How to set up LSM303AGR for accelerometer measurements?

The register CTRL_REG1_A is set with 0x57 and CTRL_REG4_A with 0x80.

All output Accelerometer registers give the same value 0xC0.

What is missing for correct accelerometer measurements?

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ST Employee

You can use the platform independent drivers available in GitHub:

There is also example for basic sensor setup and data reading.

For more details please read application note AN4825:

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