----- Original Message ----- 
From: "Pang" <mailtopang@yahoo.com>
To: <piclist@mit.edu>
Cc: <mailtopang@yahoo.com>
Sent: Wednesday, January 05, 2005 3:59 AM
Subject: [EE] Can a USB host be implemented using an 8 bit uC?


> Hi all,
>
> I am thinking of implementing an USB host on a data
> logging device and are looking at various method of
> doing it. My final intention is to attach a pen drive
> ( which are cheaply and readily available ) to the
> data logging device and remove it after a month and
> copy whatever data stored in the pen drive to a pc.
>
>>From information gathered on the net, it seems that
> most USB host are implemented on higher end micro
> processor. I intend to build the USB 1.1 host that
> will only access pen drive. I understand that i also
> have to write the interface for the FAT32. Any
> suggestions or ideas or valuable links?
>

Yes, forget the idea of using USB. Use a SD or MMC card (like used in 
cameras) which can be interfaced using ordinary SPI even in a small micro. 
Then get a card reader for the PC.

IIRC, there are projects with a available source code on the net using these 
cards and a FAT file system.

This will greatly reduce the complexity of your project.

Bob Ammerman
RAm Systems


-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist