Demos/Device/LowLevel/MassStorage/MassStorage.c

   1 /*
   2              LUFA Library
   3      Copyright (C) Dean Camera, 2013.
   4
   5   dean [at] fourwalledcubicle [dot] com
   6            www.lufa-lib.org
   7 */
   8
   9 /*
  10   Copyright 2013  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 disclaims 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         GlobalInterruptEnable();
  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 #if (ARCH == ARCH_AVR8)
  71         /* Disable watchdog if enabled by bootloader/fuses */
  72         MCUSR &= ~(1 << WDRF);
  73         wdt_disable();
  74
  75         /* Disable clock division */
  76         clock_prescale_set(clock_div_1);
  77 #elif (ARCH == ARCH_XMEGA)
  78         /* Start the PLL to multiply the 2MHz RC oscillator to 32MHz and switch the CPU core to run from it */
  79         XMEGACLK_StartPLL(CLOCK_SRC_INT_RC2MHZ, 2000000, F_CPU);
  80         XMEGACLK_SetCPUClockSource(CLOCK_SRC_PLL);
  81
  82         /* Start the 32MHz internal RC oscillator and start the DFLL to increase it to 48MHz using the USB SOF as a reference */
  83         XMEGACLK_StartInternalOscillator(CLOCK_SRC_INT_RC32MHZ);
  84         XMEGACLK_StartDFLL(CLOCK_SRC_INT_RC32MHZ, DFLL_REF_INT_USBSOF, F_USB);
  85
  86         PMIC.CTRL = PMIC_LOLVLEN_bm | PMIC_MEDLVLEN_bm | PMIC_HILVLEN_bm;
  87 #endif
  88
  89         /* Hardware Initialization */
  90         LEDs_Init();
  91         Dataflash_Init();
  92         USB_Init();
  93
  94         /* Check if the Dataflash is working, abort if not */
  95         if (!(DataflashManager_CheckDataflashOperation()))
  96         {
  97                 LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
  98                 for(;;);
  99         }
 100
 101         /* Clear Dataflash sector protections, if enabled */
 102         DataflashManager_ResetDataflashProtections();
 103 }
 104
 105 /** Event handler for the USB_Connect event. This indicates that the device is enumerating via the status LEDs. */
 106 void EVENT_USB_Device_Connect(void)
 107 {
 108         /* Indicate USB enumerating */
 109         LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);
 110
 111         /* Reset the MSReset flag upon connection */
 112         IsMassStoreReset = false;
 113 }
 114
 115 /** Event handler for the USB_Disconnect event. This indicates that the device is no longer connected to a host via
 116  *  the status LEDs and stops the Mass Storage management task.
 117  */
 118 void EVENT_USB_Device_Disconnect(void)
 119 {
 120         /* Indicate USB not ready */
 121         LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
 122 }
 123
 124 /** Event handler for the USB_ConfigurationChanged event. This is fired when the host set the current configuration
 125  *  of the USB device after enumeration - the device endpoints are configured and the Mass Storage management task started.
 126  */
 127 void EVENT_USB_Device_ConfigurationChanged(void)
 128 {
 129         bool ConfigSuccess = true;
 130
 131         /* Setup Mass Storage Data Endpoints */
 132         ConfigSuccess &= Endpoint_ConfigureEndpoint(MASS_STORAGE_IN_EPADDR,  EP_TYPE_BULK, MASS_STORAGE_IO_EPSIZE, 1);
 133         ConfigSuccess &= Endpoint_ConfigureEndpoint(MASS_STORAGE_OUT_EPADDR, EP_TYPE_BULK, MASS_STORAGE_IO_EPSIZE, 1);
 134
 135         /* Indicate endpoint configuration success or failure */
 136         LEDs_SetAllLEDs(ConfigSuccess ? LEDMASK_USB_READY : LEDMASK_USB_ERROR);
 137 }
 138
 139 /** Event handler for the USB_ControlRequest event. This is used to catch and process control requests sent to
 140  *  the device from the USB host before passing along unhandled control requests to the library for processing
 141  *  internally.
