Re: [Bluez-users] getting bluetooth v1.2

[Marcel Holtmann <marcel@holtmann.org>]

Hi Marco,

> I've a couple of questions regarding bluetooth v1.2:
> 
> - Does the bluetooth version only depend on the firmware or the hardware
> too?
> Following the page http://www.holtmann.org/linux/bluetooth/csr.html I need
> a HCI 18.x firmware to have bluetooth 1.2 support. That would mean it's
> hardware independent.

this depends on the features of Bluetooth 1.2 that you need. For example
eSCO is only working with a BlueCore3 and BlueCore4 in the CSR case.

> - How to upgrade a csr chip? I've d-link DBT-120 revision4. Following the
> page http://www.holtmann.org/linux/bluetooth/features.html I need a
> downgrade
> to revision3 which supports bluetooth 1.2. why switched d-link back to
> bluetooth 1.1 when they already had 1.2 on revision3?

The revision on a D-Link DBT-120 is a hardware revision. It is possible
to update the Rev. 4 dongles, but not with the btdfu program. The flash
timing are not correct.

> I read the page http://www.holtmann.org/linux/bluetooth/dfu.html and my
> conclusion is, that there's no way to upgrade/downgrade the firmware.
> (Because apple explains that after upgrading a device, it will no longer
> work with non apple computers and the windows firmware upgrader is no longer
> available.)

This is non-sense. You simply need to run hid2hci if you upgrade with
the Apple Bluetooth 1.2 firmware.

> Is there another way to upgrade the firmware? I could do it with linux,
> windows and mac, but the dongle should still work with linux afterwards...

The best way is to use the CSR tools, but these tools are not public
available. You can update a D-Link DBT-120 with a MacOS X of course. And
if you are lucky the Linux btdfu also works.

> - actually i'm interested in the inquiry with rssi.
> marcel told in a recent email in the mailinglist that silicon dongles
> might return wrong values (or don't support it). So, which dongles
> do support that and are they already buyable? Currently there are only
> bluetooth 1.1 dongles in the stores I know...

The CSR BlueCore02/BlueCore3/BlueCore4 chips support inquiry with RSSI,
but the Silicon Wave ROM chips I have seen so far have a problem with
inquiry with RSSI event size. The Broadcom chips don't support inquiry
with RSSI (this includes the Microsoft 2.0 dongle).

> Is it still to early for bluetooth v1.2?

It is actually too late, because we are moving to Bluetooth 2.0 with EDR
support.

> - what are the other benefits of bluetooth v1.2?

Mostly AFH, Fast Connect and eSCO.

Regards

Marcel




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