CCS/TM4C123GH6PM: SD Card overwrites previous data written

user5281760

Part Number: TM4C123GH6PM

Tool/software: Code Composer Studio

Hi all,

I am currently trying to make a stable communication between my Tiva TM4C123GH6PM and a SD Card. I need it because I want to save data from a variety of sensors in a single line in a text file continuously.

I am able to create and write some data in the text file, but only once, because everytime the program remounts it, it seems like the position of the cursor of the text file resets, and the data gets overwritten.

Is there a way to save the position of the cursor even when the file is closed and dismounted? Or is there a way to write in the text file without needing to close and dismount it?

I am putting my program here for better analysis of the situation. Currently using the mmc-dk-tm4c123g.c examples to help.

Regards,

Álvaro.

S20_microSD_Testes.rar

over 6 years ago

0 Charles Tsai over 6 years ago

TI__Guru**** 191486 points

Hi,

Perhaps you can try f_open with FA_OPEN_APPEND flag and see if that makes a difference. The documentation can be found in <TivaWare_Installation>/third_party/fatfs/doc/00index_e.html. If your question is related to the MCU then we can assist you better. For the third party software, we are not really the experts. I hope you can find the solutions by doing some Google search.

0 user5281760 over 6 years ago in reply to Charles Tsai

Prodigy 30 points

Hello Charles,

Thanks for the quick reply, your suggestion did resolve my issue, thank you very much!

But i had to download files such as ff.c, diskio.h, integer.h, and etc from another source. This happened because apparently either my TivaWare files or my Fat files are not 100% updated. I did take a look at the document you suggested me, but I did not find the FA_OPEN_APPEND on it like you did.

Regards,

Álvaro.

0 Charles Tsai over 6 years ago in reply to user5281760

TI__Guru**** 191486 points

Hi,
What TivaWare version do you have? The latest is 2.1.4.178. Please download from http://www.ti.com/tool/SW-TM4C.

0 user5281760 over 6 years ago in reply to Charles Tsai

Prodigy 30 points

Hello Charles,

I checked and yes, my TivaWare version is the latest version 2.1.4.178. So it seems like the fatfs files are not updated.

regards,

Álvaro

0 Charles Tsai over 6 years ago in reply to user5281760

TI__Guru**** 191486 points

Hi,

This is how I find it. After you click on the 00indiex_e.html file, go to the bottom of the page and then click on the FatFs home page. From there if you click on the f_open then you will find the updated info. Give it a try.

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CCS/TM4C123GH6PM: SD Card overwrites previous data written