 142  */
 143 void EVENT_USB_Device_ControlRequest(void)
 144 {
 145         /* Process UFI specific control requests */
 146         switch (USB_ControlRequest.bRequest)
 147         {
 148                 case MS_REQ_MassStorageReset:
 149                         if (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE))
 150                         {
 151                                 Endpoint_ClearSETUP();
 152                                 Endpoint_ClearStatusStage();
 153
 154                                 /* Indicate that the current transfer should be aborted */
 155                                 IsMassStoreReset = true;
 156                         }
 157
 158                         break;
 159                 case MS_REQ_GetMaxLUN:
 160                         if (USB_ControlRequest.bmRequestType == (REQDIR_DEVICETOHOST | REQTYPE_CLASS | REQREC_INTERFACE))
 161                         {
 162                                 Endpoint_ClearSETUP();
 163
 164                                 /* Indicate to the host the number of supported LUNs (virtual disks) on the device */
 165                                 Endpoint_Write_8(TOTAL_LUNS - 1);
 166
 167                                 Endpoint_ClearIN();
 168                                 Endpoint_ClearStatusStage();
 169                         }
 170
 171                         break;
 172         }
 173 }
 174
 175 /** Task to manage the Mass Storage interface, reading in Command Block Wrappers from the host, processing the SCSI commands they
 176  *  contain, and returning Command Status Wrappers back to the host to indicate the success or failure of the last issued command.
 177  */
 178 void MassStorage_Task(void)
 179 {
 180         /* Device must be connected and configured for the task to run */
 181         if (USB_DeviceState != DEVICE_STATE_Configured)
 182           return;
 183
 184         /* Process sent command block from the host if one has been sent */
 185         if (ReadInCommandBlock())
 186         {
 187                 /* Indicate busy */
 188                 LEDs_SetAllLEDs(LEDMASK_USB_BUSY);
 189
 190                 /* Check direction of command, select Data IN endpoint if data is from the device */
 191                 if (CommandBlock.Flags & MS_COMMAND_DIR_DATA_IN)
 192                   Endpoint_SelectEndpoint(MASS_STORAGE_IN_EPADDR);
 193
 194                 /* Decode the received SCSI command, set returned status code */
 195                 CommandStatus.Status = SCSI_DecodeSCSICommand() ? MS_SCSI_COMMAND_Pass : MS_SCSI_COMMAND_Fail;
 196
 197                 /* Load in the CBW tag into the CSW to link them together */
 198                 CommandStatus.Tag = CommandBlock.Tag;
 199
 200                 /* Load in the data residue counter into the CSW */
 201                 CommandStatus.DataTransferResidue = CommandBlock.DataTransferLength;
 202
 203                 /* Stall the selected data pipe if command failed (if data is still to be transferred) */
 204                 if ((CommandStatus.Status == MS_SCSI_COMMAND_Fail) && (CommandStatus.DataTransferResidue))
 205                   Endpoint_StallTransaction();
 206
 207                 /* Return command status block to the host */
 208                 ReturnCommandStatus();
 209
 210                 /* Indicate ready */
 211                 LEDs_SetAllLEDs(LEDMASK_USB_READY);
 212         }
 213
 214         /* Check if a Mass Storage Reset occurred */
 215         if (IsMassStoreReset)
 216         {
 217                 /* Reset the data endpoint banks */
 218                 Endpoint_ResetEndpoint(MASS_STORAGE_OUT_EPADDR);
 219                 Endpoint_ResetEndpoint(MASS_STORAGE_IN_EPADDR);
 220
 221                 Endpoint_SelectEndpoint(MASS_STORAGE_OUT_EPADDR);
 222                 Endpoint_ClearStall();
 223                 Endpoint_ResetDataToggle();
 224                 Endpoint_SelectEndpoint(MASS_STORAGE_IN_EPADDR);
 225                 Endpoint_ClearStall();
 226                 Endpoint_ResetDataToggle();
 227
 228                 /* Clear the abort transfer flag */
 229                 IsMassStoreReset = false;
 230         }
 231 }
 232
 233 /** Function to read in a command block from the host, via the bulk data OUT endpoint. This function reads in the next command block
 234  *  if one has been issued, and performs validation to ensure that the block command is valid.
