[AudioI] xoscope / Audioinjector Octo RCA integration

[Matt Flax]

On 20/8/21 3:29 pm, Experimental Zeros via People wrote:
> First and foremost, super excited to finally have access to this 
> product and can't wait to have it running!
>
> I would like to use this board to accurately measure amplitude at low 
> frequencies (between 45Hz and 65Hz) and all possible harmonics until 
> the 8Khz band. I feel this board, from design specs and comments on 
> the email thread, is beyond capable of achieving this task.... I might 
> need to short cap/resistor filters, adjust Software/CODEC settings, 
> and who knows what else, but I might be able to pull it as-is!

Yes - shorting them will get you down to DC - perhaps you can just wire 
into the codec as well on the board's headers.


>
> Regardless, I was able to test the board thru audacity (which only 
> access 4 out of the 6 channels correctly) and was hoping that after 
> downloading "xoscope", everything was going to fall in place, but did 
> not: The Octo board is/was not found, neither by default under the 
> "File -> Device" tab, nor by using the settings menu after choosing 
> the "COMEDI" option (which I am pretty sure isn't a valid option) and 
> modifying its settings.
>
> I would appreciate any assistance to get this setup running!.... I 
> would gladly take advice for a software alternative/s that allows me 
> to use the Octo board as an oscilloscope.... I'm currently looking at 
> pyaudio/matplotlib integration....
>
> Thank you in advance.
>
> EZ.
>
> *** My setup: ***
>
> $ aplay -l
> **** List of PLAYBACK Hardware Devices ****
> card 0: audioinjectoroc [audioinjector-octo-soundcard], device 0: 
> AudioInject-HIFI cs42448-0 [AudioInject-HIFI cs42448-0]
>   Subdevices: 1/1
>   Subdevice #0: subdevice #0
>
> $ arecord -l
> **** List of CAPTURE Hardware Devices ****
> card 0: audioinjectoroc [audioinjector-octo-soundcard], device 0: 
> AudioInject-HIFI cs42448-0 [AudioInject-HIFI cs42448-0]
>   Subdevices: 1/1
>   Subdevice #0: subdevice #0
>
Good octo is live.

Is there a problem with pulseaudio interfering ?  If it is, check my 
post to alsa-lib here :

https://github.com/alsa-project/alsa-lib/issues/134


>
> $ dmesg | grep octo
> [    9.025420] audioinjector-octo soc:sound: snd_soc_register_card 
> failed (-517) <---- Is this a problem?????
>
> [   10.595578] Modules linked in: hci_uart btbcm bluetooth 
> ecdh_generic ecc 8021q garp stp llc snd_soc_cs42xx8_i2c 
> snd_soc_cs42xx8 regmap_i2c spidev ftdi_sio brcmfmac usbserial brcmutil 
> sha256_generic snd_soc_audioinjector_octo_soundcard cfg80211 rfkill 
> snd_soc_bcm2835_i2s snd_soc_core snd_compress raspberrypi_hwmon 
> snd_pcm_dmaengine i2c_bcm2835 snd_pcm bcm2835_codec(C) bcm2835_v4l2(C) 
> bcm2835_isp(C) v4l2_mem2mem snd_timer videobuf2_vmalloc 
> bcm2835_mmal_vchiq(C) videobuf2_dma_contig videobuf2_memops 
> videobuf2_v4l2 spi_bcm2835 snd videobuf2_common videodev mc 
> vc_sm_cma(C) w1_gpio wire cn uio_pdrv_genirq uio fixed i2c_dev 
> ip_tables x_tables ipv6
>
> [   10.597423] [<7f2576a4>] (devm_snd_soc_register_card 
> [snd_soc_core]) from [<7f09662c>] 
> (audioinjector_octo_probe+0x178/0x1c0 
> [snd_soc_audioinjector_octo_soundcard])
>
> [   10.597464] [<7f0964b4>] (audioinjector_octo_probe 
> [snd_soc_audioinjector_octo_soundcard]) from [<80713618>] 
> (platform_drv_probe+0x58/0xa8)
>
Not sure about this ... I have even seen kernel panics in dmesg but the 
soundcard works nicely - I have a feeling there is an ALSA bug in 
Raspbian which doesn't render things disfunctional but causes kernel panic.


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