this library has few changes from the original library, for effects of this work.
Diff: SDFileSystem.h
- Revision:
- 0:8214896432e0
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/SDFileSystem.h Mon May 21 15:10:37 2018 +0000 @@ -0,0 +1,89 @@ +/* mbed Microcontroller Library + * Copyright (c) 2006-2012 ARM Limited + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + * SOFTWARE. + */ +#ifndef MBED_SDFILESYSTEM_H +#define MBED_SDFILESYSTEM_H + +#include "mbed.h" +#include "FATFileSystem.h" +#include <stdint.h> + +/** Access the filesystem on an SD Card using SPI + * + * @code + * #include "mbed.h" + * #include "SDFileSystem.h" + * + * SDFileSystem sd(p5, p6, p7, p12, "sd"); // mosi, miso, sclk, cs + * + * int main() { + * FILE *fp = fopen("/sd/myfile.txt", "w"); + * fprintf(fp, "Hello World!\n"); + * fclose(fp); + * } + */ +class SDFileSystem : public FATFileSystem { +public: + + /** Create the File System for accessing an SD Card using SPI + * + * @param mosi SPI mosi pin connected to SD Card + * @param miso SPI miso pin conencted to SD Card + * @param sclk SPI sclk pin connected to SD Card + * @param cs DigitalOut pin used as SD Card chip select + * @param name The name used to access the virtual filesystem + */ + SDFileSystem(PinName mosi, PinName miso, PinName sclk, PinName cs, const char* name); + virtual int disk_initialize(); + virtual int disk_status(); + virtual int disk_read(uint8_t* buffer, uint32_t block_number, uint32_t count); + virtual int disk_write(const uint8_t* buffer, uint32_t block_number, uint32_t count); + virtual int disk_sync(); + virtual uint32_t disk_sectors(); + +protected: + + int _cmd(int cmd, int arg); + int _cmdx(int cmd, int arg); + int _cmd8(); + int _cmd58(); + int initialise_card(); + int initialise_card_v1(); + int initialise_card_v2(); + + int _read(uint8_t * buffer, uint32_t length); + int _write(const uint8_t *buffer, uint32_t length); + uint32_t _sd_sectors(); + uint32_t _sectors; + + void set_init_sck(uint32_t sck) { _init_sck = sck; } + // Note: The highest SPI clock rate is 20 MHz for MMC and 25 MHz for SD + void set_transfer_sck(uint32_t sck) { _transfer_sck = sck; } + uint32_t _init_sck; + uint32_t _transfer_sck; + + SPI _spi; + DigitalOut _cs; + int cdv; + int _is_initialized; +}; + +#endif \ No newline at end of file