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Old 20th March 2020, 09:28 AM   #21
drone is offline drone  Germany
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Join Date: Jan 2006
Location: Germany Rheinarea
Hi,

this is a very interesting project. Keep posting your results

At the moment I test some display types for my DAC case.
As I am trying to learn some more programming I concentrate on the "hardware.side" of things for now.

But would need some C++ code for reading the sampling rate (and print it out),to put in Poni's fine code base. Which I am not capable of writing by myself (for now )

Regards

Branko
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Old 20th March 2020, 02:35 PM   #22
francolargo is offline francolargo  United States
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Location: Twin Cities, MN
@Drone,
If you want to display the signal sample rate, it can be read and computed from DAC registers 66-69. This will be simple if you use the on-board 100MHz master clock in the Buffalo. However, if you wish to supply the Cronus clock as master - i.e. like 'true sync' - that will introduce uncertainty because the DAC will slave to frequencies that are multiples of either 44.1 or 48kHz. I do not see how the DAC chip would know which frequency it is being fed, although presumably the I2S renderer *will* know what frequency is specified in the music file. So for synchronous operation, if you want to display the signal frequency your C++ software will have to read some data from whatever digital source is creating the I2S. (I have that working with Python on the BBB - sorry but no clue with C++).

F.
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Old 30th March 2020, 05:06 PM   #23
drone is offline drone  Germany
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Join Date: Jan 2006
Location: Germany Rheinarea
Hello Poni,

hope you are well.

Any chance you found some time for the "sampling rate" thing.

Sorry if I am bothering too much.

BR

Branko
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