Bootloaders/Incomplete/MassStorage/Lib/VirtualFAT.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 #include "VirtualFAT.h"
  32
  33 static const FATBootBlock_t BootBlock =
  34         {
  35                 .Bootstrap               = {0xEB, 0x3C, 0x90},
  36                 .Description             = "mkdosfs",
  37                 .SectorSize              = SECTOR_SIZE_BYTES,
  38                 .SectorsPerCluster       = SECTOR_PER_CLUSTER,
  39                 .ReservedSectors         = 1,
  40                 .FATCopies               = 2,
  41                 .RootDirectoryEntries    = (SECTOR_SIZE_BYTES / sizeof(FATDirectoryEntry_t)),
  42                 .TotalSectors16          = LUN_MEDIA_BLOCKS,
  43                 .MediaDescriptor         = 0xF8,
  44                 .SectorsPerFAT           = 1,
  45                 .SectorsPerTrack         = 32,
  46                 .Heads                   = 64,
  47                 .HiddenSectors           = 0,
  48                 .TotalSectors32          = 0,
  49                 .PhysicalDriveNum        = 0,
  50                 .ExtendedBootRecordSig   = 0x29,
  51                 .VolumeSerialNumber      = 0x12345678,
  52                 .VolumeLabel             = "LUFA BOOT  ",
  53                 .FilesystemIdentifier    = "FAT16   ",
  54                 .BootstrapProgram        = {0},
  55                 .MagicSignature          = 0xAA55,
  56         };
  57
  58 static FATDirectoryEntry_t FirmwareFileEntry =
  59         {
  60                 .Filename        = "FIRMWARE",
  61                 .Extension       = "BIN",
  62                 .Attributes      = 0,
  63                 .Reserved        = {0},
  64                 .CreationTime    = FAT_TIME(1, 1, 0),
  65                 .CreationDate    = FAT_DATE(14, 2, 1989),
  66                 .StartingCluster = 2,
  67                 .FileSizeBytes   = 2049,
  68         };
  69
  70
  71 static void WriteBlock(uint16_t BlockNumber)
  72 {
  73         uint8_t BlockBuffer[512];
  74
  75         /* Wait until endpoint is ready before continuing */
  76         if (Endpoint_WaitUntilReady())
  77           return;
  78
  79         Endpoint_Read_Stream_LE(BlockBuffer, sizeof(BlockBuffer), NULL);
  80         Endpoint_ClearOUT();
  81
  82         printf("WRITE %d\r\n", BlockNumber);
  83         // TODO: Write to FLASH
  84 }
  85
  86 static void ReadBlock(uint16_t BlockNumber)
  87 {
  88         uint8_t BlockBuffer[512];
  89         memset(BlockBuffer, 0x00, sizeof(BlockBuffer));
  90
  91         printf("READ %d", BlockNumber);
  92
  93         switch (BlockNumber)
  94         {
  95                 case 0:
  96                         memcpy(BlockBuffer, &BootBlock, sizeof(FATBootBlock_t));
  97                         printf(" <B>\r\n");
  98                         break;
  99
 100                 case 1:
 101                 case 2:
 102                         printf(" <F>\r\n");
 103
 104                         /* Cluster 0: Media type/Reserved */
 105                         ((uint16_t*)&BlockBuffer)[0] = 0xFF00 | BootBlock.MediaDescriptor;
 106
 107                         /* Cluster 1: Reserved */
 108                         ((uint16_t*)&BlockBuffer)[1] = 0xFFFF;
 109
 110                         /* Cluster 2 onwards: Cluster chain of FIRMWARE.BIN */
 111                         for (uint16_t i = 0; i < FILE_CLUSTERS(2049); i++)
 112                         {
 113                                 ((uint16_t*)&BlockBuffer)[i + 2] = i + 3;
 114                         }
 115
 116                         /* Mark last cluster as end of file */
 117                         ((uint16_t*)&BlockBuffer)[FILE_CLUSTERS(2049) + 3] = 0xFFFF;
 118                         break;
 119
 120                 case 3:
 121                         printf("<R>\r\n");
 122                         memcpy(BlockBuffer, &FirmwareFileEntry, sizeof(FATDirectoryEntry_t));
 123                         break;
 124
 125                 default:
 126                         if ((BlockNumber >= 4) && (BlockNumber < (4 + FILE_CLUSTERS(FIRMWARE_FILE_SIZE))))
 127                         {
 128                                 printf("<D>\r\n");
 129
 130                                 for (uint16_t i = 0; i < 512; i++)
 131                                   BlockBuffer[i] = '0' + BlockNumber; //A' + (i % 26);
 132                         }
 133
 134                         break;
 135         }
 136
 137         /* Wait until endpoint is ready before continuing */
 138         if (Endpoint_WaitUntilReady())
 139           return;
 140
 141         Endpoint_Write_Stream_LE(BlockBuffer, sizeof(BlockBuffer), NULL);
 142         Endpoint_ClearIN();
 143 }
 144
 145 void VirtualFAT_WriteBlocks(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo,
 146                             const uint32_t BlockAddress,
 147                             uint16_t TotalBlocks)
 148 {
 149         uint16_t CurrentBlock = (uint16_t)BlockAddress;
 150
 151         /* Emulated FAT is performed per-block, pass each requested block index
 152          * to the emulation function */
 153         while (TotalBlocks--)
 154           WriteBlock(CurrentBlock++);
 155 }
 156
 157 void VirtualFAT_ReadBlocks(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo,
 158                            const uint32_t BlockAddress,
 159                            uint16_t TotalBlocks)
 160 {
 161         uint16_t CurrentBlock = (uint16_t)BlockAddress;
 162
 163         /* Emulated FAT is performed per-block, pass each requested block index
 164          * to the emulation function */
 165         while (TotalBlocks--)
 166           ReadBlock(CurrentBlock++);
 167 }
 168