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f1d8ab09ca
bme680-driver-fork/bme680.c
nagarajan f1d8ab09ca BME680 driver release
2016-06-22 17:53:09 +05:30

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/** \mainpage
****************************************************************************
* Copyright (C) 2015 Bosch Sensortec GmbH
*
* File : bme680.c
*
* Date : 2016/06/10
*
* Revision: 2.0.0
*
* Usage: Sensor Driver for BME680 sensor
*
****************************************************************************
* Section Disclaimer
*
* License:
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* Neither the name of the copyright holder nor the names of the
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDER
* OR CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
* OR CONSEQUENTIAL DAMAGES(INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE
*
* The information provided is believed to be accurate and reliable.
* The copyright holder assumes no responsibility
* for the consequences of use
* of such information nor for any infringement of patents or
* other rights of third parties which may result from its use.
* No license is granted by implication or otherwise under any patent or
* patent rights of the copyright holder.
**************************************************************************/
/*! \file bme680.c
\brief BME680 Sensor Driver Support source File */
/***************************************************************************
Header files
****************************************************************************/
#include "bme680.h"
#include "bme680_calculations.h"
#include "bme680_internal.h"
/***************************************************************************
Macros, Enums, Constants
****************************************************************************/
/***************************************************************************
File globals, typedefs
****************************************************************************/
/* Static function declarations */
static enum bme680_return_type bme680_get_calib_param(struct bme680_t *bme680);
static void bme680_scale_to_multiplication_factor(u16 *duration_u16);
#ifndef __KERNEL__
static void bme680_buffer_restruct_burst_write(u8 arr[], u8 reg_addr,
u8 data_size, u8 arr_size);
#endif
static u8 bme680_find_largest_index(u8 *meas_index);
static enum bme680_return_type bme680_set_memory_page(u8 memory_page_u8,
struct bme680_t *bme680);
static void bme680_align_sensor_type_uncomp_data(u8 *a_data_u8, u8 index,
u8 offset, u8 sensor_type,
struct bme680_uncomp_field_data *uncomp_data);
static void bme680_packing_calib_param(u8 *a_data_u8, struct bme680_t *bme680);
static void bme680_copy_ordered_sensor_field_data(
struct bme680_uncomp_field_data *sensor_data,
u8 latest, u8 recent, u8 old, u8 sensor_type,
struct bme680_uncomp_field_data *temp_sensor_data);
static void bme680_get_latest_recent_old_field_index(
struct bme680_uncomp_field_data *sensor_data,
struct bme680_t *bme680);
#ifdef BME680_SPECIFIC_FIELD_DATA_READ_ENABLED
static enum bme680_return_type bme680_get_field_specific_uncomp_data(
u8 field_index, u8 sensor_type, u8 *a_data_u8, struct bme680_t *bme680);
static enum bme680_return_type bme680_Temp_field_specific_uncomp_read(
u8 field_index, u8 *a_data_u8, struct bme680_t *bme680);
static enum bme680_return_type bme680_Pressure_field_specific_uncomp_read(
u8 field_index, u8 *a_data_u8, struct bme680_t *bme680);
static enum bme680_return_type bme680_Humidity_field_specific_uncomp_read(
u8 field_index, u8 *a_data_u8, struct bme680_t *bme680);
static enum bme680_return_type bme680_Gas_field_specific_uncomp_read(
u8 field_index, u8 *a_data_u8, struct bme680_t *bme680);
#endif
/***************************************************************************
Function definitions
****************************************************************************/
/*!
* @brief This function is used to read the
* the chip id and calibration data of the BME680 sensor
* chip id is read in the register 0xD0/0x50(I2C/SPI) from bit 0 to 7
*
* @param bme680 structure pointer.
*
* @note Structure with the below data to be filled
* before passing to this function.
* @note Device address( applicable only for I2C, bypassed for SPI)
* @note Bus interface functions.
* @note Delay function
* @note With the above data properly set, Chip id will be read from the sensor
*
* @note While changing the parameter of the bme680_t
* @note consider the following point:
* Changing the reference value of the parameter
* will change the local copy or local reference
* make sure your changes will not
* affect the reference value of the parameter
* (Better case don't change the reference value of the parameter)
*
*
*
*
* @return Either the results of bus communication status or
* chip_id fail status
* @retval 0 -> Success both bus communication & chip_id
* @retval any negative value -> Bus communication failed
* -4 -> chip_id corrupted and bus communication ok
*
*
*/
enum bme680_return_type bme680_init(struct bme680_t *bme680)
{
/* used to return the communication result*/
enum bme680_return_type com_status = BME680_COMM_RES_ERROR;
u8 data_u8 = BME680_INIT_VALUE;
/* assign the pointer*/
if (BME680_SPI_INTERFACE == bme680->interface) {
/*SPI address 0x45*/
/* read the chip id*/
com_status = (enum bme680_return_type)bme680->bme680_bus_read(
bme680->dev_addr,
BME680_PAGE0_SPI_ID_REG,
&data_u8,
BME680_GEN_READ_DATA_LENGTH);
} else if (BME680_I2C_INTERFACE == bme680->interface) {
/* read the chip id*/
com_status = (enum bme680_return_type)bme680->bme680_bus_read(
bme680->dev_addr,
BME680_PAGE0_I2C_ID_REG,
&data_u8,
BME680_GEN_READ_DATA_LENGTH);
}
bme680->chip_id = data_u8;
if (BME680_COMM_RES_OK == com_status) {
if (BME680_CHIP_ID == bme680->chip_id) {
/* read the calibration values*/
com_status = bme680_get_calib_param(bme680);
} else {
com_status = BME680_CHIP_ID_ERROR;
}
}
return com_status;
}
/*!
* @brief This function is used to retrieve the calibration
* data from the image registers of the sensor.
*
* @note Registers 8Ah to A1h for calibration data 1 to 24
* from bit 0 to 7
* @note Registers E1h to F0h for calibration data 25 to 40
* from bit 0 to 7
* @param bme680 structure pointer.
* @return results of bus communication function
* @retval 0 -> Success
* @retval any negative value -> Error
*
*
*/
static enum bme680_return_type bme680_get_calib_param(struct bme680_t *bme680)
{
/* used to return the communication result*/
enum bme680_return_type com_status = BME680_COMM_RES_ERROR;
/* array of data holding the calibration values*/
u8 v_data_u8 = BME680_INIT_VALUE;
u8 a_data_u8[BME680_CALIB_PARAM_SIZE];
u8 index = BME680_INIT_VALUE;
for (; index < BME680_CALIB_PARAM_SIZE; index++)
a_data_u8[index] = BME680_INIT_VALUE;
/* check the bme680 structure pointer as NULL*/
if (BME680_NULL_PTR == bme680) {
com_status = BME680_ERROR_NULL_PTR;
} else {
if (BME680_SPI_INTERFACE == bme680->interface) {
/* memory page switch the SPI address*/
com_status = bme680_set_memory_page(
BME680_PAGE0_INTERFACE_SPI, bme680);
if (BME680_COMM_RES_OK == com_status) {
/* read the pressure and temperature
calibration data*/
com_status = (enum bme680_return_type)
bme680->bme680_bus_read(
bme680->dev_addr,
BME680_CALIB_SPI_ADDR_1,
a_data_u8,
BME680_CALIB_DATA_LENGTH_GAS);
/* read the humidity and gas
calibration data*/
com_status = (enum bme680_return_type)
bme680->bme680_bus_read(
bme680->dev_addr,
BME680_CALIB_SPI_ADDR_2,
(a_data_u8 +
BME680_CALIB_DATA_LENGTH_GAS),
BME680_CALIB_DATA_LENGTH);
}
} else if (BME680_I2C_INTERFACE == bme680->interface) {
/* read the pressure and temperature
calibration data*/
com_status = (enum bme680_return_type)
bme680->bme680_bus_read(
bme680->dev_addr,
BME680_CALIB_I2C_ADDR_1,
a_data_u8,
BME680_CALIB_DATA_LENGTH_GAS);
/* read the humidity and gas
calibration data*/
com_status = (enum bme680_return_type)
bme680->bme680_bus_read(
bme680->dev_addr,
BME680_CALIB_I2C_ADDR_2,
(a_data_u8 +
BME680_CALIB_DATA_LENGTH_GAS),
BME680_CALIB_DATA_LENGTH);
} else {
com_status = BME680_COMM_RES_ERROR;
}
if (BME680_COMM_RES_OK == com_status) {
/*read TPGH calibration*/
bme680_packing_calib_param(a_data_u8, bme680);
if (BME680_SPI_INTERFACE == bme680->interface) {
/* memory page switch the SPI address*/
com_status = bme680_set_memory_page(BME680_PAGE1_INTERFACE_SPI,
bme680);
}
com_status = (enum bme680_return_type)bme680->bme680_bus_read(
bme680->dev_addr,
BME680_ADDR_RES_HEAT_RANGE,
&v_data_u8,
BME680_GEN_READ_DATA_LENGTH);
bme680->cal_param.res_heat_range = BME680_GET_REG(v_data_u8,
BME680_MASK_RES_HEAT_RANGE,
BME680_SHIFT_RES_HEAT_RANGE);
com_status = (enum bme680_return_type)bme680->bme680_bus_read(
bme680->dev_addr,
BME680_ADDR_RES_HEAT_VAL,
&v_data_u8,
BME680_GEN_READ_DATA_LENGTH);
bme680->cal_param.res_heat_val = v_data_u8;
com_status = (enum bme680_return_type)bme680->bme680_bus_read(
bme680->dev_addr,
BME680_ADDR_RANGE_SWITCHING_ERR,
&v_data_u8,
BME680_GEN_READ_DATA_LENGTH);
bme680->cal_param.range_switching_error = BME680_GET_REG(
(s8)v_data_u8,
(s8)BME680_MASK_RANGE_ERR,
BME680_SHIFT_RANGE_ERR);
}
}
return com_status;
}
/*!
