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USB-to-Bluetooth
by Unknown on Mar 17, 2004 |
Not available! | ||
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Hi,
I am looking for a Bluetooth module which should sit on to my target USB
host port. Is there any bluetooth module which comes with USB interface
for the embedded applications.
Let me know the availabe modules.
Thanks & regards,
Venkatesh S Naik
L&T Emsys,Mysore
Karnataka,India-570018
Phone No:+918212402561
----- Original Message -----
From: "Ricky Nite" ricky@h...>
To: usb@o...>
Date: Fri, 14 Feb 2003 11:47:03 +0800
Subject: Re: [usb] USB-to-Bluetooth
Hello Marc,
I get your point, thanks - it really doesn't make sense to make the
USB-to-Bluetooth adapter look like a hub. It just has to look like
a
typical USB device that communicates with the upper layers of
the Bluetooth stack and application running on the PC/host.
However, this would mean that I would have to define a separate
USB bus for each peripheral device, because I cannot use the
USB port of the device to make a similar Bluetooth Dongle
connection as I did on the PC/host. I will have to reconfigure the
Dongle as host, which, as I've been told, requires a lot of
resources
and is not supported by existing Dongles.
Is there any other way to do this? Or maybe this is one of those
applications that's just "not meant to be" :) In that case, I won't
use the upstream USB port anymore - I'll just use the downstream
USB port on my host/PC to attach the Dongle, and Bluetooth-enable
all my peripherals...
Ricky Nite
----- Original Message -----
From: Marc Reinig
To: usb@o...
Sent: Thursday, February 13, 2003 10:13 PM
Subject: RE: [usb] USB-to-Bluetooth
Because of the turn-around time (and some other issues), you cannot
just convert transmissions from the PC host and send them to the
device on the other side of the Bluetooth net (and vice versa)
because the Bluetooth protocol will not be able to respond in time
for the USB protocol requirements. So, the USB device must "dummy"
up responses from the remote Bluetooth device until actual
responses are received. This requires extra horsepower at the USB
dongle end. Same issue for the USB-to-Bluetooth adapter to act as a
hub.
In any case, the USB is just a bus to attach the Bluetooth adapter
to the PC Host, Bluetooth can already accept multiple connections,
what would be the function of trying to make the USB-to-Bluetooth
adapter look like a hub?
Marc Reinig
System Solutions
-----Original Message-----
From: owner-usb@o... [mailto:owner-usb@o...]On
Behalf Of Ricky Nite
Sent: Wednesday, February 12, 2003 11:13 PM
To: usb@o...
Subject: Re: [usb] USB-to-Bluetooth
Hello Marc,
Thanks for the reply - so a USB-to-Bluetooth Adapter
is just another USB device as seen by the PC , but I'm
still wondering what you meant with a "smart" USB
device (?)
I'm also trying to find out if it's possible for the PC-attached
USB-to-Bluetooth adapter to emulate a hub, with the
peripheral-attached adapters seen as slave devices (?)
PC-->USB-BT adapter (hub)----->USB-BT adapters
-->peripherals (slaves)
Rgds,
Ricky Nite
----- Original Message -----
From: Marc Reinig
To: usb@o...
Sent: Thursday, February 13, 2003 12:31 PM
Subject: RE: [usb] USB-to-Bluetooth
-----Original Message-----
From: owner-usb@o... [mailto:owner-usb@o...]On
Behalf Of Ricky Nite
Sent: Wednesday, February 12, 2003 7:17 PM
To: usb@o...
Subject: [usb] USB-to-Bluetooth
> I need some clarification on Bluetooth-to-USB transmission.
> As you know, some Bluetooth modules now have an on-chip > USB interface, used for device firmware upgrade and as HCI > transport. Future Bluetooth firmware upgrades will also allow > you to change the USB descriptors in the module so you can > receive data over USB and transmit it over the air.
> However, I was told that this will not allow me to layer
additional
> firmware over the embedded Bluetooth stack to do an exact
> USB cable replacement using a USB-to-Bluetooth adapter/dongle > device, because:
> (1) USB has strict timings which would be violated if the
adapter/
> dongle had to transmit the request over the air and wait for
a
> response.
Correct, though this can be overcome with a "smart" device.
> (2) The Bluetooth module is not capable of being a USB
master,
> (3) The code doesn't fit on chip - USB is "normally" for PC
apps
> where you have ample resources on the host.
These are really part of the same issue. USB has a master/slave concept. The logic/code to be a slave is relatively small compared to that required to be a master.
> As there are already a lot of USB-to-Bluetooth
adapters/dongles
> available in the market, I was just wondering how these
devices
> use USB for their applications. Can anybody shed some light
> on this? They are devices and can be used, as you mentioned, for firmware upload, the connecting bus to the PC, ... But in general, they are devices (slaves) not hosts (masters). Marc Reinig System Solutions |
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