Re: [Bluez-users] Embedded bluetooth recommendations

Wiebe Baron
2004-10-28T10:27:04Z

Hi Marcel,

> > I have a question about embedded Bluetooth. I'm working on a feedback
> > control project which involves 8 devices. Up till now a module has
> > been used with integrated stack but this is unable to support an
> > RFCOMM link with seven slaves and the response time of a scatternet is
> > unacceptable so I'm now looking for a multiprocessor solution with a
> > separate stack.
>
> are you talking about seven RFCOMM links on the same ACL link or about
> seven different ACL links. If you really wanna work with piconet where
> the master controls 7 slaves you should use a CSR chip, because all
> other Bluetooth chips are acting somekind weird. However even with the
> CSR stuff you must make sure that at least a HCI 18.2 firmware is used.

Yes the idea is to use seven ACL links. Luckily the current design uses a
sharp process in combination with a CSR chip.

>
> > I'm currently experimenting with a sharp LH79520 with embedded Linux
> > from metrowerks and Bluez but this seems to be overkill because the
> > application requirements themselves are minimal (7 way cable
> > replacement).
>
> The Sharp uses an ARM7TDMI. Actually this is really overkill and then
> you should better buy a Bluetooth chip that itself uses this ARM chip
> like Zeevo etc. However then the above point comes in ...

I took a look at the Zeevo but it only seems to support 4 simultaneous ACK
links which is a bit worrying given that it's based on the same ARM chip.
>
> > Does anyone have a suggestion of a combination of stack, operating
> > system and microprocessor that is known to work together and has
> > minimum requirements in terms of RAM, ROM and processor speed (cost)?
>
> I am not a microprocessor expert, but actually every processor with
> Linux support should be useable and BlueZ is of course the best choice
> for a Bluetooth stack.

Thanks for the advice. This is the route I'm going to be taking.

Cheers,
Wiebe.

>
> Regards
>
> Marcel
>
>
>
>
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