Ti-RTOS CC3200 app append to flash file issue

Gleb Orlikov

Hello Everybody,

I have created a file on flash (ROM).
I am writing 4 bytes to file (offset 0) and after that i am trying to write again 4 bytes from offset 4.

For example:

index - 0 1 2 3 4 5 6 7 ...

data - 4 3 2 1 4 3 2 1 ...

Code example:

unsigned char buff[] = {4,3,2,1};

File Open...

sl_FsWrite(*lFileHandle, 0, (unsigned char *)buff, 4);

sl_FsWrite(*lFileHandle, 4, (unsigned char *)buff, 4);

When i read the data i get:

index - 0 1 2 3 4 5 6 7 ...

data - 255 255 255 255 4 3 2 1 ...

Any suggestions?

over 10 years ago

0 Tom Kopriva over 10 years ago

TI__Mastermind 20480 points

Hi Gleb,

I think the Simplelink forum support can help you better with this. We'll move this post to their forum.

0 Alon Srednizki over 10 years ago in reply to Tom Kopriva

TI__Mastermind 18455 points

Hi Gleb,

Please make sure you are not closing the file before the 2nd write as reopening it for write will erase the old date.
if you didn't close the file, can you please provide your code snippet for review?

Thanks,
Alon

0 Gleb Orlikov over 10 years ago in reply to Alon Srednizki

Prodigy 245 points

Hi Alon,

I must to close the file after the first writing. I cannot leave it opened.

How can i append the data next time?

Thank you.

0 Alon Srednizki over 10 years ago in reply to Gleb Orlikov

TI__Mastermind 18455 points

Hi Gleb,

There is no way to do it if you are closing the file.
We don't have an "Append" operation. the only way to do it is to leave the file open.
You can, of course, implement a work around of reading the old data and writing it from beginning including the new content.

I'm not aware of your exact use case, but please note that serial flash parts have limitation of about 100,000 writes. so, please take notice to the number of writes you are planning for your product lifetime.

Thanks,
Alon

0 Gleb Orlikov over 10 years ago in reply to Alon Srednizki

Prodigy 245 points

Thank you Alon.

I need to implement a FIFO using flash memory.
Can i write/read data on flash without using the files ?

0 Alon Srednizki over 10 years ago in reply to Gleb Orlikov

TI__Mastermind 18455 points

Hi Gleb,

I'm sorry, but, no, it isn't possible.

Thanks,
Alon

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Ti-RTOS CC3200 app append to flash file issue