Demos/Device/LowLevel/MassStorage/MassStorage.c

   1 /*
   2              LUFA Library
   3      Copyright (C) Dean Camera, 2010.
   4
   5   dean [at] fourwalledcubicle [dot] com
   6       www.fourwalledcubicle.com
   7 */
   8
   9 /*
  10   Copyright 2010  Dean Camera (dean [at] fourwalledcubicle [dot] com)
  11
  12   Permission to use, copy, modify, distribute, and sell this
  13   software and its documentation for any purpose is hereby granted
  14   without fee, provided that the above copyright notice appear in
  15   all 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  *  Main source file for the Mass Storage demo. This file contains the main tasks of the demo and
  34  *  is responsible for the initial application hardware configuration.
  35  */
  36
  37 #define  INCLUDE_FROM_MASSSTORAGE_C
  38 #include "MassStorage.h"
  39
  40 /** Structure to hold the latest Command Block Wrapper issued by the host, containing a SCSI command to execute. */
  41 CommandBlockWrapper_t  CommandBlock;
  42
  43 /** Structure to hold the latest Command Status Wrapper to return to the host, containing the status of the last issued command. */
  44 CommandStatusWrapper_t CommandStatus = { .Signature = CSW_SIGNATURE };
  45
  46 /** Flag to asynchronously abort any in-progress data transfers upon the reception of a mass storage reset command. */
  47 volatile bool          IsMassStoreReset = false;
  48
  49
  50 /** Main program entry point. This routine configures the hardware required by the application, then
  51  *  enters a loop to run the application tasks in sequence.
  52  */
  53 int main(void)
  54 {
  55         SetupHardware();
  56
  57         LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
  58
  59         for (;;)
  60         {
  61                 MassStorage_Task();
  62                 USB_USBTask();
  63         }
  64 }
  65
  66 /** Configures the board hardware and chip peripherals for the demo's functionality. */
  67 void SetupHardware(void)
  68 {
  69         /* Disable watchdog if enabled by bootloader/fuses */
  70         MCUSR &= ~(1 << WDRF);
  71         wdt_disable();
  72
  73         /* Disable clock division */
  74         clock_prescale_set(clock_div_1);
  75
  76         /* Hardware Initialization */
  77         LEDs_Init();
  78         SPI_Init(SPI_SPEED_FCPU_DIV_2 | SPI_SCK_LEAD_FALLING | SPI_SAMPLE_TRAILING | SPI_MODE_MASTER);
  79         Dataflash_Init();
  80         USB_Init();
  81
  82         /* Clear Dataflash sector protections, if enabled */
  83         DataflashManager_ResetDataflashProtections();
  84 }
  85
  86 /** Event handler for the USB_Connect event. This indicates that the device is enumerating via the status LEDs. */
  87 void EVENT_USB_Device_Connect(void)
  88 {
  89         /* Indicate USB enumerating */
  90         LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);
  91
  92         /* Reset the MSReset flag upon connection */
  93         IsMassStoreReset = false;
  94 }
  95
  96 /** Event handler for the USB_Disconnect event. This indicates that the device is no longer connected to a host via
  97  *  the status LEDs and stops the Mass Storage management task.
  98  */
  99 void EVENT_USB_Device_Disconnect(void)
 100 {
 101         /* Indicate USB not ready */
 102         LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
 103 }
 104
 105 /** Event handler for the USB_ConfigurationChanged event. This is fired when the host set the current configuration
 106  *  of the USB device after enumeration - the device endpoints are configured and the Mass Storage management task started.
 107  */
 108 void EVENT_USB_Device_ConfigurationChanged(void)
 109 {
 110         /* Indicate USB connected and ready */
 111         LEDs_SetAllLEDs(LEDMASK_USB_READY);
 112
 113         /* Setup Mass Storage In and Out Endpoints */
 114         if (!(Endpoint_ConfigureEndpoint(MASS_STORAGE_IN_EPNUM, EP_TYPE_BULK,
 115                                              ENDPOINT_DIR_IN, MASS_STORAGE_IO_EPSIZE,
 116                                          ENDPOINT_BANK_DOUBLE)))
 117         {
 118                 LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
 119         }
 120
 121         if (!(Endpoint_ConfigureEndpoint(MASS_STORAGE_OUT_EPNUM, EP_TYPE_BULK,
 122                                              ENDPOINT_DIR_OUT, MASS_STORAGE_IO_EPSIZE,
 123                                          ENDPOINT_BANK_DOUBLE)))
 124         {
 125                 LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
 126         }
 127 }
 128
 129 /** Event handler for the USB_UnhandledControlPacket event. This is used to catch standard and class specific
 130  *  control requests that are not handled internally by the USB library (including the Mass Storage class-specific
 131  *  requests) so that they can be handled appropriately for the application.
