NRF52840 CMSIS DSP Cosine Transform

[Kebab]

I am trying to implement a DCT on a nrf52840 board and have been looking at using the CMSIS DSP DCT function to achieve this. Does anyone have an example of this function being used? I can't figure out how to use it. As far as I understand, I need to use the init function and then the processing function but I am not sure what the pStateBuffer and pInlineBuffer inputs are.

I am using segger embedded studio and have the DSP package installed.

Thanks!

[Øyvind]

Hello,

The Discrete Cosine Transform (DCT) function is part of the CMSIS DSP Software Library and we do not support this. See this relevant case.

Thank you for your understanding: https://community.arm.com/developer/tools-software/tools/f/keil-forum/12782/cmsis-dsp-dct-type-iv-functions

Best regards,
Oeyvind

[Kebab]

Hi Oeyvind, thanks for the reply. I did not know it was still not supported. I saw a case here that seemed to be solved using that library.

Is there another way that could be recommended to perform a discrete cosine transform?

[Øyvind]

Hello,

Kebab said:

I saw a case here that seemed to be solved using that library.

You are still able to download the CMSIS DSP pack from e.g. Segger Embedded Studio, using the Package Manager. See this case.

Kebab said:

Is there another way that could be recommended to perform a discrete cosine transform?

 Unfortunately, we do not have any alternatives.

Kind regards,
Oeyvind