AVR-Chat

Hi Jesper,

Thanks, that was a fantastic idea ! Will give it a try tonite. 

Cheers
Hein B

--- In AVR-Chat@yahoogroups.com, Jesper Hansen <jesperh@...> wrote:
>
> If you're just using this for a logger, you can do it the easy way.
> Format the card as usual on a PC, and (with the PC) create a big txt 
> file that will be big enough for your logging data.
> Write a 4 byte unique tag to the start of that file, and leave the rest 
> as spaces or nulls.
> 
> When writing with the logger:
> * scan sectors for the tag
> * write your data at that location and onwards simply linearly stepping 
> to the next sector if you pass the 512 byte limit.
> * write back the tag.
> repeat
> 
> This is simple and works great. No need to hassle with FAT tables or 
> directory entries.
> 
> /Jesper
> 
> 
> 
> kernels_nz wrote:
> > Does anybody have any documentation that will get me started in
> > generating a FAT16 filesystem on the SD card, so I can log data from a
> > microcontroller to SD card and read as a .txt file on a computer ? Ive
> > had a quick search on google, but would prefer seeing a memory map of
> > what it should look like.
> > 
> > Thanks again guys.
> > 
> > Regards
> > Hein Beyleveld
> > Auckland, New Zealand.
>