Re: [ECOS] FAT16 for eCos

[brenner joel <joel dot brenner at tchip dot com>]

James.Harris@tekelek.com.au wrote:

> Hi Joel,
>
> I am just about to start on a CompactFlash data logger and will be using
> FAT12/16 formatting.
> I am not familiar with the term "MultiMediaCard" (I'm new to flash cards).
> CompactFlash cards have IDE interface logic on them. SmartMedia cards have
> contacts like a mobile phone SIM card that simply contains a couple of
> flash dies.
> Is the MultiMediaCard you speak of a CompactFlash or SmartMedia card or
>
> something else?
A MultiMediaCard (digital cameras and MP3 players often uses MMC cards) 
is similar to SmartMedia but have a serial interface witch make it
a good solution for high capacity storage device for small uC based systems. The 3 
wire interface can be used in two manners: SPI communication or MMC protocol communication.
The first one reaches 1 Mb/S the seccond one 20 Mb/S but requires a dedicated interfacing 
component witch at the moment isn't available, so you have to implement it on a FPGA or 
emulating it by SW. The next generation of MultiMediaCards are called SD Cards.


> I have started looking around for FAT12/16 code. According to the FAT spec
> (from the MicroSoft website) a lot of code out there works but is broken in
> common ways.
> I'd also be interested in an eCos FAT12/16 driver if you manage to find
> one, and I'll let you know if I do find one first.
>
> Cheers,
>
> James
If I find one I'll send it you, but I think that there aren't. You can find an example of FAT12/16/32
at http://freedos-32.sourceforge.net/fat.html

> |---------+------------------------------------->
> |         |           brenner joel              |
> |         |           <joel.brenner@tchip.com>  |
> |         |           Sent by:                  |
> |         |           ecos-discuss-owner@sources|
> |         |           .redhat.com               |
> |         |                                     |
> |         |                                     |
> |         |           19-06-2002 12:45 AM       |
> |         |                                     |
> |---------+------------------------------------->
>  >------------------------------------------------------------------------------------------------------------------------------|
>  |                                                                                                                              |
>  |       To:       ecos-discuss@sources.redhat.com                                                                              |
>  |       cc:                                                                                                                    |
>  |       Subject:  [ECOS] FAT16 for eCos                                                                                        |
>  >------------------------------------------------------------------------------------------------------------------------------|
>
>
>
>
> Hi all,
>
> I am new to eCos,
> I've to add a MultiMediaCard Driver to eCos. The driver works fine but,
> to make the MMC readable for "standard" MMC readers,
> a FAT12/16 file-system should be used.
> Is there someone who has wrote a FAT16 support for eCos? If yes, it
> would be possible to receive the necessary source code ?
>
> Best regards, Joel Brenner
>
>
> --
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