CCS FAT driver bugfix!

[andrewg]

(See also CCS SD/MMC driver MBR support)

The CCS "fat.c" functions "get_next_addr" and "get_prev_addr" do not correctly handle cluster transitions. The following are corrected functions:

[andrewg]

Another one, "get_short_file_name" is also buggy. Fix:

[BugVito]

Good stuff andrewg. This got me going until I formatted the sd card. It has seen a fair amount of trial and error and procedures before it finally worked, and this was all before applying your changes.

Could you explain exactly what is needed for the sd card to work on both a pc and on a board using ccs mmcsd and fat drivers, or simply what format type, etc...?

I have tried formatting as FAT32 with default settings, no luck, FAT32 with 512 size blocks, still no luck, completely wiped the card using a hex editor, then format with both options above, still no luck.

It is unfortunate that ccs would deploy a crippled/incomplete driver without maintaining it. I've had an ethernet board from ccs for a while, with close to no luck at using the sd card.

[andrewg]

I've only ever used cards formatted on my PC or in a camera. All my standard SD (not SHDC) cards work fine. After I made my changes (cluster fix and MBR enhancement) the cards have just worked.

I have to admit, though, that so far I've only ever had the PIC read a card (I've only used it for firmware updating, so far). Writing is coming soon. Once I've done some writing and made sure it actually works (I don't see why it won't, since reading works fine), then I'm going to write to CCS and give them my new code.

When using the CCS code, make sure you've compiled it for the correct FAT16/32 variant for the cards you're using (probably FAT32).

Also, so far I've implemented SD cards on pure 3.3V logic, so no 5V <--> 3.3V level translations complicate things. I've also made sure I have pullup resistors on both the CS and MISO (data from card to PIC) lines.
_________________
Andrew

[BugVito]

Ahh read only. This is good to know, and may be sufficient for now actually.

My test starts by writting a file, appending text to it, and then reading from it. I'll chop those first bits off for now, and test a few different formats.

Everything was working, read and write, using the ex_fat.c example and your fixed code. That is before formatting the card. So a fix may not be that far off.

I seem to be using the same setup, FAT32, 3.3V, and pullup resistors.

Thanks for the info and initiative! Most appreciated!

[KONAMI]

Did it(CCS C FAT.C bugfix) work in FAT32 file system.

[quangtk87]

When I repair fat.c and mmcsd.c on ccs follow Andrewg. Every command is good, but it just working on my Hyperterminal. Plug SD card in my PC is nothing, empty. Anybody help me! plz
_________________
tinhquang

[opas]

I tried to use CCS lib to make a data logger. I found a lot of bugs in the lib and need much time to modify it. At last I can make file with text in the card and can read it in Windows. Only one thing I can not fix it : when I put data in cluster 2, Notepad show errors. If someone know the solution, please let me know

Next is the lib code

mmcsd.c

[opas]

I do errors, now my code again

Fact.c

[code:1:9ea10b2720]/////////////////////////////////////////////////////////////////////////
//// FAT_PIC.C ////
//// ////
//// Driver/Library for a FAT filesystem with a PIC ////
//// ////
//// This Library was designed to resemble standard ANSI C I/O as ////
//// much as possible. There are, however, some caveats to this. ////
//// Please read the comments to make sure the inputs and outputs ////
//// to each function are understood before using anything in ////
//// this library. ////
//// ////
//// This library supports FAT16 and FAT32, but not both at the same ////
//// time (this is a compile option, see options below). It is ////
//// recommended to use FAT32, FAT32 also has been tested more. ////
//// ////
//// Any function with an argument taking in a file name must be in ////
//// the form of... ////
//// "/filename.fil" for a file in the root directory ////
//// "/Directory/filename.fil" for a file in a subdirectory of root ////
//// "/Directory/Subdirectory/filename.fil" and so on... ////
//// ////
//// Any function with an argument taking in a directory name must ////
//// be in the form of... ////
//// "/Dirname/" for a directory in the root directory ////
//// "/Dirname/Subdirname/" for a directory in a subdirectory of ////
//// root and so on... ////
//// ////
//// A compatable media library must be provided. This is ////
//// documented after the User Functions. ////
//// ////
//// -- User Functions -- ////
//// ////
//// fat_init() ////
//// Initializes the FAT library, also initializes the media. ////
//// ////
//// fatopen(char *name, char *mode, FILE *fstream) ////
//// Opens up a FILE stream to a specified file with the specified ////
//// permission mode: ////
//// Permissions: "r" = read ////
//// "w" = write ////
//// "a" = append ////
//// "rb" = read binarily ////
//// "w" will erase all of the data in the file upon ////
//// the opening of the file. ////
//// "a" will tack on all of the data to the end of the ////
//// file. ////
//// "r" will keep on reading until the stream ////
//// hits an '\0' ////
//// "rb" will keep on reading until the amount of ////
//// bytes read equals the size of the file. ////
//// ////
//// Unlike standard C fopen(), this does not malloc a FILE - ////
//// instead the caller will have to have allready allocated a ////
//// a FILE and pass a pointer to it. ////
//// ////
//// fatreopen(char *name, char *mode, FILE *fstream) ////
//// Closes a FILE stream, then reopens the stream with a new file ////
//// and new permissions. ////
//// ////
//// fatclose(FILE *fstream) ////
//// Closes a FILE stream. It is very important to call this ////
//// function when you're done reading or writing to a file. //// ////
//// ////
//// fatgetc(FILE *fstream) ////
//// Gets a character from a stream. An EOF will be returned at ////
//// different times depending on whether or not the stream is ////
//// reading binarily. If not reading binarily: EOF when the ////
//// stream reads a '\0'. If reading binarily: EOF when the amount ////
//// of bytes read equals the size of the file (end of file). ////
//// ////
//// fatputc(char c, FILE *fstream) ////
//// Puts a character into a stream (write to the file). ////
//// Writes are buffered, so the media may not be written to until ////
//// a fatclose(). ////
//// ////
//// char* fatgets(char* str, int num, FILE *fstream) ////
//// Gets characters from a stream until either a '\r', EOF, or ////
//// num - 1 is hit. ////
//// ////
//// fatputs(char* str, FILE *fstream) ////
//// Puts a string into a stream (write a string to the file). ////
//// ////
//// fatprintf(FILE *stream): Printfs the entire stream. ////
//// printf()'s the entire stream (printf()'s the contents of the
//// file).
//// ////
//// fatgetpos(FILE *fstream, fatpos_t *pos) ////
//// Gets the current position of the stream/file, saves to pos. ////
//// ////
//// fatsetpos(FILE *fstream, fatpos_t *pos) ////
//// Sets the current position of the stream/file. ////
//// ////
//// fatseek(FILE *fstream, int32 offset, int origin) ////
//// Sets the current position of the stream according to the ////
//// origin parameter: ////
//// SEEK_CUR: Set position relative to the ////
//// current stream position. ////
//// SEEK_END: Set position relative to the ////
//// end of the stream. ////
//// SEEK_SET: Set position relative to the ////
//// beginning of the stream. ////
//// ////
//// fateof(FILE *fstream) ////
//// Returns non-zero if the stream/file position is at EOF, ////
//// non-zero if there are still data left in the stream. ////
//// ////
//// faterror(FILE *fstream): ////
//// Returns non-zero if there have been errors with the stream, ////
//// zero if the stream has been operating correctly since it has ////
//// been opened. ////
//// ////
//// fatread(void* buffer, int size, int32 num, FILE* fstream) ////
//// Reads size*num chars from the stream, saves to buffer. ////
//// ////
//// fatwrite(void* buffer, int size, int32 num, FILE* fstream) ////
//// Writes size*num chars from buffer to the stream. ////
//// ////
//// fatflush(FILE *fstream) ////
//// Flushes the buffer in a stream. ////
//// ////
//// clearerr(FILE *fstream) ////
//// Clears any error flags in the stream. ////
//// ////
//// rewind(FILE *fstream) ////
//// Send the stream back to the beginning of the file. ////
//// ////
//// fatpos_t fattell(FILE *fstream) ////
//// Returns the current position of the stream. ////
//// ////
//// rm_file(char *fname) ////
//// Removes a file. ////
//// ////
//// rm_dir(char *dirname) ////
//// Removes a directory. ////
//// ////
//// mk_file(char *fname) ////
//// Makes a file, file will be blank. ////
//// ////
//// mk_dir(char *dirname) ////
//// Makes a directory. ////
//// ////
//// format(int32 mediaSize) ////
//// Formats the media into a FAT32 or FAT16 file system. ////
//// If you specify a mediaSize larger than the actual media bad ////
//// things will happen. If you specify a mediaSize smaller than ////
//// the actual media size will simply limit the filesystem from ////
//// using 0 to mediaSize-1. Anything after mediaSize can be used ////
//// by the application (perhaps as a general purpose EEPROM?) ////
//// NOTE: Windows thinks the filesystem is RAW. ////
//// NOTE: This may be a little buggy. ////
//// ////
/////////////////////////////////////////////////////////////////////////
//// ////
//// This library was written to use CCS's MMC/SD library as the ////
//// media source. If you want to use a different media source, ////
//// you must provide the following 4 functions: ////
//// ////
//// int8 mmcsd_init(void); ////
//// Initializes the media. This will be called by fat_init(). ////
//// ////
//// int8 mmcsd_read_bytes(int32 a, int16 s, char *p); ////
//// Read s bytes from p to the media starting at address a. ////
//// ////
//// int8 mmcsd_write_data(int32 a, int16 s, char *p); ////
//// Write s bytes from p to the media starting at address a. ////
//// To maximize throughput on some medias, it's a good idea to ////
//// buffer writes in this function. ////
//// ////
//// int8 mmcsd_flush_buffer(void); ////
//// If your write function is buffering writes, this will flush ////
//// the buffer and write it to the media. ////
//// ////
//// All four functions should return 0 if OK, non-zero if error. ////
//// ////
/////////////////////////////////////////////////////////////////////////
//// (C) Copyright 2007 Custom Computer Services ////
//// This source code may only be used by licensed users of the CCS ////
//// C compiler. This source code may only be distributed to other ////
//// licensed users of the CCS C compiler. No other use, ////
//// reproduction or distribution is permitted without written ////
//// permission. Derivative programs created using this software ////
//// in object code form are not restricted in any way. ////
/////////////////////////////////////////////////////////////////////////

