USBMSD_SD.h

00001 /* mbed USBMSD_SD Library, for providing file access to SD cards
00002  * Copyright (c) 2008-2010, sford
00003  *
00004  * Permission is hereby granted, free of charge, to any person obtaining a copy
00005  * of this software and associated documentation files (the "Software"), to deal
00006  * in the Software without restriction, including without limitation the rights
00007  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
00008  * copies of the Software, and to permit persons to whom the Software is
00009  * furnished to do so, subject to the following conditions:
00010  *
00011  * The above copyright notice and this permission notice shall be included in
00012  * all copies or substantial portions of the Software.
00013  *
00014  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
00015  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
00016  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
00017  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
00018  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
00019  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
00020  * THE SOFTWARE.
00021  */
00022 
00023 #ifndef USBMSD_SD_H
00024 #define USBMSD_SD_H
00025 
00026 #include "mbed.h"
00027 #include "USBMSD.h"
00028 
00029 /** Use the SDcard as mass storage device using the USBMSD class
00030  *
00031  * @code
00032  * #include "mbed.h"
00033  * #include "USBMSD_SD.h"
00034  *
00035  * USBMSD_SD sd(p5, p6, p7, p8);
00036  *
00037  * int main() {
00038  *   while(1);
00039  * }
00040  *
00041  * @endcode
00042  */
00043 class USBMSD_SD : public USBMSD {
00044 public:
00045 
00046     /** Create the File System for accessing an SD Card using SPI
00047      *
00048      * @param mosi SPI mosi pin connected to SD Card
00049      * @param miso SPI miso pin conencted to SD Card
00050      * @param sclk SPI sclk pin connected to SD Card
00051      * @param cs   DigitalOut pin used as SD Card chip select
00052      * @param name The name used to access the virtual filesystem
00053      */
00054     USBMSD_SD(PinName mosi, PinName miso, PinName sclk, PinName cs);
00055     virtual int disk_initialize();
00056     virtual int disk_status();
00057     //count arg added by bobk into disk_read() and disk_write()
00058     virtual int disk_read(uint8_t * buffer, uint64_t block_number, uint8_t count);
00059     virtual int disk_write(const uint8_t * buffer, uint64_t block_number, uint8_t count);
00060     virtual int disk_sync();
00061     virtual uint64_t disk_sectors();
00062     
00063     virtual uint64_t disk_size(){return _sectors*512;};
00064 
00065 protected:
00066 
00067     int _cmd(int cmd, int arg);
00068     int _cmdx(int cmd, int arg);
00069     int _cmd8();
00070     int _cmd58();
00071     int initialise_card();
00072     int initialise_card_v1();
00073     int initialise_card_v2();
00074     
00075     int _read(uint8_t * buffer, uint32_t length);
00076     int _write(const uint8_t *buffer, uint32_t length);
00077     uint64_t _sd_sectors();
00078     uint64_t _sectors;
00079     
00080     uint8_t _status;
00081     
00082     SPI _spi;
00083     DigitalOut _cs;
00084     int cdv;
00085 };
00086 
00087 #endif