SD Card Interface class. Log raw data bytes to memory addresses of your choice, or format the card and use the FAT file system to write files.
SDCard.h
- Committer:
- Blaze513
- Date:
- 2010-08-07
- Revision:
- 1:94c648931f84
- Parent:
- 0:f3870f76a890
- Child:
- 3:210eb67b260c
File content as of revision 1:94c648931f84:
#ifndef SDCardLibrary #define SDCardLibrary #include "stdint.h" #include "mbed.h" #include "FATFileSystem.h" class SDCard : private FATFileSystem { private: SPI DataLines; DigitalOut ChipSelect; //physical chip interface unsigned char CommandCRCTable[256]; //CRC7 lookup table unsigned char DataCRCTable[512]; //CRC CCITT lookup table unsigned char OCR[4]; //operating condition register unsigned char CSD[16]; //card-specific data register unsigned char FSR[64]; //function status register bool Version; //card version, low for 1, high for 2 bool Capacity; //low for low-capacity, high for high-capacity bool CRCMode; //low to disable CRCs, high to enable CRCs unsigned char Workspace[5]; //all-purpose work area unsigned int Timeout; unsigned int t; //timeout limit and counter unsigned char Initialize(); //complete all initialization operations void Command(unsigned char Index, unsigned int Argument, unsigned char* Response); //sends command to the SD card void CommandCRC(unsigned char* IndexPtr, unsigned int* ArgumentPtr, unsigned char* Result); void DataCRC(unsigned short Length, unsigned char* Data, unsigned char* Result); //calculates the CRC result of the input with a lookup table void GenerateCRCTable(unsigned char Size, unsigned long long Generator, unsigned char* Table); //pre-calculates CRC results for efficient checking virtual unsigned char disk_initialize(); virtual unsigned char disk_status(); virtual unsigned char disk_read(unsigned char* buff, unsigned long sector, unsigned char count); virtual unsigned char disk_write(const unsigned char* buff, unsigned long sector, unsigned char count); virtual unsigned char disk_sync(); virtual unsigned long disk_sector_count(); virtual unsigned short disk_sector_size(); virtual unsigned long disk_block_size(); //FAT system virtual function definitions, called by FAT module public: SDCard(PinName mosi, PinName miso, PinName sck, PinName cs, const char* DiskName); //constructor requires SPI and DigitalOut pins, and a directory name unsigned char Log(unsigned char Control, unsigned char Data); //multipurpose raw data-logging method with three modes of operation //Control description // 0 synchronizes card and resets internal counter to finalize I/O operations // 1 successive write input Data to a raw data byte in order starting at address 0 // 2 successively read and return a raw data byte in order starting at address 0 //return data from sync or write operations, and input data of sync or read operations are //"don't care" bits unsigned char Write(unsigned int Address, unsigned char* Data); unsigned char Write(unsigned int Address, unsigned char SectorCount, unsigned char* Data); //write data sectors to the card unsigned char Read(unsigned int Address, unsigned char* Data); unsigned char Read(unsigned int Address, unsigned char SectorCount, unsigned char* Data); //read data sectors from the card unsigned char SelectCRCMode(bool Mode); //turn CRC mode on or off, default is off }; #endif