Demos/Device/LowLevel/MassStorage/MassStorage.c

   1 /*
   2              LUFA Library
   3      Copyright (C) Dean Camera, 2011.
   4
   5   dean [at] fourwalledcubicle [dot] com
   6            www.lufa-lib.org
   7 */
   8
   9 /*
  10   Copyright 2011  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 MS_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 MS_CommandStatusWrapper_t CommandStatus = { .Signature = MS_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         sei();
  59
  60         for (;;)
  61         {
  62                 MassStorage_Task();
  63                 USB_USBTask();
  64         }
  65 }
  66
  67 /** Configures the board hardware and chip peripherals for the demo's functionality. */
  68 void SetupHardware(void)
  69 {
  70         /* Disable watchdog if enabled by bootloader/fuses */
  71         MCUSR &= ~(1 << WDRF);
  72         wdt_disable();
  73
  74         /* Disable clock division */
  75         clock_prescale_set(clock_div_1);
  76
  77         /* Hardware Initialization */
  78         LEDs_Init();
  79         SPI_Init(SPI_SPEED_FCPU_DIV_2 | SPI_ORDER_MSB_FIRST | SPI_SCK_LEAD_FALLING | SPI_SAMPLE_TRAILING | SPI_MODE_MASTER);
  80         Dataflash_Init();
  81         USB_Init();
  82
  83         /* Clear Dataflash sector protections, if enabled */
  84         DataflashManager_ResetDataflashProtections();
  85 }
  86
  87 /** Event handler for the USB_Connect event. This indicates that the device is enumerating via the status LEDs. */
  88 void EVENT_USB_Device_Connect(void)
  89 {
  90         /* Indicate USB enumerating */
  91         LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);
  92
  93         /* Reset the MSReset flag upon connection */
  94         IsMassStoreReset = false;
  95 }
  96
  97 /** Event handler for the USB_Disconnect event. This indicates that the device is no longer connected to a host via
  98  *  the status LEDs and stops the Mass Storage management task.
  99  */
 100 void EVENT_USB_Device_Disconnect(void)
 101 {
 102         /* Indicate USB not ready */
 103         LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
 104 }
 105
 106 /** Event handler for the USB_ConfigurationChanged event. This is fired when the host set the current configuration
 107  *  of the USB device after enumeration - the device endpoints are configured and the Mass Storage management task started.
 108  */
 109 void EVENT_USB_Device_ConfigurationChanged(void)
 110 {
 111         bool ConfigSuccess = true;
 112
 113         /* Setup Mass Storage Data Endpoints */
 114         ConfigSuccess &= Endpoint_ConfigureEndpoint(MASS_STORAGE_IN_EPNUM,  EP_TYPE_BULK, ENDPOINT_DIR_IN,
 115                                                     MASS_STORAGE_IO_EPSIZE, ENDPOINT_BANK_SINGLE);
 116         ConfigSuccess &= Endpoint_ConfigureEndpoint(MASS_STORAGE_OUT_EPNUM, EP_TYPE_BULK, ENDPOINT_DIR_OUT,
 117                                                     MASS_STORAGE_IO_EPSIZE, ENDPOINT_BANK_SINGLE);
 118
 119         /* Indicate endpoint configuration success or failure */
 120         LEDs_SetAllLEDs(ConfigSuccess ? LEDMASK_USB_READY : LEDMASK_USB_ERROR);
 121 }
 122
 123 /** Event handler for the USB_ControlRequest event. This is used to catch and process control requests sent to
 124  *  the device from the USB host before passing along unhandled control requests to the library for processing
 125  *  internally.
