I met a question here. Hope anybody can help on it, thanks.
I'm evaluating whether it is feasible to run the FFT algorithm on zephyr LTS project, with the nRF52832 board. I saw some sayings that it can work with the CMSIS DSP library, but I only found the CMSIS-rtos-v1 and CMSIS-rtos-v2 in zephyr source code (LTS version 1.14), not DSP. So I wonder whether the DSP library is available in zephyr.
Need I download the CMSIS DSP project manually and intergrate into the zephyr project by myself ? Or the library has been integrated into the SDK, just need to include the head files ? It seems not work when I just include the head files with zephyr_include_directories API./opt/zephyr-sdk/arm-zephyr-eabi/bin/../lib/gcc/arm-zephyr-eabi/8.3.0/../../../../arm-zephyr-eabi/bin/ld: ../app/libapp.a(main.c.obj): in function main':
/home/icephyr/projects/ams/zephyr-sensor/zephyr/samples/bluetooth/beacon/src/main.c:369: undefined reference to arm_cfft_f32' /opt/zephyr-sdk/arm-zephyr-eabi/bin/../lib/gcc/arm-zephyr-eabi/8.3.0/../../../../arm-zephyr-eabi/bin/ld: /home/icephyr/projects/ams/zephyr-sensor/zephyr/samples/bluetooth/beacon/src/main.c:373: undefined reference to arm_cmplx_mag_f32'
/opt/zephyr-sdk/arm-zephyr-eabi/bin/../lib/gcc/arm-zephyr-eabi/8.3.0/../../../../arm-zephyr-eabi/bin/ld: /home/icephyr/projects/ams/zephyr-sensor/zephyr/samples/bluetooth/beacon/src/main.c:376: undefined reference to arm_max_f32' /opt/zephyr-sdk/arm-zephyr-eabi/bin/../lib/gcc/arm-zephyr-eabi/8.3.0/../../../../arm-zephyr-eabi/bin/ld: /home/icephyr/projects/ams/zephyr-sensor/zephyr/samples/bluetooth/beacon/src/main.c:393: undefined reference to arm_cfft_sR_f32_len1024'
`
So I think the CMSIS souce code shall be downloaded and included manually, but I am not sure about this, hope anybody knows how to use FFT on zephyr. Some samples can be provided is better.
