Hi @JQiu.1 , about your questions:
>> Is there a specific operation process document or code?
I suggest you to check the application note AN5296, p.18, where the startup sequence in terms of register values to be written is described. Moreover, there are some online available C examples and drivers on the Github repository: here the LINK for ASM330LHH device.
>> How to calculate the accelerometer offset register?
The register is described in the AN5296, p.21:
4.6 Accelerometer offset registers
The device provides accelerometer offset registers (X_OFS_USR, Y_OFS_USR, Z_OFS_USR) which can be used for zero-g offset correction or, in general, to apply an offset to the accelerometer output data. The accelerometer offset block can be enabled by setting the USR_OFF_ON_OUT bit of the CTRL7_G register. The offset value set in the offset registers is internally subtracted from the measured acceleration value for the respective axis; internally processed data are then sent to the accelerometer output register and to the FIFO (if enabled).
These register values are expressed as an 8-bit word in two’s complement and must be in the range [-127, 127].
The weight [g/LSB] to be applied to the offset register values is independent of the accelerometer selected full scale and can be configured using the USR_OFF_W bit of the CTRL6_C register:
- 2-10 g/LSB if the USR_OFF_W bit is set to 0;
- 2 -6 g/LSB if the USR_OFF_W bit is set to 1.
Regards
