How to use DMP of MPU9250 via SPI?

By jcepzdrgmailcom , 7 March 2022

Hi, I'm new here and this is my first post.

Now I'm trying to use DMP (only 6 axis Quaternion) via SPI on Arduino framework.
Though I succeeded in reading WHO_AM_I register and getting 0x71,
I can't read Quaternion value from FIFO register.

I'm supposed to follow Application Note Document correctly,
but there might be some mistake.

I can't determine whether this trouble is due to mistake of setting up DMP, or other factors.

Here's my code.

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