* @brief This function is used to write the data to
* the given register
*
*
* @param addr_u8 -> Address of the register
* @param data_u8 -> The data to write to the register
* @param len_u8 -> No of bytes to write
* @param bme680 structure pointer.
*
*
* @return results of bus communication function
* @retval 0 -> Success
* @retval any negative value -> Error
*
*
*/
enum bme680_return_type bme680_write_reg(u8 addr_u8, u8 *data_u8, u8 len_u8,
struct bme680_t *bme680)
{
/* used to return the communication result*/
enum bme680_return_type com_status = BME680_COMM_RES_ERROR;
/* check the bme680 is NULL pointer */
if (BME680_NULL_PTR == bme680) {
com_status = BME680_ERROR_NULL_PTR;
} else {
com_status = (enum bme680_return_type)bme680->bme680_bus_write(
bme680->dev_addr,
addr_u8,
data_u8,
len_u8);
}
return com_status;
}
/*!
* @brief This function is used to reads the data from
* the given register
*
*
* @param addr_u8 -> Address of the register
* @param data_u8 -> Pointer to store the
* received data from the register
* @param len_u8 -> No of bytes to read
* @param bme680 structure pointer.
*
*
* @return results of bus communication function
* @retval 0 -> Success
* @retval any negative value -> Error
*
*
*/
enum bme680_return_type bme680_read_reg(u8 addr_u8, u8 *data_u8, u8 len_u8,
struct bme680_t *bme680)
{
/* used to return the communication result*/
enum bme680_return_type com_status = BME680_COMM_RES_ERROR;
/* check the bme680 is NULL pointer */
if (BME680_NULL_PTR == bme680) {
com_status = BME680_ERROR_NULL_PTR;
} else {
com_status = (enum bme680_return_type)
bme680->bme680_bus_read(bme680->dev_addr,
addr_u8,
data_u8,
len_u8);
}
return com_status;
}
/*!
* @brief This function is used to read the new data0
* @note Field-0(new_data_0),
* Field-1(new_data_1) and Field-2(new_data_2)
* @note Page-1
*
*
* @param new_data_u8: The value of new data
* @param field_u8: The value of field selection for new data
* field | value
* -----------|-------------
* 0 | BME680_FIELD_ZERO
* 1 | BME680_FIELD_ONE
* 2 | BME680_FIELD_TWO
*
* field | Register
* -------------------|------------
* BME680_FIELD_ZERO | 0x1D bit 7
* BME680_FIELD_ONE | 0x2E bit 7
* BME680_FIELD_TWO | 0x3F bit 7
*
*
* @param bme680 structure pointer.
*
* @return results of bus communication function
* @retval 0 -> Success
* @retval any negative value -> Error
*
*
*/
enum bme680_return_type bme680_get_new_data(u8 *new_data_u8, u8 field_u8,
struct bme680_t *bme680)
{
/* used to return the communication result*/
enum bme680_return_type com_status = BME680_COMM_RES_ERROR;
/* check the bme680 is NULL pointer */
if (BME680_NULL_PTR == bme680) {
com_status = BME680_ERROR_NULL_PTR;
} else {
if (BME680_SPI_INTERFACE == bme680->interface) {
/* memory page switch the SPI address*/
com_status = bme680_set_memory_page(
BME680_PAGE1_INTERFACE_SPI,
bme680);
}
if (BME680_I2C_INTERFACE == bme680->interface)
com_status = BME680_COMM_RES_OK;
if (BME680_COMM_RES_OK == com_status) {
switch (field_u8) {
case BME680_FIELD_ZERO:
/* read field0 new data zero*/
com_status = (enum bme680_return_type)
bme680->bme680_bus_read(
bme680->dev_addr,
BME680_ADDR_FIELD_0,
new_data_u8,
BME680_GEN_READ_DATA_LENGTH);
break;
case BME680_FIELD_ONE:
/* read field1 new data one*/
com_status = (enum bme680_return_type)
bme680->bme680_bus_read(
bme680->dev_addr,
(BME680_ADDR_FIELD_0 +
BME680_FIELD_ONE_OFFSET),
new_data_u8,
BME680_GEN_READ_DATA_LENGTH);
break;
case BME680_FIELD_TWO:
/* read field2 new data two*/
com_status =
(enum bme680_return_type)
bme680->bme680_bus_read(
bme680->dev_addr,
(BME680_ADDR_FIELD_0 +
BME680_FIELD_TWO_OFFSET),
new_data_u8,
BME680_GEN_READ_DATA_LENGTH);
break;
default:
com_status = BME680_COMM_RES_ERROR;
break;
}
if (BME680_COMM_RES_OK == com_status)
*new_data_u8 = BME680_GET_REG(*new_data_u8,
BME680_MASK_NEW_DATA,
BME680_SHIFT_NEW_DATA);
}
}
return com_status;
}
/*!
* @brief This function is used to read the uncompensated
* sensor data from Field-0, Field-1, Field-2 and page-1
*
* @param uncomp_data:
* Pointer to store the value of uncompensated sensor
* data of pressure, temperature, humidity and gas
*
* @param field_count : total no of field data which needs
* to be read from the sensor
*
* @note:
* field_count = 1 : only latest field data out of 3 fields
* field_count = 2 : latest and recent field data out of 3 field
* field_count = 3 : All 3 latest, recent and old field data
*
* @param sensor_type : Type of sensor
* e.g; BME680_PRESSURE,BME680_TEMPERATURE,BME680_HUMIDITY
* BME680_GAS,BME680_ALL
*
* @note: if "BME680_SPECIFIC_FIELD_DATA_READ_ENABLED" is not defined in
* bme680.h then for any sensor_type function will perform
* read operation for BME680_ALL.
*
* @param bme680 structure pointer.
*
* @return results of bus communication function
* @retval 0 -> Success
* @retval any negative value -> Error
*
* @note error code is returned when data readout is attempted
* in sleep mode or when field_count is not in the below range
* it must be 1<= field_count <= 3
*
*/
enum bme680_return_type bme680_get_uncomp_data(
struct bme680_uncomp_field_data *uncomp_data, u8 field_count,
u8 sensor_type, struct bme680_t *bme680)
{
/* used to return the communication result*/
enum bme680_return_type com_status = BME680_COMM_RES_ERROR;
u8 index = BME680_INIT_VALUE;
u8 a_data_u8[BME680_LEN_ALL_FIELD_SIZE];
struct bme680_uncomp_field_data temp_sensor_data[BME680_THREE];
#ifdef BME680_SPECIFIC_FIELD_DATA_READ_ENABLED
/*Array to store the new_data status of all 3 fields*/
u8 new_data[BME680_THREE] = {BME680_INIT_VALUE, BME680_INIT_VALUE,
BME680_INIT_VALUE};
#endif
/*clear the the latest, recent and old field index*/
bme680->latest_field_index = BME680_INIT_VALUE;
bme680->recent_field_index = BME680_INIT_VALUE;
bme680->old_field_index = BME680_INIT_VALUE;
if ((field_count < BME680_PRESENT_DATA_FIELD
|| field_count > BME680_ALL_DATA_FIELD)
|| (BME680_SLEEP_MODE == bme680->last_set_mode)) {
com_status = BME680_COMM_RES_ERROR;
} else {
com_status = BME680_COMM_RES_OK;
}
if (BME680_COMM_RES_OK == com_status) {
#ifndef BME680_SPECIFIC_FIELD_DATA_READ_ENABLED
sensor_type = BME680_ALL;
field_count = BME680_ALL_DATA_FIELD;
#endif
if (BME680_FORCED_MODE == bme680->last_set_mode) {
com_status = (enum bme680_return_type)
bme680->bme680_bus_read(
bme680->dev_addr,
BME680_ADDR_FIELD_0, a_data_u8,
BME680_SINGLE_FIELD_LENGTH);
field_count = BME680_PRESENT_DATA_FIELD;
} else {
#ifdef BME680_SPECIFIC_FIELD_DATA_READ_ENABLED
/*read status field of all 3 filed and extract the new_data
flag status.*/
com_status = bme680_read_status_fields(uncomp_data, a_data_u8,
new_data, bme680);
/*get the latest, recent and old field index*/
bme680_get_latest_recent_old_field_index(uncomp_data, bme680);
/*By default read latest field data */
if (BME680_TRUE == new_data[bme680->latest_field_index]) {
com_status =
bme680_get_field_specific_uncomp_data(
bme680->latest_field_index,
sensor_type,
a_data_u8,
bme680);
}
if (BME680_PRESENT_AND_PREVIOUS_DATA_FIELD == field_count) {
/* read recent field data */
if (BME680_TRUE ==
new_data[bme680->recent_field_index]) {
com_status =
bme680_get_field_specific_uncomp_data(
bme680->recent_field_index,
sensor_type,
a_data_u8,
bme680);
}
} else if (BME680_ALL_DATA_FIELD == field_count) {
/* read recent field data */
if (BME680_TRUE ==
new_data[bme680->recent_field_index]) {
com_status =
bme680_get_field_specific_uncomp_data(
bme680->recent_field_index,
sensor_type,
a_data_u8,
bme680);
}
/* read old field data */
if (BME680_TRUE ==
new_data[bme680->old_field_index]) {
com_status =
bme680_get_field_specific_uncomp_data(
bme680->old_field_index,
sensor_type,
a_data_u8,
bme680);
}
}
#else
if (BME680_ALL == sensor_type) {
/*read uncompensated sensor data of field 0,1,2*/
com_status = (enum bme680_return_type)
bme680->bme680_bus_read(
bme680->dev_addr,
BME680_ADDR_FIELD_0, a_data_u8,
BME680_LEN_ALL_FIELD_SIZE);
}
(uncomp_data + 0)->status.meas_index = a_data_u8[1];
(uncomp_data + 1)->status.meas_index = a_data_u8[18];
(uncomp_data + 2)->status.meas_index = a_data_u8[35];
/*get the latest, recent and old field index*/
bme680_get_latest_recent_old_field_index(uncomp_data, bme680);
#endif
}
if (BME680_COMM_RES_OK == com_status) {
bme680_align_uncomp_data(a_data_u8,
field_count,
sensor_type,
uncomp_data,
bme680);
if (BME680_FORCED_MODE != bme680->last_set_mode) {
for (index = BME680_INIT_VALUE; index <
BME680_ALL_DATA_FIELD; index++)
temp_sensor_data[index] =
*(uncomp_data + index);
bme680_copy_ordered_sensor_field_data(
uncomp_data, bme680->latest_field_index,
bme680->recent_field_index,
bme680->old_field_index, sensor_type,
temp_sensor_data);
}
}
}
return com_status;
}
#ifdef BME680_SPECIFIC_FIELD_DATA_READ_ENABLED
/*!
