Demos/Device/LowLevel/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 /* Global Variables */
  41 /** Structure to hold the latest Command Block Wrapper issued by the host, containing a SCSI command to execute. */
  42 CommandBlockWrapper_t  CommandBlock;
  43
  44 /** Structure to hold the latest Command Status Wrapper to return to the host, containing the status of the last issued command. */
  45 CommandStatusWrapper_t CommandStatus = { .Signature = CSW_SIGNATURE };
  46
  47 /** Flag to asynchronously abort any in-progress data transfers upon the reception of a mass storage reset command. */
  48 volatile bool          IsMassStoreReset = false;
  49
  50 /** Main program entry point. This routine configures the hardware required by the application, then
  51  *  starts the scheduler to run the application tasks.
  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 */
 193                         SCSI_DecodeSCSICommand();
 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                         /* Check if a Mass Storage Reset occurred */
 209                         if (IsMassStoreReset)
 210                         {
 211                                 /* Reset the data endpoint banks */
 212                                 Endpoint_ResetFIFO(MASS_STORAGE_OUT_EPNUM);
 213                                 Endpoint_ResetFIFO(MASS_STORAGE_IN_EPNUM);
 214
 215                                 Endpoint_SelectEndpoint(MASS_STORAGE_OUT_EPNUM);
 216                                 Endpoint_ClearStall();
 217                                 Endpoint_SelectEndpoint(MASS_STORAGE_IN_EPNUM);
 218                                 Endpoint_ClearStall();
 219                         }
 220
 221                         /* Indicate ready */
 222                         LEDs_SetAllLEDs(LEDMASK_USB_READY);
 223                 }
 224                 else
 225                 {
 226                         /* Indicate error reading in the command block from the host */
 227                         LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
 228                 }
 229         }
 230
 231         /* Clear the abort transfer flag */
 232         IsMassStoreReset = false;
 233 }
 234
 235 /** Function to read in a command block from the host, via the bulk data OUT endpoint. This function reads in the next command block
 236  *  if one has been issued, and performs validation to ensure that the block command is valid.
 237  *
 238  *  \return Boolean true if a valid command block has been read in from the endpoint, false otherwise
 239  */
 240 static bool ReadInCommandBlock(void)
 241 {
 242         /* Select the Data Out endpoint */
 243         Endpoint_SelectEndpoint(MASS_STORAGE_OUT_EPNUM);
 244
 245         /* Read in command block header */
 246         Endpoint_Read_Stream_LE(&CommandBlock, (sizeof(CommandBlock) - sizeof(CommandBlock.SCSICommandData)),
 247                                 StreamCallback_AbortOnMassStoreReset);
 248
 249         /* Check if the current command is being aborted by the host */
 250         if (IsMassStoreReset)
 251           return false;
 252
 253         /* Verify the command block - abort if invalid */
 254         if ((CommandBlock.Signature         != CBW_SIGNATURE) ||
 255             (CommandBlock.LUN               >= TOTAL_LUNS)    ||
 256                 (CommandBlock.Flags              & 0x1F)          ||
 257                 (CommandBlock.SCSICommandLength == 0)             ||
 258                 (CommandBlock.SCSICommandLength >  MAX_SCSI_COMMAND_LENGTH))
 259         {
 260                 /* Stall both data pipes until reset by host */
 261                 Endpoint_StallTransaction();
 262                 Endpoint_SelectEndpoint(MASS_STORAGE_IN_EPNUM);
 263                 Endpoint_StallTransaction();
 264
 265                 return false;
 266         }
 267
 268         /* Read in command block command data */
 269         Endpoint_Read_Stream_LE(&CommandBlock.SCSICommandData,
 270                                 CommandBlock.SCSICommandLength,
 271                                 StreamCallback_AbortOnMassStoreReset);
 272
 273         /* Check if the current command is being aborted by the host */
 274         if (IsMassStoreReset)
 275           return false;
 276
 277         /* Finalize the stream transfer to send the last packet */
 278         Endpoint_ClearOUT();
 279
 280         return true;
 281 }
 282
 283 /** Returns the filled Command Status Wrapper back to the host via the bulk data IN endpoint, waiting for the host to clear any
 284  *  stalled data endpoints as needed.
 285  */
 286 static void ReturnCommandStatus(void)
 287 {
 288         /* Select the Data Out endpoint */
 289         Endpoint_SelectEndpoint(MASS_STORAGE_OUT_EPNUM);
 290
 291         /* While data pipe is stalled, wait until the host issues a control request to clear the stall */
 292         while (Endpoint_IsStalled())
 293         {
 294                 /* Check if the current command is being aborted by the host */
 295                 if (IsMassStoreReset)
 296                   return;
 297         }
 298
 299         /* Select the Data In endpoint */
 300         Endpoint_SelectEndpoint(MASS_STORAGE_IN_EPNUM);
 301
 302         /* While data pipe is stalled, wait until the host issues a control request to clear the stall */
 303         while (Endpoint_IsStalled())
 304         {
 305                 /* Check if the current command is being aborted by the host */
 306                 if (IsMassStoreReset)
 307                   return;
 308         }
 309
 310         /* Write the CSW to the endpoint */
 311         Endpoint_Write_Stream_LE(&CommandStatus, sizeof(CommandStatus),
 312                                   StreamCallback_AbortOnMassStoreReset);
 313
 314         /* Check if the current command is being aborted by the host */
 315         if (IsMassStoreReset)
 316           return;
 317
 318         /* Finalize the stream transfer to send the last packet */
 319         Endpoint_ClearIN();
 320 }
 321
 322 /** Stream callback function for the Endpoint stream read and write functions. This callback will abort the current stream transfer
 323  *  if a Mass Storage Reset request has been issued to the control endpoint.
 324  */
 325 uint8_t StreamCallback_AbortOnMassStoreReset(void)
 326 {
 327         /* Abort if a Mass Storage reset command was received */
 328         if (IsMassStoreReset)
 329           return STREAMCALLBACK_Abort;
 330
 331         /* Continue with the current stream operation */
 332         return STREAMCALLBACK_Continue;
 333 }