 132  */
 133 void EVENT_USB_Device_UnhandledControlRequest(void)
 134 {
 135         /* Process UFI specific control requests */
 136         switch (USB_ControlRequest.bRequest)
 137         {
 138                 case REQ_MassStorageReset:
 139                         if (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE))
 140                         {
 141                                 Endpoint_ClearSETUP();
 142
 143                                 /* Indicate that the current transfer should be aborted */
 144                                 IsMassStoreReset = true;
 145
 146                                 Endpoint_ClearStatusStage();
 147                         }
 148
 149                         break;
 150                 case REQ_GetMaxLUN:
 151                         if (USB_ControlRequest.bmRequestType == (REQDIR_DEVICETOHOST | REQTYPE_CLASS | REQREC_INTERFACE))
 152                         {
 153                                 Endpoint_ClearSETUP();
 154
 155                                 /* Indicate to the host the number of supported LUNs (virtual disks) on the device */
 156                                 Endpoint_Write_Byte(TOTAL_LUNS - 1);
 157
 158                                 Endpoint_ClearIN();
 159
 160                                 Endpoint_ClearStatusStage();
 161                         }
 162
 163                         break;
 164         }
 165 }
 166
 167 /** Task to manage the Mass Storage interface, reading in Command Block Wrappers from the host, processing the SCSI commands they
 168  *  contain, and returning Command Status Wrappers back to the host to indicate the success or failure of the last issued command.
 169  */
 170 void MassStorage_Task(void)
 171 {
 172         /* Device must be connected and configured for the task to run */
 173         if (USB_DeviceState != DEVICE_STATE_Configured)
 174           return;
 175
 176         /* Select the Data Out Endpoint */
 177         Endpoint_SelectEndpoint(MASS_STORAGE_OUT_EPNUM);
 178
 179         /* Check to see if a command from the host has been issued */
 180         if (Endpoint_IsReadWriteAllowed())
 181         {
 182                 /* Indicate busy */
 183                 LEDs_SetAllLEDs(LEDMASK_USB_BUSY);
 184
 185                 /* Process sent command block from the host */
 186                 if (ReadInCommandBlock())
 187                 {
 188                         /* Check direction of command, select Data IN endpoint if data is from the device */
 189                         if (CommandBlock.Flags & COMMAND_DIRECTION_DATA_IN)
 190                           Endpoint_SelectEndpoint(MASS_STORAGE_IN_EPNUM);
 191
 192                         /* Decode the received SCSI command, set returned status code */
 193                         CommandStatus.Status = SCSI_DecodeSCSICommand() ? Command_Pass : Command_Fail;
 194
 195                         /* Load in the CBW tag into the CSW to link them together */
 196                         CommandStatus.Tag = CommandBlock.Tag;
 197
 198                         /* Load in the data residue counter into the CSW */
 199                         CommandStatus.DataTransferResidue = CommandBlock.DataTransferLength;
 200
 201                         /* Stall the selected data pipe if command failed (if data is still to be transferred) */
 202                         if ((CommandStatus.Status == Command_Fail) && (CommandStatus.DataTransferResidue))
 203                           Endpoint_StallTransaction();
 204
 205                         /* Return command status block to the host */
 206                         ReturnCommandStatus();
 207
 208                         /* Indicate ready */
 209                         LEDs_SetAllLEDs(LEDMASK_USB_READY);
 210                 }
 211                 else
 212                 {
 213                         /* Indicate error reading in the command block from the host */
 214                         LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
 215                 }
 216         }
 217
 218         /* Check if a Mass Storage Reset occurred */
 219         if (IsMassStoreReset)
 220         {
 221                 /* Reset the data endpoint banks */
 222                 Endpoint_ResetFIFO(MASS_STORAGE_OUT_EPNUM);
 223                 Endpoint_ResetFIFO(MASS_STORAGE_IN_EPNUM);
 224
 225                 Endpoint_SelectEndpoint(MASS_STORAGE_OUT_EPNUM);
 226                 Endpoint_ClearStall();
 227                 Endpoint_ResetDataToggle();
 228                 Endpoint_SelectEndpoint(MASS_STORAGE_IN_EPNUM);
 229                 Endpoint_ClearStall();
 230                 Endpoint_ResetDataToggle();
 231
 232                 /* Clear the abort transfer flag */
 233                 IsMassStoreReset = false;
 234         }
 235 }
 236
 237 /** Function to read in a command block from the host, via the bulk data OUT endpoint. This function reads in the next command block
 238  *  if one has been issued, and performs validation to ensure that the block command is valid.
