Liam:
I have managed to get the alsa-libs and aplay, arecord, and speaker-test on
my board, but I am unsure how to get them to play. I have tried making the
device nodes and am using a simple alsa.conf, but still no joy. I am sure
there is something simple I am missing.
Trying to find some documentation on this. I am assuming there is some
disconnect between the interface and my conf file. I have my alsa.conf file
in /usr/share/alsa/ and it is:
pcm.!default {
type hw
card 0
}
pcm.hw {
type hw
card 0
device 0
subdevice 0
}
ctl.!default {
type hw
card 0
}
ctl.hw {
type hw
card 0
}
ctl.w6811 {
type hw
card 0
}
pcm.w6811 {
type hw
card 0
device 0
subdevice 0
}
ctl.!default = ctl.w6811
pcm.!default = pcm.w6811
ctl.hw {
@args[ CARD ]
@args.CARD {
type string
default "0"
}
type hw
card $CARD
}
pcm.hw {
@args[ CARD DEV SUBDEV ]
@args.CARD {
type string
default "0"
}
@args.DEV {
type integer
default 0
}
@args.SUBDEV {
type integer
default 0
}
type hw
card $CARD
device $DEV
subdevice $SUBDEV
}
I have some /proc/ entries:
/proc/asound $ ls
GRHEKW6811 cards pcm version
card0 devices timers
/proc/asound $ cat cards
0 [GRHEKW6811 ]: W6811 - GRH_EK_W6811
GRH_EK_W6811 (W6811)
/proc/asound $ cat devices
0: [ 0] : control
16: [ 0- 0]: digital audio playback
24: [ 0- 0]: digital audio capture
33: : timer
/proc/asound $ cat pcm
00-00: W6811 W6811-PCM-0 : : playback 1 : capture 1
/proc/asound $ cat timers
G0: system timer : 10000.000us (10000000 ticks)
P0-0-0: PCM playback 0-0-0 : SLAVE
P0-0-1: PCM capture 0-0-1 : SLAVE
/proc/asound $ cat version
Advanced Linux Sound Architecture Driver Version 1.0.14rc4 (Wed May 09
09:51:39.
Now, into GRHEKW6811 (which takes me to card0) I get a pcm0c and pcm0p
directory. Using cat info, I get:
/proc/asound/card0/pcm0c $ cat info
card: 0
device: 0
subdevice: 0
stream: CAPTURE
id: W6811 W6811-PCM-0
name:
subname: subdevice #0
class: 0
subclass: 0
subdevices_count: 1
subdevices_avail: 1
/proc/asound/card0/pcm0c $ cd ../pcm0p/
/proc/asound/card0/pcm0p $ cat info
card: 0
device: 0
subdevice: 0
stream:
PLAYBACK
id: W6811
W6811-PCM-0
name:
subname: subdevice
#0
class:
0
subclass:
0
subdevices_count:
1
subdevices_avail: 1
I then did:
mknod -m 666 /dev/snd/pcm0p c 116 0
mknod -m 666 /dev/snd/pcm0c c 116 0
However, when I try speaker-test, I get:
/usr/lib/bin $ ./speaker-test -D pcm0p
speaker-test 1.0.14
Playback device is pcm0p
Stream parameters are 48000Hz, S16_LE, 1 channels
Using 16 octaves of pink noise
ALSA lib pcm.c:2144:(snd_pcm_open_noupdate) Unknown PCM pcm0p
Playback open error: -2,No such file or directory
Same for default:
/usr/lib/bin $ ./speaker-test -D
default
speaker-test 1.0.14
Playback device is
default
Stream parameters are 48000Hz, S16_LE, 1
channels
Using 16 octaves of pink
noise
ALSA lib pcm.c:2144:(snd_pcm_open_noupdate) Unknown PCM
default
Playback open error: -2,No such file or directory
When I try aplay -l and arecord -l, I get:
/usr/lib/bin $ ./aplay
-l
aplay: device_list:204: no soundcards
found...
/usr/lib/bin $ ./arecord
-l
arecord: device_list:204: no soundcards found...
I am at a loss here. Anyone have any advice, pointers, tips, etc......
Thanks.
Paul
--
***************************************
Paul David Kavan
Project Engineer
GRH Electronics, Inc.
402-734-4900
pkavan@xxxxxxxxx
***************************************
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