[wdmaudiodev] Re: UAC1 driver sends volume:0000
- From: Børge Strand-Bergesen <borge.strand@xxxxxxxxx>
- To: wdmaudiodev@xxxxxxxxxxxxx
- Date: Sat, 19 Mar 2016 11:49:36 +0100
Hi Clemens,
I've attached the result of lsusb -v. My device is the "AB-1.x UAC1
[Audio Widget]". I don't see any GET_MIN/MAX/RES values in that dump.
How should I decode those from the Host?
What I see in the Device firmware debug terminal is get_min value of
0x8000, get_max of 0x7FFF, get_res of 0x000A. I'm dumping the same
values to the terminal as are written to the endpoint. I've got a
strong indication that at least the min and max values are available
to the Host.
When I pull the volume slide in Linux I clearly see set_cur_volume
messages within the correct min/max range, although the resolution is
much coarser than 0x000A. When I change the values in firmware to
min=0x80FF, max=7F00, res=0x000A, Linux will operate within that range
as well. Windows 7 UAC1 remains at a static set_cur_volume of 0x0000
with both min/max ranges.
With the experimental 80FF-7F00 range iOS sends set_cur_volume in the
range 80FF-7EFB.
Thanks,
Børge
On Sat, Mar 19, 2016 at 8:17 AM, Clemens Ladisch <clemens@xxxxxxxxxx> wrote:
Børge Strand-Bergesen wrote:
I'm debugging a UAC1 interface to make the Device respond to volume
control signals from the Host. Could you help me figure out why
Windows doesn't seem to alter the volume setting it sends out?
Show the actual descriptors ("lsusb -v" in Linux).
What are the actual values returned by GET_MIN/MAX/RES?
Regards,
Clemens
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