Re: [Bluez-devel] first(?) bc4 module

[Marcel Holtmann <marcel@holtmann.org>]

Hi Peter,

> well, at least the 2 MBit mode should be usable over the UART interface.
> The BC04 UART supports 1.5 MBit, but this is "Full Duplex". So if you have
> bi-directioal data transfer that is 3 MBit total. For mostly
> uni-directional traffic even 1.5 MBit is a very good transfer rate over a
> 2 MBit air link because at best you can get around 1.5 MBit user data
> transferred. There is still some HCI overhead on the UART, but I think
> this is only around 1..2% and can be neglected for a first estimate.
> 
> However, for a 3 MBit connection with mostly uni-directional traffic the
> UART interface is not sufficient anymore.

I leave it to the CSR guys to post a correct comment on these things,
but in general the UART interface is no longer what you want if you plan
to use EDR.

> Things again look very different if you use a BC04 with internal SCO
> routing (e.g. for a A2DP headset). But this is a diffrent story.

The SCO stuff has nothing to do with A2DP, because this is ACL based.

Regards

Marcel




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