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Add EEPROM read/write support to the Mass Storage class bootloader.

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This commit is contained in:
Dean Camera 2013-03-30 17:16:29 +00:00
parent 829ecefe41
commit 7251da6581
2 changed files with 200 additions and 49 deletions
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63
Bootloaders/MassStorage/Lib/VirtualFAT.h
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@ -40,8 +40,11 @@
#include "../BootloaderAPI.h"
/* Macros: */
/** Size of the virtual FIRMWARE.BIN file in bytes. */
#define FIRMWARE_FILE_SIZE_BYTES (FLASHEND - (FLASHEND - BOOT_START_ADDR) - AUX_BOOT_SECTION_SIZE)
/** Size of the virtual FLASH.BIN file in bytes. */
#define FLASH_FILE_SIZE_BYTES (FLASHEND - (FLASHEND - BOOT_START_ADDR) - AUX_BOOT_SECTION_SIZE)
/** Size of the virtual EEPROM.BIN file in bytes. */
#define EEPROM_FILE_SIZE_BYTES E2END
/** Number of sectors that comprise a single logical disk cluster. */
#define SECTOR_PER_CLUSTER 4
@ -69,7 +72,7 @@
#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)
#define LUN_MEDIA_BLOCKS (FILE_SECTORS(FLASH_FILE_SIZE_BYTES) + FILE_SECTORS(EEPROM_FILE_SIZE_BYTES) + 32)
/** Converts a given time in HH:MM:SS format to a FAT filesystem time.
*
@ -94,6 +97,34 @@
*/
#define FAT_DATE(dd, mm, yyyy) (((yyyy - 1980) << 9) | (mm << 5) | (dd << 0))
/** Bit-rotates a given 8-bit value once to the right.
*
* \param x Value to rotate right once
*
* \return Bit-rotated input value, rotated once to the right.
*/
#define _ROT8(x) ((((x) & 0xFE) >> 1) | (((x) & 1) ? 0x80 : 0x00))
/** Computes the LFN entry checksum of a MSDOS 8.3 format file entry,
* to associate a LFN entry with its short file entry.
*
* \param n0 MSDOS Filename character 1
* \param n1 MSDOS Filename character 2
* \param n2 MSDOS Filename character 3
* \param n3 MSDOS Filename character 4
* \param n4 MSDOS Filename character 5
* \param n5 MSDOS Filename character 6
* \param n6 MSDOS Filename character 7
* \param n7 MSDOS Filename character 8
* \param e0 MSDOS Extension character 1
* \param e1 MSDOS Extension character 2
* \param e2 MSDOS Extension character 3
*
* \return LFN checksum of the given MSDOS 8.3 filename.
*/
#define FAT_CHECKSUM(n0, n1, n2, n3, n4, n5, n6, n7, e0, e1, e2) \
(uint8_t)(_ROT8(_ROT8(_ROT8(_ROT8(_ROT8(_ROT8(_ROT8(_ROT8(_ROT8(_ROT8(n0)+n1)+n2)+n3)+n4)+n5)+n6)+n7)+e0)+e1)+e2)
/** \name FAT Filesystem Flags */
//@{
/** FAT attribute flag to indicate a read-only file. */
@ -129,10 +160,14 @@
{
/** Volume ID directory entry, giving the name of the virtual disk. */
DISK_FILE_ENTRY_VolumeID = 0,
/** Long File Name FAT file entry of the virtual firmware image file. */
DISK_FILE_ENTRY_FirmwareLFN = 1,
/** Legacy MSDOS FAT file entry of the virtual firmware image file. */
DISK_FILE_ENTRY_FirmwareMSDOS = 2,
/** Long File Name FAT file entry of the virtual FLASH.BIN image file. */
DISK_FILE_ENTRY_FLASH_LFN = 1,
/** Legacy MSDOS FAT file entry of the virtual FLASH.BIN image file. */
DISK_FILE_ENTRY_FLASH_MSDOS = 2,
/** Long File Name FAT file entry of the virtual EEPROM.BIN image file. */
DISK_FILE_ENTRY_EEPROM_LFN = 3,
/** Legacy MSDOS FAT file entry of the virtual EEPROM.BIN image file. */
DISK_FILE_ENTRY_EEPROM_MSDOS = 4,
};
/** Enum for the physical disk blocks of the virtual disk. */
@ -243,9 +278,17 @@
const uint16_t Index,
const uint16_t ChainEntry) AUX_BOOT_SECTION;
static void ReadWriteFirmwareFileBlock(const uint16_t BlockNumber,
uint8_t* BlockBuffer,
const bool Read) AUX_BOOT_SECTION;
static void UpdateFAT12ClusterChain(uint8_t* const FATTable,
const uint16_t StartIndex,
const uint16_t ChainLength) AUX_BOOT_SECTION;
static void ReadWriteFLASHFileBlock(const uint16_t BlockNumber,
uint8_t* BlockBuffer,
const bool Read) AUX_BOOT_SECTION;
static void ReadWriteEEPROMFileBlock(const uint16_t BlockNumber,
uint8_t* BlockBuffer,
const bool Read) AUX_BOOT_SECTION;
#endif
void VirtualFAT_WriteBlock(const uint16_t BlockNumber) AUX_BOOT_SECTION;