SDFileSystem.h

00001 /* mbed Microcontroller Library - SDFileSystem
00002  * Copyright (c) 2008-2009, sford
00003  */
00004 
00005 #ifndef SDFILESYSTEM_H
00006 #define SDFILESYSTEM_H
00007 
00008 #include "mbed.h"
00009 #include "FATFileSystem.h"
00010 
00011 /* Class: SDFileSystem
00012  *  Access the filesystem on an SD Card using SPI
00013  *
00014  * Example:
00015  * > SDFileSystem sd(p5, p6, p7, p12, "sd");
00016  * > 
00017  * > int main() {
00018  * >     FILE *fp = fopen("/sd/myfile.txt", "w");
00019  * >     fprintf(fp, "Hello World!\n");
00020  * >     fclose(fp);
00021  * > }
00022  */
00023 class SDFileSystem : public FATFileSystem {
00024 public:
00025 
00026     /* Constructor: SDFileSystem
00027      *  Create the File System for accessing an SD Card using SPI
00028      *
00029      * Variables:
00030      *  mosi - SPI mosi pin connected to SD Card
00031      *  miso - SPI miso pin conencted to SD Card
00032      *  sclk - SPI sclk pin connected to SD Card
00033      *  cs   - DigitalOut pin used as SD Card chip select
00034    *  name - The name used to access the filesystem
00035      */
00036     SDFileSystem(PinName mosi, PinName miso, PinName sclk, PinName cs, const char* name);
00037     virtual int disk_initialize();
00038     virtual int disk_write(const char *buffer, int block_number);
00039     virtual int disk_read(char *buffer, int block_number);  
00040     virtual int disk_status();
00041     virtual int disk_sync();
00042     virtual int disk_sectors();
00043 
00044 protected:
00045 
00046     int _cmd(int cmd, int arg);
00047     int _read(char *buffer, int length);
00048     int _write(const char *buffer, int length);
00049     int _sd_sectors();
00050     int _sectors;
00051     
00052     SPI _spi;
00053     DigitalOut _cs;  
00054 };
00055 
00056 #endif