 126  */
 127 void EVENT_USB_Device_ControlRequest(void)
 128 {
 129         /* Process UFI specific control requests */
 130         switch (USB_ControlRequest.bRequest)
 131         {
 132                 case MS_REQ_MassStorageReset:
 133                         if (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE))
 134                         {
 135                                 Endpoint_ClearSETUP();
 136                                 Endpoint_ClearStatusStage();
 137
 138                                 /* Indicate that the current transfer should be aborted */
 139                                 IsMassStoreReset = true;
 140                         }
 141
 142                         break;
 143                 case MS_REQ_GetMaxLUN:
 144                         if (USB_ControlRequest.bmRequestType == (REQDIR_DEVICETOHOST | REQTYPE_CLASS | REQREC_INTERFACE))
 145                         {
 146                                 Endpoint_ClearSETUP();
 147
 148                                 /* Indicate to the host the number of supported LUNs (virtual disks) on the device */
 149                                 Endpoint_Write_Byte(TOTAL_LUNS - 1);
 150
 151                                 Endpoint_ClearIN();
 152                                 Endpoint_ClearStatusStage();
 153                         }
 154
 155                         break;
 156         }
 157 }
 158
 159 /** Task to manage the Mass Storage interface, reading in Command Block Wrappers from the host, processing the SCSI commands they
 160  *  contain, and returning Command Status Wrappers back to the host to indicate the success or failure of the last issued command.
 161  */
 162 void MassStorage_Task(void)
 163 {
 164         /* Device must be connected and configured for the task to run */
 165         if (USB_DeviceState != DEVICE_STATE_Configured)
 166           return;
 167
 168         /* Process sent command block from the host if one has been sent */
 169         if (ReadInCommandBlock())
 170         {
 171                 /* Indicate busy */
 172                 LEDs_SetAllLEDs(LEDMASK_USB_BUSY);
 173
 174                 /* Check direction of command, select Data IN endpoint if data is from the device */
 175                 if (CommandBlock.Flags & MS_COMMAND_DIR_DATA_IN)
 176                   Endpoint_SelectEndpoint(MASS_STORAGE_IN_EPNUM);
 177
 178                 /* Decode the received SCSI command, set returned status code */
 179                 CommandStatus.Status = SCSI_DecodeSCSICommand() ? MS_SCSI_COMMAND_Pass : MS_SCSI_COMMAND_Fail;
 180
 181                 /* Load in the CBW tag into the CSW to link them together */
 182                 CommandStatus.Tag = CommandBlock.Tag;
 183
 184                 /* Load in the data residue counter into the CSW */
 185                 CommandStatus.DataTransferResidue = CommandBlock.DataTransferLength;
 186
 187                 /* Stall the selected data pipe if command failed (if data is still to be transferred) */
 188                 if ((CommandStatus.Status == MS_SCSI_COMMAND_Fail) && (CommandStatus.DataTransferResidue))
 189                   Endpoint_StallTransaction();
 190
 191                 /* Return command status block to the host */
 192                 ReturnCommandStatus();
 193
 194                 /* Indicate ready */
 195                 LEDs_SetAllLEDs(LEDMASK_USB_READY);
 196         }
 197
 198         /* Check if a Mass Storage Reset occurred */
 199         if (IsMassStoreReset)
 200         {
 201                 /* Reset the data endpoint banks */
 202                 Endpoint_ResetFIFO(MASS_STORAGE_OUT_EPNUM);
 203                 Endpoint_ResetFIFO(MASS_STORAGE_IN_EPNUM);
 204
 205                 Endpoint_SelectEndpoint(MASS_STORAGE_OUT_EPNUM);
 206                 Endpoint_ClearStall();
 207                 Endpoint_ResetDataToggle();
 208                 Endpoint_SelectEndpoint(MASS_STORAGE_IN_EPNUM);
 209                 Endpoint_ClearStall();
 210                 Endpoint_ResetDataToggle();
 211
 212                 /* Clear the abort transfer flag */
 213                 IsMassStoreReset = false;
 214         }
 215 }
 216
 217 /** Function to read in a command block from the host, via the bulk data OUT endpoint. This function reads in the next command block
 218  *  if one has been issued, and performs validation to ensure that the block command is valid.
