Demos/Device/MassStorage/MassStorage.c

   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  *  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 /* Scheduler Task List */
  41 TASK_LIST
  42 {
  43         { .Task = USB_MassStorage      , .TaskStatus = TASK_STOP },
  44 };
  45
  46 /* Global Variables */
  47 /** Structure to hold the latest Command Block Wrapper issued by the host, containing a SCSI command to execute. */
  48 CommandBlockWrapper_t  CommandBlock;
  49
  50 /** Structure to hold the latest Command Status Wrapper to return to the host, containing the status of the last issued command. */
  51 CommandStatusWrapper_t CommandStatus = { .Signature = CSW_SIGNATURE };
  52
  53 /** Flag to asynchronously abort any in-progress data transfers upon the reception of a mass storage reset command. */
  54 volatile bool          IsMassStoreReset = false;
  55
  56 /** Main program entry point. This routine configures the hardware required by the application, then
  57  *  starts the scheduler to run the application tasks.
  58  */
  59 int main(void)
  60 {
  61         /* Disable watchdog if enabled by bootloader/fuses */
  62         MCUSR &= ~(1 << WDRF);
  63         wdt_disable();
  64
  65         /* Disable clock division */
  66         clock_prescale_set(clock_div_1);
  67
  68         /* Hardware Initialization */
  69         LEDs_Init();
  70         Dataflash_Init(SPI_SPEED_FCPU_DIV_2);
  71
  72         /* Clear Dataflash sector protections, if enabled */
  73         DataflashManager_ResetDataflashProtections();
  74
  75         /* Indicate USB not ready */
  76         UpdateStatus(Status_USBNotReady);
  77
  78         /* Initialize Scheduler so that it can be used */
  79         Scheduler_Init();
  80
  81         /* Initialize USB Subsystem */
  82         USB_Init();
  83
  84         /* Scheduling - routine never returns, so put this last in the main function */
  85         Scheduler_Start();
  86 }
  87
  88 /** Event handler for the USB_Connect event. This indicates that the device is enumerating via the status LEDs. */
  89 EVENT_HANDLER(USB_Connect)
  90 {
  91         /* Indicate USB enumerating */
  92         UpdateStatus(Status_USBEnumerating);
  93
  94         /* Reset the MSReset flag upon connection */
  95         IsMassStoreReset = false;
  96 }
  97
  98 /** Event handler for the USB_Disconnect event. This indicates that the device is no longer connected to a host via
  99  *  the status LEDs and stops the Mass Storage management task.
 100  */
 101 EVENT_HANDLER(USB_Disconnect)
 102 {
 103         /* Stop running mass storage task */
 104         Scheduler_SetTaskMode(USB_MassStorage, TASK_STOP);
 105
 106         /* Indicate USB not ready */
 107         UpdateStatus(Status_USBNotReady);
 108 }
 109
 110 /** Event handler for the USB_ConfigurationChanged event. This is fired when the host set the current configuration
 111  *  of the USB device after enumeration - the device endpoints are configured and the Mass Storage management task started.
 112  */
 113 EVENT_HANDLER(USB_ConfigurationChanged)
 114 {
 115         /* Setup Mass Storage In and Out Endpoints */
 116         Endpoint_ConfigureEndpoint(MASS_STORAGE_IN_EPNUM, EP_TYPE_BULK,
 117                                        ENDPOINT_DIR_IN, MASS_STORAGE_IO_EPSIZE,
 118                                    ENDPOINT_BANK_DOUBLE);
 119
 120         Endpoint_ConfigureEndpoint(MASS_STORAGE_OUT_EPNUM, EP_TYPE_BULK,
 121                                        ENDPOINT_DIR_OUT, MASS_STORAGE_IO_EPSIZE,
 122                                    ENDPOINT_BANK_DOUBLE);
 123
 124         /* Indicate USB connected and ready */
 125         UpdateStatus(Status_USBReady);
 126
 127         /* Start mass storage task */
 128         Scheduler_SetTaskMode(USB_MassStorage, TASK_RUN);
 129 }
 130
 131 /** Event handler for the USB_UnhandledControlPacket event. This is used to catch standard and class specific
 132  *  control requests that are not handled internally by the USB library (including the Mass Storage class-specific
 133  *  requests) so that they can be handled appropriately for the application.
