Hi Huang Mingke,
Please download FRDM-FXS-MULT2-B lib from this link:
Freescale Sensor Fusion Library for Kinetis MCUs
After you download and install it, you will find the according code from the install path.
Please refer to XSFLK_UG.pdf in folder: FRDM-FXS-9AXIS\docs, chapter 2 Quick Start Guides.
This pdf told you how to start the Freescale Sensor Fusion for Kinetis FRDM board.
Wish it helps you!
Have a great day,
Kerry
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