About Shinicy99

Hello everyone, as i read in other topic on this forum i am also struggling to use BMI270 sensor, especially for initialization process. I'm using nRF52840 SoC and i connected it to the IMU by using twi/i2c intarface.  Here i attach my code for initialization: //INIT FUNCTION FOR BMI270 bool BMI270_init(void) { bool init_succ=true; //following datasheet if(!BMI270_verify_product_id()) { init_succ=false; } if(!BMI270_register_write(0x7C,0x00)) { init_succ=false; } nrf_delay_us(800); if(!BMI270_register_write(0x59,0x00)) { init_succ=false; } // load configuration file from github repo while(BMI270_conf_file_init()) {} if(!BMI270_register_write(0x59,0x01)){ init_succ=false;// it seems that main problem is in this step } return init_succ; }  and these are the code for writing and reading registers: bool BMI270_register_write(uint8_t register_address , uint8_t value) { ret_code_t err_code; uint8_t tx_buff[BMI2_ADDRESS_LEN+1]; tx_buff[0]=register_address; tx_buff[1]=value; m_xfer_done=false; //transimt data err_code=nrf_drv_twi_tx(&m_twi,BMI2_I2C_PRIM_ADDR,tx_buff,BMI2_ADDRESS_LEN+1,false); while(m_xfer_done==false) { } if(err_code != NRF_SUCCESS) { return false; } return true; } bool BMI270_register_read(uint8_t register_address,uint8_t *destination,uint8_t number_of_bytes) { ret_code_t err_code; //flag for check receive m_xfer_done=false; //writing address we want to read err_code=nrf_drv_twi_tx(&m_twi,BMI2_I2C_PRIM_ADDR,&register_address,1,true); while(m_xfer_done==false){} if(err_code != NRF_SUCCESS) { return false; } m_xfer_done=false; //read data err_code=nrf_drv_twi_rx(&m_twi,BMI2_I2C_PRIM_ADDR,destination,number_of_bytes); while(m_xfer_done==false){} if(err_code != NRF_SUCCESS) { return false; } return true; } For burst write the config file i wrote an external function that rewrite on i2c bus the byte from config file: bool BMI270_conf_file_init(void) { uint8_t buff[2]; int a; ret_code_t err_code; for(a=0;a<(sizeof(bmi270_context_config_file)-1);a++) { buff[0]=0x5E; buff[1]=bmi270_context_config_file[a]; err_code=nrf_drv_twi_tx(&m_twi,BMI2_I2C_PRIM_ADDR,buff,2,true); while(m_xfer_done==false){} if(err_code != NRF_SUCCESS) { return false; } } buff[0]=0x5E; buff[1]=bmi270_context_config_file[sizeof(bmi270_context_config_file)-1]; err_code=nrf_drv_twi_tx(&m_twi,BMI2_I2C_PRIM_ADDR,buff,2,false); while(m_xfer_done==false){} if(err_code != NRF_SUCCESS) { return false; } return true; }  The fact is that as i commented in the first code the initialization works until the last step where the function give me a false, also by bypassing that return false, it seems that reading the 0x5E register at the end of initialization the value does not correspond to the last byte of bmi270_context_config_file. I know that are present on the github the API's for this sensor but i didn't understand how i can replace my writing and reading function to implement it. Is there any way to overcome initialization burst write? And if it's not possible, how can i solve it?   PS: these are the declaration of the type fucntion used to write and read using twi of the SoC: //reading function ret_code_t nrf_drv_twi_rx ( nrf_drv_twi_t const * p_instance, uint8_t address, uint8_t * p_data, uint8_t length ) //writing function ret_code_t nrf_drv_twi_tx ( nrf_drv_twi_t const * p_instance, uint8_t address, uint8_t const * p_data, uint8_t length, bool no_stop ) ... View more