// NOTE This library has no concept of what time and date it currently is.
// All files and folders created or modified using this library
// will have invalid/inaccurate timestamps and datestamps.

// NOTE To save on ROM and RAM space, the user of this library will have to
// define what type of FAT they will be working with. The defines are
// in the Useful Defines section below.

// NOTE For faster writing or appending for an application such as a logger,
// uncomment #FAST_FAT below. This will make the FAT library assume
// there is one file on the card to write or append to, thereby
// making writing and appending much faster. Reading is impossible in
// this mode.
// THIS IS NOT TESTED VERY WELL YET!

// NOTE The current maximum file name length (full path) is 32 characters
// long. If longer file names are desired, change the
// MAX_FILE_NAME_LENGTH define below. Creating a file whose full path
// is longer than MAX_FILE_NAME_LENGTH may lead to weird operation. Keep
// in mind that making this define larger will make your RAM usage go
// up.

#ifndef FAT_PIC_C
#define FAT_PIC_C

#include <ctype.h>
#include <string.h>
#case

//////////////////////
/// ///
/// Useful Defines ///
/// ///
//////////////////////

/// Define your FAT type here ///
#define FAT16
//#define FAT32

/// For faster single-file writing, uncomment this line below ///
//#define FAST_FAT

/// Everything else ///
#define MAX_FILE_NAME_LENGTH 0x20 // the maximum length of a file name for our FAT, including /0 terminator
#define STREAM_BUF_SIZE 0x20 // how big the FILE buffer is. 0x20 is optimal

//////////////////////////////////////////////////////////////////

#define EOF -1
#define GOODEC 0
#define fatpos_t int32
#define SEEK_CUR 0
#define SEEK_END 1
#define SEEK_SET 2

////////////////////////
/// ///
/// Global Variables ///
/// ///
////////////////////////

unsigned int16
Bytes_Per_Cluster, // number of addressable bytes per cluster
FAT_Start; // when the first FAT begins

unsigned int32
Data_Start, // when data starts
FAT_Length, // the length of one FAT
Next_Free_Clust, // where the next free cluster is
Root_Dir; // when the root directory starts

enum filetype
{
Data_File, // the stream is pointing to a binary, data file
Directory, // the stream is pointing to a directory
None // the stream isn't currently pointing to anything
};

enum ioflags
{
Closed = 0x00,
Read = 0x01,
Write = 0x02,
Append = 0x04,
Binary = 0x08,
EOF_Reached = 0x10,
Read_Error = 0x20,
Write_Error = 0x40,
File_Not_Found = 0x80
};

struct iobuf
{
fatpos_t
Bytes_Until_EOF, // how many bytes until the stream's end of file
Cur_Char, // the current byte that the stream is pointing at
Entry_Addr, // the entry address of the file that is associated with the stream
Parent_Start_Addr, // the parent's start adddress of the file that is associated with the stream
Size, // the size of the file that is associated with the stream
Start_Addr; // the beginning of the data in the file that is associated with the stream

enum filetype File_Type; // the type of file that is associated with the stream

enum ioflags Flags; // any associated input/output flag

int Buf[STREAM_BUF_SIZE]; // this is a buffer so that during fatputc() or fatgetc()
// the media won't have to be read at every character
};
typedef struct iobuf FILE;