* @brief This function is used to read the uncompensated
* data according to sensor type
* @note Field-0, Field-1 and Field-2
* @note Page-1
*
*
* @param field_index : index of the field which needs
* to be read from the sensor
*
* @param sensor_type : Type of sensor
* e.g; BME680_PRESSURE,BME680_TEMPERATURE,BME680_HUMIDITY
* BME680_GAS,BME680_ALL
*
* @param a_data_u8 : pointer to store read data.
* @param bme680 structure pointer.
*
* @return results of bus communication function
* @retval 0 -> Success
* @retval any negative value -> Error
*
*
*/
enum bme680_return_type bme680_get_field_specific_uncomp_data(
u8 field_index, u8 sensor_type, u8 *a_data_u8, struct bme680_t *bme680)
{
enum bme680_return_type com_status = BME680_COMM_RES_ERROR;
if (BME680_PRESSURE == sensor_type ||
BME680_TEMPERATURE == sensor_type ||
BME680_HUMIDITY == sensor_type) {
com_status = bme680_Temp_field_specific_uncomp_read(
field_index,
a_data_u8,
bme680);
switch (sensor_type) {
case BME680_PRESSURE:
com_status = bme680_Pressure_field_specific_uncomp_read(
field_index,
a_data_u8,
bme680);
break;
case BME680_HUMIDITY:
com_status = bme680_Humidity_field_specific_uncomp_read(
field_index,
a_data_u8,
bme680);
break;
}
} else if (BME680_GAS == sensor_type) {
com_status = bme680_Gas_field_specific_uncomp_read(field_index,
a_data_u8,
bme680);
} else if (BME680_ALL == sensor_type) {
/*read uncompensated sensor data of field 0,1,2*/
com_status = (enum bme680_return_type)bme680->bme680_bus_read(
bme680->dev_addr,
BME680_ADDR_FIELD_0,
a_data_u8,
BME680_LEN_ALL_FIELD_SIZE);
}
return com_status;
}
/*!
* @brief This function is used to read the uncompensated
* Temperature for specific Field type.
* Field-0, Field-1 and Field-2
*
* @param field_index : index of the field which needs
* to be read from the sensor
*
* @param a_data_u8 : pointer to store read data.
* @param bme680 structure pointer.
*
* @return results of bus communication function
* @retval 0 -> Success
* @retval any negative value -> Error
*
*
*/
enum bme680_return_type bme680_Temp_field_specific_uncomp_read(
u8 field_index, u8 *a_data_u8, struct bme680_t *bme680)
{
enum bme680_return_type com_status = BME680_COMM_RES_ERROR;
/* local buffer length is 5 and it's the maximum */
u8 temp_data_u8[BME680_THREE];
u8 count = BME680_INIT_VALUE;
for (count = BME680_INIT_VALUE; count < BME680_THREE; count++)
temp_data_u8[count] = BME680_INIT_VALUE;
/*read uncompensated Temperature of field 0*/
if (BME680_FIELD_INDEX0 == field_index) {
/*read the 3 byte of T1 data form 0x22*/
com_status = (enum bme680_return_type)
bme680->bme680_bus_read(
bme680->dev_addr,
BME680_ADDR_FIELD_0_TEMP1,
temp_data_u8,
BME680_TEMPERATURE_DATA_LEN);
/*Assign data to the reserved index
5,6 & 7 of the input buffer*/
for (count = BME680_INIT_VALUE;
count < BME680_TEMPERATURE_DATA_LEN; count++)
a_data_u8[5 + count] = temp_data_u8[count];
/*read the 3 byte of T2 data form 0x27*/
com_status = (enum bme680_return_type)bme680->bme680_bus_read(
bme680->dev_addr,
BME680_ADDR_FIELD_0_TEMP2,
temp_data_u8,
BME680_TEMPERATURE_DATA_LEN);
/*Assign data to the reserved index
10,11 & 12 of the input buffer*/
for (count = BME680_INIT_VALUE;
count < BME680_TEMPERATURE_DATA_LEN; count++)
a_data_u8[10 + count] = temp_data_u8[count];
/*read uncompensated Temperature of field 1*/
} else if (BME680_FIELD_INDEX1 == field_index) {
/*read the 3 byte of T1 data form 0x33*/
com_status = (enum bme680_return_type)
bme680->bme680_bus_read(
bme680->dev_addr,
BME680_ADDR_FIELD_1_TEMP1,
temp_data_u8,
BME680_TEMPERATURE_DATA_LEN);
/*Assign data to the reserved index
22,23 & 24 of the input buffer*/
for (count = BME680_INIT_VALUE;
count < BME680_TEMPERATURE_DATA_LEN; count++)
a_data_u8[22 + count] = temp_data_u8[count];
/*read the 3 byte of T2 data form 0x38*/
com_status = (enum bme680_return_type)
bme680->bme680_bus_read(
bme680->dev_addr,
BME680_ADDR_FIELD_1_TEMP2,
temp_data_u8,
BME680_TEMPERATURE_DATA_LEN);
/*Assign data to the reserved index
27,28 & 29 of the input buffer*/
for (count = BME680_INIT_VALUE;
count < BME680_TEMPERATURE_DATA_LEN; count++)
a_data_u8[27 + count] = temp_data_u8[count];
/*read uncompensated Temperature of field 2*/
} else if (BME680_FIELD_INDEX2 == field_index) {
/*read the 3 byte of T1 data form 0x44*/
com_status = (enum bme680_return_type)
bme680->bme680_bus_read(
bme680->dev_addr,
BME680_ADDR_FIELD_2_TEMP1,
temp_data_u8,
BME680_TEMPERATURE_DATA_LEN);
/*Assign data to the reserved index
39,40 & 41 of the input buffer*/
for (count = BME680_INIT_VALUE;
count < BME680_TEMPERATURE_DATA_LEN; count++)
a_data_u8[39 + count] = temp_data_u8[count];
/*read the 3 byte of T2 data form 0x49*/
com_status = (enum bme680_return_type)
bme680->bme680_bus_read(
bme680->dev_addr,
BME680_ADDR_FIELD_2_TEMP2,
temp_data_u8,
BME680_TEMPERATURE_DATA_LEN);
/*Assign data to the reserved index
44,45 & 46 of the input buffer*/
for (count = BME680_INIT_VALUE;
count < BME680_TEMPERATURE_DATA_LEN; count++)
a_data_u8[44 + count] = temp_data_u8[count];
}
return com_status;
}
/*!
* @brief This function is used to read the uncompensated
* Pressure for specific Field type.
* Field-0, Field-1 and Field-2
*
* @param field_index : index of the field which needs
* to be read from the sensor
*
*
* @param a_data_u8 : pointer to store read data.
* @param bme680 structure pointer.
