I2S_SDO1 doesn't work in my VIM4

marcellom66 · November 6, 2022, 12:20pm

Which system do you use? Android, Ubuntu, OOWOW or others?

Ubuntu

Which version of system do you use? Khadas official images, self built images, or others?

Khadas official images

Please describe your issue below:

I want to use the I2S interface in the 40pin connector, I have actived the i2s and I can see the i2s clock , masterclock and LRclock but when I use speaker-test -Dhw:0,2 -f440 -tsine (I try also -Dhw:0,1…6) but the pin unchange.
How can I do to use this pin?

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numbqq · November 7, 2022, 10:32am

Hello @marcellom66

Have you enable the i2s function with overlay?

Please check:

https://docs.khadas.com/products/sbc/vim4/configurations/device-tree-overlay

Here is my configuration:

$ cat /boot/dtb/amlogic/kvim4.dtb.overlay.env 
fdt_overlays=i2s

After enable i2s, the sound card should be like this:

khadas@Khadas:~$ aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: AMLAUGESOUND [AML-AUGESOUND], device 1: SPDIF-dummy-alsaPORT-spdif soc:dummy-1 []
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: AMLAUGESOUND [AML-AUGESOUND], device 2: TDM-A-dummy-alsaPORT-pcm soc:dummy-2 []
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: AMLAUGESOUND [AML-AUGESOUND], device 3: TDM-B-dummy-alsaPORT-i2s-i2s4hdmirx soc:dummy-3 []
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: AMLAUGESOUND [AML-AUGESOUND], device 4: TDM-C-dummy-alsaPORT-i2s4parser soc:dummy-4 []
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: AMLAUGESOUND [AML-AUGESOUND], device 6: SPDIF-B-dummy-alsaPORT-spdifb soc:dummy-6 []
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: AMLAUGESOUND [AML-AUGESOUND], device 7: EXTN-dummy-alsaPORT-tv soc:dummy-7 []
  Subdevices: 1/1
  Subdevice #0: subdevice #0

0:3 is i2s device.

$ aplay -Dhw:0,3 test002.wav

marcellom66 · November 7, 2022, 10:38am

yes, it works. Thank you.
But why I hear the sound also in my hdmi monitor?

numbqq · November 7, 2022, 10:40am

Yes, the sound will also send to hdmi same with i2s.

marcellom66 · November 7, 2022, 10:42am

is there a way to exclude it ? Or it’s the same .

marcellom66 · November 7, 2022, 10:43am

if I want to use more channels TDM is it possible? like 8 ch RX and 6 ch TX.
Thank you again

Jeter · November 15, 2022, 5:25am

Is there any android app for I2S_SDI1??