///////////////////////////
/// ///
/// Function Prototypes ///
/// ///
///////////////////////////

/// Standard C Functions ///
signed int fatopen(char fname[], char mode[], FILE* stream);
signed int fatreopen(char fname[], char mode[], FILE* stream);
signed int fatclose(FILE* stream);
signed int fatgetc(FILE* stream);
signed int fatputc(int ch, FILE* stream);
char* fatgets(char* str, int num, FILE* stream);
signed int fatputs(char* str, FILE* stream);
signed int fatprintf(FILE* stream);
signed int fatgetpos(FILE* stream, fatpos_t* position);
signed int fatsetpos(FILE* stream, fatpos_t* position);
signed int fatseek(FILE* stream, int32 offset, int origin);
signed int fateof(FILE* stream);
signed int faterror(FILE* stream);
signed int fatread(void* buffer, int size, int32 num, FILE* stream);
signed int fatwrite(void* buffer, int size, int32 count, FILE* stream );
signed int fatflush(FILE* stream);
signed int remove(char* fname);
void clearerr(FILE* stream);
void rewind(FILE* stream);
fatpos_t fattell(FILE* stream);

/// Non-Standard C Functions ///
signed int rm_file(char fname[]);
signed int rm_dir(char dname[]);
signed int mk_file(char fname[]);
signed int mk_dir(char dname[]);

/// Functions' Utility Functions ///
signed int set_file(char fname[], int attrib, FILE* stream);
signed int get_file_name(int32 file_entry_addr, char name[]);
signed int set_file_name(int32 parent_dir_addr, int32* entry_addr, char name[]);
signed int get_short_file_name(int32 file_entry_addr, char sname[], int type);
signed int make_short_file_name(int32 parent_dir_addr, char fname[], char sname[]);
int long_name_chksum (int* pFcbName);
signed int check_invalid_char(char fname[]);
#ifdef FAT32
signed int get_next_free_cluster(int32* my_cluster);
signed int dealloc_clusters(int32 start_cluster);
signed int alloc_clusters(int32 start_cluster, int32* new_cluster_addr);
signed int clear_cluster(int32 cluster);
signed int write_fat(int32 cluster, int32 data);
#else // FAT16
signed int get_next_free_cluster(int16* my_cluster);
signed int dealloc_clusters(int16 start_cluster);
signed int alloc_clusters(int16 start_cluster, int32* new_cluster_addr);
signed int clear_cluster(int16 cluster);
signed int write_fat(int16 cluster, int16 data);
#endif // #ifdef FAT32
signed int get_next_file(FILE* stream);
signed int get_prev_file(FILE* stream);
signed int get_next_free_addr(int32* my_addr);
signed int get_next_free_entry(int32* start_addr);
signed int get_next_entry(int32* start_addr);
signed int get_prev_entry(int32* start_addr);
signed int read_buffer(FILE* stream, int* val);
signed int write_buffer(FILE* stream, int val);
void fill_entry(char the_entry[], char val, int8 start_ind);
void disp_timestamp(int16 timestamp);
void disp_datestamp(int16 datestamp);

/// Data Utility Functions ///
signed int fat_init();
#ifdef FAT32
signed int get_next_cluster(int32* my_cluster);
signed int get_prev_cluster(int32* my_cluster);
int32 cluster_to_addr(int32 cluster);
int32 addr_to_cluster(int32 addr);
#else // FAT16
signed int get_next_cluster(int16* my_cluster);
signed int get_prev_cluster(int16* my_cluster);
int32 cluster_to_addr(int16 cluster);
int16 addr_to_cluster(int32 addr);
#endif // #ifdef FAT32
signed int get_next_addr(int32* my_addr);
signed int get_prev_addr(int32* my_addr);
signed int format(int32 DskSize);

/// Debugging Utility Functions ///
signed int disp_folder_contents(char foldername[]);
signed int dump_addr(int32 from, int32 to);
signed int dump_clusters(int32 from, int32 to);
void disp_fat_stats();
signed int fatprintfinfo(FILE* stream);

////////////////////////////////
/// ///
/// Function Implementations ///
/// ///
////////////////////////////////

/// Standard C Functions ///

/*
signed int fatopen(char fname[], char mode[], FILE* stream)
Summary: This will open up a file stream for reading, writing, or appending.
Param fname: The full path of the file to open.
Param mode: The mode to open up the stream into.
"r" = Read
"w" = Write
"a" = Append
"rb", "wb", "ab" = Read, Write, or Append in Binary mode
Param stream: The stream to open up.
Returns: EOF if there was a problem, GOODEC if everything went okay.
Note: fname must be in the form of /filename.fil for a file in the root directory
/Directory/filename.fil for a file in a subdirectory of root
/Directory/Subdirectory/filename.fil and so on...
Note: Standard C will make a file in case a file isn't found,
however due to recursion this is not possible in CCSC.
*/
signed int fatopen(char fname[], char mode[], FILE* stream)
{
int fname_parse_pos = 1; // the current index of the fname character

char target_file[MAX_FILE_NAME_LENGTH]; // temporary buffer to hold names of files

FILE cur_stream; // this will be the stream that will be returned if all goes well

#ifndef FAST_FAT
int
depth = 0, // how many subdirectories deep the file is
target_file_parse_pos; // the current index of the target_file character
#endif // #ifndef FAST_FAT

// set flags
#ifdef FAST_FAT
switch(mode[0])
{
case 'w':
cur_stream.Flags = Write;
break;
case 'a':
cur_stream.Flags = Append;
break;
default:
return EOF;
}

// start looking for the file, start at root
cur_stream.Start_Addr = cur_stream.Parent_Start_Addr = Root_Dir;

while(fname[fname_parse_pos] != '\0')
{
target_file[fname_parse_pos - 1] = fname[fname_parse_pos];
fname_parse_pos += 1;
}

target_file[fname_parse_pos] = '\0';

// find the file inside of its subdirectory
if(set_file(target_file, 0x20, &cur_stream) != GOODEC)
{
cur_stream.Flags |= File_Not_Found;
*stream = cur_stream;
return EOF;
}

// at this point, we've found the file
*stream = cur_stream;
return GOODEC;
#else // NO FAST_FAT
switch(mode[0])
{
case 'r':
cur_stream.Flags = Read;
break;
case 'w':
cur_stream.Flags = Write;
break;
case 'a':
cur_stream.Flags = Append;
break;
default:
return EOF;
}

if(mode[1] == 'b')
cur_stream.Flags |= Binary;