*
* @return results of bus communication function
* @retval 0 -> Success
* @retval any negative value -> Error
*
*
*/
enum bme680_return_type bme680_Pressure_field_specific_uncomp_read(
u8 field_index, u8 *a_data_u8, struct bme680_t *bme680)
{
enum bme680_return_type com_status = BME680_COMM_RES_ERROR;
/* local buffer length is 5 and it's the maximum */
u8 temp_data_u8[BME680_THREE];
u8 count = BME680_INIT_VALUE;
for (count = BME680_INIT_VALUE; count < BME680_THREE; count++)
temp_data_u8[count] = BME680_INIT_VALUE;
/*read uncompensated Pressure of field 0*/
if (BME680_FIELD_INDEX0 == field_index) {
/*read the 3 byte of P data form 0x1F*/
com_status = (enum bme680_return_type)
bme680->bme680_bus_read(
bme680->dev_addr,
BME680_ADDR_FIELD_0_PRESS,
temp_data_u8,
BME680_PRESSURE_DATA_LEN);
/*Assign data to the reserved index
2,3 & 4 of the input buffer*/
for (count = BME680_INIT_VALUE;
count < BME680_PRESSURE_DATA_LEN; count++)
a_data_u8[2 + count] = temp_data_u8[count];
/*read uncompensated Pressure of field 1*/
} else if (BME680_FIELD_INDEX1 == field_index) {
/*read the 3 byte of P data
form 0x30*/
com_status = (enum bme680_return_type)
bme680->bme680_bus_read(
bme680->dev_addr,
BME680_ADDR_FIELD_1_PRESS,
temp_data_u8,
BME680_PRESSURE_DATA_LEN);
/*Assign data to the
reserved index
19,20 & 21 of the input buffer*/
for (count = BME680_INIT_VALUE;
count < BME680_PRESSURE_DATA_LEN; count++)
a_data_u8[19 + count] = temp_data_u8[count];
/*read uncompensated Pressure of field 2*/
} else if (BME680_FIELD_INDEX2 == field_index) {
/*read the 3 byte of P data
form 0x41*/
com_status = (enum bme680_return_type)
bme680->bme680_bus_read(
bme680->dev_addr,
BME680_ADDR_FIELD_2_PRESS,
temp_data_u8,
BME680_PRESSURE_DATA_LEN);
/*Assign data to the reserved
index 36,37 & 38 of the input
buffer*/
for (count = BME680_INIT_VALUE;
count < BME680_PRESSURE_DATA_LEN; count++)
a_data_u8[36 + count] = temp_data_u8[count];
}
return com_status;
}
/*!
* @brief This function is used to read the uncompensated
* Humidity for specific Field type.
* Field-0, Field-1 and Field-2
*
* @param field_index : index of the field which needs
* to be read from the sensor
*
*
* @param a_data_u8 : pointer to store read data.
* @param bme680 structure pointer.
*
* @return results of bus communication function
* @retval 0 -> Success
* @retval any negative value -> Error
*
*
*/
enum bme680_return_type bme680_Humidity_field_specific_uncomp_read(
u8 field_index, u8 *a_data_u8, struct bme680_t *bme680)
{
enum bme680_return_type com_status = BME680_COMM_RES_ERROR;
/* local buffer length is 5 and it's the maximum */
u8 temp_data_u8[BME680_TWO];
u8 count = BME680_INIT_VALUE;
for (count = BME680_INIT_VALUE; count < BME680_TWO; count++)
temp_data_u8[count] = BME680_INIT_VALUE;
/*read uncompensated Humidity of field 0*/
if (BME680_FIELD_INDEX0 == field_index) {
/*read the 2 byte of H data form 0x25*/
com_status = (enum bme680_return_type)
bme680->bme680_bus_read(
bme680->dev_addr,
BME680_ADDR_FIELD_0_HUM,
temp_data_u8,
BME680_HUMIDITY_DATA_LEN);
/*Assign data to the reserved index
8 & 9 of the input buffer*/
for (count = BME680_INIT_VALUE;
count < BME680_HUMIDITY_DATA_LEN; count++)
a_data_u8[8 + count] = temp_data_u8[count];
/*read uncompensated Humidity of field 1*/
} else if (BME680_FIELD_INDEX1 == field_index) {
/*read the 2 byte of H data form 0x36*/
com_status = (enum bme680_return_type)
bme680->bme680_bus_read(
bme680->dev_addr,
BME680_ADDR_FIELD_1_HUM,
temp_data_u8,
BME680_HUMIDITY_DATA_LEN);
/*Assign data to the reserved index
25 & 26 of the input buffer*/
for (count = BME680_INIT_VALUE;
count < BME680_HUMIDITY_DATA_LEN; count++)
a_data_u8[25 + count] = temp_data_u8[count];
/*read uncompensated Humidity of field 2*/
} else if (BME680_FIELD_INDEX2 == field_index) {
/*read the 2 byte of H data form 0x47*/
com_status = (enum bme680_return_type)
bme680->bme680_bus_read(
bme680->dev_addr,
BME680_ADDR_FIELD_2_HUM,
temp_data_u8,
BME680_HUMIDITY_DATA_LEN);
/*Assign data to the reserved index
42 & 43 of the input buffer*/
for (count = BME680_INIT_VALUE;
count < BME680_HUMIDITY_DATA_LEN; count++)
a_data_u8[42 + count] = temp_data_u8[count];
}
return com_status;
}
/*!
* @brief This function is used to read the uncompensated
* Gas for specific Field type.
* Field-0, Field-1 and Field-2
*
* @param field_index : index of the field which needs
* to be read from the sensor
*
*
* @param a_data_u8 : pointer to store read data.
* @param bme680 structure pointer.
*
* @return results of bus communication function
* @retval 0 -> Success
* @retval any negative value -> Error
*
*
*/
enum bme680_return_type bme680_Gas_field_specific_uncomp_read(
u8 field_index, u8 *a_data_u8, struct bme680_t *bme680)
{
enum bme680_return_type com_status = BME680_COMM_RES_ERROR;
/* local buffer length is 5 and it's the maximum */
u8 temp_data_u8[BME680_TWO];
u8 count = BME680_INIT_VALUE;
for (count = BME680_INIT_VALUE; count < BME680_TWO; count++)
temp_data_u8[count] = BME680_INIT_VALUE;
/*read uncompensated Gas of field 0*/
if (BME680_FIELD_INDEX0 == field_index) {
/*Default field_0 required*/
/*read the 2 byte of G data form 0x2A*/
com_status = (enum bme680_return_type)bme680->bme680_bus_read(
bme680->dev_addr,
BME680_ADDR_FIELD_0_GAS,
temp_data_u8,
BME680_GAS_DATA_LEN);
/*Assign data to the reserved index
13,14 of the input buffer*/
for (count = BME680_INIT_VALUE;
count < BME680_GAS_DATA_LEN; count++)
a_data_u8[13 + count] = temp_data_u8[count];
/*read uncompensated Gas of field 1*/
} else if (BME680_FIELD_INDEX1 == field_index) {
/*read the 2 byte of G data form 0x3B*/
com_status = (enum bme680_return_type)
bme680->bme680_bus_read(
bme680->dev_addr,
BME680_ADDR_FIELD_1_GAS,
temp_data_u8,
BME680_GAS_DATA_LEN);
/*Assign data to the reserved index
30,31 of the input buffer*/
for (count = BME680_INIT_VALUE;
count < BME680_GAS_DATA_LEN; count++)
a_data_u8[30 + count] = temp_data_u8[count];
/*read uncompensated Gas of field 2*/
} else if (BME680_FIELD_INDEX2 == field_index) {
/*read the 2 byte of G data form 0x4C*/
com_status = (enum bme680_return_type)
bme680->bme680_bus_read(
bme680->dev_addr,
BME680_ADDR_FIELD_2_GAS,
temp_data_u8,
BME680_GAS_DATA_LEN);
/*Assign data to the reserved index
47,48 of the input buffer*/
for (count = BME680_INIT_VALUE;
count < BME680_GAS_DATA_LEN; count++)
a_data_u8[47 + count] = temp_data_u8[count];
}
return com_status;
}
#endif
/*!
* @brief This function is used to get the
* Operational Mode from the sensor in the
* register 0x74 bit 0 and 1
*
* @param power_mode_u8 : Pointer to store the received value
* of power mode
* value | mode
* -----------|------------------
* 0x00 | BME680_SLEEP_MODE
* 0x01 | BME680_FORCED_MODE
* 0x02 | BME680_PARALLEL_MODE
* 0x03 | BME680_SEQUENTIAL_MODE
*
* @param bme680 structure pointer.
*
* @return results of bus communication function
* @retval 0 -> Success
* @retval any negative value -> Error
*
*
*/
enum bme680_return_type bme680_get_power_mode(u8 *power_mode_u8,
struct bme680_t *bme680)
{
u8 data_u8 = BME680_INIT_VALUE;
/* used to return the communication result*/
enum bme680_return_type com_status = BME680_COMM_RES_ERROR;
/* check the bme680 is NULL pointer */
if (BME680_NULL_PTR == bme680) {
com_status = BME680_ERROR_NULL_PTR;
} else {
/* read power mode*/
com_status = (enum bme680_return_type)
bme680->bme680_bus_read(bme680->dev_addr,
BME680_ADDR_OP_MODE,
&data_u8,
BME680_GEN_READ_DATA_LENGTH);
if (BME680_COMM_RES_OK == com_status) {
*power_mode_u8 = BME680_GET_REG(data_u8,
BME680_MASK_OP_MODE,
BME680_SHIFT_OP_MODE);
/* updating power mode in global structure*/
if (bme680->last_set_mode != BME680_FORCED_MODE)
bme680->last_set_mode = *power_mode_u8;
}
}
return com_status;
}
/*!
* @brief This function is used to set the
* Operational Mode of the sensor in the
* register 0x74 bit 0 and 1
*
* @param power_mode_u8 : The value of power mode
* value | mode
* -------------|------------------
* 0x00 | BME680_SLEEP_MODE
* 0x01 | BME680_FORCED_MODE
* 0x02 | BME680_PARALLEL_MODE
* 0x03 | BME680_SEQUENTIAL_MODE
*
* @param bme680 structure pointer.
