Re: [Alsa-user] USB feature unit

2015-03-24 Thread Clemens Ladisch
Tom Jewell wrote: > I couldn't understand why in fact RES was being requested. It's the only way to check if it is supported. > bLength13 > bDescriptorType36 > bDescriptorSubtype 6 (FEATURE_UNIT) > bUnitID 5 > bS

Re: [Alsa-user] USB feature unit

2015-03-23 Thread Tom Jewell
On 03/23/2015 12:37 AM, Clemens Ladisch wrote: Tom Jewell wrote: I'm trying to debug some code that implements a feature unit in an (incoming) USB device, based on an AT32UC3B1256 controller. The feature unit contains only a volume control, for which the host requests and I provide values for

Re: [Alsa-user] USB feature unit

2015-03-23 Thread Clemens Ladisch
Tom Jewell wrote: > I'm trying to debug some code that implements a feature unit in an > (incoming) USB device, based on an AT32UC3B1256 controller. The feature > unit contains only a volume control, for which the host requests and I > provide values for MAX, MIN, CUR, and RES. The host then trie

[Alsa-user] USB feature unit

2015-03-20 Thread Tom Jewell
I'm trying to debug some code that implements a feature unit in an (incoming) USB device, based on an AT32UC3B1256 controller. The feature unit contains only a volume control, for which the host requests and I provide values for MAX, MIN, CUR, and RES. The host then tries to set RES to half t