Re: [Bluez-users] Has anyone seen these problems with the CSR BlueCore and BlueZ before ?

[Erwin Authried <eauth@softsys.co.at>]

Am Don, den 17.03.2005 schrieb Han Hoekstra um 14:30:
> Hey All,
>  
> I'm developping an application on an ARM-7 based platform which is
> running Linux 2.4.18 with the latest BlueZ version for that platform.
> In this application there is a master device that can connect to up to
> 7 slaves (master and slave devices are all the same, the external
> controller determines which is master).
>  
> The application does the following, the external controller on the
> master can send a single command to the Linux application, in the
> command is an address field identifying to which slaves the command
> must be passed on. A slave will pass the command on to its external
> controller, which will respond to the command by sending a reply back
> to the Linux slave, which in turn passes it on to the Linux master and
> is then handed over to the external controller again. As soon as all
> addressed slaves have responded, the sequence is repeated.
>  
> Now to what I see happening, when I run this with 5 slaves, I don't
> see any problems for more than an hour, but when I run it with 6 or 7
> slaves, I see that the BlueCore resets itself, with 6 slaves after
> about 40 minutes and with 7 slaves already after 5 to 10 minutes. When
> I eliminate the CRC check I can run the 7 slaves configuration for up
> to about 40 minutes after it crashes.
>  
> What I think happens is that the BlueCore receives data to fast over
> the air and can not pass it on to the Linux CPU quick enough, so there
> is an internal overflow in the BlueCore.
> Communication between the BlueCore and the Linux CPU is done via BCSP
> at a speed of 921600 baud.
>  
> Has anybody seen behaviour like this before and is there something I
> can do about it ???
>  
Hi,
I had  problems with uart overruns on an embedded ARM7 system that could
be solved by optimisations in the serial driver and hci_bcsp.c. You
should take a look at /proc/tty/driver to see if you get a lot of
overrun errors. What is your cpu, how many Bogomips does the kernel
show?

Regards,
Erwin




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