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New FIFO buffer for RPI/SBCs

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#521
jonwhitear said:
I'm having a few problems with BCLK on my RPi as discussed in another thread - sometimes I see the Lock and Empty LEDs flashing alternately. Can this be interpreted as a specific cause, i.e. does it represent a known error?
Click to expand...

I'm not sure if this helps...
For me it sounds like the signal from RPI cannot be interpreted correctly by Kali FPGA!?? I have had the same behavior after adding IL715 isolator chip between ODROID and KALI. After adding 100 Ohm resistors into the I2S signal path between isolator chip and KALI the problem was gone. So I think in my case, the I2S signal was to worse to be recognized as a valid I2S signal by KALI!? Same could happen IMHO when you don't have a valid ground connection between RPI and KALI. So in my case this was a hardware Issue.

But as you use a RPI I would expect that you have directly connected the KALI board on top of the RPI with the 40pin connector!?? In this case the hardware connection should be OK. I would then expect a software / driver problem. Unfortunately I'm not an expert for this. And IMHO you should face the same problem without KALI in the chain!?? Have you checked this?
 
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#524
michl2604 said:
I'm not sure if this helps...
For me it sounds like the signal from RPI cannot be interpreted correctly by Kali FPGA!??
Click to expand...

I think you might be right. I dismantled my DAC again to change SD cards and try some different images with and without the Kali, and now I've put it back together everything seems to be working OK. Guess it was just a poor connection somewhere along the line.
 
#529
cdsgames said:
🙂

We got some very good news...last week we have received the TI license (gpl compatible)
Our team is working on releasing at least 2 players for Piano 2.1. I hope they will be ready by Wednesday the latest .
Click to expand...

What about user configurable??

Quote from your website:
"The board will come pre-programed as a 2.1 output (but you can create your own custom design and load it the board and can access the xover frequency directly from linux (we made a small app)."

The word "made" implies it already exists.
 
#531
Excellent, thanks!
Are there some instructions on how to run the GUI and how to configure the filters (I want to implement 116Hz 2nd order high pass and for the low pass I need 116Hz 2nd order cascaded with 80Hz 2nd order and gain that can be set relative to the high pass)?
 
#532
Hi ,

to have that level of control you need to download Purepath from TI and create your own DSP flows.


Dave S said:
Excellent, thanks!
Are there some instructions on how to run the GUI and how to configure the filters (I want to implement 116Hz 2nd order high pass and for the low pass I need 116Hz 2nd order cascaded with 80Hz 2nd order and gain that can be set relative to the high pass)?
Click to expand...
 
#538
So basically the DSP flows are by frequency (audio thats being played)....we have different DSP flows for different audio files. There is one element in the DSP flows thats particular to frequency so thats why we need multiple flows.

Our driver calls those DSP flows (in user space) ...we are making the doc that will explain how to arrange them It will be ready Monday
 
#539
Does the piano DAC needs a RPI or Spearky, or could it be connected to a computer via USB? Downloaded both manuals, but info is quite succinct.

Also, I'd be super interested about an 8-output DAC, if that's in the works, by any chance....
 
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