I2S ADC Headaches
You will need to add the config to target/linux/ramips/modules.mk
At the end of the file my changes are as follows:
define KernelPackage/sound-mt7620 TITLE:=MT7620 PCM/I2S Alsa Driver DEPENDS:=@TARGET_ramips +kmod-sound-soc-core +kmod-regmap +kmod-dma-ralink @!TARGET_ramips_rt288x KCONFIG:= \ CONFIG_SND_RALINK_SOC_I2S \ CONFIG_SND_SIMPLE_CARD \ CONFIG_SND_SIMPLE_CARD_UTILS \ CONFIG_SND_SOC_SPDIF FILES:= \ $(LINUX_DIR)/sound/soc/ralink/snd-soc-ralink-i2s.ko \ $(LINUX_DIR)/sound/soc/generic/snd-soc-simple-card.ko \ $(LINUX_DIR)/sound/soc/generic/snd-soc-simple-card-utils.ko \ $(LINUX_DIR)/sound/soc/codecs/snd-soc-spdif-rx.ko \ $(LINUX_DIR)/sound/soc/codecs/snd-soc-spdif-tx.ko AUTOLOAD:=$(call AutoLoad,90,snd-soc-spdif-rx snd-soc-spdif-tx snd-soc-ralink-i2s snd-soc-simple-card) $(call AddDepends/sound) endef define KernelPackage/sound-mt7620/description Alsa modules for ralink i2s controller. endef
If I recall correctly the above can also more correctly be achieved by doing a:
And enabling the SPDIF module in:
Device Drivers -> Sound card support -> Advanced Linux Sound Architecture -> ALSA for SoC audio support -> CODEC drivers
Hope that helps.
@luz, @UFD guys, you are awesome. I wasted about week to get it work and you told me an answer withing few hours. I can confirm working i2s virtual card. I still can't get sound from mic, but this is hardware problem as I understand.
@zazu-z , Its only because I've spend the last 6 months trying to figure it out. I've also found value in the forum and therefore Im always happy to give back.
The solution is not perfect and I am actually experiencing alsa overrun issues when recording. In my books it's still a challenge that needs a fully understood solution.
What are you recording onto? bigger also buffer or making the process run as a higher priority can help.
I tried your build as I have also spent ages trying to get i2s audio out
and it does work well with my 1502 board( own design) - thanks.
I never got any official reply on whether i2s audio I/o would be part if the 'factory' builds... There is project in the docs that says i2s audio is included and shows
a setup , but its out of date and doesn't work.
I'm looking at manufacturing a combined pcm1502a + pcm186x board
and currently considering the omega2+ as the host processor.
For playback into a pcm1502a board the wiring here will work:
You can ignore the setup stuff, just use UFDs build and it works.
sergiosmail last edited by
Hi @luz I was trying to make max98357A work and have find your post and patches but it doens't work, please let me now your thoughts about the process I've followed..
I'm afraid that I've to insert max98357A module after board boots.. but not sure. It would be nice to know your opinion.
luz last edited by
@sergiosmail do you get anything when doing the following?
root@pixelboard:~# cat /proc/asound/cards 0 [AudioI2S ]: Audio-I2S - Audio-I2S Audio-I2S
If not, please check that you have enabled the kernel package
The 210-omega2-sound-max98357a.diff patch makes sure that the
snd_soc_max98357amodule should get automatically loaded at startup. You can check in
root@pixelboard:~# ls -la /etc/modules.d/*sound* -rw-r--r-- 1 root root 126 Jan 30 2019 /etc/modules.d/30-sound-core -rw-r--r-- 1 root root 13 Jan 30 2019 /etc/modules.d/55-sound-soc-core -rw-r--r-- 1 root root 72 Jan 30 2019 /etc/modules.d/90-sound-mt7620 root@pixelboard:~# cat /etc/modules.d/90-sound-mt7620 snd-soc-wm8960 snd-soc-max98357a snd-soc-ralink-i2s snd-soc-simple-card
Finally, before you can play sounds:
root@pixelboard:~# alsactl init Found hardware: "Audio-I2S" "" "" "" "" Hardware is initialized using a generic method
From here on aplay and other sound tools should work
If you want more control, such as a mixer with two separate volumes for background music and game sounds, look at pixelboard's asound.conf
Also, playing mod files is fun (need very littel disk space, lots of tunes can be found online), possible with the hxcmodplayer package
sergiosmail last edited by
@luz I've repeat all the mentioned steps and it works now... I can't belive
My fault was that I wasn't applying 210-omega2-sound-max98357a.diff correctly. The patch fails for 0.3.2 b238, and I wasn't applying it correctly (doing changes manually)
I've tested using mpg123 mp3 player and aplay commands. Works fine.
