About GMASCIARDT

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