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256 lines
9.1 KiB
256 lines
9.1 KiB
/*
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LUFA Library
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Copyright (C) Dean Camera, 2013.
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dean [at] fourwalledcubicle [dot] com
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www.lufa-lib.org
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*/
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/*
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Copyright 2013 Dean Camera (dean [at] fourwalledcubicle [dot] com)
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Permission to use, copy, modify, distribute, and sell this
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software and its documentation for any purpose is hereby granted
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without fee, provided that the above copyright notice appear in
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all copies and that both that the copyright notice and this
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permission notice and warranty disclaimer appear in supporting
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documentation, and that the name of the author not be used in
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advertising or publicity pertaining to distribution of the
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software without specific, written prior permission.
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The author disclaims all warranties with regard to this
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software, including all implied warranties of merchantability
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and fitness. In no event shall the author be liable for any
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special, indirect or consequential damages or any damages
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whatsoever resulting from loss of use, data or profits, whether
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in an action of contract, negligence or other tortious action,
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arising out of or in connection with the use or performance of
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this software.
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*/
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/** \file
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*
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* Virtualized FAT12 filesystem implementation, to perform self-programming
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* in response to read and write requests to the virtual filesystem by the
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* host PC.
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*/
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#define INCLUDE_FROM_VIRTUAL_FAT_C
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#include "VirtualFAT.h"
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/** FAT filesystem boot sector block, must be the first sector on the physical
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* disk so that the host can identify the presence of a FAT filesystem. This
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* block is truncated; normally a large bootstrap section is located near the
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* end of the block for booting purposes however as this is not meant to be a
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* bootable disk it is omitted for space reasons.
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*
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* \note When returning the boot block to the host, the magic signature 0xAA55
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* must be added to the very end of the block to identify it as a boot
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* block.
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*/
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static const FATBootBlock_t BootBlock =
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{
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.Bootstrap = {0xEB, 0x3C, 0x90},
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.Description = "mkdosfs",
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.SectorSize = SECTOR_SIZE_BYTES,
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.SectorsPerCluster = SECTOR_PER_CLUSTER,
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.ReservedSectors = 1,
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.FATCopies = 2,
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.RootDirectoryEntries = (SECTOR_SIZE_BYTES / sizeof(FATDirectoryEntry_t)),
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.TotalSectors16 = LUN_MEDIA_BLOCKS,
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.MediaDescriptor = 0xF8,
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.SectorsPerFAT = 1,
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.SectorsPerTrack = (LUN_MEDIA_BLOCKS % 64),
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.Heads = (LUN_MEDIA_BLOCKS / 64),
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.HiddenSectors = 0,
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.TotalSectors32 = 0,
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.PhysicalDriveNum = 0,
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.ExtendedBootRecordSig = 0x29,
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.VolumeSerialNumber = 0x12345678,
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.VolumeLabel = "LUFA BOOT ",
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.FilesystemIdentifier = "FAT12 ",
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};
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/** FAT 8.3 style directory entry, for the virtual FLASH contents file. */
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static FATDirectoryEntry_t FirmwareFileEntry =
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{
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.Filename = "FIRMWARE",
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.Extension = "BIN",
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.Attributes = 0,
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.Reserved = {0},
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.CreationTime = FAT_TIME(1, 1, 0),
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.CreationDate = FAT_DATE(14, 2, 1989),
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.StartingCluster = 2,
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.FileSizeBytes = FIRMWARE_FILE_SIZE_BYTES,
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};
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/** Updates a FAT12 cluster entry in the FAT file table with the specified next
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* chain index. If the cluster is the last in the file chain, the magic value
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* 0xFFF is used.
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*
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* \note FAT data cluster indexes are offset by 2, so that cluster 2 is the
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* first file data cluster on the disk. See the FAT specification.
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*
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* \param[out] FATTable Pointer to the FAT12 allocation table
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* \param[in] Index Index of the cluster entry to update
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* \param[in] ChainEntry Next cluster index in the file chain
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*/
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static void UpdateFAT12ClusterEntry(uint8_t* const FATTable,
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const uint16_t Index,
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const uint16_t ChainEntry)
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{
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/* Calculate the starting offset of the cluster entry in the FAT12 table */
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uint8_t FATOffset = (Index * 3) / 2;
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bool UpperNibble = (((Index * 3) % 2) != 0);
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/* Check if the start of the entry is at an upper nibble of the byte, fill
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* out FAT12 entry as required */
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if (UpperNibble)
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{
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FATTable[FATOffset] = (FATTable[FATOffset] & 0x0F) | ((ChainEntry & 0x0F) << 4);
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FATTable[FATOffset + 1] = (ChainEntry >> 4);
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}
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else
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{
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FATTable[FATOffset] = ChainEntry;
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FATTable[FATOffset + 1] = (FATTable[FATOffset] & 0xF0) | (ChainEntry >> 8);
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}
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}
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/** Writes a block of data to the virtual FAT filesystem, from the USB Mass
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* Storage interface.
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*
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* \param[in] BlockNumber Index of the block to write.
