On 14/02/14 11:47, Christian Gagneraud wrote:
On 12/02/14 20:36, Matt Flax wrote:
I have implemented the jack2 iio driver and have done a couple of tests.
In a preliminary finding, waiting for more time to test and re-test, I
have had success.
I don't see any overruns reported (when setup properly), and I haven't
put a signal through the system to highlight any un-reported overruns.
Next week I will look into this more.
Hi Matt,
This is a very interesting usage of the linux-iio framework. Can you
say a bit more about your analog front-end? Did you use an audio IC,
or SPI/I2C ADC? If so which one.
Thank you,
The chips were AD7476A chips, so an SPI bus. There was hardware level
and kernel level support from Lars-Peter Clausen and Alexandru Tofan.
Matt
Thanks,
Chris
Firstly I would like to say that writing a driver for jack2 is a little
difficult because there is not much documentation ... at least I
couldn't find simple information. Some inline src doc would be good ...
mind you, I could have put more into my driver as well :)
On the system with IIO devices I ran :
jackd -iio
I then setup and ran netjack on both computers.
On the other computer I used :
jack_capture -c 2 -p system:capture*
... wahlah ... it worked ! with an MTU of 1500. Thats 2 channels @ 1 MHz
Everything reporting 1MHz sample rates and so on a so forth, no xruns
and the wav file looked like what I expected ...
When I tried to record 4 channels @ 1 MHz, I had to increase the MTU to
6000 to get rid of xruns on the ARM core. But still ... 4 channels @
1MHz over a network ... pretty good start !
I would like to integrate my both of my iio branchs into the jack1 and
jack2 repos, but for now I have forked the jack2 repo here :
https://github.com/flatmax/jack2/tree/iio
I have some questions for other developers of jack2.
is it necessary to use :
JackDriver::CycleTakeBeginTime();
and
JackDriver::CycleTakeEndTime();
?
thanks
Matt
p.s. Don't forget that these findings are very preliminary and things
need to be neatened up, debugged more and so on and so forth.
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