[Bluez-users] higher rate than 115 kbits/s with an uart channel

[Bluez-users] higher rate than 115 kbits/s with an uart channel

[Michel Leconte]

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Hi all,

I work with a Bluetooth Kit of Semtech-Xemics which is connected

to a laptop with a Serial/USB adapter (supporting a max rate of 500 kbits/s).

I have a specific command to setup the uart channel of the Kit. 

At Bluez side, I setup the uart rate with the command :

"hciattach /dev/ttyUSB0 any 230400" (for 230,4 kbits/s) 

as I would like to work with a higher rate than 115 kbits/s.

But, at this rate, I couldn't control or setup the kit.

The "hciconfig -a" gives :

hci0: Type: UART

BD Address: 00:00:00:00:00:00 ACL MTU: 0:0 SCO MTU: 0:0

DOWN

RX bytes:10 acl:0 sco:0 events:0 errors:10

TX bytes:4 acl:0 sco:0 commands:1 errors:0

at Rx side, all the packets are with errors. 

What do I miss ? 

Do I have to setup the uart channel rate somewhere else in bluez ? 

The "hciconfig hci0 up" gives :

Can't init device hci0: Connection timed out (110)

For information, at 115 kbits/s, all is fine.

thanks for any suggestion or idea.

Regards.

Michel



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Re: [Bluez-users] higher rate than 115 kbits/s with an uart channel

[Marcel Holtmann]

Hi Michael,

do you mind sending ASCII emails only. I hate the crappy Microsoft
Windows HTML stuff. This is a Linux mailing ;)

> I work with a Bluetooth Kit of Semtech-Xemics which is connected
> 
> to a laptop with a Serial/USB adapter (supporting a max rate of 500
> kbits/s).
> 
> I have a specific command to setup the uart channel of the Kit. 
> 
> At Bluez side, I setup the uart rate with the command :
> 
> "hciattach /dev/ttyUSB0 any 230400" (for 230,4 kbits/s) 
> 
> as I would like to work with a higher rate than 115 kbits/s.
> 
> But, at this rate, I couldn't control or setup the kit.
> 
> The "hciconfig -a" gives :
> 
> hci0: Type: UART
> 
> BD Address: 00:00:00:00:00:00 ACL MTU: 0:0 SCO MTU: 0:0
> 
> DOWN
> 
> RX bytes:10 acl:0 sco:0 events:0 errors:10
> 
> TX bytes:4 acl:0 sco:0 commands:1 errors:0
> 
> at Rx side, all the packets are with errors. 
> 
> What do I miss ? 
> 
> Do I have to setup the uart channel rate somewhere else in bluez ? 
> 
> The "hciconfig hci0 up" gives :
> 
> Can't init device hci0: Connection timed out (110)
> 
> For information, at 115 kbits/s, all is fine.

You must make sure that your device boots up with the higher baud rate
or you have to write a init routine for hciattach to change it. Check
the manual for your developer kit.

Regards

Marcel



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