SDFlashDisk.h

00001 /*
00002  *  This file is derived from the standard MBED SDFileSystem.h file
00003  *  The class defined here provides only low-level block access to the flash disk, with no filesystem.
00004  *  
00005  *  Modifications by John VanLaanen, June 2013
00006 */
00007 
00008 // Header from original file:
00009 
00010 /* mbed Microcontroller Library
00011  * Copyright (c) 2006-2012 ARM Limited
00012  *
00013  * Permission is hereby granted, free of charge, to any person obtaining a copy
00014  * of this software and associated documentation files (the "Software"), to deal
00015  * in the Software without restriction, including without limitation the rights
00016  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
00017  * copies of the Software, and to permit persons to whom the Software is
00018  * furnished to do so, subject to the following conditions:
00019  *
00020  * The above copyright notice and this permission notice shall be included in
00021  * all copies or substantial portions of the Software.
00022  *
00023  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
00024  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
00025  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
00026  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
00027  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
00028  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
00029  * SOFTWARE.
00030  */
00031  
00032 #ifndef MBED_SDFLASHDISK_H
00033 #define MBED_SDFLASHDISK_H
00034  
00035 #include "mbed.h"
00036 #include <stdint.h>
00037  
00038 /** Access to an SD Flash Card using SPI
00039  *
00040  * @code
00041  * #include "mbed.h"
00042  * #include "SDFlashDisk.h"
00043  *
00044  * SDFlashDisk sd(p5, p6, p7, p12); // mosi, miso, sclk, cs
00045  *  
00046  * }
00047  */
00048 class SDFlashDisk {
00049 public:
00050  
00051     /** Create the object for accessing an SD Card using SPI
00052      *
00053      * @param mosi SPI mosi pin connected to SD Card
00054      * @param miso SPI miso pin conencted to SD Card
00055      * @param sclk SPI sclk pin connected to SD Card
00056      * @param cs   DigitalOut pin used as SD Card chip select
00057      */
00058     SDFlashDisk(PinName mosi, PinName miso, PinName sclk, PinName cs);
00059     virtual int disk_initialize();
00060     virtual int disk_read(uint8_t * buffer, uint64_t block_number);
00061     virtual int disk_write(const uint8_t * buffer, uint64_t block_number);
00062     virtual uint64_t disk_sectors();
00063  
00064 protected:
00065  
00066     int _cmd(int cmd, int arg);
00067     int _cmdx(int cmd, int arg);
00068     int _cmd8();
00069     int _cmd58();
00070     int initialise_card();
00071     int initialise_card_v1();
00072     int initialise_card_v2();
00073     
00074     int _read(uint8_t * buffer, uint32_t length);
00075     int _write(const uint8_t *buffer, uint32_t length);
00076     uint64_t _sd_sectors();
00077     uint64_t _sectors;
00078     
00079     SPI _spi;
00080     DigitalOut _cs;
00081     int cdv;
00082 };
00083  
00084 #endif  // MBED_SDFLASHDISK_H
00085