FAT filesystem top level header file. More...

#include <stdint.h>

Classes
struct	tsDevInfo
	This structure provides the FAT drivers with the necessary information to interface to the physical media. More...
struct	FAT_DIRENT
	This structure describes a directory entry from FAT_readdir(). More...

Macros
#define	FATFS_OK 0
	The following are the error codes used by the FAT driver.
#define	FATFS_INVALID_PATH -1
	Path was not valid 8.3.
#define	FATFS_FILE_NOT_FOUND -2
	File was not found.
#define	FATFS_FAT_TYPE_NOT_SUPPORTED -3
	FAT type not supported.
#define	FATFS_DEVICE_READ_FAILED -4
	Read from device failed.
#define	FATFS_DEVICE_WRITE_FAILED -5
	Write to device failed.
#define	FATFS_DIR_NOT_FOUND -6
	Sub-directory not found.
#define	FATFS_FILE_CREATE_FAILED -7
	File creation failed.
#define	FATFS_FILEID_OUT_OF_RANGE -8
	File ID out of range.
#define	FATFS_DIRECTORY_FULL -9
	Directory is full.
#define	FATFS_DISK_FULL -10
	Device is full.
#define	FATFS_FILEID_NOT_OPENED -11
	Specified file ID not opened.
#define	FATFS_BAD_SEEK_ORIGIN -12
	Bad origin provided for seek cmd.
#define	FATFS_INVALID_PARTITION -13
	Invalid partition data.
#define	FATFS_FILE_ALREADY_EXISTS -14
	Attempt to overwrite an existing file failed.
#define	FATFS_DIRECTORY_NOT_EMPTY -15
	Directory must be empty prior to deletion.
#define	FAT_ATTRIB_READONLY 0x01
	The following are the valid FAT file attributes.
#define	FAT_ATTRIB_HIDDEN 0x02
#define	FAT_ATTRIB_SYSTEM 0x04
#define	FAT_ATTRIB_VOLUMELABEL 0x08
#define	FAT_ATTRIB_SUBDIR 0x10
#define	FAT_ATTRIB_ARCHIVE 0x20
#define	FAT_ATTRIB_DEVICE 0x40
#define	FATIONOATIME 0x89F0
	Device private ioctl calls (From GNU C headers...)

Typedefs
typedef int(*	RAWREAD )(uint32_t start_sector, uint32_t offset, char buffer, uint32_t length, void apDriverData)
	Template function for Device Read Request used by FAT driver software.
typedef int(*	RAWWRITE )(uint32_t start_sector, uint32_t offset, char buffer, uint32_t length, void apDriverData)
	Template function for Device Write Request used by FAT driver software.
typedef int(*	GETTIME )(unsigned int apYear, unsigned int apMonth, unsigned int apDay, unsigned int apHour, unsigned int apMinutes, unsigned int apSeconds, unsigned int *apHundredths)
	Template function for the Real-Time Clock access used by FAT driver software.
typedef int(*	DEBUGHANDLER )(const char *apErrorString, int aeSeverity)
	Debugging string for FAT development.
typedef struct FAT_DIRENT	FAT_dirent
	This structure describes a directory entry from FAT_readdir().
typedef void	FAT_DIR

Functions
int	RegisterFATDriver (RAWREAD apRawReadFunc, RAWWRITE apRawWriteFunc, GETTIME apGetTimeFunc, tsDevInfo apRawInfo, char apDeviceName, void *apDriverData)
	Register a FAT device/driver with BIOS CIO utilities.
int	RemoveFATDriver (char *name)
	REMOVE a FAT device/driver with BIOS CIO utilities.
int	RegisterFATDebugHandler (DEBUGHANDLER apDebugFunc, void *apUserData)
int	FAT_format (tsDevInfo apRawInfo, RAWWRITE apRawWriteFunc, char apFATType, void *apDriverData)
	FORMAT a device with a FAT filesystem.
int	FAT_mkdir (const char *path)
	Create directory on a FAT FileSystem.
int	FAT_rmdir (const char *path)
	Remove an empty directory on a FAT FileSystem.
double	FAT_getdiskfree (const char *apDrive)
	Computes the free space on a device based upon the free cluster count.
int	FAT_ioctl (const char apDevName, int cmd, void argp)
	IOCTL for FAT filasystem Supported IOCTLs are.
FAT_DIR *	FAT_opendir (const char *dirname)
	Open directory for reading (listing).
int	FAT_closedir (FAT_DIR *dirp)
	Close / Free resources associated with FAT_DIR structure initialized with FAT_opendir().
int	FAT_readdir (FAT_DIR dirp, FAT_dirent direntp)
	Read next directory entry of FAT directory structure.
int	FAT_rewinddir (FAT_DIR *dirp)
	Resets directory listing pointer to beginning of list for a valid FAT_DIR entry as initalized by FAT_opendir.

Detailed Description

FAT filesystem top level header file.

This file contains the header information necessary for intializing a FAT filesystem device.