 134  */
 135 EVENT_HANDLER(USB_UnhandledControlPacket)
 136 {
 137         /* Process UFI specific control requests */
 138         switch (USB_ControlRequest.bRequest)
 139         {
 140                 case REQ_MassStorageReset:
 141                         if (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE))
 142                         {
 143                                 Endpoint_ClearSETUP();
 144
 145                                 /* Indicate that the current transfer should be aborted */
 146                                 IsMassStoreReset = true;
 147
 148                                 /* Acknowledge status stage */
 149                                 while (!(Endpoint_IsINReady()));
 150                                 Endpoint_ClearIN();
 151                         }
 152
 153                         break;
 154                 case REQ_GetMaxLUN:
 155                         if (USB_ControlRequest.bmRequestType == (REQDIR_DEVICETOHOST | REQTYPE_CLASS | REQREC_INTERFACE))
 156                         {
 157                                 Endpoint_ClearSETUP();
 158
 159                                 /* Indicate to the host the number of supported LUNs (virtual disks) on the device */
 160                                 Endpoint_Write_Byte(TOTAL_LUNS - 1);
 161
 162                                 Endpoint_ClearIN();
 163
 164                                 /* Acknowledge status stage */
 165                                 while (!(Endpoint_IsOUTReceived()));
 166                                 Endpoint_ClearOUT();
 167                         }
 168
 169                         break;
 170         }
 171 }
 172
 173 /** Function to manage status updates to the user. This is done via LEDs on the given board, if available, but may be changed to
 174  *  log to a serial port, or anything else that is suitable for status updates.
 175  *
 176  *  \param CurrentStatus  Current status of the system, from the MassStorage_StatusCodes_t enum
 177  */
 178 void UpdateStatus(uint8_t CurrentStatus)
 179 {
 180         uint8_t LEDMask = LEDS_NO_LEDS;
 181
 182         /* Set the LED mask to the appropriate LED mask based on the given status code */
 183         switch (CurrentStatus)
 184         {
 185                 case Status_USBNotReady:
 186                         LEDMask = (LEDS_LED1);
 187                         break;
 188                 case Status_USBEnumerating:
 189                         LEDMask = (LEDS_LED1 | LEDS_LED2);
 190                         break;
 191                 case Status_USBReady:
 192                         LEDMask = (LEDS_LED2 | LEDS_LED4);
 193                         break;
 194                 case Status_CommandBlockError:
 195                         LEDMask = (LEDS_LED1);
 196                         break;
 197                 case Status_ProcessingCommandBlock:
 198                         LEDMask = (LEDS_LED1 | LEDS_LED2);
 199                         break;
 200         }
 201
 202         /* Set the board LEDs to the new LED mask */
 203         LEDs_SetAllLEDs(LEDMask);
 204 }
 205
 206 /** Task to manage the Mass Storage interface, reading in Command Block Wrappers from the host, processing the SCSI commands they
 207  *  contain, and returning Command Status Wrappers back to the host to indicate the success or failure of the last issued command.
 208  */
 209 TASK(USB_MassStorage)
 210 {
 211         /* Check if the USB System is connected to a Host */
 212         if (USB_IsConnected)
 213         {
 214                 /* Select the Data Out Endpoint */
 215                 Endpoint_SelectEndpoint(MASS_STORAGE_OUT_EPNUM);
 216
 217                 /* Check to see if a command from the host has been issued */
 218                 if (Endpoint_IsReadWriteAllowed())
 219                 {
 220                         /* Indicate busy */
 221                         UpdateStatus(Status_ProcessingCommandBlock);
 222
 223                         /* Process sent command block from the host */
 224                         if (ReadInCommandBlock())
 225                         {
 226                                 /* Check direction of command, select Data IN endpoint if data is from the device */
 227                                 if (CommandBlock.Flags & COMMAND_DIRECTION_DATA_IN)
 228                                   Endpoint_SelectEndpoint(MASS_STORAGE_IN_EPNUM);
 229
 230                                 /* Decode the received SCSI command */
 231                                 SCSI_DecodeSCSICommand();
 232
 233                                 /* Load in the CBW tag into the CSW to link them together */
 234                                 CommandStatus.Tag = CommandBlock.Tag;
 235
 236                                 /* Load in the data residue counter into the CSW */
 237                                 CommandStatus.DataTransferResidue = CommandBlock.DataTransferLength;
 238
 239                                 /* Stall the selected data pipe if command failed (if data is still to be transferred) */
 240                                 if ((CommandStatus.Status == Command_Fail) && (CommandStatus.DataTransferResidue))
 241                                   Endpoint_StallTransaction();
 242
 243                                 /* Return command status block to the host */
 244                                 ReturnCommandStatus();
 245
 246                                 /* Check if a Mass Storage Reset occurred */
 247                                 if (IsMassStoreReset)
 248                                 {
 249                                         /* Reset the data endpoint banks */
 250                                         Endpoint_ResetFIFO(MASS_STORAGE_OUT_EPNUM);
 251                                         Endpoint_ResetFIFO(MASS_STORAGE_IN_EPNUM);
 252
 253                                         /* Clear the abort transfer flag */
 254                                         IsMassStoreReset = false;
 255                                 }
 256
 257                                 /* Indicate ready */
 258                                 UpdateStatus(Status_USBReady);
 259                         }
 260                         else
 261                         {
 262                                 /* Indicate error reading in the command block from the host */
 263                                 UpdateStatus(Status_CommandBlockError);
 264                         }
 265                 }
 266         }
 267 }
 268
 269 /** Function to read in a command block from the host, via the bulk data OUT endpoint. This function reads in the next command block
 270  *  if one has been issued, and performs validation to ensure that the block command is valid.
