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

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

[Wolfgang Mües]

Hello,

I am using the Socket Communications CF Card Rev. G with the CSR chipset=20
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=20
the CSR chipset is initialized after reset. I am using PAN, and I get a=20
file transfer rate of about 150 KBit/s. With other bluetooth devices=20
(USB dongle) I get about 550-600 KBit/s.

I have asked Socket Communications if the card is limited to slow=20
baudrates, and they have answered me that this card is able to perform=20
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?=20
I am able to write/change kernel drivers, but I have no hint where to=20
start and how to get the speed change information in the bcsp protocol.

best regards
Wolfgang M=FCes


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

[Marcel Holtmann]

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




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

[Wolfgang Mües]

Hello Marcel,

Am Samstag, 29. Mai 2004 11:00 schrieb Marcel Holtmann:

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

Been there - done that.

"BCSP initalisation timed out"

230400 Baud is the only baud rate which is working. Do I need a special
version of the hciattach utility?

best regards
Wolfgang M=FCes


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

[Marcel Holtmann]

Hi Wolfgang,

> > this is simple. Try "hciattach <dev> socket 460800".
> 
> Been there - done that.
> 
> "BCSP initalisation timed out"
> 
> 230400 Baud is the only baud rate which is working. Do I need a special
> version of the hciattach utility?

check the mailing list archives for a thread about BCSP and changing the
baud rate. This is not very easy and the CSR guys explained it in very
details.

Regards

Marcel




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