Hello, I'm using the BMX055 in a company's project. I read the data using the bma2x2_driver, bmg160_driver and bmm150_sensor_api for ACC, GYRO and MAG respectively. The data coming from ACC and DATA seem to be fine, whereas the data from the MAG doesn't seem relyable. As a preliminary test I'm using the smartphone compass to detect the North, in order to compare it with the result I get from the BMX055. Since the results are very different and the readings from the BMX055 are varying over time I tried to perform a self test: - the normal test completes successfully - the advanced test always fails (I used 3 different boards) Here is a snipped of my code: static   struct   bmm150_dev   dev ;   s8  initMAG ( void ) {     s8 ret  =  BMM150_OK;      /* Sensor interface over I2C */      dev . dev_id   =  BMM150_DEFAULT_I2C_ADDRESS;      dev . intf   =  BMM150_I2C_INTF;      dev . read   =  user_i2c_read;      dev . write   =  user_i2c_write;      dev . delay_ms   =  user_delay_ms;          ret  =   bmm150_init ( & dev);      if (ret  !=   0 ) {          ESP_LOGE (TAG_IMU,  "Error initializing the magnetometer. Error code: %d" , ret);     }          ret  +=   perform_mag_self_tests ();      /* Setting the power mode as normal */      dev . settings . pwr_mode   =  BMM150_NORMAL_MODE;     ret  +=   bmm150_set_op_mode ( & dev);           /* Setting the preset mode as Low power mode      i.e. data rate = 10Hz XY-rep = 1 Z-rep = 2*/      dev . settings . preset_mode   =  BMM150_PRESETMODE_REGULAR;     ret  +=   bmm150_set_presetmode ( & dev);           return  ret;  }   where: int8_t   perform_mag_self_tests ( void ) {      int8_t  rslt;      /* Perform Normal Self test */     rslt  =   bmm150_perform_self_test (BMM150_NORMAL_SELF_TEST,  & dev);      ESP_LOGI (TAG_IMU,  "NORMAL SELF TEST RESULT :  %d" , rslt);           /* Validate normal self test result */      if  (rslt  ==  BMM150_OK) {          ESP_LOGI (TAG_IMU,  "Normal Self test passed" );     }  else  {          ESP_LOGE (TAG_IMU,  "Normal Self test failed" );     }      /* Perform Advanced Self test */     rslt  |=   bmm150_perform_self_test (BMM150_ADVANCED_SELF_TEST,  & dev);      ESP_LOGI (TAG_IMU,  "ADVANCED SELF TEST RESULT :  %d" , rslt);      /* Validate Advanced self test result */      if  (rslt  ==  BMM150_OK) {          ESP_LOGI (TAG_IMU,  "Advanced Self test passed" );     }  else  {          ESP_LOGE (TAG_IMU,  "Advanced Self test failed" );     }           return  rslt; }     Could you please help me identifying the problem?   Thank you! ... View more

Hello, I'm using the BMX055 IMU in an accessory for motorcycles. I started testing the IMU in our first prototype and I'm successfully able to read the data of ACC, GYRO and MAG via I2C.  However there are a couple of things that are not so clear to me: 1) I followed the procedure for the ACC fast compensation described at page 31-32 of the datasheet, that is:      - set the g range to 2g (write 0x03 in register ACC 0x0F)      -  Set offset target for x, y and z, that in my case are x=0, y=0 and z=1g (write 0x20 in register ACC 0x37)      - Launch the calibration for x, y and z, that is, write in register ACC 0x36 the value 0x20, 0x40, 0x50, respectively  but it seems that it has no effect. Am I doing something wrong? 2) I'm not sure how to interpret the X, Y, Z and RHALL data of the MAG for a compass-like application. Is there any data processing/compensation I need to do? I took a look at some drivers/APIs on GitHub and I noiticed that there is a compensation. The thing is that the registers used to get the compensation values appear to be marked as "reserved" on the datasheet. Could you please clarify that? Thank you in  advance!     ... View more