90 lines
3.0 KiB
C++
90 lines
3.0 KiB
C++
/* mbed Microcontroller Library
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* Copyright (c) 2006-2012 ARM Limited
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#ifndef MBED_SDFILESYSTEM_H
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#define MBED_SDFILESYSTEM_H
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#include "mbed.h"
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#include "FATFileSystem.h"
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#include <stdint.h>
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/** Access the filesystem on an SD Card using SPI
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*
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* @code
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* #include "mbed.h"
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* #include "SDFileSystem.h"
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*
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* SDFileSystem sd(p5, p6, p7, p12, "sd"); // mosi, miso, sclk, cs
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*
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* int main() {
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* FILE *fp = fopen("/sd/myfile.txt", "w");
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* fprintf(fp, "Hello World!\n");
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* fclose(fp);
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* }
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*/
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class SDFileSystem : public FATFileSystem {
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public:
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/** Create the File System for accessing an SD Card using SPI
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*
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* @param mosi SPI mosi pin connected to SD Card
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* @param miso SPI miso pin conencted to SD Card
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* @param sclk SPI sclk pin connected to SD Card
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* @param cs DigitalOut pin used as SD Card chip select
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* @param name The name used to access the virtual filesystem
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*/
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SDFileSystem(PinName mosi, PinName miso, PinName sclk, PinName cs, const char* name);
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virtual int disk_initialize();
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virtual int disk_status();
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virtual int disk_read(uint8_t* buffer, uint64_t block_number, uint8_t count);
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virtual int disk_write(const uint8_t* buffer, uint64_t block_number, uint8_t count);
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virtual int disk_sync();
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virtual uint64_t disk_sectors();
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protected:
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int _cmd(int cmd, int arg);
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int _cmdx(int cmd, int arg);
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int _cmd8();
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int _cmd58();
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int initialise_card();
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int initialise_card_v1();
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int initialise_card_v2();
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int _read(uint8_t * buffer, uint32_t length);
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int _write(const uint8_t *buffer, uint32_t length);
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uint64_t _sd_sectors();
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uint64_t _sectors;
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void set_init_sck(uint32_t sck) { _init_sck = sck; }
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// Note: The highest SPI clock rate is 20 MHz for MMC and 25 MHz for SD
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void set_transfer_sck(uint32_t sck) { _transfer_sck = sck; }
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uint32_t _init_sck;
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uint32_t _transfer_sck;
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SPI _spi;
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DigitalOut _cs;
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int cdv;
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int _is_initialized;
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};
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#endif
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