Also thank you for the tip about mixer and hxcmodplayer
I tried to connects I2S sound card CJMCU-4344 (alternate PCM5102), based on Cirrus Logic CS4344. I cant understand: all I2S modules are already loaded, why I have no any soundcard device?
These are my sound modules that is loaded:
root@Omega-D913:~# lsmod | grep snd_ regmap_i2c 2298 1 snd_soc_wm8960 snd 41582 12 snd_usb_audio,snd_usbmidi_lib,snd_soc_wm8960,snd_soc_core,snd_compress,snd_pcm_oss,snd_mixer_oss,snd_pcm,snd_timer,snd_rawmidi,snd_seq_device,snd_hwdep snd_compress 10436 0 snd_hwdep 4286 1 snd_usb_audio snd_mixer_oss 12729 1 snd_pcm_oss snd_pcm 61710 6 snd_usb_audio,snd_soc_ralink_i2s,snd_soc_wm8960,snd_soc_core,snd_pcm_dmaengine,snd_pcm_oss snd_pcm_dmaengine 2971 1 snd_soc_core snd_pcm_oss 36177 0 snd_rawmidi 16298 1 snd_usbmidi_lib snd_seq_device 2191 1 snd_rawmidi snd_soc_core 114758 4 snd_soc_simple_card,snd_soc_simple_card_utils,snd_soc_ralink_i2s,snd_soc_wm8960 snd_soc_ralink_i2s 7088 0 snd_soc_simple_card 4304 0 snd_soc_simple_card_utils 5095 1 snd_soc_simple_card snd_soc_wm8960 24224 0 snd_timer 15806 1 snd_pcm snd_usb_audio 121378 0 snd_usbmidi_lib 16883 1 snd_usb_audio usbcore 137059 29 option,uvcvideo,usb_wwan,snd_usb_audio,pl2303,ftdi_sio,cp210x,ch341,usbserial,usblp,usbhid,ums_usbat,ums_sddr55,ums_sddr09,ums_karma,ums_jumpshot,ums_isd200,ums_freecom,ums_datafab,ums_cypress,ums_alauda,snd_usbmidi_lib,cdc_acm,btusb,usb_storage,ohci_platform,ohci_hcd,ehci_platform,ehci_hcd
And we can see no any card installed!
root@Omega-D913:~# aplay -l aplay: device_list:272: no soundcards found...
root@Omega-D913:~# alsactl init alsactl: init:1757: No soundcards found...
root@Omega-D913:~# aplay -L null Discard all samples (playback) or generate zero samples (capture)
root@Omega-D913:~# cat /proc/asound/cards --- no soundcards ---
Onion OS: 0.3.2 b233, kernel version 4.14.81
The kernel objects in the Linux OS' are very capricious thing and one of the biggest problem. So... kernel object will work only in the same kernel version and build number, well I want to say these are likely static feature than dynamical as it give us.
We (users) can't append sound driver or TFT-display (frame buffer driver and his friends), PCI Express->SATA controller, etc.!
To append your own kernel object you have to build you own firmware - it's not convenient. Second way - build kernel objects on the omega (direct compilation), but it needs special tools, like
linux-headers-*, that's out of repositories too.
Let's type code in Python! ((