// start looking for the file, start at root
cur_stream.Start_Addr = cur_stream.Parent_Start_Addr = Root_Dir;
//printf("fatopen:cur_stream.Start_Addr--> %lX \n\r", cur_stream.Start_Addr);
// figure out how deep we have to go, count how many '/' we have in the string
while(fname[fname_parse_pos] != '\0')
{
if(fname[fname_parse_pos] == '/')
depth++;
fname_parse_pos += 1;
}

// start the fname index at 1 to skip over the '/'
fname_parse_pos = 1;

// open up to the subdirectory, if possible
while(depth > 0)
{
// find the name of our next target directory
target_file_parse_pos = 0;
while(fname[fname_parse_pos] != '/')
{
// check to make sure that we're not at the end of a poorly formatted string
if(fname[fname_parse_pos] == '\0')
return EOF;

// fill up the buffer and increment the indexes
target_file[target_file_parse_pos] = fname[fname_parse_pos];
fname_parse_pos += 1;
target_file_parse_pos += 1;
}

// increment the fname index one more because it's currently pointing at the '/'
fname_parse_pos += 1;

// tack on a \0 to the end of the target file to terminate the string
target_file[target_file_parse_pos] = '\0';
// printf("SET FILE\n\r") ;

// check to see if the directory exists and open it if possible, otherwise exit because the directory doesn't exist
if(set_file(target_file, 0x10, &cur_stream) != GOODEC)
{
cur_stream.Flags |= File_Not_Found;
*stream = cur_stream;
return EOF;
}
depth -= 1;
}

// check to see if we're trying to open just a directory
if(fname[fname_parse_pos] == '\0')
{
*stream = cur_stream;
return GOODEC;
}

// now that we have the location of the subdirectory that the file is in, attempt to open the file
target_file_parse_pos = 0;
while(fname[fname_parse_pos] != '\0')
{
// fill up the buffer and increment the indexes
target_file[target_file_parse_pos] = fname[fname_parse_pos];
fname_parse_pos += 1;
target_file_parse_pos += 1;
}

// tack on a \0 to the end of the target file to terminate the string
target_file[target_file_parse_pos] = '\0';

//printf("target file : %s \n\r",target_file) ;

// find the file inside of its subdirectory
if(set_file(target_file, 0x20, &cur_stream) != GOODEC)
{
cur_stream.Flags |= File_Not_Found;
*stream = cur_stream;
return EOF;
}

// at this point, we've found the file
*stream = cur_stream;
return GOODEC;
#endif // #ifdef FAST_FAT
}

/*
signed int fatreopen(char fname[], char mode[], FILE* old_stream, FILE* new_stream)
Summary: This will close a stream and then reopen it using new parameters.
Param fname: The full path of the file to open.
Param mode: The mode to open up the stream into.
"r" = Read
"w" = Write
"a" = Append
"rb", "wb", "ab" = Read, Write, or Append in Binary mode
Param stream: The stream to close and reopen.
Returns: EOF if there was a problem, GOODEC if everything went okay.
Note: fname must be in the form of /filename.fil for a file in the root directory
/Directory/filename.fil for a file in a subdirectory of root
/Directory/Subdirectory/filename.fil and so on...
Note: Standard C will make a file in case a file isn't found,
however due to recursion this is not possible in CCSC.
*/
signed int fatreopen(char fname[], char mode[], FILE* stream)
{
// close the old stream
if(fatclose(stream) == EOF)
return EOF;

// open the new stream
if(fatopen(fname, mode, stream) == EOF)
return EOF;

return GOODEC;
}

/*
signed int fatclose(FILE* stream)
Summary: Closes a stream and commits any changes done to the file.
Param: The stream to close.
Returns: EOF if there was a problem, 0 if everything went okay.
*/
signed int fatclose(FILE* stream)
{
int ec = 0;
int value,address;
int32 first_cluster;

//for(address= 0 ; address <= 0x20 ; address++)
// while (value != 'R')
// { mmcsd_read_data(stream->Entry_Addr + address, 1, &value);

// printf(" fatclose: stream->Entry_Addr --> %lX , HexVal --> %X, AsciiVal--> %c\n\r", stream->Entry_Addr+address, value, value) ;

// }

// commit data back to the stream's entry, if needed
if((stream->Flags & Write) || (stream->Flags & Append))
{
// write the new size of the file
if(mmcsd_write_data(stream->Entry_Addr + 0x1C, 4, &(stream->Size)) != GOODEC)
{
// printf(" fatclose: stream->Entry_Addr --> %lX , stream->Size --> %lX\n\r", stream->Entry_Addr+0x1c, stream->Size) ;

stream->Flags |= Write_Error;
return EOF;
}

// check to see if the first cluster is already linked in the file
ec += mmcsd_read_data(stream->Entry_Addr + 0x14, 2, (int16*)&first_cluster + 1);
ec += mmcsd_read_data(stream->Entry_Addr + 0x1A, 2, &first_cluster);

//printf(" fatclose: stream->Entry_Addr+0x14 --> %lX , first_cluster + 1 --> %lX\n\r", stream->Entry_Addr+0x14, first_cluster + 1) ;
//printf(" fatclose: stream->Entry_Addr+0x1A --> %lX , first_cluster --> %lX\n\r", stream->Entry_Addr+0x1A, first_cluster) ;

if(ec != GOODEC)
{
stream->Flags |= Read_Error;
return EOF;
}

// write the first cluster to the entry if needed
if(first_cluster == 0)
{
// convert the start address to a cluster number
first_cluster = addr_to_cluster(stream->Start_Addr);

ec += mmcsd_write_data(stream->Entry_Addr + 0x14, 2, (int16*)&first_cluster + 1);
ec += mmcsd_write_data(stream->Entry_Addr + 0x1A, 2, &first_cluster);

if(ec != GOODEC)
{
stream->Flags |= Write_Error;
return EOF;
}
}

// dump the remaining buffer to the card
if(fatflush(stream) == EOF)
return EOF;
}
// nullify the data
stream->Cur_Char = 0;
stream->Entry_Addr = 0;
stream->Size = 0;
stream->Start_Addr = 0;
stream->Flags = 0;
return 0;
}

/*
signed int fatgetc(FILE* stream)
Summary: Gets a character from a stream.
Param: The stream to get a character from.
Returns: The character that was gotten from the stream,
EOF if the stream has reached the end of the file or doesn't have permissions to read,
*/
signed int fatgetc(FILE* stream)
{
char ch; // character read in

// check to see if the stream has proper permissions to read
if(stream->Flags & Read)
{
// when the number of bytes until eof hit zero, we know we are at the end of any file
if(stream->Bytes_Until_EOF == 0)
{
stream->Flags |= EOF_Reached;
return EOF;
}

// read in the next byte in the buffer
if(read_buffer(stream, &ch) == EOF)
return EOF;

// a 0x00 will signify the end of a non-binary file
if((ch == '\0') && !(stream->Flags & Binary))
{
stream->Flags |= EOF_Reached;
return EOF;
}

