USB to 802.11b client radio

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stevech
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Level: Raving Lunatic
Joined: Tue. Dec 18, 2001
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Posted by stevech: Wed. Nov 13, 2002 - 05:24 AM
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With USB based 802.11b transceivers (radios) so cheap now, it would be great if a small micro could use USB and some not too complex code to send/receive messages on 802.11. This could be merely MAC layer messages. No IP, no TCP. This might be a fairly small amount of code. Maybe even doing UDP on IP via this USB link would be small code. ARP could be avoided with hard-coded addresses.

There's public doman USB code for Linux, from Atmel. But it's not decipherable by me, to find the basic USB MAC layer protocol.

Anyone have any pointers?

Steve

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AVR Microcontrollers, megaAVR and tinyAVR
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stelios
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Joined: Sat. Mar 10, 2001
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Posted by stelios: Mon. Nov 18, 2002 - 01:25 PM
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Steve,

To attach to a usb slave device (the radios) you need usb host capabilities which is VERY complicated.
There are only a couple of usb host chips that can attach to an mcu (for the moment) but the main obstacle would be that a usb (host) stack is required.
USB is designed in such a way that all the complexity resides in the host (the pc) and is handlded by the operating system.
There is a new specification that is been adopted "USB on the Go" which provides a much simpler interface but i haven't look into into for details.

Stelios

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