Demos/Device/LowLevel/MassStorage/MassStorage.h

   1 /*
   2              LUFA Library
   3      Copyright (C) Dean Camera, 2009.
   4
   5   dean [at] fourwalledcubicle [dot] com
   6       www.fourwalledcubicle.com
   7 */
   8
   9 /*
  10   Copyright 2009  Dean Camera (dean [at] fourwalledcubicle [dot] com)
  11
  12   Permission to use, copy, modify, and distribute this software
  13   and its documentation for any purpose and without fee is hereby
  14   granted, provided that the above copyright notice appear in all
  15   copies and that both that the copyright notice and this
  16   permission notice and warranty disclaimer appear in supporting
  17   documentation, and that the name of the author not be used in
  18   advertising or publicity pertaining to distribution of the
  19   software without specific, written prior permission.
  20
  21   The author disclaim all warranties with regard to this
  22   software, including all implied warranties of merchantability
  23   and fitness.  In no event shall the author be liable for any
  24   special, indirect or consequential damages or any damages
  25   whatsoever resulting from loss of use, data or profits, whether
  26   in an action of contract, negligence or other tortious action,
  27   arising out of or in connection with the use or performance of
  28   this software.
  29 */
  30
  31 /** \file
  32  *
  33  *  Header file for MassStorage.c.
  34  */
  35
  36 #ifndef _MASS_STORAGE_H_
  37 #define _MASS_STORAGE_H_
  38
  39         /* Includes: */
  40                 #include <avr/io.h>
  41                 #include <avr/wdt.h>
  42                 #include <avr/power.h>
  43
  44                 #include "Descriptors.h"
  45
  46                 #include "Lib/SCSI.h"
  47                 #include "Lib/DataflashManager.h"
  48
  49                 #include <LUFA/Version.h>                    // Library Version Information
  50                 #include <LUFA/Drivers/USB/USB.h>            // USB Functionality
  51                 #include <LUFA/Drivers/Board/LEDs.h>         // LEDs driver
  52                 #include <LUFA/Drivers/Board/Dataflash.h>    // Dataflash chip driver
  53                 #include <LUFA/Scheduler/Scheduler.h>        // Simple scheduler for task management
  54
  55         /* Macros: */
  56                 /** Mass Storage Class specific request to reset the Mass Storage interface, ready for the next command. */
  57                 #define REQ_MassStorageReset       0xFF
  58
  59                 /** Mass Storage Class specific request to retrieve the total number of Logical Units (drives) in the SCSI device. */
  60                 #define REQ_GetMaxLUN              0xFE
  61
  62                 /** Maximum length of a SCSI command which can be issued by the device or host in a Mass Storage bulk wrapper. */
  63                 #define MAX_SCSI_COMMAND_LENGTH    16
  64
  65                 /** Total number of Logical Units (drives) in the device. The total device capacity is shared equally between
  66                  *  each drive - this can be set to any positive non-zero amount.