Author:: Critical Link LLC

      o  0
      | /       Copyright (c) 2007-2008
     (CL)---o   Critical Link, LLC
       \
        O

Macro Definition Documentation

#define FATFS_OK 0

The following are the error codes used by the FAT driver.

No error

#define FATFS_INVALID_PATH -1

Path was not valid 8.3.

#define FATFS_FILE_NOT_FOUND -2

File was not found.

#define FATFS_FAT_TYPE_NOT_SUPPORTED -3

FAT type not supported.

#define FATFS_DEVICE_READ_FAILED -4

Read from device failed.

#define FATFS_DEVICE_WRITE_FAILED -5

Write to device failed.

#define FATFS_DIR_NOT_FOUND -6

Sub-directory not found.

#define FATFS_FILE_CREATE_FAILED -7

File creation failed.

#define FATFS_FILEID_OUT_OF_RANGE -8

File ID out of range.

#define FATFS_DIRECTORY_FULL -9

Directory is full.

#define FATFS_DISK_FULL -10

Device is full.

#define FATFS_FILEID_NOT_OPENED -11

Specified file ID not opened.

#define FATFS_BAD_SEEK_ORIGIN -12

Bad origin provided for seek cmd.

#define FATFS_INVALID_PARTITION -13

Invalid partition data.

#define FATFS_FILE_ALREADY_EXISTS -14

Attempt to overwrite an existing file failed.

#define FATFS_DIRECTORY_NOT_EMPTY -15

Directory must be empty prior to deletion.

#define FAT_ATTRIB_READONLY 0x01

The following are the valid FAT file attributes.

#define FAT_ATTRIB_HIDDEN 0x02

#define FAT_ATTRIB_SYSTEM 0x04

#define FAT_ATTRIB_VOLUMELABEL 0x08

#define FAT_ATTRIB_SUBDIR 0x10

#define FAT_ATTRIB_ARCHIVE 0x20

#define FAT_ATTRIB_DEVICE 0x40

#define FATIONOATIME 0x89F0

Device private ioctl calls (From GNU C headers...)

Typedef Documentation

typedef int(* RAWREAD)(uint32_t start_sector, uint32_t offset, char *buffer, uint32_t length, void *apDriverData)

Template function for Device Read Request used by FAT driver software.

Parameters:

[in]	start_sector	starting sector to read from
[in]	offset	numbet of bytes from beginning of sector
[in,out]	buffer	buffer to store requested data from device
[in]	length	number of bytes to retrieve
[in]	apDriverData	Drive Data Info, see RegisterFATDriver

Returns:: number of bytes read, or -1 on error.

typedef int(* RAWWRITE)(uint32_t start_sector, uint32_t offset, char *buffer, uint32_t length, void *apDriverData)

Template function for Device Write Request used by FAT driver software.

Parameters:

[in]	start_sector	starting sector to read from
[in]	offset	numbet of bytes from beginning of sector
[in]	buffer	buffer to copy requested data to device
[in]	length	number of bytes to write
[in]	apDriverData	Drive Data Info, see RegisterFATDriver

Returns:: number of bytes written, or -1 on error.

typedef int(* GETTIME)(unsigned int *apYear, unsigned int *apMonth, unsigned int *apDay, unsigned int *apHour, unsigned int *apMinutes, unsigned int *apSeconds, unsigned int *apHundredths)

Template function for the Real-Time Clock access used by FAT driver software.

Parameters:

[out]	apYear	Year (1900-20??).
[out]	apMonth	Month (1-12).
[out]	apDay	Day of the month (1-31).
[out]	apHour	Hours since midnight (0-23).
[out]	apMinutes	Minutes (0-59).
[out]	apSeconds	Seconds (0-59).
[out]	apHundredths	Hundredths of a second (0-99), always zero if not supported by RTC.

Returns:: Zero if successful, or -1 on error.

typedef int(* DEBUGHANDLER)(const char *apErrorString, int aeSeverity)

Debugging string for FAT development.

Parameters:

[in]	apErrorString	string describing error condition
[in]	aeSeverity	range 0-3 (debug, status, warning, error)

Returns:: 0

typedef struct FAT_DIRENT FAT_dirent

This structure describes a directory entry from FAT_readdir().

typedef void FAT_DIR

Function Documentation

int RegisterFATDriver	(	RAWREAD	apRawReadFunc,
		RAWWRITE	apRawWriteFunc,
		GETTIME	apGetTimeFunc,
		tsDevInfo *	apRawInfo,
		char *	apDeviceName,
		void *	apDriverData
	)

Register a FAT device/driver with BIOS CIO utilities.

This routine will load/interrogate the FAT tables on the provided device and register the device driver with the TI stdio lookup table.

Note:: the current implementation supports up to 5 separate FAT devices to be "mounted" or configured on the MityDSP platform at any one time.; Once a system is registered, files may be accessed using fopen, etc., with "apDeviceName:" (minus the quotes) prepended to the path. There is no notion of a "current working directory" other than the "root" directory. So paths must always be fully qualified to open files in subdirectories.; A maximum of 5 FAT devices is currently supported.

