Hello Gordon,
thank you for your reply. I've now dumped all my config descriptor and
double checked with the spec. As far as I've seen, everything should be
ok. Could you please be so kind and have a short look too at it? Maybe I
just looked over it. I'm just curious, as the device works under Windows
and Linux without issues .
Configuration Descriptor
Length (and contents): 152
Raw Descriptor (hex) 0000: 09 02 98 00 02 01 00 80 70 08
0B 00 02 01 00 20
Raw Descriptor (hex) 0010: 00 09 04 00 00 00 01 01 20 00
09 24 01 00 02 0A
Raw Descriptor (hex) 0020: 40 00 00 08 24 0A 01 03 07 03
00 11 24 02 02 01
Raw Descriptor (hex) 0030: 01 00 01 02 03 00 00 00 00 00
00 00 12 24 06 04
Raw Descriptor (hex) 0040: 02 0F 00 00 00 0F 00 00 00 0F
00 00 00 00 0C 24
Raw Descriptor (hex) 0050: 03 03 01 03 00 04 01 00 00 00
09 04 01 00 00 01
Raw Descriptor (hex) 0060: 02 20 00 09 04 01 01 02 01 02
20 00 10 24 01 02
Raw Descriptor (hex) 0070: 00 01 01 00 00 00 02 03 00 00
00 00 06 24 02 01
Raw Descriptor (hex) 0080: 04 18 07 05 01 05 D0 00 01 08
25 01 00 00 01 00
Raw Descriptor (hex) 0090: 01 07 05 81 11 04 00 01
Number of Interfaces: 2
Configuration Value: 1
Attributes: 0x80 (bus-powered)
MaxPower: 224 mA
Interface Association Audio/Unknown
First Interface 0
Interface Count 2
Function Class 1 (Audio)
Function Subclass 0 (Unknown)
Interface Protocol 32
Function String 0 (none)
Interface #0 - Audio/Control
Alternate Setting 0
Number of Endpoints 0
Interface Class: 1 (Audio)
Interface Subclass; 1 (Control)
Interface Protocol: 32
Audio Control Class Specific Header
Descriptor Version Number: 02.00
Category: 10
Class Specific Size: 64
bmControls: 0
Dump Contents (hex): 09 24 01 00 02 0A 40 00 00
Audio Class Specific Clock Source
Clock ID: 1
Attributes: Internal Programmable Clock
Controls: 7
Associated Terminal: 3
Clock Source Name String Index: 0 [NONE]
Dump Contents (hex): 08 24 0A 01 03 07 03 00
Audio Class Specific Input Terminal
Terminal ID: 2
Input Terminal Type: 0x101 (USB streaming)
OutTerminal ID: 0 [NONE]
Number of Channels: 2
Spatial config of channels: 0000000000000011
^. Left Front
^.. Right Front
String index for first logical channel: 0
Terminal Name String Index: 0 [NONE]
Dump Contents (hex): 11 24 02 02 01 01 00 01 02 03 00
00 00 00 00 00
Dump Contents (hex): 00
Audio Class Specific Feature
Unit ID: 4
Source ID: 2
Number of Channels (ch): 2
Master Channel:......................... ( Mute:RW
Volume:RW )
Channel 1:............................. ( Mute:RW
Volume:RW )
Channel 2:............................. ( Mute:RW
Volume:RW )
Feature Unit Name String Index: 0
Dump Contents (hex): 12 24 06 04 02 0F 00 00 00 0F 00
00 00 0F 00 00
Dump Contents (hex): 00 00
Audio Class Specific Output Terminal
Terminal ID: 3
Output Terminal Type: 0x301 (Speaker)
InTerminal ID: 0 [NONE]
Source ID: 4
Terminal Name String Index: 0 [NONE]
Dump Contents (hex): 0C 24 03 03 01 03 00 04 01 00 00 00
Interface #1 - Audio/Streaming
Alternate Setting 0
Number of Endpoints 0
Interface Class: 1 (Audio)
Interface Subclass; 2 (Streaming)
Interface Protocol: 32
Interface #1 - Audio/Streaming (#1)
Alternate Setting 1
Number of Endpoints 2
Interface Class: 1 (Audio)
Interface Subclass; 2 (Streaming)
Interface Protocol: 32
Audio Control Class Specific Header
Audio Stream General
Endpoint Terminal ID: 2
Format Type: 1
Formats PCM
Number of Channels 2
Channel Configuration 3
Dump Contents (hex): 10 24 01 02 00 01 01 00 00
00 02 03 00 00 00 00
Audio Class Specific Audio Data Format
Audio Stream Format Type Desc.
Format Type: 1
Slot Size: 4
Bit Resolution: 24
Dump Contents (hex): 06 24 02 01 04 18
Endpoint 0x01 - Isochronous Output
Address: 0x01 (OUT)
Attributes: 0x05 (Isochronous asynchronous data
endpoint)
Max Packet Size: 0x00d0 (208 x 1 transactions
opportunities per microframe)
Polling Interval: 1 (1 microframe (125 microsecs) )
Class-Specific AS Audio EndPoint
Attributes: 0x00
bmControls: 0x00
bLockDelayUnits: 0x01 (Milliseconds)
wLockDelay: 256 ms
Endpoint 0x81 - Isochronous Input
Address: 0x81 (IN)
Attributes: 0x11 (Isochronous no synchronization
feedback endpoint)
Max Packet Size: 0x0004 (4 x 1 transactions
opportunities per microframe)
Polling Interval: 1 (1 microframe (125 microsecs) )
Thank you,
Bernhard
On 2015-02-05 21:47, Gordon Rankin wrote:
Bernard,
On 2/5/15 3:00 PM, [email protected] wrote:
As it seems the feedback is never queried by
OS X and so there are clicks in the final audio stream.
If you do not see "IN's" for your feedback pipe then your descriptor
tables have not correctly linked the output and feedback pipes
according to spec.
You can get copies of USBProber from the dev kit and dump you tables
to see were the problem is.
Thanks,
Gordon
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