// get the next contiguous address of the stream
if(get_next_addr(&(stream->Cur_Char)) != GOODEC)
return EOF;

// we just got 1 byte closer to the end of the file
stream->Bytes_Until_EOF -= 1;
return ch;
}

// if the stream doesn't have proper permissions to read, return an EOF
else
return EOF;
}

/*
signed int fatputc(int ch, FILE* stream)
Summary: Puts a character into a stream.
Param ch: The character to put into the stream.
Param stream: The stream to put a character into.
Returns: The character that was put into the stream,
EOF if the stream doesn't have permissions to write, or if a problem happened.
*/
signed int fatputc(int ch, FILE* stream)
{
// check to see if the stream has proper permissions to write
if(((stream->Flags & Write) || (stream->Flags & Append)) && (stream->File_Type == Data_File))
{ //printf("\r\n Cur_Char = %lX ; Data_Start : %lX",stream->Cur_Char, Data_Start);
// if there isn't any space allocated yet, allocate some
if(stream->Cur_Char < Data_Start)
{ // printf("\r\n Get new cluster : ");
// printf("\r\n next free cluster = %X\r\n",Next_Free_Clust);

if(get_next_free_cluster(&Next_Free_Clust) == EOF)
return EOF;
// printf("Next_Free_Clust %X",Next_Free_Clust);

#ifdef FAT32
if(write_fat(Next_Free_Clust, 0x0FFFFFFF) == EOF)
return EOF;
#else // FAT16
if(write_fat(Next_Free_Clust, 0xFFFF) == EOF)
return EOF;
#endif // #ifdef FAT32
if(clear_cluster(Next_Free_Clust) == EOF)
return EOF;
stream->Cur_Char = stream->Start_Addr = cluster_to_addr(Next_Free_Clust);
}

// write the next character to the buffer
if(write_buffer(stream, ch) == EOF)
return EOF;

// get the next address, increment Cur_Char
if(get_next_addr(&(stream->Cur_Char)) == EOF)
{
// write the current buffer to the end of the current cluster
if(mmcsd_write_data(stream->Cur_Char - STREAM_BUF_SIZE + 1, STREAM_BUF_SIZE, stream->Buf) != GOODEC)
{
stream->Flags |= Write_Error;
return EOF;
}
// start looking for a new cluster to allocate
if(alloc_clusters(addr_to_cluster(stream->Cur_Char), &(stream->Cur_Char)) == EOF)
return EOF;
}

// our file just got bigger by 1 byte
stream->Size += 1;

return ch;
}

// if the stream doesn't have proper permissions to write, return an EOF
else
return EOF;
}

/*
char* fatgets(char* str, int num, FILE* stream)
Summary: Reads characters from a stream into a string.
Param str: A pointer to the beginning of the string to put characters into.
Param num: The number of characters to put into the string - 1.
Param stream: The stream to read from.
Returns: A pointer to the most recently added character, or NULL if there was an error.
Note: If a newline is read from the stream, then str will be terminated with a newline.
If num - 1 or EOF is reached, then str will be null terminated.
*/
char* fatgets(char* str, int num, FILE* stream)
{
int i; // counter for loops

// loop until num - 1
for(i = 0; i < num - 1; i += 1)
{
str[i] = fatgetc(stream);
if(str[i] == '\n')
return str;
if(str[i] == EOF)
break;
}

// close off str with a null terminator
str[i] = '\0';

return str;
}

/*
signed int fatputs(char* str, FILE* stream)
Summary: Writes characters from a string into a stream.
Param str: A pointer to the beginning of the string to write into the stream.
Param stream: The stream to write into.
Returns: EOF if there was a problem, GOODEC if everything went okay.
*/
signed int fatputs(char* str, FILE* stream)
{
int i = 0; // counter for loops

// fatputc every character in the stream
while(str[i] != '\0')
{
if(fatputc(str[i], stream) == EOF)
return EOF;
i += 1;
// printf("fatputs : %c : %X \r\n", str[i],str[i]);
}

return GOODEC;
}

/*
signed int fatprintf(FILE* stream)
Summary: This will print off the entire contents of the stream to the console.
Param: The stream to print off.
Returns: The last character printed off to the console.
*/
signed int fatprintf(FILE* stream)
{
signed int ch; // character read in

// keep on printf any characters read in as long as we don't run into an end of file or a media error
do
{
ch = fatgetc(stream);
printf("%c", ch);
} while(ch != EOF);

return ch;
}

/*
signed int fatgetpos(FILE* stream, fatpos_t* position)
Summary: Returns the current position of where the stream is pointing to relative to the beginning of the stream.
Param stream: The stream to get the position of.
Param position: A pointer to a variable put the current position of the pointer into.
Returns: 0 on success.
*/
signed int fatgetpos(FILE* stream, fatpos_t* position)
{
*position = stream->Size - stream->Bytes_Until_EOF;
return 0;
}

/*
signed int fatsetpos(FILE* stream, fatpos_t* position)
Summary: Sets the current position of where the stream is pointing to in memory relative to the beginning of the stream.
Param stream: The stream to set the position of.
Param position: A pointer the a variable that has the value of the new position.
Returns: 0 on success, or EOF if there was error.
*/
signed int fatsetpos(FILE* stream, fatpos_t* position)
{
#ifndef FAST_FAT
#ifdef FAT32
int32 cur_cluster; // the current cluster we're pointing to
#else // FAT16
int16 cur_cluster; // the current cluster we're pointing to
#endif // #ifdef FAT32
int32 i; // pointer to memory
#endif // #ifndef FAST_FAT

// check to see if we want to just rewind the file
if(*position == 0)
{
rewind(stream);
return GOODEC;
}

// this whole process is much different and easier if we're writing or appending at a spot after EOF
// this will essentially write null characters to the file from EOF to the desired position
if(((stream->Flags & Write) || (stream->Flags & Append)) && (stream->Size < *position))
{
while(stream->Size < *position)
if(fatputc('\0', stream) == EOF)
return EOF;

return 0;
}

#ifdef FAST_FAT
stream->Cur_Char = stream->Start_Addr + *position;
#else // NO FAST_FAT
// figure out how many clusters into the file the position is to be set to
i = *position / Bytes_Per_Cluster;
cur_cluster = addr_to_cluster(stream->Start_Addr);

// head to that cluster
while(i > 0)
{
if(get_next_cluster(&cur_cluster) != GOODEC)
return EOF;
i -= 1;
}

// head to the correct cluster
stream->Cur_Char = cluster_to_addr(cur_cluster);

// now that we're in the correct cluster, tack on the remaining position
stream->Cur_Char += (*position % Bytes_Per_Cluster);

if(stream->Flags & Read)
{
// we now need to change how far it is until EOF
stream->Bytes_Until_EOF = stream->Size - *position;

