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by komeda
Fri Jan 25, 2019 10:25 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: STICKY: The I2S sound thread.
Replies: 925
Views: 462393

Re: STICKY: The I2S sound thread.

Hi, maybe someone here can help me out with my setup, because I don't really understand how to do this right: I have a samplerate converter SRC4382 with I2S output and I have a HiFiBerry DAC+ Pro both connected to the according default I2S pins on the pi. The HiFiberry alone works fine and I want to...
by komeda
Thu Jun 09, 2016 1:35 pm
Forum: Troubleshooting
Topic: Crackling when using USB2 audio interfaces
Replies: 20
Views: 2748

Re: Crackling when using USB2 audio interfaces

Thx for pointing that out. I played around with different parameters and forgot to change things back. Just did that now, changed the cmdline.txt of the troubled busybox to the same values as the lfs system, exept for the ext3/4 part. No change, the busybox has crackles. ;(
by komeda
Thu Jun 09, 2016 10:06 am
Forum: Troubleshooting
Topic: Crackling when using USB2 audio interfaces
Replies: 20
Views: 2748

Re: Crackling when using USB2 audio interfaces

Here we go, crackling busybox system: ~ uname -a Linux AroioEX 4.4.11-v7 #2 SMP PREEMPT Tue May 24 17:11:26 UTC 2016 armv7l GNU/Linux ~ # dmesg | grep otg [ 0.000000] Kernel command line: dma.dmachans=0x7f35 bcm2708_fb.fbwidth=720 bcm2708_fb.fbheight=480 bcm2709.boardrev=0xa01041 bcm2709.serial=0x2e...
by komeda
Wed Jun 08, 2016 8:32 am
Forum: Troubleshooting
Topic: Crackling when using USB2 audio interfaces
Replies: 20
Views: 2748

Re: Crackling when using USB2 audio interfaces

Sure, I can do that later on when I come home.
by komeda
Mon Jun 06, 2016 3:00 pm
Forum: Troubleshooting
Topic: Crackling when using USB2 audio interfaces
Replies: 20
Views: 2748

Re: Crackling when using USB2 audio interfaces

Nope, only system having trouble is the busybox and I spent over a week investigating why. Alsa is loading/configuring itself upon usage with plughw:0 (so there should be no difference between LFS and busybox) and apart from that the kernel and modules are the same. I don't see anything else involve...
by komeda
Mon Jun 06, 2016 12:57 pm
Forum: Troubleshooting
Topic: Crackling when using USB2 audio interfaces
Replies: 20
Views: 2748

Re: Crackling when using USB2 audio interfaces

I have two systems, both Pis. One is a Linux from scratch, here it is working, one is a busybox system, derived from the LFS. Here it crackles. Both have identical kernels, cmdline.txt and config.txt. All libraries and binaries are of course the same.
by komeda
Tue May 31, 2016 2:26 pm
Forum: Troubleshooting
Topic: Crackling when using USB2 audio interfaces
Replies: 20
Views: 2748

Re: Crackling when using USB2 audio interfaces

jdb, are still with me? I was so happy, you stepped in...
by komeda
Mon May 30, 2016 6:39 pm
Forum: Troubleshooting
Topic: Crackling when using USB2 audio interfaces
Replies: 20
Views: 2748

Re: Crackling when using USB2 audio interfaces

And the same for the system where it is working fine: lsusb -v can't get debug descriptor: Success Bus 001 Device 002: ID 0424:9514 Standard Microsystems Corp. SMC9514 Hub Device Descriptor: bLength 18 bDescriptorType 1 bcdUSB 2.00 bDeviceClass 9 Hub bDeviceSubClass 0 bDeviceProtocol 2 TT per port b...
by komeda
Mon May 30, 2016 6:39 pm
Forum: Troubleshooting
Topic: Crackling when using USB2 audio interfaces
Replies: 20
Views: 2748

Re: Crackling when using USB2 audio interfaces

Ok, here we go, Focusrite Scarlet 2i4 via D-Link DUB-H7 USB powered Hub. The Scarlett won't work without it. lsusb -v can't get debug descriptor: Invalid argument Bus 001 Device 002: ID 0424:9514 Device Descriptor: bLength 18 bDescriptorType 1 bcdUSB 2.00 bDeviceClass 9 bDeviceSubClass 0 bDeviceProt...
by komeda
Mon May 30, 2016 6:13 pm
Forum: Troubleshooting
Topic: Crackling when using USB2 audio interfaces
Replies: 20
Views: 2748

Re: Crackling when using USB2 audio interfaces

Right, for the Native Instruments interface it is snd_usb_caiaq while for the Focusrite it is snd_usb_audio. They both show the exact same behaviour, working fine on one system and on the other one garbled.

I will hook up the Focusrite later on and get back to you with new input..
by komeda
Mon May 30, 2016 5:08 pm
Forum: Troubleshooting
Topic: Crackling when using USB2 audio interfaces
Replies: 20
Views: 2748

Re: Crackling when using USB2 audio interfaces

There is no such file as stream0 on either of my systems. In /proc/asound/card0 i have id midi0 pcm0c/ pcm0p/ I guess you are after information in /proc/asound/card0/pcm0p/sub0 , there are hw_params info status sw_params ...and here are all of them for a garbled playback: ~ # cat /proc/asound/card0/...
by komeda
Mon May 30, 2016 4:02 pm
Forum: Troubleshooting
Topic: Crackling when using USB2 audio interfaces
Replies: 20
Views: 2748

Re: Crackling when using USB2 audio interfaces

Ok, here is a crackling Native Instruments Audio 8 DJ USB 2 interface on the busybox: can't get debug descriptor: Invalid argument Bus 001 Device 002: ID 0424:9514 Device Descriptor: bLength 18 bDescriptorType 1 bcdUSB 2.00 bDeviceClass 9 bDeviceSubClass 0 bDeviceProtocol 2 bMaxPacketSize0 64 idVend...
by komeda
Sun May 29, 2016 10:47 am
Forum: Troubleshooting
Topic: Crackling when using USB2 audio interfaces
Replies: 20
Views: 2748

Re: Crackling when using USB2 audio interfaces

No one?
by komeda
Fri May 27, 2016 11:59 am
Forum: Troubleshooting
Topic: Crackling when using USB2 audio interfaces
Replies: 20
Views: 2748

Crackling when using USB2 audio interfaces

Hi there, I am experiencing massive problems with USB DACs for a week now and I can't seem to wrap my mind around the problem. I am developing an embedded audio-streamer built around a busybox, which I set up myself. The embedded system is derived from a Linux From Scratch system. I compile everythi...

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