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Can't access magnetometer output #18

@nux1701

Description

@nux1701

Describe the bug
Hello,

I've been strugling with a second MPU9250 I bought after thinking the first one might be defective, I can't get any reading from the magnetometer on my Raspberry.
I connected the VCC to 3.3V, SDA + SCL and GND accordingly.

i2cdetect -y 1 only shows 0x68 address, no magnetometer address.
I've seen that I might need to change a register to allow some I2C pass through, but I thought this library might do it on its own.

Do I need to do something on my own or set something up on my top-level script to address this issue ?

Thank you for your help.

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