help getting audio cape rev b1 working

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1

I have followed the instructions found at http://elinux.org/CircuitCo:Audio_Cape_RevB#Audio_Cape_Revision_B1 and I’m just getting static when I try speaker-test -f 600 or aplay filename.wav. the wav file plays fine on my windows laptop and aplay identifies it properly but just static for audio. what may I have missed?

here’s dmesg:

root@beaglebone:~# dmesg|tail
[ 1088.018924] bone-capemgr bone_capemgr.8: slot #4: Requesting firmware ‘BB-BONE-AUDI-02-00A0.dtbo’ for board-name ‘Override Board Name’, version ‘00A0’
[ 1088.028213] bone-capemgr bone_capemgr.8: slot #4: dtbo ‘BB-BONE-AUDI-02-00A0.dtbo’ loaded; converting to live tree
[ 1088.029031] bone-capemgr bone_capemgr.8: slot #4: #4 overlays
[ 1088.059524] of_get_named_gpio_flags: can’t parse gpios property
[ 1088.071612] 1-0018 supply IOVDD not found, using dummy regulator
[ 1088.071867] 1-0018 supply DVDD not found, using dummy regulator
[ 1088.072049] 1-0018 supply AVDD not found, using dummy regulator
[ 1088.072277] 1-0018 supply DRVDD not found, using dummy regulator
[ 1088.098289] davinci_evm sound.10: tlv320aic3x-hifi <-> 48038000.mcasp mapping ok
[ 1088.134015] bone-capemgr bone_capemgr.8: slot #4: Applied #4 overlays.

and a listing of slots showing the card:

root@beaglebone:~# cat /sys/devices/bone_capemgr.*/slots
0: 54:PF—
1: 55:PF—
2: 56:PF—
3: 57:PF—
4: ff:P-O-L Override Board Name,00A0,Override Manuf,BB-BONE-AUDI-02

Thanks,

Eric

2

I have followed the instructions found at http://elinux.org/CircuitCo:Audio_Cape_RevB#Audio_Cape_Revision_B1 and I’m just getting static when I try speaker-test -f 600 or aplay filename.wav. the wav file plays fine on my windows laptop and aplay identifies it properly but just static for audio. what may I have missed?

Try the attached DTO. I generated this myself before Circuitco published theirs. When Circuitco published their DTO I described what I thought were problems but no one responded.

Regards,
John

BB-BONE-AUDI-02-00A0.dts (1.42 KB)

BB-BONE-AUDI-02-00A0.dts (2.44 KB)

3

I have followed the instructions found at http://elinux.org/CircuitCo:Audio_Cape_RevB#Audio_Cape_Revision_B1 and I’m just getting static when I try speaker-test -f 600 or aplay filename.wav. the wav file plays fine on my windows laptop and aplay identifies it properly but just static for audio. what may I have missed?

BTW, I don’t have the LEDs defined in my DTO so you will have to add those back in to my DTO if you want those to work.

Regards,
John

4

What LED’s are you referring to? the audio board has no LED’s.

Eric

5

John,

here’s what happens when I use your .dts file:

root@beaglebone:~# export SLOTS=/sys/devices/bone_capemgr.*/slots
root@beaglebone:~# echo BB-BONE-AUDI-02 > $SLOTS
-bash: echo: write error: Invalid argument

and when I use the one linked to in the instructions (http://elinux.org/images/1/10/BB-BONE-AUDI-02-00A0.zip) - yes I extracted the file from the zip archive first…):

root@beaglebone:~# export SLOTS=/sys/devices/bone_capemgr.*/slots
root@beaglebone:~# echo BB-BONE-AUDI-02 > $SLOTS

(no errors)

Thanks,

Eric

6

ok,

seems the issue was one related to software and expectations… and maybe a messed up debian install. when I entered the command 'speaker-test -c2 -f600 I expected a 600hz tone… I got white noise - but paying close attention to the text output, it said it was playing noise. starting with a freshly imaged card and following the instructions from there seems to have it working with the files linked from the instructions. Note to the designers of this cape - adding a stereo audio amp to drive headphones to a bit higher level would be extremely welcome.

Eric

7

ok,

seems the issue was one related to software and expectations… and maybe a messed up debian install. when I entered the command 'speaker-test -c2 -f600 I expected a 600hz tone… I got white noise - but paying close attention to the text output, it said it was playing noise. starting with a freshly imaged card and following the instructions from there seems to have it working with the files linked from the instructions. Note to the designers of this cape - adding a stereo audio amp to drive headphones to a bit higher level would be extremely welcome.

Use amixer to increase the volume.

Regards,
John

8

What LED’s are you referring to? the audio board has no LED’s.

I don’t know since I don’t have an audio cape. The audio cape DTS refers to two LEDs on the board.

Regards,
John

9

John,

here’s what happens when I use your .dts file:

root@beaglebone:~# export SLOTS=/sys/devices/bone_capemgr.*/slots
root@beaglebone:~# echo BB-BONE-AUDI-02 > $SLOTS
-bash: echo: write error: Invalid argument

That is very strange. How did you compile the audio cape DTS? I just place it in the firmware/cape folder and updated the makefile so that it is compiled when I build the kernel.

Regards,
John

10

I had a similar issue with this. I had to change this commands a little.

export SLOTS=`ls /sys/devices/bone_capemgr.*/slots`
echo BB-BONE-AUDI-02 > $SLOTS

Regards,