The calibration profile restore are expected when sensor is after soft reset or power on reset.  When sensor is working, the fusion lib is working properly,  write to the calibration parameters are not recommed or even i will say not allowed  because the offset value with current caculation will be broken by your write.   The calibration level drop during sensor run is expected if any distortion on magnetic field or offset change from sensor due to any reason will cause the calibration level drop from 3.  And a recalibration process are running in background to bring it back to 3.  No user interaction needed here on SW side.  Just require some movement to calibrate the magnetic sensor here.   ... View more

I'm sorry.  I can take this advice to your UI team.  But in current situation,  you need to use our API to get sensor data on your board ... View more

Hi A seperate note here: in case you don't want to spend too much time on debugging the i2c communication issues, a much easier way is to use an Arduino board to work with BME680 sensor. The key is that every Arduino board uses the same APIs for I2C communication and this abstraction make it much more consistent and easier to get started. Once you have the Arduino board, you could refer to example made available by Adafruit here: https://github.com/adafruit/Adafruit_BME680 specifically the source code https://github.com/adafruit/Adafruit_BME680/blob/master/Adafruit_BME680.cpp contains a working example of how the read/write are setup by wrapping around the Arduino I2C APIs. `` bool Adafruit_BME680::begin(uint8_t addr, bool initSettings) { _i2caddr = addr; if (_cs == -1) { // i2c _wire->begin(); gas_sensor.dev_id = addr; gas_sensor.intf = BME680_I2C_INTF; gas_sensor.read = &i2c_read; gas_sensor.write = &i2c_write; } `` } `` I used this, and it works like a breeze. Hope this helps.               ... View more