Parameters:

[in]	apRawReadFunc	Pointer to RawRead Function used by Driver.
[in]	apRawWriteFunc	Pointer to RawWrite function used by Driver.
[in]	apGetTimeFunc	Pointer to RTC function used by Driver (if no RTC available, should be NULL to use tick timer).
[in]	apRawInfo	Raw Device Info, required by FAT Driver.
[in]	apDeviceName	Name of device, e.g. "RAMDISK". Must be less than 32 characters. This name is used to specify a path to fopen() from BIOS, e.g., "RAMDISK:\my\home\directory".
[in]	apDriverData	Driver Data passed to RawRead and RawWrite Routines.

Returns:: FATFS_OK (0) on success, else an error occurred.

int RemoveFATDriver ( char * apDeviceName )

REMOVE a FAT device/driver with BIOS CIO utilities.

This routine will remove a FAT device.

Parameters:

[in] apDeviceName Name of device, e.g. "RAMDISK". Must be less than 32 characters. This name is used to specify a path to fopen() from BIOS, e.g., "RAMDISK:\my\home\directory".

Returns:: FATFS_OK (0) on success, else an error occurred.

int RegisterFATDebugHandler	(	DEBUGHANDLER	apDebugFunc,
		void *	apUserData
	)

int FAT_format	(	tsDevInfo *	apRawInfo,
		RAWWRITE	apRawWriteFunc,
		char *	apFATType,
		void *	apDriverData
	)

FORMAT a device with a FAT filesystem.

This routine is useful for non-volatile devices requiring a FAT filesystem.

Note:: Currently, this routine will only support devices with 512 byte sector sizes.

Parameters:

[in]	apRawInfo	Device Info Structure required by FAT formatting logic.
[in]	apRawWriteFunc	Raw Write routine called during format operation.
[in]	apFATType	"FAT16" (FAT32 and FAT 12 are currently not supported)
[in]	apDriverData	device drive info passwd to apRawWriteFunc.

Returns:: FATFS_OK (0) on success, or non-zero on error.

int FAT_mkdir ( const char * apPath )

Create directory on a FAT FileSystem.

Parameters:

[in] apPath Fully qualified path of directory to create

Returns:: FATFS_OK (0) on success, FATFS_INVALID_PATH (-1) if the path was not valid, or another negative number upon error.

int FAT_rmdir ( const char * apPath )

Remove an empty directory on a FAT FileSystem.

Parameters:

[in] apPath Fully qualified path of directory to create

Returns:: FATFS_OK (0) on success, FATFS_INVALID_PATH (-1) if the path was not valid, FATFS_DIRECTORY_NOT_EMPTY if the directory still has files in it, FATFS_FILE_NOT_FOUND if the path does not point to a valid file, or another negative number upon error.

double FAT_getdiskfree ( const char * apDrive )

Computes the free space on a device based upon the free cluster count.

Parameters:

[in] apDrive Path name (including at least the device identifier) of the device to compute free space for.

Returns:: Free space remaining, in bytes (double precision).

int FAT_ioctl	(	const char *	apDevName,
		int	cmd,
		void *	argp
	)

IOCTL for FAT filasystem Supported IOCTLs are.

FATIONOATIME - set arg to a uint32 pointer. Value of 1 to disable accesstime on readonly files

Parameters:

[in]	apDevName	- Device name to perform IOCTL on
[in]	cmd	- IOCTL command to implement
[in]	argp	- cmd specific data

Returns:: Zero on success, -1 if an error occurred.

FAT_DIR* FAT_opendir ( const char * apDirName )

Open directory for reading (listing).

Use this call in combination with FAT_readdir, FAT_closedir, and FAT_rewinddir in order to gather contents of a specified directory.

Parameters:

[in] apDirName Fully qualified path of interest

Returns:: Pointer to FAT directory control structure, if the path was not found, NULL is returned.

int FAT_closedir ( FAT_DIR * ahDir )

Close / Free resources associated with FAT_DIR structure initialized with FAT_opendir().

Parameters:

[in] ahDir Pointer to successfully opened FAT_DIR structure

Returns:: FATFS_OK on success.

int FAT_readdir	(	FAT_DIR *	ahDir,
		FAT_dirent *	apDirent
	)

Read next directory entry of FAT directory structure.

Parameters:

[in]	ahDir	Pointer to a valid FAT_DIR from FAT_opendir
[out]	apDirent	Pointer to a valid buffer to populate with listing contents.

Returns:: FATFS_OK (0) on success, FATFS_FILE_NOT_FOUND (-2) at end of directory, or another negative number upon error.

int FAT_rewinddir ( FAT_DIR * ahDir )

Resets directory listing pointer to beginning of list for a valid FAT_DIR entry as initalized by FAT_opendir.

Parameters:

[in] ahDir Pointer to a valid FAT_DIR from FAT_opendir

Returns:: FATFS_OK (0) on success, negative number upon failure.

Classes

Macros

Typedefs

Functions

Detailed Description

Macro Definition Documentation

Typedef Documentation

Function Documentation