On Wed, 1 Jun 2011 11:22:28 -0400, you wrote:

>Hi all,
>
>We need to save/restore setup data for a product, and it would be nice
>to be able
>to do this via thumbdrive.  However, it seems that most 8-bit micros
>(we are using
>an ATMega, but code for a PIC could be used as a template) aren't up to be=
ing a
>USB master.
>
>Is there any code out there that does this?  Or do we have to resort to us=
ing a
>Vinculum chip?  Or go with a SD / SDHC card (many examples out there)?

Master needs specific hardware - on MCUs it;s often OTG, which does host an=
d device.

While the VNC2 would do it, and is much cheaper than the earlier devices, a=
nd you can put your
application on it,  there is a PIC that will also do it, PIC24FJ64GB004 wit=
h USB host/filesystem
source code from Microchip. The USB & file stuff takes about half the flash=
.. Cost is similar to the
VNC2.

It's probably the only MCU with USB host available in DIP, if that matters =
to you...

SD card is simpler and more amenable to doing on an 8-bit PIC or AVR, but i=
t will still take a fair
bit of code space for the FAT stuff.

--=20
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