GBA NDS FAT

	GBA NDS FAT
General
Author(s)	chishm (Michael Chisholm)
Type	PC Utility
Version	2005-06-12
Licence	Mixed
Links
	[Media:Gbandsfat20060303 Download]
	Website

User guide

Fully supported:

GBA Movie Player CF

GBAMP

Neoflash MK2 and MK3

Neoflash MK2

SuperCard CF

M3 Adapter CF

Partially supported devices (read only, disabled by default):

SuperCard SD

M3 Adapter SD

EFA 2

Changelog

2005-06-12

Successfully reverse engineered the reading of compact flash cards

2005-06-13

Started work on file system driver

2005-06-15

First release of file system driver
File reading implemented

2005-06-24

Second proper release
All known bugs fixed
File writing implemented
File functions behave as expected
Long filenames now work

2005-06-27

Third release
Bug fix for small cards
FAT32 implemented
Structure packing changed to be more compatible with non GCC compilers

2005-07-12

Some bug fixes:
Reading & writing files on FAT16 cards in the root directory is now fixed
Accessing files near the end of FAT32 cards is now fixed

2005-07-13

Added option not to use DMA

2005-07-14

Fixed FAT_fseek() buffer bug

2005-07-24

Modified for use on the NDS
When using it on the ARM9 you don't need to modify anything. On the ARM7 you will have to manually define NDS.

2005-08-05

Fixed FAT_fopen bug in append mode
Fixed FAT_AddDirEntry bug that created orphen clusters if a directory entry was created that filled the end of a cluster

2005-08-07

Fixed FAT_CWD bug when changing to ".." from a 1st level subdirectory

2005-08-21

Added FAT_GetFileSize - Returns the size of the last file accessed
Included automatic memory access control setting for the NDS
Removed typedef of bool (not needed with libnds)

'2005-09-05

Added FAT_GetFileCluster - Returns the start cluster of the last file accessed

2005-09-10

Fixed problem with FAT_GetDirEntry not initialising the attrib of the returned DIR_ENT

2005-09-15

Added ability to read multiple sectors at once
Improved FAT_fread and FAT_fwrite functions
Fixed bug when trying to create a file in a non-existant directory

2005-09-18

Fixed fseek bug with u32 offset instead of s32. Thanks goes to MightyMax for pointing that out

2005-09-21

Improved FAT_fseek speed

2005-10-12

Fixed long file name bug in FAT_GetDirEntry. Thanks goes to MoonLight for pointing it out

2005-10-15

Changed file functions to use FAT_FILE* handles instead of int handles. Please change your code to reflect this change
Split source into hardware and disk level files and renamed the files. Include gba_nds_cf.h into your project instead of gbamp_cf.h
Added M3 adapter support

2005-10-16

Added file time and date modification for writing, thanks to Joat

2005-10-17

Fixed FAT_fseek when trying to SEEK_END, thanks to MoonLight

2005-10-31

Changed FAT_CWD to FAT_chdir
FAT_ftell now returns u32 instead of long int

2005-11-06

Added FAT12 support and fixed FAT buffer bugs
Added FAT_FileExists - returns FT_NONE if no file exists, FT_DIR or FT_FILE if it does
Completely changed the hardware interface, with a big thanks to MightyMax for doing most of the work
Added SuperCard CF support

2005-11-07

Switched to memcpy instead of copy loops in fread and fwrite

2005-11-08

Added ability to use unaligned buffers, thanks to wwcube
No longer need to define NDS when compiling for the NDS (this is automatically done for you)

2005-11-09

Long directory entries are now fit amongst old ones, rather than at the end
Changed FAT_DeleteFile to FAT_remove and added ability to remove empty directories
Added FAT_mkdir to create a new directory

2005-11-14

Improved error handling in FAT_fread and FAT_fwrite
FAT_GetLongFilename uses strncpy instead of custom code
Added DMA support for use on NDS

2005-11-15

FAT_fopen uses string functions for checking mode

2005-11-17

Added FAT_fgets and FAT_fputs, with thanks again to MightyMax

2005-11-21

Removed EOF marking from FAT_fclose
FAT_fwrite now takes a const void* buffer. rather than a void* buffer
FAT_fwrite initialises new sectors before using them

2005-11-24

Fixed FAT_fseek bug, thanks to AgentQ
Added cluster allocation in FAT_fseek
FAT_fopen now checks for read only files
Added FAT_FindFirstFileLFN and FAT_FindNextFileLFN - Long file name versions of FAT_FindFirstFile and FAT_FindNextFile

2005-11-25

Clusters are now allocated as they are needed.
Fixed seeking in append mode
Fixed adding of new directory entries
Added support for standard GBA Flash Carts, with SRAM

2005-11-26

disc_io now has a HostType function, for determining what type of flash cart is inserted.

2005-11-27

Fixed reading / writing of sector buffer in FAT_fread and FAT_fwrite, thanks to AgentQ

2006-01-04

Fixed FAT_fwrite when writing in cluster aligned chunks

2006-02-09

Fixed file and directory names starting with a dot ("."), or containing more than one dot
Added Neoflash MK2 / MK3 support, thanks to www.neoflash.com
Modified CF access routines to mask of the high byte of the status register, hopefully improving compatibility
Added disc caching, thanks to www.neoflash.com . It can only be enabled on the DS (not GBA) since it will consume 128KB of memory on the default setting. It is advisable to call FAT_FreeFiles() before shut down if caching is enabled, to flush any writes to disc
Added Supercard SD test code. It unfortunately doesn't work, and is disabled by default
Added FAT total size and type functions
Added file creation and modification functions. Disabled by default, see gba_nds_fat.h for more info
Fixed AddDirEntry bugs:
should no longer corrupt a directory when adding a new file
no longer puts garbage into a short file name's extension, thanks to 0xtob
long file names with less than 12 characters now work, thanks to DragonMinded for pointing it out

2006-03-03

Improved NMMC (MK2 / MK3) driver
Optimised LFNs into loops, thanks to dwedit
Optimised SuperCard SD CFC7, thanks to Cory1492
Added file attribute support
Added read only M3 SD support, thanks to SaTa and Moonlight. Disabled by default due to incompleteness
Fixed SuperCard SD reading, thanks to Loopy
Added EFA2 support, thanks to CyteX

Credits

FAT_NextCluster was based on routines in fat.c, which is part of avrlib by Pascal Stang.

Darkfader helped with low level CF reading and writing.

MightyMax added support for the M3.

MightyMax also gave me a new hardware interface.

Thanks Tepples for answers to my questions.

The author of maverick-os for the documentation about the FAT16 file system.

CF routines were modified with help from Darkfader.

Dwedit was very helpful in discovering bugs.

SaTa was the first to add automatic memory access control settings.

MoonLight came up with the idea of getting the size of files.

MightyMax has helped with fseek.

Joat provided system time and date functions.

wwcube provided example patches for unaligned buffer support.

MightyMax wrote FAT_fgets and FAT_fputs.

www.neoflash.com provided the routines to access the MK2 / MK3. They also added sector caching.

0xtob fixed a bug in AddDirEntry that corrupted short filename extensions.

Dwedit rolled up the LFN loops.

cory1492 improved the SuperCard SD driver.

SaTa and Moonlight provided a read only M3 SD driver.

Loopy fixed SuperCard SD reading.

CyteX added EFA2 support.