Emilia Marino / SDFileSystem

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SDFileSystem.h@0:5f7b02d095c2, 2021-12-18 (annotated)

Committer:
emiliamarino
Date:
Sat Dec 18 20:17:31 2021 +0000
Revision:
0:5f7b02d095c2
Assignment 4

Who changed what in which revision?

UserRevisionLine numberNew contents of line
emiliamarino 0:5f7b02d095c2 1 /* mbed Microcontroller Library
emiliamarino 0:5f7b02d095c2 2 * Copyright (c) 2006-2012 ARM Limited
emiliamarino 0:5f7b02d095c2 3 *
emiliamarino 0:5f7b02d095c2 4 * Permission is hereby granted, free of charge, to any person obtaining a copy
emiliamarino 0:5f7b02d095c2 5 * of this software and associated documentation files (the "Software"), to deal
emiliamarino 0:5f7b02d095c2 6 * in the Software without restriction, including without limitation the rights
emiliamarino 0:5f7b02d095c2 7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
emiliamarino 0:5f7b02d095c2 8 * copies of the Software, and to permit persons to whom the Software is
emiliamarino 0:5f7b02d095c2 9 * furnished to do so, subject to the following conditions:
emiliamarino 0:5f7b02d095c2 10 *
emiliamarino 0:5f7b02d095c2 11 * The above copyright notice and this permission notice shall be included in
emiliamarino 0:5f7b02d095c2 12 * all copies or substantial portions of the Software.
emiliamarino 0:5f7b02d095c2 13 *
emiliamarino 0:5f7b02d095c2 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
emiliamarino 0:5f7b02d095c2 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
emiliamarino 0:5f7b02d095c2 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
emiliamarino 0:5f7b02d095c2 17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
emiliamarino 0:5f7b02d095c2 18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
emiliamarino 0:5f7b02d095c2 19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
emiliamarino 0:5f7b02d095c2 20 * SOFTWARE.
emiliamarino 0:5f7b02d095c2 21 */
emiliamarino 0:5f7b02d095c2 22 #ifndef MBED_SDFILESYSTEM_H
emiliamarino 0:5f7b02d095c2 23 #define MBED_SDFILESYSTEM_H
emiliamarino 0:5f7b02d095c2 24
emiliamarino 0:5f7b02d095c2 25 #include "mbed.h"
emiliamarino 0:5f7b02d095c2 26 #include "FATFileSystem.h"
emiliamarino 0:5f7b02d095c2 27 #include <stdint.h>
emiliamarino 0:5f7b02d095c2 28
emiliamarino 0:5f7b02d095c2 29 /** Access the filesystem on an SD Card using SPI
emiliamarino 0:5f7b02d095c2 30 *
emiliamarino 0:5f7b02d095c2 31 * @code
emiliamarino 0:5f7b02d095c2 32 * #include "mbed.h"
emiliamarino 0:5f7b02d095c2 33 * #include "SDFileSystem.h"
emiliamarino 0:5f7b02d095c2 34 *
emiliamarino 0:5f7b02d095c2 35 * SDFileSystem sd(p5, p6, p7, p12, "sd"); // mosi, miso, sclk, cs
emiliamarino 0:5f7b02d095c2 36 *
emiliamarino 0:5f7b02d095c2 37 * int main() {
emiliamarino 0:5f7b02d095c2 38 * FILE *fp = fopen("/sd/myfile.txt", "w");
emiliamarino 0:5f7b02d095c2 39 * fprintf(fp, "Hello World!\n");
emiliamarino 0:5f7b02d095c2 40 * fclose(fp);