 235  *
 236  *  \return Boolean \c true if a valid command block has been read in from the endpoint, \c false otherwise
 237  */
 238 static bool ReadInCommandBlock(void)
 239 {
 240         uint16_t BytesTransferred;
 241
 242         /* Select the Data Out endpoint */
 243         Endpoint_SelectEndpoint(MASS_STORAGE_OUT_EPADDR);
 244
 245         /* Abort if no command has been sent from the host */
 246         if (!(Endpoint_IsOUTReceived()))
 247           return false;
 248
 249         /* Read in command block header */
 250         BytesTransferred = 0;
 251         while (Endpoint_Read_Stream_LE(&CommandBlock, (sizeof(CommandBlock) - sizeof(CommandBlock.SCSICommandData)),
 252                                        &BytesTransferred) == ENDPOINT_RWSTREAM_IncompleteTransfer)
 253         {
 254                 /* Check if the current command is being aborted by the host */
 255                 if (IsMassStoreReset)
 256                   return false;
 257         }
 258
 259         /* Verify the command block - abort if invalid */
 260         if ((CommandBlock.Signature         != MS_CBW_SIGNATURE) ||
 261             (CommandBlock.LUN               >= TOTAL_LUNS)       ||
 262                 (CommandBlock.Flags              & 0x1F)             ||
 263                 (CommandBlock.SCSICommandLength == 0)                ||
 264                 (CommandBlock.SCSICommandLength >  sizeof(CommandBlock.SCSICommandData)))
 265         {
 266                 /* Stall both data pipes until reset by host */
 267                 Endpoint_StallTransaction();
 268                 Endpoint_SelectEndpoint(MASS_STORAGE_IN_EPADDR);
 269                 Endpoint_StallTransaction();
 270
 271                 return false;
 272         }
 273
 274         /* Read in command block command data */
 275         BytesTransferred = 0;
 276         while (Endpoint_Read_Stream_LE(&CommandBlock.SCSICommandData, CommandBlock.SCSICommandLength,
 277                                        &BytesTransferred) == ENDPOINT_RWSTREAM_IncompleteTransfer)
 278         {
 279                 /* Check if the current command is being aborted by the host */
 280                 if (IsMassStoreReset)
 281                   return false;
 282         }
 283
 284         /* Finalize the stream transfer to send the last packet */
 285         Endpoint_ClearOUT();
 286
 287         return true;
 288 }
 289
 290 /** Returns the filled Command Status Wrapper back to the host via the bulk data IN endpoint, waiting for the host to clear any
 291  *  stalled data endpoints as needed.
 292  */
 293 static void ReturnCommandStatus(void)
 294 {
 295         uint16_t BytesTransferred;
 296
 297         /* Select the Data Out endpoint */
 298         Endpoint_SelectEndpoint(MASS_STORAGE_OUT_EPADDR);
 299
 300         /* While data pipe is stalled, wait until the host issues a control request to clear the stall */
 301         while (Endpoint_IsStalled())
 302         {
 303                 /* Check if the current command is being aborted by the host */
 304                 if (IsMassStoreReset)
 305                   return;
 306         }
 307
 308         /* Select the Data In endpoint */
 309         Endpoint_SelectEndpoint(MASS_STORAGE_IN_EPADDR);
 310
 311         /* While data pipe is stalled, wait until the host issues a control request to clear the stall */
 312         while (Endpoint_IsStalled())
 313         {
 314                 /* Check if the current command is being aborted by the host */
 315                 if (IsMassStoreReset)
 316                   return;
 317         }
 318
 319         /* Write the CSW to the endpoint */
 320         BytesTransferred = 0;
 321         while (Endpoint_Write_Stream_LE(&CommandStatus, sizeof(CommandStatus),
 322                                         &BytesTransferred) == ENDPOINT_RWSTREAM_IncompleteTransfer)
 323         {
 324                 /* Check if the current command is being aborted by the host */
 325                 if (IsMassStoreReset)
 326                   return;
 327         }
 328
 329         /* Finalize the stream transfer to send the last packet */
 330         Endpoint_ClearIN();
 331 }
 332