FAT problem

mikn · Post by **mikn** » Wed Nov 12, 2014 8:24 pm

Started at 9:05pm and device stuck on 10:20pm. Again on your control point.
And again, 3 fast write cycles and 4th longer and longer. When started it was same fast as others but minute by minute I noted that it writes longer and longer time. Seems to be the problem with writing every 2048th byte or kinda that. 3 cycles are ok (0-511, 512-1023,1024-1535) and 4th (1536-2047) has accumulating problem..

Post by **Benj** » Thu Nov 13, 2014 11:35 am

Hello Mikn,

Thanks for letting me know. I'm out the office today but will do some investigation and see if I can replicate the problem.

mikn · Post by **mikn** » Mon Nov 17, 2014 6:14 pm

Any news on this?

Post by **Benj** » Wed Nov 19, 2014 2:56 pm

Hello,

I've been somewhat sidetracked by some commercial services projects and training but hope to get some time to further investigate this issue this week.

mikn · Post by **mikn** » Mon Nov 24, 2014 2:13 pm

Hello, Benj!

Any updates on this issue?

mikn · Post by **mikn** » Wed Jan 14, 2015 10:45 pm

I have solved this issue. FAT component is not good for writing data streams, since it always reading and writing FAT and root sector (as I think).

I have wrote my own low-level macros using cal_spi and sd card commands. They also support fat32, but I've implemented the function to write stream. So now I have a way to write 10-20 times faster than standart FC6 FAT component.

Still don't know how to create standalone component to use it in different projects. Will learn some time and export it to public.

Post by **Benj** » Thu Jan 15, 2015 12:57 pm

Hi Mikn,

That's great good thinking, you are right direct writes to the card will be a lot faster as you don't have to maintain the FAT file system tables. A component to do this would be really nice

hyperion007 · Post by **hyperion007** » Tue Feb 03, 2015 1:16 pm

Hi Mikn,

If you don't mind sharing your low level program (through PM if you don't want it public) I would like to have a look and maybe we can get a custom component made for it.

/Daniel S

mikn · Post by **mikn** » Thu Feb 05, 2015 5:54 pm

Hi, the whole project is huge and FAT macros are closely implemented and connected to other macros.
I will try to cut FAT macros into separate blank project. Then you can use them to finalize the component. Now FAT macros use some variables and other macros from different parts of my project. Looks like ball of yarn.

hyperion007 · Post by **hyperion007** » Thu Feb 05, 2015 5:56 pm

Right, I can relate to that description all too well

mikn · Post by **mikn** » Thu Feb 05, 2015 6:10 pm

Will work on FAT macros next week.
Now have to finish riding the MRF49XA, which problems I described here http://www.matrixtsl.com/mmforums/viewt ... 54&t=16097
Either support ignores me or no one works with this component at all and have nothing to say. I spend all the time trying to understand the issue.

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