*
* @return results of bus communication function
* @retval 0 -> Success
* @retval any negative value -> Error
*
*
*/
enum bme680_return_type bme680_set_power_mode(u8 power_mode_u8,
struct bme680_t *bme680)
{
u8 data_u8 = BME680_INIT_VALUE;
/* used to return the communication result*/
enum bme680_return_type com_status = BME680_COMM_RES_ERROR;
/* check the bme680 is NULL pointer */
if (BME680_NULL_PTR == bme680) {
com_status = BME680_ERROR_NULL_PTR;
} else {
/* write power mode*/
com_status = (enum bme680_return_type)
bme680->bme680_bus_read(bme680->dev_addr,
BME680_ADDR_OP_MODE,
&data_u8,
BME680_GEN_READ_DATA_LENGTH);
if (BME680_COMM_RES_OK == com_status) {
data_u8 = BME680_SET_REG(data_u8, power_mode_u8,
BME680_MASK_OP_MODE, BME680_SHIFT_OP_MODE);
com_status = (enum bme680_return_type)
bme680->bme680_bus_write(bme680->dev_addr,
BME680_ADDR_OP_MODE,
&data_u8,
BME680_GEN_WRITE_DATA_LENGTH);
}
/* updating power mode in global structure*/
if (BME680_COMM_RES_OK == com_status)
bme680->last_set_mode = power_mode_u8;
}
return com_status;
}
/*!
* @brief This function is used to set the sensor configuration
*
* @param sens_conf : structure pointer which points to
* bme680_sens_conf structure passed by the user.
*
* @param bme680 structure pointer.
*
* @note reference input values from user are below
*
* heatr_ctrl = BME680_HEATR_CTRL_ENABLE;
* odr = BME680_ODR_20MS;
* run_gas = BME680_RUN_GAS_ENABLE;
* nb_conv = 0x01;
* osrs_hum = BME680_OSRS_1X;
* osrs_pres = BME680_OSRS_1X;
* osrs_temp = BME680_OSRS_1X;
* filter = BME680_FILTER_COEFF_1;
* spi_3w = BME680_SPI_3W_DISABLE;
* intr = BME680_SPI_3W_INTR_DISABLE
*
* @note nb_conv parameter is specific to power mode
* refer data sheet for detailed info.
*
* @return results of bus communication function
* @retval 0 -> Success
* @retval any negative value -> Error
*/
enum bme680_return_type bme680_set_sensor_config(
struct bme680_sens_conf *sens_conf, struct bme680_t *bme680)
{
/* used to return the communication result*/
enum bme680_return_type com_status = BME680_COMM_RES_ERROR;
u8 data_u8[(BME680_SENS_CONF_LEN*2)-1];
u8 index;
/* check the bme680 is NULL pointer */
if (BME680_NULL_PTR == bme680) {
com_status = BME680_ERROR_NULL_PTR;
} else {
if (BME680_SPI_INTERFACE == bme680->interface) {
/* memory page switch the SPI address*/
com_status = bme680_set_memory_page(
BME680_PAGE1_INTERFACE_SPI, bme680);
}
if (BME680_I2C_INTERFACE == bme680->interface)
com_status = BME680_COMM_RES_OK;
if (BME680_COMM_RES_OK == com_status) {
for (index = 0; index < (BME680_SENS_CONF_LEN * 2) - 2;
index++)
data_u8[index] = BME680_INIT_VALUE;
com_status = (enum bme680_return_type)bme680->bme680_bus_read(
bme680->dev_addr,
BME680_ADDR_SENSOR_CONFIG,
data_u8,
(BME680_SENS_CONF_LEN));
if (BME680_COMM_RES_OK == com_status) {
data_u8[BME680_INDEX_CTRL_GAS_0] =
(sens_conf->heatr_ctrl & 0x01)
<< BME680_SHIFT_HEATR_CTRL;
data_u8[BME680_INDEX_CTRL_GAS_1] =
((sens_conf->odr & 0x08) << BME680_SHIFT_ODR_3)
| ((sens_conf->run_gas & 0x01) <<
BME680_SHIFT_RUN_GAS) |
(sens_conf->nb_conv & 0x0F);
data_u8[BME680_INDEX_CTRL_HUM] =
((sens_conf->intr & 0x01) <<
BME680_SHIFT_SPI_3W_INT) |
(sens_conf->osrs_hum & 0x07);
data_u8[BME680_INDEX_CTRL_MEAS] =
((sens_conf->osrs_pres & 0x07) <<
BME680_SHIFT_OSRS_PRES) |
((sens_conf->osrs_temp & 0x07) <<
BME680_SHIFT_OSRS_TEMP) |
(data_u8[BME680_INDEX_CTRL_MEAS] & 0x03);
data_u8[BME680_INDEX_CONFIG] =
(((sens_conf->odr) & 0x07) <<
BME680_SHIFT_ODR_2_0) |
((sens_conf->filter & 0x07) <<
BME680_SHIFT_FILTER) |
(sens_conf->spi_3w & 0x01);
#ifndef __KERNEL__
bme680_buffer_restruct_burst_write(data_u8,
0x70,
BME680_SENS_CONF_LEN,
(BME680_SENS_CONF_LEN * 2)-1);
com_status = (enum bme680_return_type)
bme680->bme680_bus_write(bme680->dev_addr,
BME680_ADDR_SENSOR_CONFIG,
data_u8,
(BME680_SENS_CONF_LEN * 2)-1);
#else
com_status = (enum bme680_return_type)
bme680->bme680_bus_write(bme680->dev_addr,
BME680_ADDR_SENSOR_CONFIG,
data_u8,
BME680_SENS_CONF_LEN);
#endif
}
}
}
return com_status;
}
/*!
* @brief This function is used to get the sensor configuration
*
* @param sens_conf : structure pointer which points to
* bme680_sens_conf structure passed by the user to store the
* received configuration
*
* @param bme680 structure pointer.
*
* @note reference output values from the sensor are below
*
* heatr_ctrl = BME680_HEATR_CTRL_ENABLE;
* odr = BME680_ODR_20MS;
* run_gas = BME680_RUN_GAS_ENABLE;
* nb_conv = 0x01;
* osrs_hum = BME680_OSRS_1X;
* osrs_pres = BME680_OSRS_1X;
* osrs_temp = BME680_OSRS_1X;
* filter = BME680_FILTER_COEFF_1;
* spi_3w = BME680_SPI_3W_DISABLE;
* intr = BME680_SPI_3W_INTR_DISABLE
*
* @note actual settings may differ as configured by user earlier using
* bme680_set_sensor_config function.
* @note nb_conv parameter is specific to power mode
* refer data sheet for detailed info.
*
* @return results of bus communication function
* @retval 0 -> Success
* @retval any negative value -> Error
*/
enum bme680_return_type bme680_get_sensor_config(
struct bme680_sens_conf *sens_conf, struct bme680_t *bme680)
{
/* used to return the communication result*/
enum bme680_return_type com_status = BME680_COMM_RES_ERROR;
u8 data_u8[BME680_SENS_CONF_LEN];
u8 index;
/* check the bme680 is NULL pointer */
if (BME680_NULL_PTR == bme680) {
com_status = BME680_ERROR_NULL_PTR;
} else {
if (BME680_SPI_INTERFACE == bme680->interface) {
/* memory page switch the SPI address*/
com_status = bme680_set_memory_page(
BME680_PAGE1_INTERFACE_SPI, bme680);
}
else if (BME680_I2C_INTERFACE == bme680->interface)
com_status = BME680_COMM_RES_OK;
if (BME680_COMM_RES_OK == com_status) {
for (index = 0; index < BME680_SENS_CONF_LEN ; index++)
data_u8[index] = BME680_INIT_VALUE;
com_status = (enum bme680_return_type)
bme680->bme680_bus_read(
bme680->dev_addr,
BME680_ADDR_SENSOR_CONFIG,
data_u8,
BME680_SENS_CONF_LEN);
if (BME680_COMM_RES_OK == com_status) {
sens_conf->heatr_ctrl = (enum bme680_heatr_ctrl)
BME680_GET_REG(data_u8[BME680_INDEX_CTRL_GAS_0],
BME680_MASK_HEATR_CTRL,
BME680_SHIFT_HEATR_CTRL);
sens_conf->run_gas = (enum bme680_run_gas)
BME680_GET_REG(data_u8[BME680_INDEX_CTRL_GAS_1],
BME680_MASK_RUN_GAS,
BME680_SHIFT_RUN_GAS);
sens_conf->nb_conv = BME680_GET_REG(
data_u8[BME680_INDEX_CTRL_GAS_1],
BME680_MASK_PROF_INDEX,
BME680_SHIFT_PROF_INDEX);
sens_conf->odr = (enum bme680_odr)((BME680_GET_REG(
data_u8[BME680_INDEX_CTRL_GAS_1],
BME680_MASK_ODR_3,
BME680_SHIFT_ODR_3)) | (BME680_GET_REG(
data_u8[BME680_INDEX_CONFIG],
BME680_MASK_ODR_2_0,
BME680_SHIFT_ODR_2_0)));
sens_conf->osrs_hum = (enum bme680_osrs_x)
BME680_GET_REG(data_u8[BME680_INDEX_CTRL_HUM],
BME680_MASK_OSRS_HUM,
BME680_SHIFT_OSRS_HUM);
sens_conf->intr = (enum bme680_spi_3w_intr)
BME680_GET_REG(data_u8[BME680_INDEX_CTRL_HUM],
BME680_MASK_SPI_3W_INT,
BME680_SHIFT_SPI_3W_INT);
sens_conf->osrs_pres = (enum bme680_osrs_x)
BME680_GET_REG(data_u8[BME680_INDEX_CTRL_MEAS],
BME680_MASK_OSRS_PRES,
BME680_SHIFT_OSRS_PRES);
sens_conf->osrs_temp = (enum bme680_osrs_x)
BME680_GET_REG(data_u8[BME680_INDEX_CTRL_MEAS],
BME680_MASK_OSRS_TEMP,
BME680_SHIFT_OSRS_TEMP);
sens_conf->filter = (enum bme680_filter)BME680_GET_REG(
data_u8[BME680_INDEX_CONFIG],
BME680_MASK_FILTER,
BME680_SHIFT_FILTER);
sens_conf->spi_3w = (enum bme680_spi_3w)BME680_GET_REG(
data_u8[BME680_INDEX_CONFIG],
BME680_MASK_SPI_3W_EN,
BME680_SHIFT_SPI_3W_EN);
}
}
}
return com_status;
}
/*!
