On 11/01/13 09:19, the mail apparently from Michael Hudson-Doyle included:
Dave Pigott <[email protected]> writes:
On 7 Jan 2013, at 09:46, Andy Green <[email protected]> wrote:
On 07/01/13 17:36, the mail apparently from Dave Pigott included:
Hi Andy,
One other question:
I assume you'll be wanting audio in and out available? On the panda,
which is which? I can't seem to find any documentation on that. :)
It's the bottom connector that is the output from the Panda and the top
connector that's the input to the Panda.
Given a 50/50 chance, I happened to get it the right way first time. :)
So I've tried to run my test in the lab now, but it seems that it's not
possible to capture audio from the device on the host. The other way
around works fine -- I can capture audio on pandaes-02 that was played
on the host -- but not device->host. I just get silence, or very near
it:
http://validation.linaro.org/lava-server/dashboard/streams/private/team/linaro/mwhudson-audio/bundles/fb40806759453f1650756e98044f2201173b2d51/9b8c3255-4c29-4c95-9915-a7e2435dca36/result/2/
(there is a touch of low frequency noise).
I guess audio out in the image I'm using
(http://snapshots.linaro.org/quantal/pre-built/panda/43/panda-quantal_developer_20130109-43.img.gz)
could just be broken -- is this possible? -- or the cable could be
loose, or something else entirely. I guess I'd appreciate it if Dave
could check the cabling :-)
Is there a known good image I could be using?
If it's even halfway modern don't think there'll be any problem with
the Panda audio side in terms of being broken... it has been stable for
many months now on 3.4.
It's more likely to do with input source routing for audio on your host.
Assuming it's physically cabled from the Panda audio out to the "Line
In" you will need to select that input source on the host.
Alsamixer can do it over ssh, alsamixer -c1 (-c<n> selects card n), hit
tab to see input sources. User cursor keys to select "Line In". Hit
space to make it the capture channel, set levels with up/down keys.
Assuming it works after a sufficiency of meddling, you can use alsactl
store / restore <card #> to capture to and restore from a file to automate.
-Andy
--
Andy Green | TI Landing Team Leader
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