[iPAQ] RE: [Bluez-users] More than 115kbit/s over bluetooth with ipaq 3870 ?

The 3870 can easily handle 230400 baud.

Change the baudrate on the CSR chip first using pskey, restart your
machine, and connect at the higher baudrate. Something like "hciattach
/dev/ttySB0 csr 230400" should work. You don't need to use "setserial"
- that's only for specifying the raw underlying clock rate.

In theory the 3870 can run the UART off of a faster base clock (it
normally uses the 3.6864 MHz clock --> 3.6864 / 16 = 230400 baud --->
that's your maximum speed). That's a hardware mode that I have not
tested, and requires some kernel hacking to implement. If you're
interested, look in h3600_asic_io.c in the "h3600_asic_bluetooth_up()"
function where it enables the clocks.

        - Andrew

> -----Original Message-----
> From: Kilian Weniger [mailto:weniger@tm.uka.de]
> Sent: Tuesday, August 20, 2002 3:16 AM
> To: bluez-users@lists.sourceforge.net; ipaq@handhelds.org
> Subject: [Bluez-users] More than 115kbit/s over bluetooth
> with ipaq 3870 ?
>
>
>
> Hi,
>
> I just got BlueZ working with the built-in csr chip of my
> ipaq 3870, but I
> only get a maximum throughput of less than 115kbit/s. I guess
> the reason is
> the serial interface between the ipaq and the bluetooth csr chip.
>
> Is it possible to increase the maximum throughput to more
> than 115200 bit/s?
> I understand, that the csr chip can be configured to support higher
> baudrates by changing the key 191 with pskeys (as described in
> http://www.geocrawler.com/archives/3/11993/2002/3/100/8148714/ ).
>
> But how can I configure the UART of the ipaq to handle more
> than 115200
> baud? (does "seterial" work?) I worry if I only change the
> baudrate of the
> csr chip, I'm unable to communicate to it afterwards, because
> the baudrate
> of the chip is different from the one of the UART.
>
>
>
> Kilian
>
>
>
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Received on Tue Aug 20 12:27:38 2002