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*/
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static void WriteVirtualBlock(const uint16_t BlockNumber)
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{
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uint8_t BlockBuffer[SECTOR_SIZE_BYTES];
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/* Buffer the entire block to be written from the host */
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Endpoint_Read_Stream_LE(BlockBuffer, sizeof(BlockBuffer), NULL);
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Endpoint_ClearOUT();
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if ((BlockNumber >= 4) && (BlockNumber < (4 + FILE_SECTORS(FIRMWARE_FILE_SIZE_BYTES))))
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{
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uint32_t WriteFlashAddress = (uint32_t)(BlockNumber - 4) * SECTOR_SIZE_BYTES;
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for (uint16_t i = 0; i < SECTOR_SIZE_BYTES; i += 2)
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{
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if ((WriteFlashAddress % SPM_PAGESIZE) == 0)
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{
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/* Erase the given FLASH page, ready to be programmed */
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boot_page_erase(WriteFlashAddress);
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boot_spm_busy_wait();
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}
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/* Write the next data word to the FLASH page */
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boot_page_fill(WriteFlashAddress, (BlockBuffer[i + 1] << 8) | BlockBuffer[i]);
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WriteFlashAddress += 2;
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if ((WriteFlashAddress % SPM_PAGESIZE) == 0)
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{
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/* Write the filled FLASH page to memory */
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boot_page_write(WriteFlashAddress - SPM_PAGESIZE);
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boot_spm_busy_wait();
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}
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}
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}
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}
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/** Reads a block of data from the virtual FAT filesystem, and sends it to the
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* host via the USB Mass Storage interface.
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*
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* \param[in] BlockNumber Index of the block to read.
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*/
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static void ReadVirtualBlock(const uint16_t BlockNumber)
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{
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uint8_t BlockBuffer[SECTOR_SIZE_BYTES];
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memset(BlockBuffer, 0x00, sizeof(BlockBuffer));
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switch (BlockNumber)
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{
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case 0: /* Block 0: Boot block sector */
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memcpy(BlockBuffer, &BootBlock, sizeof(FATBootBlock_t));
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/* Add the magic signature to the end of the block */
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BlockBuffer[SECTOR_SIZE_BYTES - 2] = 0x55;
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BlockBuffer[SECTOR_SIZE_BYTES - 1] = 0xAA;
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break;
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case 1: /* Block 1: First FAT12 cluster chain copy */
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case 2: /* Block 2: Second FAT12 cluster chain copy */
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/* Cluster 0: Media type/Reserved */
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UpdateFAT12ClusterEntry(BlockBuffer, 0, 0xF00 | BootBlock.MediaDescriptor);
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/* Cluster 1: Reserved */
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UpdateFAT12ClusterEntry(BlockBuffer, 1, 0xFFF);
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/* Cluster 2 onwards: Cluster chain of FIRMWARE.BIN */
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for (uint16_t i = 0; i < FILE_CLUSTERS(FIRMWARE_FILE_SIZE_BYTES); i++)
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UpdateFAT12ClusterEntry(BlockBuffer, i+2, i+3);
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/* Mark last cluster as end of file */
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UpdateFAT12ClusterEntry(BlockBuffer, FILE_CLUSTERS(FIRMWARE_FILE_SIZE_BYTES) + 1, 0xFFF);
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break;
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case 3: /* Block 3: Root file entries */
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memcpy(BlockBuffer, &FirmwareFileEntry, sizeof(FATDirectoryEntry_t));
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break;
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default: /* Blocks 4 onwards: Data allocation section */
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if ((BlockNumber >= 4) && (BlockNumber < (4 + FILE_SECTORS(FIRMWARE_FILE_SIZE_BYTES))))
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{
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uint32_t ReadFlashAddress = (uint32_t)(BlockNumber - 4) * SECTOR_SIZE_BYTES;
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for (uint16_t i = 0; i < SECTOR_SIZE_BYTES; i++)
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BlockBuffer[i] = pgm_read_byte_far(ReadFlashAddress++);
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}
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break;
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}
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/* Write the entire read block Buffer to the host */
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Endpoint_Write_Stream_LE(BlockBuffer, sizeof(BlockBuffer), NULL);
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Endpoint_ClearIN();
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}
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/** Writes a number of blocks to the virtual FAT file system, from the host
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* PC via the USB Mass Storage interface.
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*
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* \param[in] MSInterfaceInfo Pointer to a structure containing a Mass Storage Class configuration and state
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* \param[in] BlockAddress Data block starting address for the write sequence
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* \param[in] TotalBlocks Number of blocks of data to write
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*/
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void VirtualFAT_WriteBlocks(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo,
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const uint32_t BlockAddress,
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uint16_t TotalBlocks)
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{
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uint16_t CurrentBlock = (uint16_t)BlockAddress;
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/* Emulated FAT is performed per-block, pass each requested block index
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* to the emulated FAT block write function */
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while (TotalBlocks--)
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WriteVirtualBlock(CurrentBlock++);
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}
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/** Reads a number of blocks from the virtual FAT file system, and sends them
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* to the host PC via the USB Mass Storage interface.
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*
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* \param[in] MSInterfaceInfo Pointer to a structure containing a Mass Storage Class configuration and state
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* \param[in] BlockAddress Data block starting address for the read sequence
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* \param[in] TotalBlocks Number of blocks of data to read
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*/
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void VirtualFAT_ReadBlocks(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo,
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const uint32_t BlockAddress,
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uint16_t TotalBlocks)
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{
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uint16_t CurrentBlock = (uint16_t)BlockAddress;
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/* Emulated FAT is performed per-block, pass each requested block index
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* to the emulated FAT block read function */
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while (TotalBlocks--)
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ReadVirtualBlock(CurrentBlock++);
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}
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