topic Re: Ammlib in S32K

Ammlib

Ayaz — Wed, 09 Apr 2025 15:38:07 GMT

Hi
I am trying to use the AMMCLib in my project, but I am missing some information about how to implement the GDFLIB second-order filter.

but I am not getting the values I expect. I am unsure about the purpose of these buffers

fltFiltBufferX
and

fltFiltBufferY

Could you provide some guidance on how to properly use them?

Re: Ammlib

_Leo_ — Thu, 10 Apr 2025 22:47:57 GMT

Hi,

Thank you so much for your interest in our products and for using our community.

3.15 GDFLIB_FilterIIR2 section of S32K3XXMCLUG gives more details and code example about it.

You can find such filet in C:\NXP\AMMCLIB\S32K3xx_AMMCLIB_v1.1.39\doc.

Hope it helps you. Please let me know if you have more questions about it.

Have a nice day!

Re: Ammlib

Ayaz — Mon, 14 Apr 2025 12:43:19 GMT

i had a look at that document.
I have implemented an IIR filter in my project, which needs to be called periodically. However, the filter only works if I initialize it before each call, which resets the filter. This periodic reset is not acceptable for my design. If I initialize the filter only once at the beginning, it returns NaN values, indicating that the filter is not functioning correctly. Could you please provide an example of how to use the IIR filter effectively for periodic data filtering?
for

GDFLIB_FilterIIR2Init_FLT

and
GDFLIB_FilterIIR2_FLT

Re: Ammlib

Ayaz — Thu, 17 Apr 2025 10:00:12 GMT

I have not received any answer yet

Re: Ammlib

_Leo_ — Wed, 23 Apr 2025 21:12:03 GMT

Sorry foy delay. I noticed that you have another similar case, so I will follow up on this last one that I mention.

https://community.nxp.com/t5/S32K/Amclib/td-p/2085351