* @brief This function is used for setting gas heater configuration
* of the sensor from register 50 to 6E address
*
* @param heatr_conf : structure pointer of Heater configuration
* structure
*
* @param bme680 structure pointer.
*
* @note reference input values from user are below
*
* heatr_idacv - initial heater current for
* target heater temperature(optional)
* heater_temp - target temperature (200 to 400 deg cls)
* heatr_dur - heater duration ( 1 to 4032 ms)
* heatr_dur_shared - wait time for parallel mode
* profile_cnt - user configurable profiles(1 to 10)
*
* @note heatr_dur and heatr_duration share behaviour varies
* between parallel and other modes.
* kindly refer data-sheet
*
* @return results of bus communication function
* @retval 0 -> Success
* @retval any negative value -> Error
*
*/
enum bme680_return_type bme680_set_gas_heater_config(
struct bme680_heater_conf *heatr_conf, struct bme680_t *bme680)
{
/* used to return the communication result*/
enum bme680_return_type com_status = BME680_COMM_RES_ERROR;
u8 data_u8[(BME680_SENS_HEATR_CONF_LEN << 1)-1] = {0};
u8 index;
u8 power_mode = 0;
/* check the bme680 is NULL pointer */
if (BME680_NULL_PTR == bme680) {
com_status = BME680_ERROR_NULL_PTR;
} else {
if (BME680_SPI_INTERFACE == bme680->interface) {
/* memory page switch the SPI address*/
com_status = bme680_set_memory_page(
BME680_PAGE1_INTERFACE_SPI, bme680);
} else if (BME680_I2C_INTERFACE == bme680->interface)
com_status = BME680_COMM_RES_OK;
if (BME680_COMM_RES_OK == com_status) {
/* get power mode to identify parallel or other modes */
com_status = bme680_get_power_mode(&power_mode, bme680);
for (index = 0; index < heatr_conf->profile_cnt;
index++) {
data_u8[index] = heatr_conf->heatr_idacv[index];
#ifdef FIXED_POINT_COMPENSATION
data_u8[index + 10] =
bme680_convert_temperature_to_resistance_int32(
heatr_conf->heater_temp[index],
25, bme680);
#else
data_u8[index + 10] =
bme680_convert_temperature_to_resistance_double(
heatr_conf->heater_temp[index],
25, bme680);
#endif
if (power_mode != BME680_PARALLEL_MODE)
bme680_scale_to_multiplication_factor(
&heatr_conf->heatr_dur[index]);
data_u8[index + 20] = heatr_conf->heatr_dur[index];
}
if (BME680_PARALLEL_MODE == power_mode) {
heatr_conf->heatr_dur_shared =
(heatr_conf->heatr_dur_shared * 1000) /
BME680_GAS_WAIT_STEP_SIZE;
bme680_scale_to_multiplication_factor(
&heatr_conf->heatr_dur_shared);
data_u8[30] = heatr_conf->heatr_dur_shared;
}
#ifndef __KERNEL__
bme680_buffer_restruct_burst_write(data_u8,
BME680_ADDR_SENS_CONF_START,
BME680_SENS_HEATR_CONF_LEN,
(BME680_SENS_HEATR_CONF_LEN << 1)-1);
com_status = (enum bme680_return_type)bme680->bme680_bus_write(
bme680->dev_addr,
BME680_ADDR_SENS_CONF_START,
data_u8,
(BME680_SENS_HEATR_CONF_LEN << 1)-1);
#else
com_status = (enum bme680_return_type)bme680->bme680_bus_write(
bme680->dev_addr,
BME680_ADDR_SENS_CONF_START,
data_u8,
BME680_SENS_HEATR_CONF_LEN);
#endif
}
}
return com_status;
}
/*!
* @brief This function is used to convert the gas duration
* according to multiplication factor of the sensor
*
* @note
* gas_wait_X(5:0) define 64 timer values
* gas_wait_X(7:6) define a multiplication factor
*
* gas_wait_X (7:6) | multiplication factor
* ------------------|------------------------------
* 00 | 1
* 01 | 4
* 10 | 16
* 11 | 64
*
* @param duration_u16 : pointer to store the
* the converted gas duration
*
* @return none
*/
static void bme680_scale_to_multiplication_factor(u16 *duration_u16)
{
u8 factor = 0;
while ((*duration_u16) > BME680_GAS_WAIT_MAX_TIMER_VALUE) {
(*duration_u16) = (*duration_u16) >> 2;
factor += 1;
}
(*duration_u16) = (*duration_u16) + (factor * 64);
}
/*!
* @brief This function is used to rearrange the buffer
* according to burst write configuration of BME680 sensor
*
* @param arr : interface buffer for SPI or I2C
* @param reg_addr : register address to write
* @param data_size : no of bytes of data to write
* @param arr_size : size of the array
*
* @return none
*
*/
#ifndef __KERNEL__
static void bme680_buffer_restruct_burst_write(u8 arr[], u8 reg_addr,
u8 data_size, u8 arr_size)
{
s8 index, sub_index = 0;
for (index = 0 ; index < (data_size - 1); index++) {
arr[arr_size - 1 - sub_index] = arr[data_size - index - 1];
arr[arr_size - 2 - sub_index] = reg_addr + data_size - 1;
--reg_addr;
sub_index += 2;
}
}
#endif
/*!
* @brief This function is used to read the sensor heater
* configuration from register 50 to 6E address
*
* @param heatr_conf : structure pointer of Heater
* configuration structure
*
* @param bme680 structure pointer.
*
* @note reference output values from the sensor are below
*
* heatr_idacv - initial heater current for
* target heater temperature(optional)
* heater_temp - target temperature (200 to 400 deg cls)
* heatr_dur - heater duration ( 1 to 4032 ms)
* heatr_dur_shared - wait time for parallel mode
*
* @note heatr_dur and heatr_duration share behaviour varies
* between parallel and other modes.
* kindly refer data-sheet
*
* @return results of bus communication function
* @retval 0 -> Success
* @retval any negative value -> Error
*
* @note if error code is -5 = BME680_PROFILE_CNT_ERROR
* means profile count is not set by user.
* it must be set before calling this function.
*
*/
enum bme680_return_type bme680_get_gas_heater_config(
struct bme680_heater_conf *heatr_conf, struct bme680_t *bme680)
{
/* used to return the communication result*/
enum bme680_return_type com_status = BME680_COMM_RES_ERROR;
u8 data_u8[BME680_SENS_HEATR_CONF_LEN];
u8 index;
/* check the bme680 is NULL pointer */
if (BME680_NULL_PTR == bme680) {
com_status = BME680_ERROR_NULL_PTR;
} else {
if (BME680_SPI_INTERFACE == bme680->interface) {
/* memory page switch the SPI address*/
com_status = bme680_set_memory_page(
BME680_PAGE1_INTERFACE_SPI, bme680);
} else if (BME680_I2C_INTERFACE == bme680->interface)
com_status = BME680_COMM_RES_OK;
if (BME680_COMM_RES_OK == com_status) {
for (index = 0; index < BME680_SENS_HEATR_CONF_LEN; index++)
data_u8[index] = BME680_INIT_VALUE;
com_status = (enum bme680_return_type)
bme680->bme680_bus_read(bme680->dev_addr,
0x50,
data_u8,
BME680_SENS_HEATR_CONF_LEN);
if (BME680_COMM_RES_OK == com_status) {
/* 0<= pc <=10 has been modified in order to
* avoid warning, "pointless comparison of
* unsigned int with zero"
*/
if ((heatr_conf->profile_cnt > 0 &&
heatr_conf->profile_cnt <= BME680_PROFILE_MAX) ||
(heatr_conf->profile_cnt == 0)) {
for (index = 0; index < BME680_PROFILE_MAX;
index++) {
heatr_conf->heatr_idacv[index] =
data_u8[index];
heatr_conf->heater_temp[index] =
data_u8[index + 10];
heatr_conf->heatr_dur[index] =
data_u8[index + 20];
}
} else {
com_status = BME680_PROFILE_CNT_ERROR;
}
heatr_conf->heatr_dur_shared = data_u8[30];
}
}
}
return com_status;
}
/*!