 219  *
 220  *  \return Boolean true if a valid command block has been read in from the endpoint, false otherwise
 221  */
 222 static bool ReadInCommandBlock(void)
 223 {
 224         uint16_t BytesTransferred;
 225
 226         /* Select the Data Out endpoint */
 227         Endpoint_SelectEndpoint(MASS_STORAGE_OUT_EPNUM);
 228
 229         /* Abort if no command has been sent from the host */
 230         if (!(Endpoint_IsOUTReceived()))
 231           return false;
 232
 233         /* Read in command block header */
 234         BytesTransferred = 0;
 235         while (Endpoint_Read_Stream_LE(&CommandBlock, (sizeof(CommandBlock) - sizeof(CommandBlock.SCSICommandData)),
 236                                        &BytesTransferred) == ENDPOINT_RWSTREAM_IncompleteTransfer)
 237         {
 238                 /* Check if the current command is being aborted by the host */
 239                 if (IsMassStoreReset)
 240                   return false;
 241         }
 242
 243         /* Verify the command block - abort if invalid */
 244         if ((CommandBlock.Signature         != MS_CBW_SIGNATURE) ||
 245             (CommandBlock.LUN               >= TOTAL_LUNS)       ||
 246                 (CommandBlock.Flags              & 0x1F)             ||
 247                 (CommandBlock.SCSICommandLength == 0)                ||
 248                 (CommandBlock.SCSICommandLength >  sizeof(CommandBlock.SCSICommandData)))
 249         {
 250                 /* Stall both data pipes until reset by host */
 251                 Endpoint_StallTransaction();
 252                 Endpoint_SelectEndpoint(MASS_STORAGE_IN_EPNUM);
 253                 Endpoint_StallTransaction();
 254
 255                 return false;
 256         }
 257
 258         /* Read in command block command data */
 259         BytesTransferred = 0;
 260         while (Endpoint_Read_Stream_LE(&CommandBlock.SCSICommandData, CommandBlock.SCSICommandLength,
 261                                        &BytesTransferred) == ENDPOINT_RWSTREAM_IncompleteTransfer)
 262         {
 263                 /* Check if the current command is being aborted by the host */
 264                 if (IsMassStoreReset)
 265                   return false;
 266         }
 267
 268         /* Finalize the stream transfer to send the last packet */
 269         Endpoint_ClearOUT();
 270
 271         return true;
 272 }
 273
 274 /** Returns the filled Command Status Wrapper back to the host via the bulk data IN endpoint, waiting for the host to clear any
 275  *  stalled data endpoints as needed.
 276  */
 277 static void ReturnCommandStatus(void)
 278 {
 279         uint16_t BytesTransferred;
 280
 281         /* Select the Data Out endpoint */
 282         Endpoint_SelectEndpoint(MASS_STORAGE_OUT_EPNUM);
 283
 284         /* While data pipe is stalled, wait until the host issues a control request to clear the stall */
 285         while (Endpoint_IsStalled())
 286         {
 287                 /* Check if the current command is being aborted by the host */
 288                 if (IsMassStoreReset)
 289                   return;
 290         }
 291
 292         /* Select the Data In endpoint */
 293         Endpoint_SelectEndpoint(MASS_STORAGE_IN_EPNUM);
 294
 295         /* While data pipe is stalled, wait until the host issues a control request to clear the stall */
 296         while (Endpoint_IsStalled())
 297         {
 298                 /* Check if the current command is being aborted by the host */
 299                 if (IsMassStoreReset)
 300                   return;
 301         }
 302
 303         /* Write the CSW to the endpoint */
 304         BytesTransferred = 0;
 305         while (Endpoint_Write_Stream_LE(&CommandStatus, sizeof(CommandStatus),
 306                                         &BytesTransferred) == ENDPOINT_RWSTREAM_IncompleteTransfer)
 307         {
 308                 /* Check if the current command is being aborted by the host */
 309                 if (IsMassStoreReset)
 310                   return;
 311         }
 312
 313         /* Finalize the stream transfer to send the last packet */
 314         Endpoint_ClearIN();
 315 }