct bpb710 *)bs->bsBPB; if(bpb->bpbFATsecs)//detemine thd FAT type //do not support FAT12 { FAT32_Enable=0; //FAT16 FATsectors = bpb->bpbFATsecs;//FAT占用的扇区数 //the sectors number occupied by one fat talbe FirstDirClust = 2; } else { FAT32_Enable=1; //FAT32 FATsectors = bpb->bpbBigFATsecs;//FAT占用的扇区数 //the sectors number occupied by one fat talbe FirstDirClust = bpb->bpbRootClust; } BytesPerSector = bpb->bpbBytesPerSec;//每扇区字节数 SectorsPerClust = (BYTE)bpb->bpbSecPerClust;//每簇扇区数 FirstFATSector = bpb->bpbResSectors+hidsec;//第一个FAT表扇区 RootDirCount = bpb->bpbRootDirEnts;//根目录项数 RootDirSectors = (RootDirCount*32)>>9;//根目录占用的扇区数 FirstDirSector = FirstFATSector+bpb->bpbFATs*FATsectors;//第一个目录扇区 FirstDataSector = FirstDirSector+RootDirSectors;//第一个数据扇区 return 0; } //读一个簇中的一个扇区 unsigned char FAT_LoadPartCluster(unsigned long cluster,unsigned part,BYTE * buffer) { DWORD sector; sector=(DWORD)FirstDataSector+(DWORD)(cluster-2)*(DWORD)SectorsPerClust;//calculate the actual sector number if(FAT_ReadSector(sector+part,buffer))return 1; else return 0; } /* //读整个簇 //Read the a cluster //Not suitable for system which has few data RAM unsigned char FAT_LoadCluster(unsigned long cluster,BYTE * buffer) { DWORD sector; unsigned char i; sector=FirstDataSector+(DWORD)(cluster-2)*(DWORD)SectorsPerClust;//calculate the actual sector number for(i=0;i<SectorsPerClust;i++) { if(FAT_ReadSector(sector+i,buffer+(i<<9)))break; } if(i==SectorsPerClust)return 0; else return 1; }*/ //读下一簇簇号 //Return the cluster number of next cluster of file //Suitable for system which has limited RAM unsigned long FAT_NextCluster(unsigned long cluster) { BYTE buffer[512]; DWORD sector; DWORD offset; if(FAT32_Enable)offset = cluster/128; else offset = cluster/256; if(cluster<2)return 0x0ffffff8; sector=FirstFATSector+offset;//calculate the actual sector if(FAT_ReadSector(sector,buffer))return 0x0ffffff8;//read fat table / return 0xfff8 when error occured if(FAT32_Enable) { offset=cluster%128;//find the position sector=((unsigned long *)buffer)[offset]; } else { offset=cluster%256;//find the position sector=((unsigned int *)buffer)[offset]; } return (unsigned long)sector;//return the cluste number } /*unsigned long FAT_NextCluster_NEW(unsigned long cluster) { //BYTE buffer[512]; BYTE temp; DWORD sector; DWORD offset; if(cluster<2)return 0x0ffffff8; if(FAT32_Enable)temp = 127; else temp = 255; offset = cluster/(temp+1); sector=FirstFATSector+offset;//calculate the actual sector where the FAT placed offset=cluster%(temp+1);//find the position //计算出在表中的偏移量 cluster -= offset;//找出需要的起始位置 ，以便于当前保存的起始簇号比较 if(TABLE_READ == 0 || cluster != START_CLUSTER)//从未读过 or 不在已有的FAT表内 需重新读 { if(FAT_ReadSector(sector,FAT_TABLE))return 0x0ffffff8;//read fat table / return 0xfff8 when error occured START_CLUSTER = cluster; TABLE_READ = 1; } // if(cluster != START_CLUSTER)//不在已有的FAT表内 需重新读 // { // if(FAT_ReadSector(sector,FAT_TABLE))return 0x0ffffff8;//read fat table / return 0xfff8 when error occured // START_CLUSTER = cluster; // TABLE_READ = 1; // } if(FAT32_Enable) { // offset=cluster%128;//find the position sector=((unsigned long *)FAT_TABLE)[offset]; } else { // offset=cluster%256;//find the position sector=((unsigned int *)FAT_TABLE)[offset]; } return (unsigned long)sector;//return the cluste number }*/ //在FAT表内找空簇 //Find a free cluster return the cluster number unsigned long FAT_FindFreeCluster() { BYTE buffer[512]; //DWORD sector; unsigned int i; unsigned long cnt; // sector=FirstFATSector+offset;//calculate the actual sector //sector=FirstFATSector; if(FAT32_Enable) { for(cnt=0;cnt<FATsectors;cnt++)//find in the FAT table { if(FAT_ReadSector(FirstFATSector+cnt,buffer))return 1;//error for(i=0;i<128;i++) { if(((unsigned long *)buffer)[i]==0x00000000)break;//an unused cluster } if(i!=128) { cnt=cnt*128+i; return cnt;//return the free cluster number } } } else { for(cnt=0;cnt<FATsectors;cnt++)//find in the FAT table { if(FAT_ReadSector(FirstFATSector+cnt,buffer))return 1;//error for(i=0;i<256;i++) { if(((unsigned int *)buffer)[i]==0x0000)break;//an unused cluster } if(i!=256) { cnt=cnt*256+i; return cnt;//return the free cluster number } } } return 1;/