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 #define FAT_TIME(h, m, s)      ((h << 11) | (m << 5) | (s >> 1))
  34 #define FAT_DATE(d, m, y)      (((y - 1980) << 9) | (m << 5) | (d << 0))
  35
  36 #define SECTOR_SIZE_BYTES      VIRTUAL_MEMORY_BLOCK_SIZE
  37 #define SECTOR_PER_CLUSTER     4
  38 #define CLUSTER_SIZE_BYTES     (SECTOR_PER_CLUSTER * SECTOR_SIZE_BYTES)
  39
  40 #define FILE_CLUSTERS(size)    (size / CLUSTER_SIZE_BYTES)
  41
  42 static const FATBootBlock_t BootBlock =
  43         {
  44                 .Bootstrap               = {0xEB, 0x3C, 0x90},
  45                 .Description             = "mkdosfs",
  46                 .SectorSize              = SECTOR_SIZE_BYTES,
  47                 .SectorsPerCluster       = SECTOR_PER_CLUSTER,
  48                 .ReservedSectors         = 1,
  49                 .FATCopies               = 2,
  50                 .RootDirectoryEntries    = SECTOR_SIZE_BYTES / sizeof(FATDirectoryEntry_t),
  51                 .TotalSectors16          = LUN_MEDIA_BLOCKS,
  52                 .MediaDescriptor         = 0xF8,
  53                 .SectorsPerFAT           = 1,
  54                 .SectorsPerTrack         = 32,
  55                 .Heads                   = 64,
  56                 .HiddenSectors           = 0,
  57                 .TotalSectors32          = 0,
  58                 .PhysicalDriveNum        = 0,
  59                 .ExtendedBootRecordSig   = 0x29,
  60                 .VolumeSerialNumber      = 0x12345678,
  61                 .VolumeLabel             = "LUFA BOOT  ",
  62                 .FilesystemIdentifier    = "FAT16   ",
  63                 .BootstrapProgram        = {0},
  64                 .MagicSignature          = 0xAA55,
  65         };
  66
  67 static FATDirectoryEntry_t FirmwareFileEntry =
  68         {
  69                 .Filename        = "FIRMWARE",
  70                 .Extension       = "BIN",
  71                 .Attributes      = 0,
  72                 .Reserved        = {0},
  73                 .CreationTime    = FAT_TIME(1, 1, 0),
  74                 .CreationDate    = FAT_DATE(14, 2, 1989),
  75                 .StartingCluster = 2,
  76                 .FileSizeBytes   = 2049,
  77         };
  78
  79 static void WriteBlock(uint16_t BlockNumber)
  80 {
  81         uint8_t BlockBuffer[512];
  82
  83         /* Wait until endpoint is ready before continuing */
  84         if (Endpoint_WaitUntilReady())
  85           return;
  86
  87         Endpoint_Read_Stream_LE(BlockBuffer, sizeof(BlockBuffer), NULL);
  88         Endpoint_ClearOUT();
  89
  90         printf("WRITE %d\r\n", BlockNumber);
  91         // TODO: Write to FLASH
  92 }
  93
  94 static void ReadBlock(uint16_t BlockNumber)
  95 {
  96         uint8_t BlockBuffer[512];
  97         memset(BlockBuffer, 0x00, sizeof(BlockBuffer));
  98
  99         printf("READ %d", BlockNumber);
 100
 101         switch (BlockNumber)
 102         {
 103                 case 0:
 104                         memcpy(BlockBuffer, &BootBlock, sizeof(FATBootBlock_t));
 105                         printf(" <B>\r\n");
 106                         break;
 107
 108                 case 1:
 109                 case 2:
 110                         printf(" <F>\r\n");
 111
 112                         /* Cluster 0: Media type/Reserved */
 113                         ((uint16_t*)&BlockBuffer)[0] = 0xFF00 | BootBlock.MediaDescriptor;
 114
 115                         /* Cluster 1: Reserved */
 116                         ((uint16_t*)&BlockBuffer)[1] = 0xFFFF;
 117
 118                         /* Cluster 2 onwards: Cluster chain of FIRMWARE.BIN */
 119                         for (uint16_t i = 0; i < FILE_CLUSTERS(2049); i++)
 120                         {
 121                                 ((uint16_t*)&BlockBuffer)[i + 2] = i + 3;
 122                         }
 123
 124                         /* Mark last cluster as end of file */
 125                         ((uint16_t*)&BlockBuffer)[FILE_CLUSTERS(2049) + 3] = 0xFFFF;
 126                         break;
 127
 128                 case 3:
 129                         printf("<R>\r\n");
 130                         memcpy(BlockBuffer, &FirmwareFileEntry, sizeof(FATDirectoryEntry_t));
 131                         break;
 132
 133                 default:
 134                         if ((BlockNumber >= 4) && (BlockNumber < (4 + FILE_CLUSTERS(FIRMWARE_FILE_SIZE))))
 135                         {
 136                                 printf("<D>\r\n");
 137
 138                                 for (uint16_t i = 0; i < 512; i++)
 139                                   BlockBuffer[i] = '0' + BlockNumber; //A' + (i % 26);
 140                         }
 141
 142                         break;
 143         }
 144
 145         /* Wait until endpoint is ready before continuing */
 146         if (Endpoint_WaitUntilReady())
 147           return;
 148
 149         Endpoint_Write_Stream_LE(BlockBuffer, sizeof(BlockBuffer), NULL);
 150         Endpoint_ClearIN();
 151 }
 152
 153 void VirtualFAT_WriteBlocks(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo,
 154                             const uint32_t BlockAddress,
 155                             uint16_t TotalBlocks)
 156 {
 157         uint16_t CurrentBlock = (uint16_t)BlockAddress;
 158
 159         while (TotalBlocks--)
 160           WriteBlock(CurrentBlock++);
 161 }
 162
 163 void VirtualFAT_ReadBlocks(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo,
 164                            const uint32_t BlockAddress,
 165                            uint16_t TotalBlocks)
 166 {
 167         uint16_t CurrentBlock = (uint16_t)BlockAddress;
 168
 169         while (TotalBlocks--)
 170           ReadBlock(CurrentBlock++);
 171 }
 172