void measure(struct bme280_t * sens)
{
s32 temp;
bme280_read_uncomp_temperature(sens, &temp);
s32 tempc = bme280_compensate_temperature_int32(sens, temp);
transmit_decimal(tempc);
bme280_read_uncomp_humidity(sens, &temp);
tempc = bme280_compensate_humidity_int32(sens, temp);
transmit_decimal(tempc>>10);
}
OSStatus bme280_read_temperature(s32 *v_actual_temp_s32)
{
s32 com_rslt = BME280_ERROR; // result of communication results
s32 v_data_uncomp_tem_s32 = BME280_INIT_VALUE; // uncompensated temperature
//-------------------------- NOTE ----------------------------------
// this is to avoid i2c pin is re-init by other module because they use the same pin.
MicoI2cInitialize(&user_i2c_device);
//------------------------------------------------------------------
com_rslt = bme280_read_uncomp_temperature(&v_data_uncomp_tem_s32);
if(0 != com_rslt){
return kReadErr;
}
*v_actual_temp_s32 = bme280_compensate_temperature_int32(v_data_uncomp_tem_s32);
return kNoErr;
}
/* This function is an example for reading sensor data
* \param: None
* \return: communication result
*/
s32 bme280_data_readout_template(void)
{
/* The variable used to assign the standby time*/
u8 v_stand_by_time_u8 = BME280_INIT_VALUE;
/* The variable used to read uncompensated temperature*/
s32 v_data_uncomp_tem_s32 = BME280_INIT_VALUE;
/* The variable used to read uncompensated pressure*/
s32 v_data_uncomp_pres_s32 = BME280_INIT_VALUE;
/* The variable used to read uncompensated pressure*/
s32 v_data_uncomp_hum_s32 = BME280_INIT_VALUE;
/* The variable used to read real temperature*/
s32 v_actual_temp_s32 = BME280_INIT_VALUE;
/* The variable used to read real pressure*/
u32 v_actual_press_u32 = BME280_INIT_VALUE;
/* The variable used to read real humidity*/
u32 v_actual_humity_u32 = BME280_INIT_VALUE;
/* result of communication results*/
s32 com_rslt = BME280_ERROR;
/*********************** START INITIALIZATION ************************/
/* Based on the user need configure I2C or SPI interface.
* It is example code to explain how to use the bme280 API*/
#ifdef BME280_API
I2C_routine();
/*SPI_routine(); */
#endif
/*--------------------------------------------------------------------------*
* This function used to assign the value/reference of
* the following parameters
* I2C address
* Bus Write
* Bus read
* Chip id
*-------------------------------------------------------------------------*/
com_rslt = bme280_init(&bme280);
/* For initialization it is required to set the mode of
* the sensor as "NORMAL"
* data acquisition/read/write is possible in this mode
* by using the below API able to set the power mode as NORMAL*/
/* Set the power mode as NORMAL*/
com_rslt += bme280_set_power_mode(BME280_NORMAL_MODE);
/* For reading the pressure, humidity and temperature data it is required to
* set the OSS setting of humidity, pressure and temperature
* The "BME280_CTRLHUM_REG_OSRSH" register sets the humidity
* data acquisition options of the device.
* changes to this registers only become effective after a write operation to
* "BME280_CTRLMEAS_REG" register.
* In the code automated reading and writing of "BME280_CTRLHUM_REG_OSRSH"
* register first set the "BME280_CTRLHUM_REG_OSRSH" and then read and write
* the "BME280_CTRLMEAS_REG" register in the function*/
com_rslt += bme280_set_oversamp_humidity(BME280_OVERSAMP_1X);
/* set the pressure oversampling*/
com_rslt += bme280_set_oversamp_pressure(BME280_OVERSAMP_2X);
/* set the temperature oversampling*/
com_rslt += bme280_set_oversamp_temperature(BME280_OVERSAMP_4X);
/*--------------------------------------------------------------------------*/
/*------------------------------------------------------------------------*
************************* START GET and SET FUNCTIONS DATA ****************
*---------------------------------------------------------------------------*/
/* This API used to Write the standby time of the sensor input
* value have to be given
* Normal mode comprises an automated perpetual cycling between an (active)
* Measurement period and an (inactive) standby period.
* The standby time is determined by the contents of the register t_sb.
* Standby time can be set using BME280_STANDBYTIME_125_MS.
* Usage Hint : bme280_set_standbydur(BME280_STANDBYTIME_125_MS)*/
com_rslt += bme280_set_standby_durn(BME280_STANDBY_TIME_1_MS);
/* This API used to read back the written value of standby time*/
com_rslt += bme280_get_standby_durn(&v_stand_by_time_u8);
/*-----------------------------------------------------------------*
************************* END GET and SET FUNCTIONS ****************
*------------------------------------------------------------------*/
/************************* END INITIALIZATION *************************/
/*------------------------------------------------------------------*
************ START READ UNCOMPENSATED PRESSURE, TEMPERATURE
AND HUMIDITY DATA ********
*---------------------------------------------------------------------*/
/* API is used to read the uncompensated temperature*/
com_rslt += bme280_read_uncomp_temperature(&v_data_uncomp_tem_s32);
/* API is used to read the uncompensated pressure*/
com_rslt += bme280_read_uncomp_pressure(&v_data_uncomp_pres_s32);
/* API is used to read the uncompensated humidity*/
com_rslt += bme280_read_uncomp_humidity(&v_data_uncomp_hum_s32);
/* API is used to read the uncompensated temperature,pressure
and humidity data */
com_rslt += bme280_read_uncomp_pressure_temperature_humidity(
&v_data_uncomp_tem_s32, &v_data_uncomp_pres_s32, &v_data_uncomp_hum_s32);
/*--------------------------------------------------------------------*
************ END READ UNCOMPENSATED PRESSURE AND TEMPERATURE********
*-------------------------------------------------------------------------*/
/*------------------------------------------------------------------*
************ START READ TRUE PRESSURE, TEMPERATURE
AND HUMIDITY DATA ********
*---------------------------------------------------------------------*/
/* API is used to read the true temperature*/
/* Input value as uncompensated temperature and output format*/
com_rslt += bme280_compensate_temperature_int32(v_data_uncomp_tem_s32);
/* API is used to read the true pressure*/
/* Input value as uncompensated pressure */
com_rslt += bme280_compensate_pressure_int32(v_data_uncomp_pres_s32);
/* API is used to read the true humidity*/
/* Input value as uncompensated humidity and output format*/
com_rslt += bme280_compensate_humidity_int32(v_data_uncomp_hum_s32);
/* API is used to read the true temperature, humidity and pressure*/
com_rslt += bme280_read_pressure_temperature_humidity(
&v_actual_press_u32, &v_actual_temp_s32, &v_actual_humity_u32);
/*--------------------------------------------------------------------*
************ END READ TRUE PRESSURE, TEMPERATURE AND HUMIDITY ********
*-------------------------------------------------------------------------*/
/*-----------------------------------------------------------------------*
************************* START DE-INITIALIZATION ***********************
*-------------------------------------------------------------------------*/
/* For de-initialization it is required to set the mode of
* the sensor as "SLEEP"
* the device reaches the lowest power consumption only
* In SLEEP mode no measurements are performed
* All registers are accessible
* by using the below API able to set the power mode as SLEEP*/
/* Set the power mode as SLEEP*/
com_rslt += bme280_set_power_mode(BME280_SLEEP_MODE);
/*---------------------------------------------------------------------*
************************* END DE-INITIALIZATION **********************
*---------------------------------------------------------------------*/
return com_rslt;
}