Appending data to a file using the ATA libraries for SD cards on the TMS320C5515

Mike241

I have been trying to append data to the end of a file. I open the file, seek to the end using ATA_seek, then write using ATA_write, but it always seems to write in the wrong spot. When I wrote to a small file, the beginning (byte index 0) was overwritten. When I wrote to a larger file, it started writing further into the file (byte index 4096) . Perhaps it is always writing to the beginning of the last sector used in the file.

Is a fix available for this problem? I have attached a copy of the larger file for reference. This is after it has been written to by the ATA code. The original file consisted of 12 repetitions of the same text.

Fullscreen 5824.Hello.txt Download

Hello.  Do not erase me, please!!!! abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz
Hello.  Do not erase me, please!!!! abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz
Hello.  Do not erase me, please!!!! abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz
Hello.  Do not erase me, please!!!! abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz
Hello.  Do not erase me, please!!!! abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz
Hello.  Do not erase me, please!!!! abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz
Hello.  Do not erase me, please!!!! abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz
Hello.  Do not erase me, please!!!! abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz
Hello.  Do not erase me, please!!!! abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz
Hello.  Do not erase me, please!!!! abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz
Hello.  Do not erase me, please!!!! abcdefghijklmnopqrstuvwxyzabcdefghijklmnABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABABuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz

over 14 years ago

0 Hyun Kim over 14 years ago

TI__Genius 14965 points

Hi,

Which CSL example are you running? Just make sure that you are using the latest CSL 2.10.

Regards,

Hyun

0 Mike241 over 14 years ago in reply to Hyun Kim

Intellectual 620 points

Hyun,

I'm using 2.10.00. ...

Thanks.

0 Hyun Kim over 14 years ago in reply to Mike241

TI__Genius 14965 points

Good you are using the latest CSL.

Are you using example 4 or example 6 in the mmc_sd example directory?

Regards,

Hyun

0 Mike241 over 14 years ago in reply to Hyun Kim

Intellectual 620 points

I'm essentially using the CSL_MMCSD_SdCardFSExtExample project, but pulled it into my own project so I could keep the original while I try extended functionalities.

0 Hyun Kim over 14 years ago in reply to Mike241

TI__Genius 14965 points

Hi, I tested it and I don't see an issue. I used csl_mmcsd_atafs_ext_example.c and modified a little bit as below.

#if 0

/* Set the file name */

ATA_setFileName(pAtaFile, fileName, "txt");

ata_error = ATA_create(pAtaFile);

#else

ata_error = ATA_fopen(pAtaFile, fileName, "txt");

#endif

if(ata_error != ATA_ERROR_NONE)

{

printf("ATA_fopen Failed\n");

return(ata_error);

}

else

{

printf("\nFile Creation/Open on SD card is Successful\n");

}

/* Reset the file pointer to the beginning */

ATA_seek (pAtaFile, CSL_MMCSD_ATA_BUF_SIZE); // <-- add it before write.

/* Write data to the file */

ata_error = ATA_write(pAtaFile, gMmcWriteBuf, CSL_MMCSD_ATA_BUF_SIZE);

The original file has ABABAB...... and the appended file has ABAB......CDCDCD..... CD part has been appended.

csl_mmcsd_atafs_ext_example.zip

0 Mike241 over 14 years ago in reply to Hyun Kim

Intellectual 620 points

Hyun,

Your code works if I have run the original "..._ext" demo first. If I want to append data to the end of an unrelated file, there seem to be several requirements, namely the following,

File names must be in ALL CAPS
Names must be the 8.3 or shorter format (e.g. "TEMP5678.TXT")
The files must contain an even number of bytes

I used the following code to make it happen:

len = (pAtaFile->Size);

//Size is in bytes, ATA_seek requires words

ATA_seek (pAtaFile, len / 2);

0 Mike241 over 14 years ago in reply to Hyun Kim

Intellectual 620 points

Thanks, for your help, Hyun.

0 Hyun Kim over 14 years ago in reply to Mike241

TI__Genius 14965 points

Ok Thanks for updates.

Regards,

Hyun

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Appending data to a file using the ATA libraries for SD cards on the TMS320C5515