* @brief This function is used to compensate the TPHG raw
* values of the sensor in order to convert to meaningful values
*
* @param uncomp_data : Pointer to array of structure which
* contains the uncompensated TPHG data
* @param comp_data : Pointer to array of structure which
* stores the compensated TPHG data
* @param field_count : total no of field data which needs to be
* compensated.
*
*field_count | Expected values
* -------------|-----------------------
* 1 | ONLY_ONE FIELD
* 2 | ONLY_TWO_FIELD
* 3 | THREE_FIELD
*
* @param sensor_type : Type of sensor
*
* sensor_type | Expected values
* ---------------------|-------------------
* BME680_ALL | TPGH data
* BME680_PRESSURE | Pressure data
* BME680_TEMPERATURE| Temp data
* BME680_HUMIDITY | Humidity data
* BME680_GAS | Gas data
*
* @note: if "BME680_SPECIFIC_FIELD_DATA_READ_ENABLED" is not defined in
* bme680.h then for any sensor_type function will perform
* read operation for BME680_ALL.
* @note : pressure and humidity depends on temperature.
*
* @param bme680 : structure pointer.
*
* @note Undefined behaviour for values other than mentioned above
*
* @return results of bus communication function
* @retval 0 -> Success
* @retval any negative value -> Error
*
* @note error code is returned when data readout is attempted
* in sleep mode or when field_count is not in the below range
* it must be 1<= field_count <= 3
*
*/
enum bme680_return_type bme680_compensate_data(
struct bme680_uncomp_field_data *uncomp_data,
struct bme680_comp_field_data *comp_data,
u8 field_count, u8 sensor_type, struct bme680_t *bme680)
{
/* used to return the communication result*/
enum bme680_return_type com_status = BME680_COMM_RES_ERROR;
u8 index;
u8 max_count = 3;
if ((field_count < 1 || field_count > 3)
|| (BME680_SLEEP_MODE == bme680->last_set_mode)) {
com_status = BME680_COMM_RES_ERROR;
} else {
if (BME680_FORCED_MODE == bme680->last_set_mode)
field_count = BME680_PRESENT_DATA_FIELD;
#ifndef BME680_SPECIFIC_FIELD_DATA_READ_ENABLED
sensor_type = BME680_ALL;
field_count = BME680_ALL_DATA_FIELD;
#endif
for (index = 0; ((index < field_count) &&
(index < max_count)); index++) {
#ifdef FIXED_POINT_COMPENSATION
switch (sensor_type) {
case BME680_TEMPERATURE:
(comp_data + index)->comp_temperature1 =
bme680_compensate_temperature_int32(
(uncomp_data+index)->temp_adcv,
bme680);
break;
case BME680_PRESSURE:
(comp_data + index)->comp_temperature1 =
bme680_compensate_temperature_int32(
(uncomp_data+index)->temp_adcv,
bme680);
(comp_data + index)->comp_pressure =
bme680_compensate_pressure_int32(
(uncomp_data+index)->pres_adcv,
bme680);
break;
case BME680_HUMIDITY:
(comp_data + index)->comp_temperature1 =
bme680_compensate_temperature_int32(
(uncomp_data+index)->temp_adcv,
bme680);
(comp_data + index)->comp_humidity =
bme680_compensate_humidity_int32(
(uncomp_data+index)->hum_adcv,
bme680);
break;
case BME680_GAS:
(comp_data + index)->comp_gas = bme680_calculate_gas_int32(
(uncomp_data+index)->gas_res_adcv,
(uncomp_data + index)->gas_range, bme680);
break;
case BME680_ALL:
(comp_data + index)->comp_temperature1 =
bme680_compensate_temperature_int32(
(uncomp_data+index)->temp_adcv,
bme680);
(comp_data + index)->comp_pressure =
bme680_compensate_pressure_int32(
(uncomp_data+index)->pres_adcv,
bme680);
(comp_data + index)->comp_humidity =
bme680_compensate_humidity_int32(
(uncomp_data+index)->hum_adcv,
bme680);
(comp_data + index)->comp_gas = bme680_calculate_gas_int32(
(uncomp_data+index)->gas_res_adcv,
(uncomp_data + index)->gas_range,
bme680);
break;
}
#else
switch (sensor_type) {
case BME680_TEMPERATURE:
(comp_data + index)->comp_temperature1 =
bme680_compensate_temperature_double(
(uncomp_data+index)->temp_adcv,
bme680);
break;
case BME680_PRESSURE:
(comp_data + index)->comp_temperature1 =
bme680_compensate_temperature_double(
(uncomp_data+index)->temp_adcv,
bme680);
(comp_data + index)->comp_pressure =
bme680_compensate_pressure_double(
(uncomp_data+index)->pres_adcv,
bme680);
break;
case BME680_HUMIDITY:
(comp_data + index)->comp_temperature1 =
bme680_compensate_temperature_double(
(uncomp_data+index)->temp_adcv,
bme680);
(comp_data + index)->comp_humidity =
bme680_compensate_humidity_double(
(uncomp_data+index)->hum_adcv,
(comp_data + index)->comp_temperature1,
bme680);
break;
case BME680_GAS:
(comp_data + index)->comp_gas =
bme680_compensate_gas_double(
(uncomp_data+index)->gas_res_adcv,
(uncomp_data + index)->gas_range,
bme680);
break;
case BME680_ALL:
(comp_data + index)->comp_temperature1 =
bme680_compensate_temperature_double(
(uncomp_data+index)->temp_adcv,
bme680);
(comp_data + index)->comp_pressure =
bme680_compensate_pressure_double(
(uncomp_data+index)->pres_adcv,
bme680);
(comp_data + index)->comp_humidity =
bme680_compensate_humidity_double(
(uncomp_data+index)->hum_adcv,
(comp_data + index)->comp_temperature1,
bme680);
(comp_data + index)->comp_gas = bme680_compensate_gas_double(
(uncomp_data+index)->gas_res_adcv,
(uncomp_data + index)->gas_range,
bme680);
break;
}
#endif
}
com_status = BME680_COMM_RES_OK;
}
return com_status;
}
/*!
* @brief This function is used to write memory page
* from the register 0x73 bit 4
*
*
* @param memory_page_u8:
* The value of memory page
* value | Description
* --------|--------------
* 0 | BME680_PAGE0_INTERFACE_SPI
* 1 | BME680_PAGE1_INTERFACE_SPI
*
*
* @param bme680 structure pointer.
*
* @return results of bus communication function
* @retval 0 -> Success
* @retval any negative value -> Error
*
*
*/
static enum bme680_return_type bme680_set_memory_page(u8 memory_page_u8,
struct bme680_t *bme680)
{
u8 data_u8 = BME680_INIT_VALUE;
/* used to return the communication result*/
enum bme680_return_type com_status = BME680_COMM_RES_ERROR;
/* check the bme680 is NULL pointer */
if (BME680_NULL_PTR == bme680) {
com_status = BME680_ERROR_NULL_PTR;
} else {
/* write memory page*/
com_status = (enum bme680_return_type)bme680->bme680_bus_read(
bme680->dev_addr,
BME680_ADDR_SPI_MEM_PAGE,
&data_u8,
BME680_GEN_READ_DATA_LENGTH);
data_u8 = BME680_SET_REG(data_u8, memory_page_u8,
BME680_MASK_MEM_PAGE,
BME680_SHIFT_SPI_MEM_PAGE);
if (BME680_COMM_RES_OK == com_status)
com_status = (enum bme680_return_type)
bme680->bme680_bus_write(
bme680->dev_addr,
BME680_ADDR_SPI_MEM_PAGE,
&data_u8,
BME680_GEN_WRITE_DATA_LENGTH);
}
return com_status;
}
/*!
* @brief This function is used to Align uncompensated data
* from function bme680_get_uncomp_data()
*
* @param a_data_u8 : pointer to buffer
* @param field_count : total no of field data which needs
* to be compensated
* @param sensor_type : Type of sensor
*
* sensor_type | Expected values
* ---------------------|-------------------
* BME680_ALL | TPGH data
* BME680_PRESSURE | Pressure data
* BME680_TEMPERATURE| Temp data
* BME680_HUMIDITY | Humidity data
* BME680_GAS | Gas data
*
* @note : pressure and humidity depends on temperature.
*
* @param uncomp_data : Pointer to array of structure which
* contains the uncompensated TPHG data
* @param bme680 structure pointer.
