l2cap question

Bluez-users Christoph Torens 2 participants 6 messages Aug 25, 2004 – Aug 27, 2004 Bluetooth drivers

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Christoph Torens

author

2004-08-25 20:55 UTC #0 lore raw

Hi,

I have two questions:
First:
Is it possible to do a program communication just over l2cap? Without rfcomm/pand/dund.
(Because after a very long time of tests, l2ping is the only thing that works with my USB host-controller chip / driver) If yes: Is there some small Tool I could use to test this? Perhaps read and write a string over l2cap.

Second:
Does a Bluetooth USB-Dongle use isochronus USB transfers? And if yes: when or where?
(Because the USB host driver seems to have problems with isoc. transfers and I'm not sure if this actaully is the error I am fighting with)

Signature · 13 lines

Regards,
Christoph


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Marcel Holtmann

maintainer

2004-08-25 21:29 UTC #1 lore raw

Hi Christoph,

Quoted 4 lines

I have two questions:
First:
Is it possible to do a program communication just over l2cap? Without rfcomm/pand/dund.

it might be possible, but L2CAP is SOCK_SEQPACKET and RFCOMM is SOCK_STREAM. You should keep this in mind and also is written in the profile specifications.

Quoted 4 lines

(Because after a very long time of tests, l2ping is the only thing that works with my USB host-controller chip / driver) If yes: Is there some small Tool I could use to test this? Perhaps read and write a string over l2cap.

Take a look at l2test and rctest from bluez-utils.

Quoted 3 lines

Second:
Does a Bluetooth USB-Dongle use isochronus USB transfers? And if yes: when or where?

It uses it for SCO support.

Quoted 3 lines

(Because the USB host driver seems to have problems with isoc. transfers and I'm not sure if this actaully is the error I am fighting with)

Disable SCO support for the USB driver and no ISOC transfers are used.

Regards

Marcel

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Christoph Torens

author

2004-08-26 00:36 UTC #2 lore raw

Hi,

Quoted 2 lines

Quoted 1 line
Does a Bluetooth USB-Dongle use isochronus USB transfers?
It uses it for SCO support.

I read SCO is only (or mainly?) for speech.
I don't use speech, but I guess it is somehow used when SCO is enabled in the config?
Is it used by "hciconfig hci0 up", too?
(This is making problems with some, but not all dongles)

Quoted 4 lines

Quoted 3 lines
(Because the USB host driver seems to have problems with isoc. transfers and I'm not sure if this actaully is the error I am fighting with)
Disable SCO support for the USB driver and no ISOC transfers are used.

That is a great idea.
I think this could really help me finding some answers. Hope to test it tomorrow.

Thank you for this tip, Marcel

Signature · 2 lines

Regards,
Christoph

Marcel Holtmann

maintainer

2004-08-26 10:33 UTC #3 lore raw

Hi Christoph,

Quoted 8 lines

Quoted 2 lines
Quoted 1 line
Does a Bluetooth USB-Dongle use isochronus USB transfers?
It uses it for SCO support.
I read SCO is only (or mainly?) for speech.
I don't use speech, but I guess it is somehow used when SCO is enabled in the config?
Is it used by "hciconfig hci0 up", too?
(This is making problems with some, but not all dongles)

show me the "hciconfig -a" and "/proc/bus/usb/devices" for these dongles and I will mark them with broken SCO support.

Regards

Marcel

Christoph Torens

author

2004-08-27 13:58 UTC #4 lore raw

Hi Marcel, Hi List,

Quoted 5 lines · Marcel Holtmann

Hi Christoph,
Quoted 3 lines
Quoted 2 lines
Quoted 1 line
Does a Bluetooth USB-Dongle use isochronus USB transfers?
It uses it for SCO support.

Quoted 8 lines

Quoted 5 lines
I read SCO is only (or mainly?) for speech.
I don't use speech, but I guess it is somehow used when SCO is enabled in the config?
Is it used by "hciconfig hci0 up", too?
(This is making problems with some, but not all dongles)
show me the "hciconfig -a" and "/proc/bus/usb/devices" for these dongles and I will mark them with broken SCO support.

ok, here it follows. But I dond't understand, I thought my hostcontroller has isoc problems? But Why does this dongle have problems with the command and the Acer BT510 Zeevo chip not?

