Question - Why (on the leftmost type of breakout board in the readme image) is SCL and SDA used for SPI?

[kaptsanovb]

Aren't SCL, SDA I2C pins? Why aren't SCx and SDx used specifcally on that board? I looked at this datasheet, and on the 4-pin SPI connection it shows:

(Acc -> Board)
SDO (Im guessing SAO on my board) -> MISO
SDX -> MOSI
SCX -> SCK
CSB (CS) -> CSB (CS)

I did try to connect it through SCX and SDX, but that didn't work.

[jacks1916]

My board is same as yours. MOSI and SCK should be connected to SDA and SCL on the board.
From the data sheet, "Primary I2C and secondary magnetometer interface (I2C)" diagram is seems like same as my board.
So SDX and SCX pins are actually ASDx and ASCx for secondaary magnetmeter interface.