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Date: Thu, 11 Sep 2014 21:11:57 +0100
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Subject: Re: LF: OT, Remote site, garden progress
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Status: O

I am following this with a great deal of interest, Laura. Please keep us 
informed.

Many thanks.

73

de Pat G4GVW
QTH Nr Felixstowe, Suffolk
East coast of UK

On 11/09/14 18:16, LZ wrote:
> Hi,
>
> Got the Wolfson card running. Very first impressions:
>
> Since I don't want to compile a new kernel
> (>12h on the R-Pi) I used that image:
> http://blog.georgmill.de/wp-content/uploads/2014/04/kernelAndFirmware_wolfson_rt.tar.bz2
>
> On a Linuxbox I unzipped it and wrote the image to a 4Gb
> card using an ordinary cheap card reader:
> dd if=2014-01-07-wheezy-raspbianW.img of=/dev/sdd
> "of" is the device of the card reader got by "fdisk -l"
> (Don't ask me about doing this on a WinBox. Poor girl here.)
>
> Plugged into a R-Pi with the "Wolfson" in place this image
> booted without any errors. It will run "raspi-config"
> first where you have to do some boring config tasks
> (lang. etc.). OT here.
>
> Next I plugged in an antenna/preamp into the red plug
> and started this modified bash script as root (!):
>
> #!/bin/bash
>
> # Record from onboard Line Input to AP
>
> # input PGA gain
> amixer -Dhw:0 cset name='IN3L Volume' 4 # (mod by Laura)
> amixer -Dhw:0 cset name='IN3R Volume' 4 # (mod by Laura)
>
> # better THD in normal mode vs lower noise floor in high performance
> amixer -Dhw:0 cset name='IN3 High Performance Switch' on
>
> amixer -Dhw:0 cset name='IN3L Digital Volume' 128
> amixer -Dhw:0 cset name='IN3R Digital Volume' 128
>
> amixer -Dhw:0 cset name='LHPF1 Input 1' IN3L
> amixer -Dhw:0 cset name='LHPF2 Input 1' IN3R
> amixer -Dhw:0 cset name='LHPF1 Mode' High-pass
> amixer -Dhw:0 cset name='LHPF2 Mode' High-pass
>
> amixer -Dhw:0 cset name='AIF1TX1 Input 1' LHPF1
> amixer -Dhw:0 cset name='AIF1TX1 Input 1 Volume' 32
> amixer -Dhw:0 cset name='AIF1TX2 Input 1' LHPF2
> amixer -Dhw:0 cset name='AIF1TX2 Input 1 Volume' 32
>
> # The following command should be used to test (mod by Laura)
> arecord -Dhw:0 -r 192000 -c 2 -f S16_LE test.wav
>
> Looking into "test.wav" with "Baudline" all the usual suspects
> from 10-96 kc are present. The "Wolfson" appears quiet and flat.
> At ~53 and ~63kc I'm observing some signals from the 2nd
> Nyquist domain. The experts will know which.
>
> Boring: running "arecord" I got many overruns. Overclocking
> (900 Mhz) did not cure this. Guess it's due to a slow SD card.
> Next step: streaming. Hope that "flac" will work. ?
>
> Laura
>
> Sent from my HapPyPhone
>