 271  *
 272  *  \return Boolean true if a valid command block has been read in from the endpoint, false otherwise
 273  */
 274 static bool ReadInCommandBlock(void)
 275 {
 276         /* Select the Data Out endpoint */
 277         Endpoint_SelectEndpoint(MASS_STORAGE_OUT_EPNUM);
 278
 279         /* Read in command block header */
 280         Endpoint_Read_Stream_LE(&CommandBlock, (sizeof(CommandBlock) - sizeof(CommandBlock.SCSICommandData)),
 281                                 AbortOnMassStoreReset);
 282
 283         /* Check if the current command is being aborted by the host */
 284         if (IsMassStoreReset)
 285           return false;
 286
 287         /* Verify the command block - abort if invalid */
 288         if ((CommandBlock.Signature != CBW_SIGNATURE) ||
 289             (CommandBlock.LUN >= TOTAL_LUNS) ||
 290                 (CommandBlock.SCSICommandLength > MAX_SCSI_COMMAND_LENGTH))
 291         {
 292                 /* Stall both data pipes until reset by host */
 293                 Endpoint_StallTransaction();
 294                 Endpoint_SelectEndpoint(MASS_STORAGE_IN_EPNUM);
 295                 Endpoint_StallTransaction();
 296
 297                 return false;
 298         }
 299
 300         /* Read in command block command data */
 301         Endpoint_Read_Stream_LE(&CommandBlock.SCSICommandData,
 302                                 CommandBlock.SCSICommandLength,
 303                                 AbortOnMassStoreReset);
 304
 305         /* Check if the current command is being aborted by the host */
 306         if (IsMassStoreReset)
 307           return false;
 308
 309         /* Finalize the stream transfer to send the last packet */
 310         Endpoint_ClearOUT();
 311
 312         return true;
 313 }
 314
 315 /** Returns the filled Command Status Wrapper back to the host via the bulk data IN endpoint, waiting for the host to clear any
 316  *  stalled data endpoints as needed.
 317  */
 318 static void ReturnCommandStatus(void)
 319 {
 320         /* Select the Data Out endpoint */
 321         Endpoint_SelectEndpoint(MASS_STORAGE_OUT_EPNUM);
 322
 323         /* While data pipe is stalled, wait until the host issues a control request to clear the stall */
 324         while (Endpoint_IsStalled())
 325         {
 326                 /* Check if the current command is being aborted by the host */
 327                 if (IsMassStoreReset)
 328                   return;
 329         }
 330
 331         /* Select the Data In endpoint */
 332         Endpoint_SelectEndpoint(MASS_STORAGE_IN_EPNUM);
 333
 334         /* While data pipe is stalled, wait until the host issues a control request to clear the stall */
 335         while (Endpoint_IsStalled())
 336         {
 337                 /* Check if the current command is being aborted by the host */
 338                 if (IsMassStoreReset)
 339                   return;
 340         }
 341
 342         /* Write the CSW to the endpoint */
 343         Endpoint_Write_Stream_LE(&CommandStatus, sizeof(CommandStatus),
 344                                   AbortOnMassStoreReset);
 345
 346         /* Check if the current command is being aborted by the host */
 347         if (IsMassStoreReset)
 348           return;
 349
 350         /* Finalize the stream transfer to send the last packet */
 351         Endpoint_ClearIN();
 352 }
 353
 354 /** Stream callback function for the Endpoint stream read and write functions. This callback will abort the current stream transfer
 355  *  if a Mass Storage Reset request has been issued to the control endpoint.
 356  */
 357 STREAM_CALLBACK(AbortOnMassStoreReset)
 358 {
 359         /* Abort if a Mass Storage reset command was received */
 360         if (IsMassStoreReset)
 361           return STREAMCALLBACK_Abort;
 362
 363         /* Continue with the current stream operation */
 364         return STREAMCALLBACK_Continue;
 365 }