The device with problems is a EPoX BT-DG02A

root@viper root# hciconfig -a
hci0: Type: USB

        BD Address: 00:04:61:81:11:3C ACL MTU: 192:8  SCO MTU: 64:8
        UP RUNNING PSCAN ISCAN
        RX bytes:384 acl:0 sco:0 events:17 errors:0
        TX bytes:308 acl:0 sco:0 commands:16 errors:0
        Features: 0xff 0xff 0x0f 0x00 0x00 0x00 0x00 0x00
        Packet type: DM1 DM3 DM5 DH1 DH3 DH5 HV1 HV2 HV3
        Link policy: RSWITCH HOLD SNIFF PARK
        Link mode: SLAVE ACCEPT
        Name: 'BlueZ (0)'
        Class: 0x000100
        Service Classes: Unspecified
        Device Class: Computer, Uncategorized
        HCI Ver: 1.1 (0x1) HCI Rev: 0x20d LMP Ver: 1.1 (0x1) LMP Subver:

0x20d
Manufacturer: Cambridge Silicon Radio (10)

root@viper root# cat /proc/bus/usb/devices

T:  Bus=01 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#=  1 Spd=12  MxCh= 2
B:  Alloc=  0/900 us ( 0%), #Int=  0, #Iso=  0
D:  Ver= 1.10 Cls=09(hub  ) Sub=00 Prot=00 MxPS= 8 #Cfgs=  1
P:  Vendor=0000 ProdID=0000 Rev= 0.00
S:  Product=USB ISP116x Root Hub
S:  SerialNumber=0
C:* #Ifs= 1 Cfg#= 1 Atr=40 MxPwr=  0mA
I:  If#= 0 Alt= 0 #EPs= 1 Cls=09(hub  ) Sub=00 Prot=00 Driver=hub
E:  Ad=81(I) Atr=03(Int.) MxPS=   2 Ivl=255ms
T:  Bus=01 Lev=01 Prnt=01 Port=01 Cnt=01 Dev#=  2 Spd=12  MxCh= 0
D:  Ver= 1.10 Cls=e0(unk. ) Sub=01 Prot=01 MxPS=64 #Cfgs=  1
P:  Vendor=0a12 ProdID=0001 Rev= 5.25
C:* #Ifs= 3 Cfg#= 1 Atr=c0 MxPwr=  0mA
I:  If#= 0 Alt= 0 #EPs= 3 Cls=e0(unk. ) Sub=01 Prot=01 Driver=hci_usb
E:  Ad=81(I) Atr=03(Int.) MxPS=  16 Ivl=1ms
E:  Ad=02(O) Atr=02(Bulk) MxPS=  64 Ivl=0ms
E:  Ad=82(I) Atr=02(Bulk) MxPS=  64 Ivl=0ms
I:  If#= 1 Alt= 0 #EPs= 2 Cls=e0(unk. ) Sub=01 Prot=01 Driver=hci_usb
E:  Ad=03(O) Atr=01(Isoc) MxPS=   0 Ivl=1ms
E:  Ad=83(I) Atr=01(Isoc) MxPS=   0 Ivl=1ms
I:  If#= 1 Alt= 1 #EPs= 2 Cls=e0(unk. ) Sub=01 Prot=01 Driver=hci_usb
E:  Ad=03(O) Atr=01(Isoc) MxPS=   9 Ivl=1ms
E:  Ad=83(I) Atr=01(Isoc) MxPS=   9 Ivl=1ms
I:  If#= 1 Alt= 2 #EPs= 2 Cls=e0(unk. ) Sub=01 Prot=01 Driver=hci_usb
E:  Ad=03(O) Atr=01(Isoc) MxPS=  17 Ivl=1ms
E:  Ad=83(I) Atr=01(Isoc) MxPS=  17 Ivl=1ms
I:  If#= 1 Alt= 3 #EPs= 2 Cls=e0(unk. ) Sub=01 Prot=01 Driver=hci_usb
E:  Ad=03(O) Atr=01(Isoc) MxPS=  25 Ivl=1ms
E:  Ad=83(I) Atr=01(Isoc) MxPS=  25 Ivl=1ms
I:  If#= 1 Alt= 4 #EPs= 2 Cls=e0(unk. ) Sub=01 Prot=01 Driver=hci_usb
E:  Ad=03(O) Atr=01(Isoc) MxPS=  33 Ivl=1ms
E:  Ad=83(I) Atr=01(Isoc) MxPS=  33 Ivl=1ms
I:  If#= 1 Alt= 5 #EPs= 2 Cls=e0(unk. ) Sub=01 Prot=01 Driver=hci_usb
E:  Ad=03(O) Atr=01(Isoc) MxPS=  49 Ivl=1ms
E:  Ad=83(I) Atr=01(Isoc) MxPS=  49 Ivl=1ms
I:  If#= 2 Alt= 0 #EPs= 0 Cls=fe(app. ) Sub=01 Prot=00 Driver=(none)

root@viper root#

Signature · 2 lines

Regards,
Christoph

Marcel Holtmann

maintainer

2004-08-27 14:13 UTC #5 lore raw

Hi Christoph,

Quoted 8 lines

Quoted 2 lines
show me the "hciconfig -a" and "/proc/bus/usb/devices" for these dongles and I will mark them with broken SCO support.
ok, here it follows. But I dond't understand, I thought my hostcontroller has
isoc problems? But Why does this dongle have problems with the command and the
Acer BT510 Zeevo chip not?

the Zeevo Chip has no ISOC endpoints and is already broken in some way.

Quoted 1 line

The device with problems is a EPoX BT-DG02A

I can't blacklist this device and it should also work prefect. Maybe this is a problem of your USB host controller.

Regards

Marcel