Re: [Sdcc-user] USB protocol stack for 8051 ?

[Karl B. <ka...@tu...>]

Robin, USB is not symetrical/peer to peer.  It is master/slave, and
the chips are sold seperately: you can buy slave(function) chips
for peripherals, and you can buy master chips for mainboards.
There is some initiative to produce some peer USB capabilities, but
I don't think it's mainstream yet.  Linux has open source stacks, for
both ends(some of the PDA's use the slave/function controllers).


On Fri, May 09, 2003 at 04:02:03PM +0530, Robin Randhawa wrote:
> Greetings.
>=20
> I am designing an 8051 based system that can communicate with an HP 3352 =
USB=20
> Printer via the Philips PDIUSBD12 USB Controller.
> I have the PCB ready and initial microcontroller tests work fine (I am us=
ing a=20
> Philips 89C51RD2).
>=20
> I wanted to know if there are any open USB stack implementations for=20
> microcontrollers which I could use ?
>=20
> I am currently studying the firmware code provided by Philips.
>=20
> Is there some documentation available that describes the USB data flow be=
tween=20
> this USB Printer (or is there a standard among USB printers?) and the USB=
=20
> controller ?
>=20
> Any pointers would be much appreciated.
> Thanks,
> Robin.=20=20
>=20
>=20
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>=20
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