2005-10-26 16:37:05

by Luca Pizzamiglio

[permalink] [raw]
Subject: [Bluez-devel] big SCO packet

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Hi to all.

I've a little question for Steven or Marcel.
In some circumstances, hcidump show me that chip receive SCO packet with
96 byte of dlen, when mtu is 64.

> SCO data: handle 41 dlen 96
> SCO data: handle 47 dlen 96
< SCO data: handle 41 dlen 48
< SCO data: handle 41 dlen 48
< SCO data: handle 47 dlen 48
< SCO data: handle 47 dlen 48

I see this behaviour with my phone or when I connect my dongle with two
devices.
With a headset, received packet dlen is always 48.

How this circumstance occurs?
Why I can't write SCO packet with dlen = 96, but always dlen < mtu?

Thanks in advance for your reply!!

Cheers,
Pizza
- -------------------------------------------
Luca Pizzamiglio
CEFRIEL - Embedded Systems Design Unit
Via Fucini, 2 - 20133 MILANO (ITALY)
Phone: +39 02 23954 343
e-mail: [email protected]
ICQ: 5046978
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2005-10-27 06:24:50

by Luca Pizzamiglio

[permalink] [raw]
Subject: Re: [Bluez-devel] big SCO packet

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Ok. This is the proof!

hci0: Type: USB
BD Address: xx:xx:xx:xx:xx:xx ACL MTU: 192:8 SCO MTU: 64:8
UP RUNNING PSCAN ISCAN
RX bytes:117 acl:0 sco:0 events:15 errors:0
TX bytes:310 acl:0 sco:0 commands:14 errors:0
Features: 0xff 0xff 0x0f 0x00 0x00 0x00 0x00 0x00
Packet type: DM1 DM3 DM5 DH1 DH3 DH5 HV1 HV2 HV3
Link policy:
Link mode: SLAVE ACCEPT
Name: 'Thor (0)'
Class: 0x3e0100
Service Classes: Networking, Rendering, Capturing
Device Class: Computer, Uncategorized
HCI Ver: 1.1 (0x1) HCI Rev: 0x460 LMP Ver: 1.1 (0x1) LMP Subver:
0x460
Manufacturer: Cambridge Silicon Radio (10)


Cheers,
Pizza

Marcel Holtmann wrote:
> Hi Luca,
>
>
>>I've a little question for Steven or Marcel.
>
>
> before you expect an answer from Steven you should prove that you are
> using a CSR based device ;)
>
> Regards
>
> Marcel

- -------------------------------------------
Luca Pizzamiglio
CEFRIEL - Embedded Systems Design Unit
Via Fucini, 2 - 20133 MILANO (ITALY)
Phone: +39 02 23954 343
e-mail: [email protected]
ICQ: 5046978
- -------------------------------------------
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2005-10-26 16:49:03

by Marcel Holtmann

[permalink] [raw]
Subject: Re: [Bluez-devel] big SCO packet

Hi Luca,

> I've a little question for Steven or Marcel.

before you expect an answer from Steven you should prove that you are
using a CSR based device ;)

Regards

Marcel




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