CMSIS DSP APIs not working with nrf52840 (nrf Connect SDK v1.5.0)

RE: CMSIS DSP APIs not working with nrf52840 (nrf Connect SDK v1.5.0)

Vidar Berg — Wed, 04 Aug 2021 07:10:52 GMT

Sure. I searched the list here (link) for "CMSIS_DSP" to find the configuration settings related to CMSIS DSP. The kernel configuration tool can be open with "west build -t guiconfig" if you build from the command line. SES has it's own Kconfig tool that you can open like this:

Best regards,

Vidar

RE: CMSIS DSP APIs not working with nrf52840 (nrf Connect SDK v1.5.0)

Omer Farooq — Tue, 03 Aug 2021 14:49:58 GMT

Thanks.

For the sake of completeness could you please share what CONFGs are required in prj.conf file to enable other DSP functionalities shown in the list of GUI that you shared? Second, can you please also share with me where I can find this Zephyr kernel configuration tool?

Best regards,

Omer

RE: CMSIS DSP APIs not working with nrf52840 (nrf Connect SDK v1.5.0)

Vidar Berg — Tue, 03 Aug 2021 14:11:54 GMT

Hi Omer,

Thanks for the clarification. Turns out you need to add CONFIG_CMSIS_DSP_TRANSFORM=y as well.

RE: CMSIS DSP APIs not working with nrf52840 (nrf Connect SDK v1.5.0)

Omer Farooq — Tue, 03 Aug 2021 13:43:26 GMT

Hi,

That works fine for me as well because in the program there is no arm_cfft_ function. If you notice the screenshot that you shared with me you can see that it only includes "modules/cmsis/CMSIS/DSP/Sources/BasicMarhFunctions/...". However, transform functions and other DSP related functions are in other directories inside modules/cmsis/CMSIS/DSP/Sources/. I think because the IDE is not pulling them into the project, hence there is a problem. One way to pull them all is to customize CMakelist, however I suspect there will be more elegant and straight forward way to pull them in the project. Please try the example code that I shared before, and you will definitely see the error.

Best regards,

Omer

RE: CMSIS DSP APIs not working with nrf52840 (nrf Connect SDK v1.5.0)

Vidar Berg — Tue, 03 Aug 2021 13:19:54 GMT

Hi,

I have not been able to replicate the issue here. I even tried with your prj.conf file.

The project I used for testing (not performing any actual math operations, just checking that the DSP libraries got linked into the project)

devzone.nordicsemi.com/.../0207.hello_5F00_world.zip

Can you try and see if you get the same error if you build my project?

RE: CMSIS DSP APIs not working with nrf52840 (nrf Connect SDK v1.5.0)

Omer Farooq — Tue, 03 Aug 2021 13:07:40 GMT

Hi,

I did try that before and just now, but it does not make any difference. The prj.conf file that I used just now is given below.

Best regards,

Omer

CONFIG_GPIO=y
CONFIG_FPU=y
CONFIG_NEWLIB_LIBC=y
CONFIG_NEWLIB_LIBC_FLOAT_PRINTF=y
CONFIG_CMSIS_DSP=y

devzone.nordicsemi.com/.../6371.prj.conf

RE: CMSIS DSP APIs not working with nrf52840 (nrf Connect SDK v1.5.0)

Vidar Berg — Tue, 03 Aug 2021 12:55:31 GMT

Hi,

Looks like you are missing CONFIG_NEWLIB_LIBC=y from your configuration. Please add it to your prj.conf file and try again.

Vidar