Yeah don't read too much into anything just yet - there are a lot of compromises you have to make until you have the hardware to support what you really want to do. There is still a lot of work to be done. The good thing is - capes will be in my hands in the next couple of weeks, just about to order them.
You can check this using vmstat and top. Unless the player is particularly badly optimized, there is no reason for it to skip on 384k stereo and to not skip on 8 channel 96k HDMI playback... so if 8 channel works and 384k doesn't, there is probably something to tune somewhere to make it work.
If you're using realtime sample rate conversion, it's a different story...
On my desktop PC I run the player with realtime priority like this :
sudo schedtool -R -p 1 -e alsaplayer -d "hw:CARD=DAC,DEV=0"
The kernel isn't a realtime one (just a vanilla desktop kernel). The -ck kernels have an Isochronous (SCHED_ISO) priority level which is more practical :
Planning to place my pre-order shortly, can I get a steer on this aspect please.
Ta muchly
Ray
Beta board preview
Here is what I have right now for a layout.
I have uFL to MCK,BCK,D1,D2 (B3SE mapped)
I added teleporter header.
I have a header that exposes most of the raw signals (I will document that later)
There is power that can optionally supply or be supplied by the BBB via L1
Header for direct connection to B3 or B3 SE
I2C header on dedicated I2C channel.
I made provision for the big Crystek, or smaller less expensive clocks. They are offset to better allow the use of two separate paste masks for production.
Feedback welcome.
Cheers!
Russ
Here is what I have right now for a layout.
I have uFL to MCK,BCK,D1,D2 (B3SE mapped)
I added teleporter header.
I have a header that exposes most of the raw signals (I will document that later)
There is power that can optionally supply or be supplied by the BBB via L1
Header for direct connection to B3 or B3 SE
I2C header on dedicated I2C channel.
I made provision for the big Crystek, or smaller less expensive clocks. They are offset to better allow the use of two separate paste masks for production.
Feedback welcome.
Cheers!
Russ
Attachments
Its everything I would wish for, can't think of anything else thats needed.
Waiting with eager anticipation!
Its got everything I could want except an insertion point for a Trident or similar regulator for the clocks... but I'd rather get a Biotic sooner than wait for that, especially given your comment a few posts back.
BTW, SPDIF input gone? Not an issue for me, just curious.
Greg in Mississippi
BTW, SPDIF input gone? Not an issue for me, just curious.
Greg in Mississippi
Power regulation?
Hi Russ,
Another question for your beta design: when you say,
"There is power that can optionally supply or be supplied by the BBB via L1"
do you mean that there will be regulation of the input power by the cape? BBBs come with an input pin for a 5 V supply. If I connect the supply to the cape instead of the BBB will it be regulated?
I am looking forward to this exciting development. Thanks for your fine work.
- David
Hi Russ,
Another question for your beta design: when you say,
"There is power that can optionally supply or be supplied by the BBB via L1"
do you mean that there will be regulation of the input power by the cape? BBBs come with an input pin for a 5 V supply. If I connect the supply to the cape instead of the BBB will it be regulated?
I am looking forward to this exciting development. Thanks for your fine work.
- David
Looking forward to this, it looks pretty much spot on.
Can't wait to give it a try.
I fear that may price it beyond my budget!
Russ, given you are allowing for the 2 sizes of oscillators are you planning different versions or just hedging your bets?
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