请教文件系统学习问题

我想学习一下文件系统fatfs，看了些资料，准备实际动手操作一下，实现SD卡的操作，是不是这样一个模块就够了？

我看了这个模块配套的程序，感觉不是像网上说的那种 移植了文件系统的那样子啊。
并没有跑文件系统啊？
我买这个对么？
是不是说，这个只是测试了一下和SD卡的通信正常？如果需要对SD卡文件进行操作，还需要移植了文件系统才行？
附上程序，大家可以简单一看，只有这一个c文件
[C] 纯文本查看 复制代码
[C] 纯文本查看 复制代码
/* * SD模块测试程序 *  * 用途：SD模块测试程序 *  */#include "REG52.H"////////////////////////****************/unsigned char *SDInfo1="SD Init Success.";unsigned char *SDInfo2="SD Init Fail.";unsigned int xdata ReadBuffer[128]  ;unsigned int xdata WriteBuffer[128] ;unsigned int BlockSize;unsigned long int BlockNR;//***it sd_clk=P3^2;//***it sd_cse=P3^0;//***it sd_dai=P3^3; //Do//***it sd_dao=P3^1;  //DI ***it sd_cse=P1^0; ***it sd_dao=P1^1;//DI ***it sd_clk=P1^2; ***it sd_dai=P1^3;//Dovoid Delay5us(){unsigned char a=0;for(a=0;a<40;a++);}//********************************************void SD_2Byte_Write(unsigned int IOData){unsigned char BitCounter;for (BitCounter=0;BitCounter<16;BitCounter++){sd_clk=0;//CLK Lowif(IOData&0x8000)//If the MSB of IOData is 1, then Do=1, else Do=0.sd_dao=1;//Do Highelsesd_dao=0;//Do Lowsd_clk=1;//CLK HighDelay5us();IOData=IOData<<1;//Because the MSB is transmitted firstly, shift to next lower bit.}}//********************************************void SD_Write(unsigned int IOData){unsigned char BitCounter;IOData=IOData<<8;for (BitCounter=0;BitCounter<8;BitCounter++){sd_clk=0;//CLK Lowif(IOData&0x8000)//If the MSB of IOData is 1, then Do=1, else Do=0.sd_dao=1;//Do Highelsesd_dao=0;//Do Lowsd_clk=1;//CLK HighDelay5us();IOData=IOData<<1;//Because the MSB is transmitted firstly, shift to next lower bit.}}//********************************************unsigned int SD_2Byte_Read(){unsigned int Buffer;unsigned char BitCounter;Buffer=0;for (BitCounter=0;BitCounter<16;BitCounter++){sd_clk=0;//CLK LowDelay5us();sd_clk=1;//CLK HighBuffer=Buffer<<1;//Because the MSB is transmitted firstly, shift to next lower bit.                 //Because the LSB will be damaged, we can not put this line under next line.if(sd_dai) Buffer++;//If SPI_Din=1 then the LSB_of_Buffer=1.}return Buffer;}//********************************************unsigned int SD_Read(){unsigned int Buffer;unsigned char BitCounter;Buffer=0xffff;for (BitCounter=0;BitCounter<8;BitCounter++){sd_clk=0;//CLK LowDelay5us();sd_clk=1;//CLK HighBuffer=Buffer<<1;//Because the MSB is transmitted firstly, shift to next lower bit.                 //Because the LSB will be damaged, we can not put this line under next line.if(sd_dai) Buffer++;//If SPI_Din=1 then the LSB_of_Buffer=1.}return Buffer;}//********************************************unsigned int SD_CMD_Write(unsigned int CMDIndex,unsigned long CMDArg,unsigned int ResType,unsigned int CSLowRSV)//ResType:Response Type, send 1 for R1; send 2 for R1b; send 3 for R2.{//There are 7 steps need to do.(marked by [1]-[7])unsigned int temp,Response,Response2,CRC,Maximumtimes;Response2=0;MaximumTimes=10;CRC=0x0095;//0x0095 is only valid for CMD0if (CMDIndex!=0) CRC=0x00ff;sd_cse=0;//[1] CS LowSD_2Byte_Write(((CMDIndex|0x0040)<<8)+(CMDArg>>24));//[2] Transmit Command_Index & 1st Byte of Command_Argument.SD_2Byte_Write((CMDArg&0x00ffff00)>>8);//[2] 2nd & 3rd Byte of Command_ArgumentSD_2Byte_Write(((CMDArg&0x000000ff)<<8)+CRC);//[2] 4th Byte of Command_Argument & CRC only for CMD0sd_dao=1;//[3] Do High//[3] Restore Do to High Level for (temp=0;temp<8;temp++)//[4] Provide 8 extra clock after CMD{sd_clk=0;//CLK LowDelay5us();sd_clk=1;//CLK HighDelay5us();}switch (ResType)//[5] wait response{case 1://R1{doResponse=SD_Read();while (Response==0xffff);break;}case 2://R1b{doResponse=SD_Read();while (Response==0xffff);//Read R1 firstlydoResponse2=SD_Read()-0xff00;while (Response2!