// fill up the buffer
if(mmcsd_read_data(stream->Cur_Char, STREAM_BUF_SIZE, stream->Buf) != GOODEC)
{
stream->Flags |= Read_Error;
return EOF;
}
}

else
stream->Size = *position;
#endif // #ifdef FAST_FAT
return 0;
}

/*
signed int fatseek(FILE* stream, int32 offset, int origin)
Summary: This will set the position of the file stream according to the input. The EOF flag will also be cleared.
Param stream: The stream to set the position of.
Param offset: How many bytes relative of origin the file stream position will be set.
Param origin: This will be one of 3 values...
SEEK_CUR: Set position relative to the current stream position.
SEEK_END: Set position relative to the end of the stream.
SEEK_SET: Set position relative to the beginning of the stream.
Returns: 0 on success, or EOF if there was error.
*/
signed int fatseek(FILE* stream, int32 offset, int origin)
{
int32 myoffset; // since fatsetpos requires a pointer to a variable, we need this here

switch(origin)
{
case SEEK_CUR:
myoffset = stream->Cur_Char + offset;
if(fatsetpos(stream, &myoffset) != 0)
return EOF;
break;
case SEEK_END:
myoffset = stream->Size - offset;
if(fatsetpos(stream, &myoffset) != 0)
return EOF;
break;
case SEEK_SET:
myoffset = offset;
if(fatsetpos(stream, &myoffset) != 0)
return EOF;
break;
default:
return EOF;
}

// clear the EOF flag
stream->Flags &= 0xEF;

return GOODEC;
}

/*
signed int fateof(FILE* stream)
Summary: Determines whether or not the stream is at the end of the file.
Param: The stream to query for EOF.
Returns: A non-zero value if the file is at EOF,
0 if the file is not at EOF.
*/
signed int fateof(FILE* stream)
{
return stream->Flags & EOF_Reached;
}

/*
signed int fatread(void* buffer, int size, int32 num, FILE* stream)
Summary: Fills up an array with data from a stream.
Param buffer: A pointer to the beginning of an array of any type.
Param size: How many bytes each element in the array is.
Param num: How many elements to fill in the array.
Param stream: The stream to read from.
Returns: How many values were written to the array.
*/
signed int fatread(void* buffer, int size, int32 num, FILE* stream)
{
int32 i; // counter for loop

// fill up every byte
for(i = 0; i < (num * size); i += 1)
buffer[i] = fatgetc(stream);

return i;
}

/*
signed int fatwrite(void* buffer, int size, int32 count, FILE* stream )
Summary: Fills up a stream with data from an array
Param buffer: A pointer to the beginning of an array of any type.
Param size: How many bytes each element in the array is.
Param num: How many elements to write to the stream.
Param stream: The stream to write to.
Returns: How many values were written to the stream.
*/
signed int fatwrite(void* buffer, int size, int32 count, FILE* stream )
{
int32 i; // counter for loop

// write every byte
for(i = 0; i < (count * (int32)size); i += 1)
if(fatputc(buffer[i], stream) == EOF)
return EOF;

return i;
}

/*
signed int fatflush(FILE* stream)
Summary: Flushes the buffer of a given stream.
Param: The stream to flush the buffer of.
Returns: EOF if there was a problem, 0 if everything went okay
*/
signed int fatflush(FILE* stream)
{ int address;
// check to see if we have a buffer
if((stream->Flags & Write) || (stream->Flags & Append))
{
// for( address =0; address <= STREAM_BUF_SIZE; address++)
// { printf ("stream->Cur_Char : %lX, %c\r\n",stream->Cur_Char-address,stream->Buf[address] );}
// { printf (" %X", stream->Buf[address] );}


// check to see if we need to flush the buffer
if(stream->Cur_Char % STREAM_BUF_SIZE == 0)
{
// flush the buffer to the card
if(mmcsd_write_data(stream->Cur_Char - STREAM_BUF_SIZE, STREAM_BUF_SIZE, stream->Buf) != GOODEC)
{
stream->Flags |= Write_Error;
return EOF;
}
}
else
{
// flush the buffer to the card
// we need to make sure that the buffer gets flushed into the proper location, hence all this weird % math
if(mmcsd_write_data(stream->Cur_Char - (stream->Cur_Char % STREAM_BUF_SIZE), STREAM_BUF_SIZE, stream->Buf) != GOODEC)
{
stream->Flags |= Write_Error;
return EOF;
}
}
return(mmcsd_flush_buffer());
}
return 0;
}

/*
signed int remove(char* fname)
Summary: Removes a file from disk.
Param: The full path of the file to remove.
Returns: 0 on success, or EOF if there was error.
Note: This function does not work for removing directories, use rm_dir instead.
Note: fname must be in the form of /filename.fil for a file in the root directory
/Directory/filename.fil for a file in a subdirectory of root
/Directory/Subdirectory/filename.fil and so on...
*/
signed int remove(char* fname)
{
if(rm_file(fname) == EOF)
return EOF;

return 0;
}

/*
signed int faterror(FILE* stream)
Summary: Checks for an error in a given stream.
Param: The stream to check for an error in.
Returns: A non-zero value of there is an error in the stream,
0 if there is no error in the stream
*/
signed int faterror(FILE* stream)
{
return stream->Flags & 0xF0;
}

/*
void clearerr(FILE* stream)
Summary: Clears off all error in a given stream.
Param: The stream to clear off the errors in.
Returns: Nothing.
*/
void clearerr(FILE* stream)
{
stream->Flags &= 0x0F;
}

/*
void rewind(FILE* stream)
Summary: Sets the stream to point back to the beginning of a file.
Param: The stream to rewind.
Returns: Nothing.
*/
void rewind(FILE* stream)
{
// set the stream back to the beginning
stream->Cur_Char = stream->Start_Addr;
stream->Bytes_Until_EOF = stream->Size;
}

/*
fatpos_t fattell(FILE* stream)
Summary: Returns the current position of where the stream is pointing to relative to the beginning of the stream.
Param: The stream to return the position of.
Returns: The position of where the stream is pointing to relative to the beginning of the stream, or 0 if there was a problem.
*/
fatpos_t fattell(FILE* stream)
{
fatpos_t retval;

if(fatgetpos(stream, &retval) != 0)
return 0;

return retval;
}

/// Non-Standard C Functions ///

/*
signed int rm_file(char fname[])
Summary: Deletes a file.
Param: The full path of the file to delete.
Returns: GOODEC if everything went okay, EOF if there was a problem.
Note: fname must be in the form of /filename.fil for a file in the root directory
/Directory/filename.fil for a file in a subdirectory of root
/Directory/Subdirectory/filename.fil and so on...
*/
signed int rm_file(char fname[])
{
int
order,
ulinked_entry = 0xE5; // 0xE5 is put into the file's entry to indicate unlinking

int32 i;

char mode[] = "r"; // r is the safest mode to remove files with

FILE stream; // the stream that we'll be working with

// attempt to open the stream
if(fatopen(fname, mode, &stream) == EOF)
return EOF;

