[yocto] [meta-raspberrypi][question] how to setup alsa on rpi3?

[Piotr Lewicki]

Hi,

I want to use aplay to play a sound on raspberry pi 3, but for some 
reason it does not work for me.

I have built a new "rpi-test-image" with only one difference from 
original- I added "alsa-utils" to the image.

My steps:

1. I ssh'd to the board with the built image,

2. downloaded wav sample ("wget 
http://freewavesamples.com/files/Korg-Triton-Harmonica-C5.wav"),

3. enabled the sound kernel module ("modprobe snd-bcm2835"),

4. tried to play it with "aplay" tool.


It did not work and I got an error:

root at raspberrypi3:~# aplay ./Korg-Triton-Harmonica-C5.wav
ALSA lib ../../alsa-lib-1.1.2/src/confmisc.c:767:(parse_card) cannot 
find card '0'
ALSA lib ../../alsa-lib-1.1.2/src/conf.c:4371:(_snd_config_evaluate) 
function snd_func_card_driver returned error: No such file or directory
ALSA lib ../../alsa-lib-1.1.2/src/confmisc.c:392:(snd_func_concat) error 
evaluating strings
ALSA lib ../../alsa-lib-1.1.2/src/conf.c:4371:(_snd_config_evaluate) 
function snd_func_concat returned error: No such file or directory
ALSA lib ../../alsa-lib-1.1.2/src/confmisc.c:1246:(snd_func_refer) error 
evaluating name
ALSA lib ../../alsa-lib-1.1.2/src/conf.c:4371:(_snd_config_evaluate) 
function snd_func_refer returned error: No such file or directory
ALSA lib ../../alsa-lib-1.1.2/src/conf.c:4850:(snd_config_expand) 
Evaluate error: No such file or directory
ALSA lib 
../../../alsa-lib-1.1.2/src/pcm/pcm.c:2450:(snd_pcm_open_noupdate) 
Unknown PCM default
aplay: main:786: audio open error: No such file or directory


Playing the same wav file with omxplayer ("omxplayer -o local 
./Korg-Triton-Harmonica-C5.wav") works fine.


Do you know how can I set up alsa to make it work on rpi3 board?

Does anybody have it working?

I don't know whether I should start with the alsa configuration or some 
missing packages, or the problem lays in the sound driver.

Any help appreciated,


Thanks,

Piotr Lewicki