=0);//Wait until the Busy_Signal_Token is non-zerobreak;}case 3: Response=SD_2Byte_Read();break;//R2}if (CSLowRSV==0) sd_cse=1;//[6] CS High (if the CMD has data block response CS should be kept low)  for (temp=0;temp<8;temp++)//[7] Provide 8 extra clock after card response{sd_clk=0;//CLK LowDelay5us();sd_clk=1;//CLK HighDelay5us();}return Response;}//********************************************unsigned int SD_Reset_Card(){unsigned int temp,MaximumTimes;MaximumTimes=10;for (temp=0;temp<80;temp++)//Send 74+ Clocks{sd_clk=0;//CLK LowDelay5us();sd_clk=1;//CLK HighDelay5us();}return SD_CMD_Write(0x0000,0x00000000,1,0);//Send CMD0}//********************************************unsigned int SD_Initiate_Card()//Polling the card after reset{unsigned int temp,Response,MaximumTimes;MaximumTimes=50;for(temp=0;temp>14)&0x0003)+1;//Calcuate MULTBlockNR=BlockNR*(0x0002<<(((ReadBuffer[4]<<1)&0x0007)+((ReadBuffer[5]>>15)&0x0001)+1));//Calcuate Block_Numberreturn Response;}//********************************************unsigned int SD_Overall_Initiation(){unsigned int Response,Response_2;Response=0x0000;Response_2=0xff00;sd_dao=1;//[1] Do High//[1] Do must be High when there is no transmitiondoResponse=SD_Reset_Card();//[2] Send CMD0while (Response!=0xff01);if (Response!=0xff01) Response_2+=8;//Response=SD_CMD_Write(8,0x00000000,1,0);//Send CMD8Response=SD_Initiate_Card();//[3] Send CMD55+ACMD41 if (Response==0xff00);else{Response_2+=4;;}doResponse=SD_Get_CardInfo();//[4] Read CSDwhile (Response!=0xff00);if (Response==0xff01) Response_2+=2;return Response_2;//0000|0000||0000|0000 Response_2//                  |||_CSD Fail//                  ||__CMD55+ACMD41 Fail//                  |___CMD0 Fail}//********************************************unsigned int SD_Get_CardID()//Read CID register{unsigned int temp,Response,MaximumTimes;MaximumTimes=10;for(temp=0;tempBlockNR) return 0xff20;//whether BlockAddress out of range?for(temp=0;temp单片机能够读写SD卡，特意节省了RAM的使用量，每次读写只有两个重复的128byte//如果您使用的单片机拥有1K以上的RAM请将"%128"去掉for (temp=0;temp<256;temp++) ReadBuffer[temp%128]=SD_2Byte_Read();//Get the readed datafor (temp=0;temp<16;temp++)//Provide 16 clock to remove the last 2 bytes of data response (CRC){sd_clk=0;//CLK LowDelay5us();sd_clk=1;//CLK HighDelay5us();}sd_cse=1;//CS_High()for (temp=0;temp<8;temp++)//Provide 8 extra clock after data response{sd_clk=0;//CLK LowDelay5us();sd_clk=1;//CLK HighDelay5us();}return Response;}//********************************************unsigned int Write_Single_Block(unsigned long int BlockAddress){unsigned int temp,Response,MaximumTimes;MaximumTimes=10;if (BlockAddress>BlockNR) return 0xff20;//whether BlockAddress out of range?for(temp=0;temp=0x4141;  }  else  {  WriteBuffer=0x4242;  }}    UartInit(); TI = 0;    M_Response=0x0000; M_Response=SD_Overall_Initiation();M_Response=SD_CMD_Write(16,512,1,0);  Data=SD_Get_CardID(); Write_Single_Block(0x0000);    Read_Single_Block(0x0000);      for(i=0; i<128; i++){       send_char_com(ReadBuffer>>8)  ; //向串口发送高8位数据     send_char_com(ReadBuffer )  ; } while(1);  }

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