How can i Get Lower FFT step size for Higher ODR Values- STEVAL-IDP005V1 - Condition Monitoring?

[KChin.7]

In STEVAL-IDP005V1 - Condition Monitoring, I have set FFT_SIZE_MAX as 2048. Instead of ISM330DLC, i am using Higher ODR Acceleration sensor. As FFT step size( Delta f) is directly proportional to ODR, i am unable to get lower FFT step size( Like 0.5Hz) for higher ODR values.

[Ozone]

The size of 2048 was (is?) the maximal size implemented in ARM's DSP package the FFT code is obviously based on. I didn't check recently, though.

You might investigate alternative FFT implementations.