Re: [Bluez-users] Problem with slow Speed of Socket CF Card

Marcel Holtmann
2004-05-29T09:00:06Z

Hi Wolfgang,

> I am using the Socket Communications CF Card Rev. G with the CSR chipset
> and the bcsp protocol in my Zaurus C750 with Kernel 2.4.18.
> It is working fine (thank you, guys).
>
> hicattach opens the card with a speed of 230 KBit/s. This is the speed
> the CSR chipset is initialized after reset. I am using PAN, and I get a
> file transfer rate of about 150 KBit/s. With other bluetooth devices
> (USB dongle) I get about 550-600 KBit/s.
>
> I have asked Socket Communications if the card is limited to slow
> baudrates, and they have answered me that this card is able to perform
> about 730 KBit/s under ideal conditions.
>
> Obviously, this is not possible with a serial UART and 230 KBit/s.
> So there must be a speed change command, and I want to use it.
>
> Can anybody give me some usefull advice how to proceed?
> I am able to write/change kernel drivers, but I have no hint where to
> start and how to get the speed change information in the bcsp protocol.

this is simple. Try "hciattach <dev> socket 460800".

Look at the manpage and the source code of hcitattch, because the kernel
hasn't really to do anything with it.

Regards

Marcel