Hello mgchoi,
BMI323 didn't support free fall feature.
BMI270 supports free fall feature, you can find this feature in BMI270 Legacy firmware version.
BMI270 Legacy
- Any motion, No motion, Significant motion detector
- Orientation detector (Advanced Potrait-Landscape)
- High-G, Low-G (Freefall) detector
- Flat detector
- Tap detection (Single, Double, Triple taps)
- Smartphone Step counter and Step detector (Pedometer)
- Activity change recognition