  67                  */
  68                 #define TOTAL_LUNS                 2
  69
  70                 /** Blocks in each LUN, calculated from the total capacity divided by the total number of Logical Units in the device. */
  71                 #define LUN_MEDIA_BLOCKS           (VIRTUAL_MEMORY_BLOCKS / TOTAL_LUNS)
  72
  73                 /** Magic signature for a Command Block Wrapper used in the Mass Storage Bulk-Only transport protocol. */
  74                 #define CBW_SIGNATURE              0x43425355UL
  75
  76                 /** Magic signature for a Command Status Wrapper used in the Mass Storage Bulk-Only transport protocol. */
  77                 #define CSW_SIGNATURE              0x53425355UL
  78
  79                 /** Mask for a Command Block Wrapper's flags attribute to specify a command with data sent from host-to-device. */
  80                 #define COMMAND_DIRECTION_DATA_OUT (0 << 7)
  81
  82                 /** Mask for a Command Block Wrapper's flags attribute to specify a command with data sent from device-to-host. */
  83                 #define COMMAND_DIRECTION_DATA_IN  (1 << 7)
  84
  85         /* Type defines: */
  86                 /** Type define for a Command Block Wrapper, used in the Mass Storage Bulk-Only Transport protocol. */
  87                 typedef struct
  88                 {
  89                         uint32_t Signature; /**< Command block signature, must be CBW_SIGNATURE to indicate a valid Command Block */
  90                         uint32_t Tag; /**< Unique command ID value, to associate a command block wrapper with its command status wrapper */
  91                         uint32_t DataTransferLength; /** Length of the optional data portion of the issued command, in bytes */
  92                         uint8_t  Flags; /**< Command block flags, indicating command data direction */
  93                         uint8_t  LUN; /**< Logical Unit number this command is issued to */
  94                         uint8_t  SCSICommandLength; /**< Length of the issued SCSI command within the SCSI command data array */
  95                         uint8_t  SCSICommandData[MAX_SCSI_COMMAND_LENGTH]; /**< Issued SCSI command in the Command Block */
  96                 } CommandBlockWrapper_t;
  97
  98                 /** Type define for a Command Status Wrapper, used in the Mass Storage Bulk-Only Transport protocol. */
  99                 typedef struct
 100                 {
 101                         uint32_t Signature; /**< Status block signature, must be CSW_SIGNATURE to indicate a valid Command Status */
 102                         uint32_t Tag; /**< Unique command ID value, to associate a command block wrapper with its command status wrapper */
 103                         uint32_t DataTransferResidue; /**< Number of bytes of data not processed in the SCSI command */
 104                         uint8_t  Status; /**< Status code of the issued command - a value from the MassStorage_CommandStatusCodes_t enum */
 105                 } CommandStatusWrapper_t;
 106
 107         /* Enums: */
 108                 /** Enum for the possible command status wrapper return status codes. */
 109                 enum MassStorage_CommandStatusCodes_t
 110                 {
 111                         Command_Pass = 0, /**< Command completed with no error */
 112                         Command_Fail = 1, /**< Command failed to complete - host may check the exact error via a SCSI REQUEST SENSE command */
 113                         Phase_Error  = 2  /**< Command failed due to being invalid in the current phase */
 114                 };
 115
 116                 /** Enum for the possible status codes for passing to the UpdateStatus() function. */
 117                 enum MassStorage_StatusCodes_t
 118                 {
 119                         Status_USBNotReady            = 0, /**< USB is not ready (disconnected from a USB host) */
 120                         Status_USBEnumerating         = 1, /**< USB interface is enumerating */
 121                         Status_USBReady               = 2, /**< USB interface is connected and ready */
 122                         Status_CommandBlockError      = 3, /**< Processing a SCSI command block from the host */
 123                         Status_ProcessingCommandBlock = 4, /**< Error during the processing of a SCSI command block from the host */
 124                 };
 125
 126         /* Global Variables: */
 127                 extern CommandBlockWrapper_t  CommandBlock;
 128                 extern CommandStatusWrapper_t CommandStatus;
 129                 extern volatile bool          IsMassStoreReset;
 130
 131         /* Task Definitions: */
 132                 TASK(USB_MassStorage);
 133
 134         /* Function Prototypes: */
 135                 void EVENT_USB_Connect(void);
 136                 void EVENT_USB_Disconnect(void);
 137                 void EVENT_USB_ConfigurationChanged(void);
 138                 void EVENT_USB_UnhandledControlPacket(void);
 139
 140                 void UpdateStatus(uint8_t CurrentStatus);
 141
 142                 #if defined(INCLUDE_FROM_MASSSTORAGE_C)
 143                         static bool ReadInCommandBlock(void);
 144                         static void ReturnCommandStatus(void);
 145                 #endif
 146
 147                 uint8_t StreamCallback_AbortOnMassStoreReset(void);
 148
 149 #endif