I was planning to use a USB Flashkey for an immediate application.
Unfortunately we've run out of development time, so fell back to MMC, which
offers USB capability indirectly (i.e MMC readers plugging into USB). But I
have an even MORE pressing application for the Flashkey, and will resume
this search when I can. The reason is that there are plans for Flashkeys as
large as 2GB! Its the ultimate solution to this problem.

I'd planned to use a PIC18FXXX to interface to a SL811HS Cypress, which has
a simple uP interface (3 control lines and an 8-bit bus). This would become
the workhorse core for these applications.

But my plan (which is viable, I just have to finish the present job) was to
skip most of the USB interface stuff, and jump straight into the DOS FAT16
structure within the memory map of the Mass Memory Device. In other words,
rather than built a heavy control layer above the USB Host Chip level, just
talk to the Flashkey as if it were a simple mass storage device. THEN
determine, through experiment, where the data is placed, where the FAT
table is etc etc.  Test by experiment, using several Flashkeys and install
files with Windoze then read them through the PIC, etc.

It'll be Sept 30 before I can back to it now, tho..

--Bob
--Bob


At 12:17 PM 7/21/2003 -0400, you wrote:
>      A couple of times in the past I've had to reverse engineer the
> protocol some serial devices use by hooking another computer with two
> serial ports in line to the device in question.  Has anyone here done
> this with USB?  Are there any tools available that make it easier?
>      I don't actually have a use for this info, just trying to satisfy my
> curiosity.
>
>--
>http://www.piclist.com hint: PICList Posts must start with ONE topic:
>[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads

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