Diff: SDFileSystem/SDFileSystem.h

Revision:

4:95e30a911d97

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/SDFileSystem/SDFileSystem.h	Thu Apr 19 19:59:54 2018 +0000
@@ -0,0 +1,194 @@
+/* SD/MMC File System Library
+ * Copyright (c) 2016 Neil Thiessen
+ * Modified for the use with STM32F746 Discovery (C) 2016 Dieter Greaf
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef SD_FILE_SYSTEM_H
+#define SD_FILE_SYSTEM_H
+
+#include "mbed.h"
+#include "stm32746g_discovery_sd.h"
+#include "FATFileSystem.h"
+
+/** SDFileSystem class.
+ *  Used for creating a virtual file system for accessing SD/MMC cards via SPI.
+ *
+ * Example:
+ * @code
+ * #include "mbed.h"
+ * #include "SDFileSystem.h"
+ *
+ * //Create an SDFileSystem object
+ * SDFileSystem sd("sd");
+ *
+ * int main()
+ * {
+ *     //Mount the filesystem
+ *     sd.mount();
+ *
+ *     //Perform a write test
+ *     printf("\nWriting to SD card...");
+ *     FILE *fp = fopen("/sd/sdtest.txt", "w");
+ *     if (fp != NULL) {
+ *         fprintf(fp, "We're writing to an SD card!");
+ *         fclose(fp);
+ *         printf("success!\n");
+ *     } else {
+ *         printf("failed!\n");
+ *     }
+ *
+ *     //Perform a read test
+ *     printf("Reading from SD card...");
+ *     fp = fopen("/sd/sdtest.txt", "r");
+ *     if (fp != NULL) {
+ *         char c = fgetc(fp);
+ *         if (c == 'W')
+ *             printf("success!\n");
+ *         else
+ *             printf("incorrect char (%c)!\n", c);
+ *         fclose(fp);
+ *     } else {
+ *         printf("failed!\n");
+ *     }
+ *
+ *     //Unmount the filesystem
+ *     sd.unmount();
+ * }
+ * @endcode
+
+ */
+ #define CMD59  (0x40 | 59)
+using namespace mbed;
+
+class SDFileSystem : public FATFileSystem
+{
+public:
+    /** Represents the different card detect switch types
+     */
+    enum SwitchType {
+        SWITCH_NONE,    /**< No card detect switch (assumes socket is always occupied) */
+        SWITCH_POS_NO,  /**< Switch shorts to VDD when the socket is occupied (positive logic, normally open) */
+        SWITCH_POS_NC,  /**< Switch shorts to VDD when the socket is empty (positive logic, normally closed) */
+        SWITCH_NEG_NO,  /**< Switch shorts to GND when the socket is occupied (negative logic, normally open) */
+        SWITCH_NEG_NC   /**< Switch shorts to GND when the socket is empty (negative logic, normally closed) */
+    };
+
+    /** Represents the different SD/MMC card types
+     */
+    enum CardType {
+        CARD_NONE,      /**< No card is present */
+        CARD_MMC,       /**< MMC card */
+        CARD_SD,        /**< Standard capacity SD card */
+        CARD_SDHC,      /**< High capacity SD card */
+        CARD_UNKNOWN    /**< Unknown or unsupported card */
+    };
+
+    /** Create a virtual file system for accessing SD/MMC cards via SPI
+     *
+     * @param mosi The SPI data out pin.
+     * @param miso The SPI data in pin.
+     * @param sclk The SPI clock pin.
+     * @param cs The SPI chip select pin.
+     * @param name The name used to access the virtual filesystem.
+     * @param cd The card detect pin.
+     * @param cdtype The type of card detect switch.
+     * @param hz The SPI bus frequency (defaults to 1MHz).
+     */
+    SDFileSystem( const char* name);
+
+    /** Determine whether or not a card is present
+     *
+     * @returns
+     *   'true' if a card is present,
+     *   'false' if no card is present.
+     */
+    bool card_present();
+
+    /** Get the detected SD/MMC card type
+     *
+     * @returns The detected card type as a CardType enum.
+     *
+     * @note Valid after the filesystem has been mounted.
+     */
+    SDFileSystem::CardType card_type();
+
+    /** Get whether or not CRC is enabled for commands and data
+     *
+     * @returns
+     *   'true' if CRC is enabled for commands and data,
+     *   'false' if CRC is disabled for commands and data.
+     */
+    bool crc();
+
+    /** Set whether or not CRC is enabled for commands and data
+     *
+     * @param enabled Whether or not to enable CRC for commands and data.
+     */
+    void crc(bool enabled);
+
+    /** Get whether or not 16-bit frames are enabled for data read/write operations
+     *
+     * @returns
+     *   'true' if 16-bit frames will be used during data read/write operations,
+     *   'false' if 8-bit frames will be used during data read/write operations.
+     */
+    bool large_frames();
+
+    /** Set whether or not 16-bit frames are enabled for data read/write operations
+     *
+     * @param enabled Whether or not 16-bit frames are enabled for data read/write operations.
+     */
+    void large_frames(bool enabled);
+
+    /** Get whether or not write validation is enabled for data write operations
+     *
+     * @returns
+     *   'true' if data writes will be verified using CMD13,
+     *   'false' if data writes will not be verified.
+     */
+    bool write_validation();
+
+    /** Set whether or not write validation is enabled for data write operations
+     *
+     * @param enabled Whether or not write validation is enabled for data write operations.
+     */
+    void write_validation(bool enabled);
+
+    virtual int unmount();
+    virtual int disk_initialize();
+    virtual int disk_status();
+    virtual int disk_read(uint8_t* buffer, uint32_t sector, uint32_t count);
+    virtual int disk_write(const uint8_t* buffer, uint32_t sector, uint32_t count);
+    virtual int disk_sync();
+    virtual uint32_t disk_sectors();
+
+private:
+    Timer m_Timer;
+    InterruptIn m_Cd;
+    int m_CdAssert;
+    SDFileSystem::CardType m_CardType;
+    bool m_Crc;
+    bool m_LargeFrames;
+    bool m_WriteValidation;
+    int m_Status;
+    HAL_SD_CardInfoTypedef m_CardInfo;
+    //Internal methods
+    void onCardRemoval();
+    void checkSocket();
+    void DMA2_Stream3_IRQHandler();
+    void DMA2_Stream6_IRQHandler();
+    void SDMMC1_IRQHandler();
+};
+
+#endif