基于stm32和vs1003的mp3播放器设计与实现MDK

#include"FAT.h" DWORD FirstDirClust; //第一个目录簇号 DWORD FirstDataSector; // 数据区的第一个扇区 WORD BytesPerSector; // 每扇区字节数 DWORD FATsectors; // 一个FAT表所占扇区数 WORD SectorsPerClust; // 每簇扇区数 DWORD FirstFATSector; // 第一个FAT表所在扇区 DWORD FirstDirSector; // 第一个目录扇区 DWORD RootDirSectors; // 根目录所在扇区 DWORD RootDirCount; // 根目录下目录项数 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; //显示一次数据流 void show_data(u8 *p,u16 num) { u16 i=0; printf("TEMP DATA:\n"); delay_ms(1000); for(i=0;i<num;i++)printf(" %x",*p++); printf("\ndata over\n"); } 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 = SD_GetCapacity(); if(Capacity<0xff)return 1; if(SD_ReadSingleBlock(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(SD_ReadSingleBlock(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(SD_ReadSingleBlock(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表占用的扇区数 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(SD_ReadSingleBlock(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(SD_ReadSingleBlock(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(SD_ReadSingleBlock(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 } //显示给定路径下的文件 //display the content of a foler , 0 as root directory unsigned char FAT_DisDir(BYTE *dir) { BYTE *buffer; DWORD sector; DWORD cluster; DWORD tempclust; unsigned int cnt; unsigned int offset; unsigned char i; struct direntry *item = 0; cluster = FAT_OpenDir(dir); if(cluster == 1)return 1; if(cluster==0 && FAT32_Enable==0)// root directory { buffer=malloc(512);//apply memory if(buffer==0)return 1;//if failed for(cnt=0;cnt<RootDirSectors;cnt++) { if(SD_ReadSingleBlock(FirstDirSector+cnt,buffer)){free(buffer);return 1;} for(offset=0;offset<512;offset+=32) { item=(struct direntry *)(&buffer[offset]);//pointer convert //find a valid item and display it if((item->deName[0] != '.') && (item->deName[0] != 0x00) && (item->deName[0] != 0xe5) && (item->deAttributes != 0x0f)) { putchar(0x0d); putchar(0x0a); for(i=0;i<8;i++)//name { putchar(item->deName[i]); } if((item->deAttributes & 0x10)==0)putchar('.'); for(i=0;i<3;i++)//extention { putchar(item->deExtension[i]); } } } } free(buffer);//release } else//other folders { tempclust=cluster; while(1) { sector=(DWORD)FirstDataSector+(DWORD)(tempclust-2)*(DWORD)SectorsPerClust;//calculate the actual sector number buffer=malloc(512);//apply memory if(buffer==0)return 1;//if failed for(cnt=0;cnt<SectorsPerClust;cnt++) { if(SD_ReadSingleBlock(sector+cnt,buffer)){free(buffer);return 1;} for(offset=0;offset<512;offset+=32) { item=(struct direntry *)(&buffer[offset]); if((item->deName[0] != '.') && (item->deName[0] != 0x00) && (item->deName[0] != 0xe5) && (item->deAttributes != 0x0f)) { putchar(0x0d); putchar(0x0a); for(i=0;i<8;i++) { putchar(item->deName[i]); } if((item->deAttributes & 0x10)==0)putchar('.'); for(i=0;i<3;i++) { putchar(item->deExtension[i]); } } } } free(buffer);//release tempclust=FAT_NextCluster(tempclust);//next cluster if( tempclust == 0x0ffffff8 )return 1; if((FAT32_Enable == 0 && tempclust == 0xffff) || tempclust == 0x0fffffff)break; } } return 0; } //在给定目录下查找文件 //Find a item in the directory which specify by the parameter "cluster" //Return the start cluster number unsigned int FAT_FindItem(unsigned long cluster, BYTE *name, struct FileInfoStruct *FileInfo) { BYTE *buffer; DWORD tempclust; DWORD sector; unsigned int cnt; unsigned int offset; unsigned char i; struct direntry *item = 0; if((cluster==0) && (FAT32_Enable == 0))// root directory { buffer=malloc(512);//apply memory if(buffer==0)return 1;//if failed for(cnt=0;cnt<RootDirSectors;cnt++) { if(SD_ReadSingleBlock(FirstDirSector+cnt,buffer)){free(buffer);return 1;} for(offset=0;offset<512;offset+=32) { item=(struct direntry *)(&buffer[offset]); if((item->deName[0] != 0x00) && (item->deName[0] != 0xe5) && (item->deAttributes != 0x0f)) { for(i=0;i<11;i++) { if(buffer[offset+i]!=name[i])break; } if(i==11) { //return the parameter of the item FileInfo->StartCluster = item->deStartCluster + (((unsigned long)item->deHighClust)<<16);//don't care FileInfo->Size = item->deFileSize; FileInfo->Attr = item->deAttributes; FileInfo->Sector = FirstDirSector+cnt; FileInfo