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Help me solve my problem of writing on SD card

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SWETA

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WRITING ON SD CARD

Hi everyone,
i am working on interfacing SD/MMC card to ATmega 32..for the same i am using elm-chan's

http://elm-chan.org/fsw/ff/00index_e.html

code for implimenting the FATfile system on the card...
Now as far as creating,opening,closing and reading the file is concerned,i am successfully able to do so...but i am facing problems in writing on the file,being created on the card..
My concern is..
Does writing on the card has got to do with the card's size or with the the FATfilesystem type that is been implimented on the card.
i have formated the card in FAT12 mode through the code only..i have not formated it through PC as it missalligns sectors..
can any one suggest some way through which i can do writing on the card..
any suggestion would be a great help..
 

Re: WRITING ON SD CARD

you can use Winhex to edit removable Disk. and you can access SD Card by USB Card reader...
 

    S

    SWETA

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Re: WRITING ON SD CARD

hi rupesh,

thanks for the help,although i have still not checked how this software works..But,the code that i am using has a function for writing operation on the card,and it does support other functions as well for communicating with the card...all other functions are working fine,and i am using terminal Bray++software for the serial communication between card and MCu..all commands i am sending from pc through this application..

Now,you only suggest if using winhex is a good option in this case...
and then i will go ahead...
 

Re: WRITING ON SD CARD

Yes... If you are using Winhex then you only need USB Card reader to R/W in Memory card. and you can do low level format of Memory by Filling FF/00 in All Sector.

it will solve your Problem "missalligns sectors.."


"Does writing on the card has got to do with the card's size or with the the FATfilesystem type that is been implimented on the card."

Yes Minimum File Size is Depend on card Size,NO of Sector and FAT ...

https://en.wikipedia.org/wiki/File_Allocation_Table
 

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