#include <LUFA/Drivers/USB/USB.h>
/* Macros: */
- #define VIRTUAL_MEMORY_BLOCK_SIZE 512
- #define ALLOCATION_UNIT_BLOCKS 4
- #define LUN_MEDIA_BLOCKS ((FLASHEND + 1) / VIRTUAL_MEMORY_BLOCK_SIZE) + 16
+ /** Size of the virtual FIRMWARE.BIN file in bytes. */
+ #define FIRMWARE_FILE_SIZE_BYTES (FLASHEND - (FLASHEND - BOOT_START_ADDR) + 1UL)
+
+ /** Number of sectors that comprise a single logical disk cluster. */
+ #define SECTOR_PER_CLUSTER 4
+
+ /** Size of a single logical sector on the disk. */
+ #define SECTOR_SIZE_BYTES 512
+
+ /** Size of a logical cluster on the disk, in bytes */
+ #define CLUSTER_SIZE_BYTES (SECTOR_PER_CLUSTER * SECTOR_SIZE_BYTES)
+
+ /** Number of sectors required to store a given size in bytes.
+ *
+ * \param[in] size Size of the data that needs to be stored
+ *
+ * \return Number of sectors required to store the given data on the disk.
+ */
+ #define FILE_SECTORS(size) ((size / SECTOR_SIZE_BYTES) + ((size % SECTOR_SIZE_BYTES) ? 1 : 0))
+
+ /** Number of clusters required to store a given size in bytes.
+ *
+ * \param[in] size Size of the data that needs to be stored
+ *
+ * \return Number of clusters required to store the given data on the disk.
+ */
+ #define FILE_CLUSTERS(size) ((size / CLUSTER_SIZE_BYTES) + ((size % CLUSTER_SIZE_BYTES) ? 1 : 0))
+
+ /** Total number of logical sectors/blocks on the disk. */
+ #define LUN_MEDIA_BLOCKS (FILE_SECTORS(FIRMWARE_FILE_SIZE_BYTES) + 32)
+
+ /** Converts a given time in HH:MM:SS format to a FAT filesystem time.
+ *
+ * \note The minimum seconds resolution of FAT is 2, thus odd seconds
+ * will be truncated to the previous integer multiple of 2 seconds.
+ *
+ * \param[in] hh Hours (0-23)
+ * \param[in] mm Minutes (0-59)
+ * \param[in] ss Seconds (0-59)
+ *
+ * \return Given time encoded as a FAT filesystem timestamp
+ */
+ #define FAT_TIME(hh, mm, ss) ((hh << 11) | (mm << 5) | (ss >> 1))
+
+ /** Converts a given date in DD/MM/YYYY format to a FAT filesystem date.
+ *
+ * \param[in] dd Days in the month (1-31)
+ * \param[in] mm Months in the year (1-12)
+ * \param[in] yyyy Year (1980 - 2107)
+ *
+ * \return Given date encoded as a FAT filesystem datestamp
+ */
+ #define FAT_DATE(dd, mm, yyyy) (((yyyy - 1980) << 9) | (mm << 5) | (dd << 0))
/* Type Definitions: */
+ /** FAT boot block structure definition, used to identify the core
+ * parameters of a FAT filesystem stored on a disk.
+ *
+ * \note This definition is truncated to save space; the magic signature
+ * 0xAA55 must be appended to the very end of the block for it to
+ * be detected by the host as a valid boot block.
+ */
typedef struct
{
uint8_t Bootstrap[3];
uint8_t Description[8];
- uint16_t BlockSize;
- uint8_t BlocksPerAllocationUnit;
- uint16_t ReservedBlocks;
+ uint16_t SectorSize;
+ uint8_t SectorsPerCluster;
+ uint16_t ReservedSectors;
uint8_t FATCopies;
uint16_t RootDirectoryEntries;
- uint16_t TotalBlocks16;
+ uint16_t TotalSectors16;
uint8_t MediaDescriptor;
- uint16_t BlocksPerFAT;
- uint16_t BlocksPerTrack;
+ uint16_t SectorsPerFAT;
+ uint16_t SectorsPerTrack;
uint16_t Heads;
- uint32_t HiddenBlocks;
- uint32_t TotalBlocks32;
+ uint32_t HiddenSectors;
+ uint32_t TotalSectors32;
uint16_t PhysicalDriveNum;
uint8_t ExtendedBootRecordSig;
uint32_t VolumeSerialNumber;
uint8_t VolumeLabel[11];
uint8_t FilesystemIdentifier[8];
- uint8_t BootstrapProgram[448];
- uint16_t MagicSignature;
+ /* uint8_t BootstrapProgram[448]; */
+ /* uint16_t MagicSignature; */
} FATBootBlock_t;
+ /** FAT legacy 8.3 style directory entry structure definition, used to
+ * identify the files and folders of FAT filesystem stored on a disk.
+ */
typedef struct
{
- uint8_t Filename[8];
- uint8_t Extension[3];
- uint8_t Attributes;
- uint8_t Reserved[10];
+ uint8_t Filename[8];
+ uint8_t Extension[3];
+ uint8_t Attributes;
+ uint8_t Reserved[10];
uint16_t CreationTime;
uint16_t CreationDate;
uint16_t StartingCluster;
- uint32_t FileSize;
+ uint32_t FileSizeBytes;
} FATDirectoryEntry_t;
/* Function Prototypes: */
+ #if defined(INCLUDE_FROM_VIRTUAL_FAT_C)
+ static void UpdateFAT12ClusterEntry(uint8_t* const FATTable,
+ const uint16_t Index,
+ const uint16_t ChainEntry);
+ static void WriteVirtualBlock(const uint16_t BlockNumber);
+ static void ReadVirtualBlock(const uint16_t BlockNumber);
+ #endif
+
void VirtualFAT_WriteBlocks(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo,
const uint32_t BlockAddress,
uint16_t TotalBlocks);
projects / pub / USBasp.git / blobdiff