// we need to un-link the file's clusters from the FAT if there are clusters allocated
if(stream.Start_Addr > Root_Dir)
{
if(dealloc_clusters(addr_to_cluster(stream.Start_Addr)) == EOF)
return EOF;
}
// get rid of the first entry
i = stream.Entry_Addr;
if(mmcsd_write_data(i, 1, &ulinked_entry) == EOF)
return EOF;

// check to see if there is a long file name
get_prev_entry(&i);
if(mmcsd_read_data(i + 11, 1, &order) == EOF)
return EOF;

// get rid of all of the long file name entries if they're there
while(order == 0x0F)
{
if(mmcsd_write_data(i, 1, &ulinked_entry) == EOF)
return EOF;

if(get_prev_entry(&i) == EOF)
return EOF;

if(mmcsd_read_data(i + 11, 1, &order) == EOF)
return EOF;
}

if(fatclose(&stream) == EOF)
return EOF;

return GOODEC;
}

/*
signed int rm_dir(char dname[])
Summary: Deletes a directory.
Param: The full path of the directory to delete.
Returns: GOODEC if everything went okay, EOF if there was a problem.
Note: dname must be in the form of /Dirname/ for a directory in the root directory
/Dirname/Subdirname/ for a directory in a subdirectory of root and so on...
Note: This function cannot remove all of the files
and subdirectories of the directory. Manually remove all subdirectories
and files before calling this command.
*/
signed int rm_dir(char dname[])
{
char mode[] = "r"; // r is the safest mode to remove files with

FILE stream; // the stream that we'll be working with

// attempt to open the stream
if(fatopen(dname, mode, &stream) == EOF)
return EOF;

// jump over the . and .. entries in the directory
stream.Entry_Addr = stream.Start_Addr + 64;

// check to make sure that there isn't stuff in this directory
if(get_next_file(&stream) != EOF)
return EOF;

// since removing files is a lot like removing directories, we
// can just call rm_file
if(rm_file(dname) == EOF)
return EOF;

return GOODEC;
}

/*
signed int mk_file(char fname[])
Summary: Creates a file.
Param: The full path of the file to create.
Returns: GOODEC if everything went okay, EOF if there was a problem.
Note: This function will not create directories if parent directories don't exist.
Note: fname must be in the form of /filename.fil for a file in the root directory
/Directory/filename.fil for a file in a subdirectory of root
/Directory/Subdirectory/filename.fil and so on...
*/
signed int mk_file(char fname[])
{
char
filename[MAX_FILE_NAME_LENGTH], // the file name we're trying to make
mode[] = "r"; // reading is the safest mode to work in

int
buf, value, // buffer to hold values
entire_entry[0x20],// entire first entry
filename_pos = 0, // the current parse position of the file name we're trying to create
fname_pos; // the current parse position of the input the the function

int32 i; // pointer to memory

FILE stream; // the stream that we'll be working with

// attempt to open up to the directory
if(fatopen(fname, mode, &stream) == GOODEC)
return EOF; // we shouldn't get an GOODEC back from fatopen()
// printf("fatopen OK\r\n");
// check to see if the file is already there.
if(!(stream.Flags & File_Not_Found))
return EOF;

// make a file name
fname_pos = strrchr(fname, '/') - fname + 1;
while((fname[fname_pos] != '\0') && (filename_pos < MAX_FILE_NAME_LENGTH))
{
filename[filename_pos] = fname[fname_pos];
fname_pos += 1;
filename_pos += 1;
// printf("set file name %c", &filename[filename_pos]);

}
filename[filename_pos] = '\0';

// write the name
if(set_file_name(stream.Start_Addr, &i, filename) == EOF)
return EOF;

// throw in some values in the file's first entry
for(buf = 0; buf < 0x20; buf += 1)
entire_entry[buf] = 0;

// this is a file
entire_entry[0x0B] = 0x20;

// entire_entry[14] = 0x40;
// entire_entry[15] = 0x92;
entire_entry[16] = 0xD3;
entire_entry[17] = 0x40;
entire_entry[18] = 0xD3;
entire_entry[19] = 0x40;
entire_entry[24] = 0xD3;
entire_entry[25] = 0x40;



// read what set_file_name gave us for the short name
if(mmcsd_read_data(i, 11, entire_entry) != GOODEC)
return EOF;


// write the entry
if(mmcsd_write_data(i, 0x20, entire_entry) != GOODEC)
return EOF;



/* for ( i=0; i <= 0x20; i++)
printf ("entire_entry[%X]:%c \r\n", i,entire_entry[i]);


if(fatclose(&stream) != GOODEC)
{
printf("Error closing file");
return EOF;
}
*/ g_MMCSDBufferChanged=TRUE;
mmcsd_flush_buffer();
// for ( i=0; i <= 0x20; i++)
// printf ("g_mmcsd_buffer[%X]: %X \r\n", i, g_mmcsd_buffer[i]);
// mmcsd_read_block(i, MAX_FILE_NAME_LENGTH, entire_entry);
// for (value = 0 ; value <= 0x0B; value++)
// {
// mmcsd_read_data(i+value, 1, entire_entry[i]);

// printf(" read from write addr = %lX, HexVal --> %X, AsciiVal--> %c\n\r", i+value, entire_entry[value], entire_entry[value]) ;
// value++;
// }


return GOODEC;
}

/*
signed int mk_dir(char dname[])
Summary: Creates a directory.
Param: The full path of the directory to create.
Returns: GOODEC if everything went okay, EOF if there was a problem.
Note: This function will not create directories if parent directories don't exist.
Note: dname must be in the form of /Dirname/ for a directory in the root directory
/Dirname/Subdirname/ for a directory in a subdirectory of root and so on...
*/
signed int mk_dir(char dname[])
{
char
dirname[MAX_FILE_NAME_LENGTH], // the directory name we're trying to make
entire_entry[0x20], // used to hold the link entries (. and ..) to the directory and its parent
mode[] = "r"; // reading is the safest mode to work in

int
dirname_pos = 0, // the current parse position of the directory name we're trying to create
dname_pos, // the current parse position of the input the the function
j; // counter for loops

int32 i; // pointer to memory

FILE stream; // the stream that we'll be working with

// attempt to open up to the directory
if(fatopen(dname, mode, &stream) == GOODEC)
return EOF; // we shouldn't get an GOODEC back from fatopen()

// check to see if the directory is already there.
if(!(stream.Flags & File_Not_Found))
return EOF;

