Diff: USBMSD/USBMSD.h

Revision:

17:364ef42e502d

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+++ b/USBMSD/USBMSD.h	Sun Dec 11 15:07:59 2011 +0000
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+/* Copyright (c) 2010-2011 mbed.org, MIT License
+*
+* 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.
+*/
+
+/* Introduction
+ * ------------
+ * The USBMSD implements the MSD protocol. It permits to access a memory chip (flash, sdcard,...)
+ * from a computer over USB. But this class doesn't work standalone, you need to subclass this class
+ * and define virtual functions which are called in USBMSD.
+ *
+ * How to use this class with your chip ?
+ * --------------------------------------
+ * You have to inherit and define some pure virtual functions (mandatory step):
+ *   - virtual int disk_read(char * data, int block): function to read a block
+ *   - virtual int disk_write(const char * data, int block): function to write a block
+ *   - virtual int disk_initialize(): function to initialize the memory
+ *   - virtual int disk_sectors(): return the number of blocks
+ *   - virtual int disk_size(): return the memory size
+ *
+ * All functions names are compatible with the fat filesystem library. So you can imagine using your own class with either
+ * USBMSD or a fat filesystem library.
+ *
+ * Once these functions have been defined, you can call connect() (at the end of the constructor of your class for instance)
+ * of USBMSD to connect your mass storage device ;)
+ */
+
+#ifndef USBMSD_H
+#define USBMSD_H
+
+/* These headers are included for child class. */
+#include "USBEndpoints.h"
+#include "USBDescriptor.h"
+#include "USBDevice_Types.h"
+
+#include "USBDevice.h"
+
+#define DEFAULT_CONFIGURATION (1)
+
+
+// MSC Bulk-only Stage
+enum Stage {
+    READ_CBW,     // wait a CBW
+    ERROR,        // error
+    PROCESS_CBW,  // process a CBW request
+    SEND_CSW,     // send a CSW
+    WAIT_CSW,     // wait that a CSW has been effectively sent
+};
+
+// Bulk-only CBW
+typedef __packed struct {
+    uint32_t Signature;
+    uint32_t Tag;
+    uint32_t DataLength;
+    uint8_t  Flags;
+    uint8_t  LUN;
+    uint8_t  CBLength;
+    uint8_t  CB[16];
+} CBW;
+
+// Bulk-only CSW
+typedef __packed struct {
+    uint32_t Signature;
+    uint32_t Tag;
+    uint32_t DataResidue;
+    uint8_t  Status;
+} CSW;
+
+
+class USBMSD: public USBDevice {
+public:
+
+    /**
+    * Constructor
+    *
+    * @param vendor_id Your vendor_id
+    * @param product_id Your product_id
+    * @param product_release Your preoduct_release
+    */
+    USBMSD(uint16_t vendor_id = 0x0703, uint16_t product_id = 0x0104, uint16_t product_release = 0x0001);
+
+    /*
+    * read a block on a storage chip
+    *
+    * @param data pointer where will be stored read data
+    * @param block block number
+    * @returns 0 if successful
+    */
+    virtual int disk_read(char * data, int block) = 0;
+
+    /*
+    * write a block on a storage chip
+    *
+    * @param data data to write
+    * @param block block number
+    * @returns 0 if successful
+    */
+    virtual int disk_write(const char * data, int block) = 0;
+
+    /*
+    * Disk initilization
+    */
+    virtual int disk_initialize() = 0;
+
+    /*
+    * Return the number of blocks
+    *
+    * @returns number of blocks
+    */
+    virtual int disk_sectors() = 0;
+
+    /*
+    * Return memory size
+    *
+    * @returns memory size
+    */
+    virtual int disk_size() = 0;
+
+    /*
+    * Connect the USB MSD device. Establish disk initialization before really connect the device.
+    *
+    * @returns
+    */
+    bool connect();
+
+
+protected:
+
+
+    /*
+    * Get number of logical unit - 1 (here 0)
+    *
+    * @returns Pointer containing the number of logical unit - 1
+    */
+    uint8_t * getMaxLUN();
+
+    /*
+    * Get string product descriptor
+    *
+    * @returns pointer to the string product descriptor
+    */
+    virtual uint8_t * stringIproductDesc();
+
+    /*
+    * Get string interface descriptor
+    *
+    * @returns pointer to the string interface descriptor
+    */
+    virtual uint8_t * stringIinterfaceDesc();
+
+    /*
+    * Get configuration descriptor
+    *
+    * @returns pointer to the configuration descriptor
+    */
+    virtual uint8_t * configurationDesc();
+
+    /*
+    * Callback called when a packet is received
+    */
+    virtual bool EP2_OUT_callback();
+
+    /*
+    * Callback called when a packet has been sent
+    */
+    virtual bool EP2_IN_callback();
+
+    /*
+    * Set configuration of device. Add endpoints
+    */
+    virtual bool USBCallback_setConfiguration(uint8_t configuration);
+
+    /*
+    * Callback called to process class specific requests
+    */
+    virtual bool USBCallback_request();
+
+
+private:
+    //state of the bulk-only state machine
+    Stage stage;
+
+    // current CBW
+    CBW cbw;
+
+    // CSW which will be sent
+    CSW csw;
+
+    // addr where will be read or written data
+    uint32_t addr;
+
+    // length of a reading or writing
+    uint32_t length;
+
+    // memory OK (after a memoryVerify)
+    bool memOK;
+
+    // cache in RAM before writing in memory. Useful also to read a block.
+    uint8_t * page;
+
+    int BlockSize;
+    int MemorySize;
+    int BlockCount;
+
+    void CBWDecode(uint8_t * buf, uint16_t size);
+    void sendCSW (void);
+    bool inquiryRequest (void);
+    bool write (uint8_t * buf, uint16_t size);
+    bool readFormatCapacity();
+    bool readCapacity (void);
+    bool infoTransfer (void);
+    void memoryRead (void);
+    bool modeSense6 (void);
+    void testUnitReady (void);
+    bool requestSense (void);
+    void memoryVerify (uint8_t * buf, uint16_t size);
+    void memoryWrite (uint8_t * buf, uint16_t size);
+    void reset();
+    void fail();
+};
+
+#endif
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