 239  *
 240  *  \return Boolean true if a valid command block has been read in from the endpoint, false otherwise
 241  */
 242 static bool ReadInCommandBlock(void)
 243 {
 244         /* Select the Data Out endpoint */
 245         Endpoint_SelectEndpoint(MASS_STORAGE_OUT_EPNUM);
 246
 247         /* Read in command block header */
 248         Endpoint_Read_Stream_LE(&CommandBlock, (sizeof(CommandBlock) - sizeof(CommandBlock.SCSICommandData)),
 249                                 StreamCallback_AbortOnMassStoreReset);
 250
 251         /* Check if the current command is being aborted by the host */
 252         if (IsMassStoreReset)
 253           return false;
 254
 255         /* Verify the command block - abort if invalid */
 256         if ((CommandBlock.Signature         != CBW_SIGNATURE) ||
 257             (CommandBlock.LUN               >= TOTAL_LUNS)    ||
 258                 (CommandBlock.Flags              & 0x1F)          ||
 259                 (CommandBlock.SCSICommandLength == 0)             ||
 260                 (CommandBlock.SCSICommandLength >  MAX_SCSI_COMMAND_LENGTH))
 261         {
 262                 /* Stall both data pipes until reset by host */
 263                 Endpoint_StallTransaction();
 264                 Endpoint_SelectEndpoint(MASS_STORAGE_IN_EPNUM);
 265                 Endpoint_StallTransaction();
 266
 267                 return false;
 268         }
 269
 270         /* Read in command block command data */
 271         Endpoint_Read_Stream_LE(&CommandBlock.SCSICommandData,
 272                                 CommandBlock.SCSICommandLength,
 273                                 StreamCallback_AbortOnMassStoreReset);
 274
 275         /* Check if the current command is being aborted by the host */
 276         if (IsMassStoreReset)
 277           return false;
 278
 279         /* Finalize the stream transfer to send the last packet */
 280         Endpoint_ClearOUT();
 281
 282         return true;
 283 }
 284
 285 /** Returns the filled Command Status Wrapper back to the host via the bulk data IN endpoint, waiting for the host to clear any
 286  *  stalled data endpoints as needed.
 287  */
 288 static void ReturnCommandStatus(void)
 289 {
 290         /* Select the Data Out endpoint */
 291         Endpoint_SelectEndpoint(MASS_STORAGE_OUT_EPNUM);
 292
 293         /* While data pipe is stalled, wait until the host issues a control request to clear the stall */
 294         while (Endpoint_IsStalled())
 295         {
 296                 /* Check if the current command is being aborted by the host */
 297                 if (IsMassStoreReset)
 298                   return;
 299         }
 300
 301         /* Select the Data In endpoint */
 302         Endpoint_SelectEndpoint(MASS_STORAGE_IN_EPNUM);
 303
 304         /* While data pipe is stalled, wait until the host issues a control request to clear the stall */
 305         while (Endpoint_IsStalled())
 306         {
 307                 /* Check if the current command is being aborted by the host */
 308                 if (IsMassStoreReset)
 309                   return;
 310         }
 311
 312         /* Write the CSW to the endpoint */
 313         Endpoint_Write_Stream_LE(&CommandStatus, sizeof(CommandStatus),
 314                                   StreamCallback_AbortOnMassStoreReset);
 315
 316         /* Check if the current command is being aborted by the host */
 317         if (IsMassStoreReset)
 318           return;
 319
 320         /* Finalize the stream transfer to send the last packet */
 321         Endpoint_ClearIN();
 322 }
 323
 324 /** Stream callback function for the Endpoint stream read and write functions. This callback will abort the current stream transfer
 325  *  if a Mass Storage Reset request has been issued to the control endpoint.
 326  */
 327 uint8_t StreamCallback_AbortOnMassStoreReset(void)
 328 {
 329         /* Abort if a Mass Storage reset command was received */
 330         if (IsMassStoreReset)
 331           return STREAMCALLBACK_Abort;
 332
 333         /* Continue with the current stream operation */
 334         return STREAMCALLBACK_Continue;
 335 }