// make the directory name
dname_pos = strrchr(dname, '/') - dname;
dname[dname_pos] = '\0';
dname_pos = strrchr(dname, '/') - dname + 1;
while((dname[dname_pos] != '\0') && (dirname_pos < MAX_FILE_NAME_LENGTH))
{
dirname[dirname_pos] = dname[dname_pos];
dname_pos += 1;
dirname_pos += 1;
}
dirname[dirname_pos] = '\0';
dname[dname_pos] = '/';

// write the file's name
if(set_file_name(stream.Start_Addr, &i, dirname) == EOF)
return EOF;

// find and allocate an open cluster
if(get_next_free_cluster(&Next_Free_Clust) == EOF)
return EOF;
if(clear_cluster(Next_Free_Clust) == EOF)
return EOF;
#ifdef FAT32
if(write_fat(Next_Free_Clust, 0x0FFFFFFF) == EOF)
return EOF;
#else // FAT16
if(write_fat(Next_Free_Clust, 0xFFFF) == EOF)
return EOF;
#endif // #ifdef FAT32

// throw in some values in the file's first entry
for(j = 0; j < 0x20; j += 1)
entire_entry[j] = 0;

// this is a directory
entire_entry[0x0B] = 0x10;

entire_entry[0x1A] = make8(Next_Free_Clust, 0);
entire_entry[0x1B] = make8(Next_Free_Clust, 1);
#ifdef FAT32
entire_entry[0x14] = make8(Next_Free_Clust, 2);
entire_entry[0x15] = make8(Next_Free_Clust, 3);
#endif // #ifdef FAT32

if(mmcsd_read_data(i, 11, entire_entry) != GOODEC)
return EOF;

// write the file's first entry
if(mmcsd_write_data(i, 0x20, entire_entry) != GOODEC)
return EOF;

// make the two links that point to the directory and the directory's parent
i = cluster_to_addr(Next_Free_Clust);

// put in the first link that points to the directory itself
for(j = 0; j < 0x20; j += 1)
{
if(j < 0x01)
entire_entry[j] = '.';
else if(j < 0x0B)
entire_entry[j] = 0x20;
else if(j == 0x0B)
entire_entry[j] = 0x10;
else
entire_entry[j] = 0x00;
}

entire_entry[0x1A] = make8(Next_Free_Clust, 0);
entire_entry[0x1B] = make8(Next_Free_Clust, 1);
#ifdef FAT32
entire_entry[0x14] = make8(Next_Free_Clust, 2);
entire_entry[0x15] = make8(Next_Free_Clust, 3);
#endif // #ifdef FAT32

if(mmcsd_write_data(i, 0x20, entire_entry) != GOODEC)
return EOF;

for(j = 0; j < 0x0C; j += 1)
{
if(j < 0x02)
entire_entry[j] = '.';
else if(j < 0x0B)
entire_entry[j] = 0x20;
else
entire_entry[j] = 0x10;
}

if(stream.Parent_Start_Addr == Root_Dir)
{
entire_entry[0x14] = 0x00;
entire_entry[0x15] = 0x00;
entire_entry[0x1A] = 0x00;
entire_entry[0x1B] = 0x00;
}
else
{
entire_entry[0x1A] = make8(addr_to_cluster(stream.Parent_Start_Addr), 0);
entire_entry[0x1B] = make8(addr_to_cluster(stream.Parent_Start_Addr), 1);
#ifdef FAT32
entire_entry[0x14] = make8(addr_to_cluster(stream.Parent_Start_Addr), 2);
entire_entry[0x15] = make8(addr_to_cluster(stream.Parent_Start_Addr), 3);
#endif // #ifdef FAT32
}

if(mmcsd_write_data(i + 0x20, 0x20, entire_entry) != GOODEC)
return EOF;

return GOODEC;
}

/// Functions' Utility Functions ///
/// NOTE: A library user should not need to use any of the functions in this section ///

/*
signed int set_file(char fname[], int attrib, FILE* stream)
Summary: This will set the stream to point to the specified file.
Param fname: The file name to search for.
Param attrib: The file attributes to search for. 0x10 is a directory, 0x20 is a file.
Param stream: The stream to set.
Returns: EOF if there was a problem, GOODEC if everything went okay.
Note: The stream has to be pointing to the parent directory's start address when coming in to this function.
*/
signed int set_file(char fname[], int attrib, FILE* stream)
{
int
cur_attrib, // the attribute of the most recently read entry
cur_state, // the state of the most recently read entry
ec = 0; // error checking byte

int32 i;
int16 last_data_cluster,address;

// pointer to memory
#ifndef FAST_FAT
char name_buffer[MAX_FILE_NAME_LENGTH]; // buffer to hold in the most recently read in name
#endif // #ifndef FAST_FAT
last_data_cluster=0;
// set the memory pointer to the parent start address
i = stream->Start_Addr;
// printf("\r\nSet file : Start_Addr --> %lX attrib: %X \n\r", i,attrib) ;
// last_data_cluster =addr_to_cluster(Data_Start);

// mmcsd_read_block(i, MMCSD_MAX_BLOCK_SIZE, g_mmcsd_buffer);
// search for the name of our target file inside of the parent directory
do
{
// read the state and the attribute of the current entry
ec += mmcsd_read_data(i, 1, &cur_state);
// cur_state = g_mmcsd_buffer[0];
// printf("\r\set file read_Addr --> %lX, cur_state-> %X \n\r", i,cur_state) ;

ec += mmcsd_read_data(i + 0x0B, 1, &cur_attrib);
// cur_state = g_mmcsd_buffer[0+0x0B];
// printf("\r\set file read_Addr --> %lX, cur_state--> %X cur_attrib-> %X \n\r", i+ 0x0B,cur_state, cur_attrib) ;
//looking for the last data sector adress
ec += mmcsd_read_data(i + 0x1A, 2, &address);

[neochrome32]

Your code is still incomplete...

i am having some issues with a 2GIG SD

MMCSD.C you wrote and that looks promising..

but the FAT part, is just not working

the important part is that the SD card IS responding to write and reads... perfectly, tested with WinHEX on BOTH my SD (and the offset appears to be found on both)

but still not a working FAT

i am attempting to fix the Petit FS but i just simple dont understand what im doing right now...

AIM .. to do this as quickly as possible....

im sure id figure it out if time wasn't a problem
Thank you

[andrewg]

I've found a new bug in fat.c. Short file names are processed as if they have the type of the directory entry immediately before them, except if that entry is a long file name. Example: a sub-directory with only short file names. The first short file name is actually treated as if it were a sub-directory name (since the first two entries in a sub-directory are '.' and '..').

The function get_file_name() at about line 1563 needs to be changed as follows:

[Punit Khatri]

hello OPAS,

I am using evaluation version of CCS compiler.

I have used both the codes which you have provided (mmcsd.c & fat .c) but it is not working.

on the hyper terminal it is showing "Error Initializing FAT".


could you please provide me the solution of this problem ?