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FYI..... but still thanks pointing me to the issue.   ... View more

Hey BSTRobin  thank you very much, It seems as the issue was the spi mode {CPOL, CPHA}.   Best Regards ... View more

Hey BSTRobin   Seems as I'm using a diffent ref code, what ref code are you using? the goal is similar. In the ref code I got from:https://github.com/BoschSensortec/BMI270-Sensor-API 1) in bmi207.c there's a method int8_t bmi270_init(struct bmi2_dev *dev) That is the method im useing. /*! * @brief This API: * 1) updates the device structure with address of the configuration file. * 2) Initializes BMI270 sensor. * 3) Writes the configuration file. * 4) Updates the feature offset parameters in the device structure. * 5) Updates the maximum number of pages, in the device structure. */ int8_t bmi270_init(struct bmi2_dev *dev) { /* Variable to define error */ int8_t rslt; /* Null-pointer check */ rslt = null_ptr_check(dev); if (rslt == BMI2_OK) { /* Assign chip id of BMI270 */ dev->chip_id = BMI270_CHIP_ID; /* get the size of config array */ dev->config_size = sizeof(bmi270_config_file); /* Enable the variant specific features if any */ dev->variant_feature = BMI2_GYRO_CROSS_SENS_ENABLE | BMI2_CRT_RTOSK_ENABLE; /* An extra dummy byte is read during SPI read */ if (dev->intf == BMI2_SPI_INTF) { dev->dummy_byte = 1; } else { dev->dummy_byte = 0; } /* If configuration file pointer is not assigned any address */ if (!dev->config_file_ptr) { /* Give the address of the configuration file array to * the device pointer */ dev->config_file_ptr = bmi270_config_file; } /* Initialize BMI2 sensor */ rslt = bmi2_sec_init(dev); if (rslt == BMI2_OK) { /* Assign the offsets of the feature input * configuration to the device structure */ dev->feat_config = bmi270_feat_in; /* Assign the offsets of the feature output to * the device structure */ dev->feat_output = bmi270_feat_out; /* Assign the maximum number of pages to the * device structure */ dev->page_max = BMI270_MAX_PAGE_NUM; /* Assign maximum number of input sensors/ * features to device structure */ dev->input_sens = BMI270_MAX_FEAT_IN; /* Assign maximum number of output sensors/ * features to device structure */ dev->out_sens = BMI270_MAX_FEAT_OUT; /* Get the gyroscope cross axis sensitivity */ rslt = bmi2_get_gyro_cross_sense(dev); } } return rslt; } before calling bmi207_init(sturct bmi2_dev* dev), I'm calling bmi2_interface_selection(struct bmi2_dev *dev) with the following code: int8_t bmi2_interface_selection(struct bmi2_dev *dev) { int8_t rslt = BMI2_OK; if (dev != NULL) { /* Select the interface for execution * For I2C : BMI2_I2C_INTF * For SPI : BMI2_SPI_INTF */ dev->intf = BMI2_SPI_INTF; /* Bus configuration : I2C */ if (dev->intf == BMI2_I2C_INTF) { printf("I2C Interface \n"); /* To initialize the user I2C function */ bmi2_user_i2c_init(); dev_addr = BMI2_I2C_PRIM_ADDR; dev->read = user_i2c_reg_read; dev->write = user_i2c_reg_write; } /* Bus configuration : SPI */ else if (dev->intf == BMI2_SPI_INTF) { printf("SPI Interface \n"); /* To initialize the user SPI function */ bmi2_user_spi_init(); dev_addr = 0; dev->read = user_spi_reg_read; dev->write = user_spi_reg_write; } /* Assign device address to interface pointer */ dev->intf_ptr = &dev_addr; /* Configure delay in microseconds */ dev->delay_us = user_delay_us; /* Configure max read/write length (in bytes) ( Supported length depends on target machine) */ dev->read_write_len = SPI_BUFF_SZ;// - 1;//8; /* Assign to NULL to load the default config file. */ dev->config_file_ptr = NULL; } else { rslt = BMI2_E_NULL_PTR; } return rslt; }   this might give a better picture: /* Status of api are returned to this variable. */ int8_t rslt; //uint8_t tmpReg_data[3]; /*! Sensor initialization configuration. */ struct bmi2_dev bmi2_device; CS7 = 1; set_SPI270_5mhz(); /* Initialize the dev structure */ rslt = bmi2_interface_selection(&bmi2_device); bmi2_error_codes_print_result(rslt); /* Initialize bmi270. */ rslt = bmi270_init(&bmi2_device); bmi2_error_codes_print_result(rslt);   2) I dont have a bmi270_wh_init(dev) method. ... View more