emiliamarino 0:5f7b02d095c2 41 * }
emiliamarino 0:5f7b02d095c2 42 */
emiliamarino 0:5f7b02d095c2 43 class SDFileSystem : public FATFileSystem {
emiliamarino 0:5f7b02d095c2 44 public:
emiliamarino 0:5f7b02d095c2 45
emiliamarino 0:5f7b02d095c2 46 /** Create the File System for accessing an SD Card using SPI
emiliamarino 0:5f7b02d095c2 47 *
emiliamarino 0:5f7b02d095c2 48 * @param mosi SPI mosi pin connected to SD Card
emiliamarino 0:5f7b02d095c2 49 * @param miso SPI miso pin conencted to SD Card
emiliamarino 0:5f7b02d095c2 50 * @param sclk SPI sclk pin connected to SD Card
emiliamarino 0:5f7b02d095c2 51 * @param cs DigitalOut pin used as SD Card chip select
emiliamarino 0:5f7b02d095c2 52 * @param name The name used to access the virtual filesystem
emiliamarino 0:5f7b02d095c2 53 */
emiliamarino 0:5f7b02d095c2 54 SDFileSystem(PinName mosi, PinName miso, PinName sclk, PinName cs, const char* name);
emiliamarino 0:5f7b02d095c2 55 virtual int disk_initialize();
emiliamarino 0:5f7b02d095c2 56 virtual int disk_status();
emiliamarino 0:5f7b02d095c2 57 virtual int disk_read(uint8_t* buffer, uint32_t block_number, uint32_t count);
emiliamarino 0:5f7b02d095c2 58 virtual int disk_write(const uint8_t* buffer, uint32_t block_number, uint32_t count);
emiliamarino 0:5f7b02d095c2 59 virtual int disk_sync();
emiliamarino 0:5f7b02d095c2 60 virtual uint32_t disk_sectors();
emiliamarino 0:5f7b02d095c2 61
emiliamarino 0:5f7b02d095c2 62 protected:
emiliamarino 0:5f7b02d095c2 63
emiliamarino 0:5f7b02d095c2 64 int _cmd(int cmd, int arg);
emiliamarino 0:5f7b02d095c2 65 int _cmdx(int cmd, int arg);
emiliamarino 0:5f7b02d095c2 66 int _cmd8();
emiliamarino 0:5f7b02d095c2 67 int _cmd58();
emiliamarino 0:5f7b02d095c2 68 int initialise_card();
emiliamarino 0:5f7b02d095c2 69 int initialise_card_v1();
emiliamarino 0:5f7b02d095c2 70 int initialise_card_v2();
emiliamarino 0:5f7b02d095c2 71
emiliamarino 0:5f7b02d095c2 72 int _read(uint8_t * buffer, uint32_t length);
emiliamarino 0:5f7b02d095c2 73 int _write(const uint8_t *buffer, uint32_t length);
emiliamarino 0:5f7b02d095c2 74 uint32_t _sd_sectors();
emiliamarino 0:5f7b02d095c2 75 uint32_t _sectors;
emiliamarino 0:5f7b02d095c2 76
emiliamarino 0:5f7b02d095c2 77 void set_init_sck(uint32_t sck) { _init_sck = sck; }
emiliamarino 0:5f7b02d095c2 78 // Note: The highest SPI clock rate is 20 MHz for MMC and 25 MHz for SD
emiliamarino 0:5f7b02d095c2 79 void set_transfer_sck(uint32_t sck) { _transfer_sck = sck; }
emiliamarino 0:5f7b02d095c2 80 uint32_t _init_sck;
emiliamarino 0:5f7b02d095c2 81 uint32_t _transfer_sck;
emiliamarino 0:5f7b02d095c2 82
emiliamarino 0:5f7b02d095c2 83 SPI _spi;
emiliamarino 0:5f7b02d095c2 84 DigitalOut _cs;
emiliamarino 0:5f7b02d095c2 85 int cdv;
emiliamarino 0:5f7b02d095c2 86 int _is_initialized;
emiliamarino 0:5f7b02d095c2 87 };
emiliamarino 0:5f7b02d095c2 88
emiliamarino 0:5f7b02d095c2 89 #endif