PCM5142: Purepath compilation process

Tony Walters

Part Number: PCM5142

Hello:

I have a simple flow - bi-quad for low pass * 80hz. I see that Purepath outputs binary files for 44Khz, but for a sequence of cut-off frequencies as follows:

Generating code for base_main_Rate44 .. assembling .....Done.
Generating code for base_Cutoff-70_Rate44 .. assembling .....Done.
Generating code for base_Cutoff-80_Rate44 .. assembling .....Done.
Generating code for base_Cutoff-90_Rate44 .. assembling .....Done.
Generating code for base_Cutoff-100_Rate44 .. assembling .....Done.
Generating code for base_Cutoff-110_Rate44 .. assembling .....Done.
Generating code for base_Cutoff-120_Rate44 .. assembling .....Done.
Generating code for base_Cutoff-130_Rate44 .. assembling .....Done.
Generating code for base_Cutoff-140_Rate44 .. assembling .....Done.
Generating code for base_Cutoff-150_Rate44 .. assembling .....Done.
Generating code for base_Cutoff-160_Rate44 .. assembling .....Done.
Generating code for base_Cutoff-170_Rate44 .. assembling .....Done.
Generating code for base_Cutoff-180_Rate44 .. assembling .....Done.
Generating code for base_Cutoff-190_Rate44 .. assembling .....Done.
Generating code for base_Cutoff-200_Rate44 .. assembling .....Done.
Build succeeded.

1. Why is this the case when I have pre-defined the low pass at 80?

2. I see from another post that Purepath should output different files for all supported sample rates due to coefficients being different for different rates? Should that be the case here also?

3. Do I infer correctly that the Linux driver must then dynamically load into the device different firmware files based on audio source sample rates?

Thank you

Tony

over 8 years ago

0 Paul_Frost over 8 years ago

TI__Guru 56943 points

Hi Tony,

I'll be looking into this today and I hope to get a response asap.

Thanks!

0 Paul_Frost over 8 years ago in reply to Paul_Frost

TI__Guru 56943 points

Tony,

Could you please share your PPS project file? I am not seeing the same output.

Thanks!
Paul

0 Tony Walters over 8 years ago in reply to Paul_Frost

Prodigy 85 points

Sorry for the delay, offsite on a project.

Here is the snapshot of a simple case. I notice as each cutoff line in the build window progresses, the coefficients in the Runtime Properties windows changes which is consistent with the multiple cutoff build files.

The biquad filter is a single low pass filter in this case 200 Hz.

The cfg is attached too. Hmmm .. file attach for that may not have worked. When I poost .cgf files are not among the list of supported file types.

0 Paul_Frost over 8 years ago in reply to Tony Walters

TI__Guru 56943 points

Hi Tony,

Sorry for the delay in getting back to you. I have by trying to recreate the issue that you are seeing, but have been unable to. I will add you as a connection on the e2e forums so you can email me your configuration file as well.

One thing I would like you to verify for me is if there are multiple overlays in your configuration. Please go to Tools>Overview and Configuration Editor>

This should open a window, what do you have listed under the overlays?

0 Tony Walters over 8 years ago in reply to Paul_Frost

Prodigy 85 points

Hi Paul,

Overlay section has just "base". The confoguration section has:

Base

Cutoff 70

Cutoff 80

...

Cutoff 200

This does match the build process log.

Tony

0 Tony Walters over 8 years ago in reply to Tony Walters

Prodigy 85 points

So is the build process trying to be smart by inferring that I may need multiple choices for the crossover and builds out those choices? So then you can instantiate the one you want? As opposed to using I2C to send coefficients to the associated registers?

Cheers,
Tony

0 Paul_Frost over 8 years ago in reply to Tony Walters

TI__Guru 56943 points

I am not totally sure why there are multiple listed in yours. I created a project from scratch and I did not have any besides 'main' in the configuration pane. The Help in the PPS has a pretty in depth explanation of the configurations, and how to generate only one if you want.

Do you think you could have created those configuration on a previous project?

0 Tony Walters over 8 years ago in reply to Paul_Frost

Prodigy 85 points

That must be it! The manufacturer provided me with the default cfg files as a starting point - the configuration section must be saved into the cfg. Have a look at the cfg I sent by email.

0 Paul_Frost over 8 years ago in reply to Tony Walters

TI__Guru 56943 points

Great to hear that we got to be bottom of this. If you think this solved your problem, please mark this thread as resolved.

0 Tony Walters over 8 years ago in reply to Paul_Frost

Prodigy 85 points

All good on this now: I created a configuration foe each crossover freq and it compiles successfuly

Whoo-hoo!

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PCM5142: Purepath compilation process