Thanks for letting me know that MUSB & DMA is no longer a thing. With that
in mind, I finally figured out my problem getting the USB audio to work.
Turns out my USB audio device was pulling too much current from the USB
port. Beginner's mistake! I finally tried connecting it to a powered USB
hub and now it’s working. Should have tried that a long time ago, but I was
confused by the mpg123 error messages and the DMA issues others were having
when trying to get USB audio to work.
Since I figure this might help others, here are the steps I took to get
things working:
I re-flashed the eMMC with
‘bone-eMMC-flasher-ubuntu-18.04.4-console-armhf-2020-03-12-2gb.img’. It
looks like the kernel is “Linux 4.19.94-ti-r36 armv71”.
I installed mpg123 and tested it with an mp3 file. It worked, sending its
output to the default HDMI output.
I then plugged in the USB audio device. Sure enough, It shows up when
calling ‘aplay -L’.
To set the USB audio to the default audio device, I next created a file
called ‘/etc/asound.conf’ with following:
pcm.!default {
type hw
card 1
}
ctl.!default {
type hw
card 1
}
Running ‘alsamixer’ from the command line should now show USB audio as the
connected audio device.
Finally, make sure the USB audio device is connected to a powered USB hub
and things should work. Before I had the powered hub, I would get the
following error when running ‘mpg123 Swish.mp3’ (this is what threw me off
for so long):
High Performance MPEG 1.0/2.0/2.5 Audio Player for Layers 1, 2 and 3
version 1.25.10; written and copyright by Michael Hipp and others
free software (LGPL) without any warranty but with best wishes
[?25l
Terminal control enabled, press 'h' for listing of keys and functions.
Playing MPEG stream 1 of 1: Swish.mp3 ...
MPEG 1.0 L III cbr128 48000 mono
[src/libout123/modules/alsa.c:181] error: cannot open device default
[src/libout123/libout123.c:585] error: failed re-opening of device after
pause
main: [src/mpg123.c:798] error: Deep trouble! Cannot flush to my output
anymore!
[src/libout123/modules/alsa.c:181] error: cannot open device default
[src/libout123/libout123.c:585] error: failed re-opening of device after
pause
Anyway, thanks to Robert and everyone else for your help. Audio is a playin!
On Sunday, May 31, 2020 at 12:38:41 PM UTC-7, RobertCNelson wrote:
>
> On Sun, May 31, 2020 at 2:30 PM <[email protected] <javascript:>> wrote:
> >
> > Thanks Robert for providing these instructions. Does anyone know if
> there are any changes required since they were posted in 2016? I was able
> to build the linux image as described, but after installing it onto the BBB
> using dpkg the board no longer boots. Instead, it hangs immediately on
> power-up with all 4 LEDs on.
> >
> > Any ideas for things to try would be greatly appreciated.
>
> First regarding, MUSB & DMA, we gave up.. It's been PIO mode by
> default for a few years now..
>
> Second, which kernel are you using? Please if you can also share a
> usb serial boot log (using J1)
>
> https://elinux.org/Beagleboard:BeagleBone_Black_Serial
>
> Regards,
>
> --
> Robert Nelson
> https://rcn-ee.com/
>
--
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