* @return - None
*
*
*/
void bme680_align_uncomp_data(u8 *a_data_u8, u8 field_count, u8 sensor_type,
struct bme680_uncomp_field_data *uncomp_data, struct bme680_t *bme680)
{
u8 offset = BME680_INIT_VALUE;
s8 index = BME680_INIT_VALUE;
if (BME680_FORCED_MODE != bme680->last_set_mode)
field_count = BME680_ALL_DATA_FIELD;
for (index = 0; index < field_count; index++) {
offset = (index * BME680_FIELD_SIZE);
/* field_index status */
(uncomp_data + index)->status.new_data = BME680_GET_REG(
a_data_u8[FIELD_0_MEAS_STATUS_0 + offset],
BME680_MASK_NEW_DATA,
BME680_SHIFT_NEW_DATA);
(uncomp_data + index)->status.gas_meas_stat = BME680_GET_REG(
a_data_u8[FIELD_0_MEAS_STATUS_0 + offset],
BME680_MASK_GAS_MEAS_STAT,
BME680_SHIFT_GAS_MEAS_STAT);
(uncomp_data + index)->status.tphg_meas_stat = BME680_GET_REG(
a_data_u8[FIELD_0_MEAS_STATUS_0 + offset],
BME680_MASK_TPHG_MEAS_STAT,
BME680_SHIFT_TPHG_MEAS_STAT);
(uncomp_data + index)->status.gas_meas_index = BME680_GET_REG(
a_data_u8[FIELD_0_MEAS_STATUS_0 + offset],
BME680_MASK_GAS_MEAS_INDEX,
BME680_SHIFT_GAS_MEAS_INDEX);
(uncomp_data + index)->status.meas_index =
a_data_u8[FIELD_0_MEAS_STATUS_1 + offset];
(uncomp_data + index)->gas_range = BME680_GET_REG(
a_data_u8[FIELD_0_GAS_RL_LSB + offset],
BME680_MASK_GAS_RANGE,
BME680_SHIFT_GAS_RANGE);
(uncomp_data + index)->status.gas_valid = BME680_GET_REG(
a_data_u8[FIELD_0_GAS_RL_LSB + offset],
BME680_MASK_GAS_VALID,
BME680_SHIFT_GAS_VALID);
(uncomp_data + index)->status.heatr_stab = BME680_GET_REG(
a_data_u8[FIELD_0_GAS_RL_LSB + offset],
BME680_MASK_HEATR_STAB,
BME680_SHIFT_HEATR_STAB);
/* uncompensated field zero
pressure data*/
bme680_align_sensor_type_uncomp_data(a_data_u8, index, offset,
sensor_type,
uncomp_data);
}
}
/*!
* @brief This function is used to get the index of latest, recent and old
* field data according to the sub_meas_index parameter.
*
* @param sensor_data : structure pointer of uncompensated array
* of 3 structure
*
* @param bme680 structure pointer.
*
* @return results of bus communication function
* @retval 0 -> Success
* @retval Any Negative -> Error
*
*
*/
void bme680_get_latest_recent_old_field_index(
struct bme680_uncomp_field_data *sensor_data,
struct bme680_t *bme680)
{
/* Array holding the filed0, field1 and field2
temperature, pressure, humidity and gas data*/
u8 latest = BME680_INIT_VALUE;
u8 recent = BME680_INIT_VALUE;
u8 old = BME680_INIT_VALUE;
u8 index = BME680_INIT_VALUE;
u8 large_index = BME680_INIT_VALUE;
u8 max_index = 2;
u8 meas_index[3];
for (index = BME680_INIT_VALUE; index < 3; index++)
meas_index[index] = BME680_INIT_VALUE;
index = 0;
for (index = 0; index < 3; index++)
meas_index[index] = (sensor_data + index)->status.meas_index;
index = 0;
latest = DIFF(meas_index[0], meas_index[1]);
if ((DIFF(meas_index[0], meas_index[1]) > 2) ||
(DIFF(meas_index[1], meas_index[2]) > 2)) {
while (meas_index[index++] != 255)
;
old = --index;
if (index == 2) {
recent = index - 2;
latest = index - 1;
} else if (index == 1) {
recent = index + 1;
latest = index - 1;
} else {
recent = index + 1;
latest = index + 2;
}
} else {
large_index = bme680_find_largest_index(meas_index);
latest = large_index;
if (large_index == max_index) {
recent = max_index - 1;
old = max_index - 2;
} else if (large_index == (max_index - 1)) {
recent = max_index - 2;
old = max_index;
} else {
recent = max_index;
old = max_index - 1;
}
}
bme680->latest_field_index = latest;
bme680->recent_field_index = recent;
bme680->old_field_index = old;
}
/*!
* @brief This function is used to read the status of all 3 fields
*
* @param uncomp_data : Pointer to array of uncompensated data structure.
* @param a_data_u8: pointer to store the read status data.
* @param new_data: pointer to store the new_data value of given field
* @param bme680 structure pointer.
*
* @return results of bus communication function
* @retval 0 -> Success
* @retval Any Negative -> Error
*
*
*/
enum bme680_return_type bme680_read_status_fields(
struct bme680_uncomp_field_data *uncomp_data,
u8 *a_data_u8, u8 *new_data,
struct bme680_t *bme680)
{
/* used to return the communication result*/
enum bme680_return_type com_status = BME680_COMM_RES_ERROR;
u8 count = BME680_INIT_VALUE;
/* local buffer length is 5 and it's the maximum */
u8 temp_data_u8[2] = {BME680_INIT_VALUE, BME680_INIT_VALUE};
/*read the 2 byte of status form 0x1D - field_0*/
com_status = (enum bme680_return_type)
bme680->bme680_bus_read(bme680->dev_addr,
BME680_ADDR_FIELD_0_STATUS,
temp_data_u8,
BME680_STATUS_DATA_LEN);
/* Assign data to the reserved
index of the input buffer */
for (count = BME680_INIT_VALUE;
count < BME680_STATUS_DATA_LEN; count++)
a_data_u8[0 + count] = temp_data_u8[count];
(uncomp_data + 0)->status.meas_index = a_data_u8[1];
if (BME680_COMM_RES_OK == com_status)
new_data[0] = BME680_GET_REG(a_data_u8[0],
BME680_MASK_NEW_DATA,
BME680_SHIFT_NEW_DATA);
/*read the 2 byte of status form 0x2E - field_1*/
com_status = (enum bme680_return_type)
bme680->bme680_bus_read(bme680->dev_addr,
BME680_ADDR_FIELD_1_STATUS,
temp_data_u8,
BME680_STATUS_DATA_LEN);
/*Assign data to the reserved index
17 and 18 of the input buffer*/
for (count = BME680_INIT_VALUE;
count < BME680_STATUS_DATA_LEN; count++)
a_data_u8[17 + count] = temp_data_u8[count];
(uncomp_data + 1)->status.meas_index = a_data_u8[18];
if (BME680_COMM_RES_OK == com_status)
new_data[1] = BME680_GET_REG(a_data_u8[17],
BME680_MASK_NEW_DATA,
BME680_SHIFT_NEW_DATA);
/*read the 2 byte of status form 0x3F - field_2*/
com_status = (enum bme680_return_type)
bme680->bme680_bus_read(bme680->dev_addr,
BME680_ADDR_FIELD_2_STATUS,
temp_data_u8,
BME680_STATUS_DATA_LEN);
/*Assign data to the reserved index
34 and 35 of the input buffer*/
for (count = BME680_INIT_VALUE;
count < BME680_STATUS_DATA_LEN; count++)
a_data_u8[34 + count] = temp_data_u8[count];
(uncomp_data + 2)->status.meas_index = a_data_u8[35];
if (BME680_COMM_RES_OK == com_status)
new_data[2] = BME680_GET_REG(a_data_u8[34],
BME680_MASK_NEW_DATA,
BME680_SHIFT_NEW_DATA);
return com_status;
}
/*!
* @brief This function is used to copy the ordered
* uncompensated data
*
* @param sensor_data : structure pointer of uncompensated array
* of 3 structure
* @param latest : total no of field
* @param recent : total no of field
* @param old : total no of field
*
* @param sensor_type : type of the sensor
* @param temp_sensor_data: structure pointer.
*
* @return results of bus communication function
* @retval 0 -> Success
* @retval Any Negative -> Error
*
*
*/
void bme680_copy_ordered_sensor_field_data(
struct bme680_uncomp_field_data *sensor_data,
u8 latest, u8 recent, u8 old, u8 sensor_type,
struct bme680_uncomp_field_data *temp_sensor_data)
{
u8 index = BME680_INIT_VALUE;
#ifndef BME680_SPECIFIC_FIELD_DATA_READ_ENABLED
sensor_type = BME680_ALL;
#endif
#ifdef BME680_SPECIFIC_FIELD_DATA_READ_ENABLED
/* copy status of all field */
for (index = BME680_INIT_VALUE; index < BME680_MAX_FIELD_INDEX;
index++) {
if (index == BME680_FIELD_INDEX0)
sensor_data[index].status =
temp_sensor_data[latest].status;
else if (index == BME680_FIELD_INDEX1)
sensor_data[index].status =
temp_sensor_data[recent].status;
else
sensor_data[index].status =
temp_sensor_data[old].status;
}
if (BME680_PRESSURE == sensor_type || BME680_TEMPERATURE == sensor_type
|| BME680_HUMIDITY == sensor_type) {
/* copy temperature data
by default for Pressure and Humidity
*/
for (index = BME680_INIT_VALUE; index < BME680_MAX_FIELD_INDEX;
index++) {
if (index == BME680_FIELD_INDEX0)
sensor_data[index].temp_adcv =
temp_sensor_data[latest].temp_adcv;
else if (index == BME680_FIELD_INDEX1)
sensor_data[index].temp_adcv =
temp_sensor_data[recent].temp_adcv;
else {
sensor_data[index].temp_adcv =
temp_sensor_data[old].temp_adcv;
}
}
switch (sensor_type) {
case BME680_PRESSURE:
/* copying only pressure data */
for (index = BME680_INIT_VALUE; index < BME680_MAX_FIELD_INDEX;
index++) {
if (index == BME680_FIELD_INDEX0)
sensor_data[index].pres_adcv =
temp_sensor_data[latest].pres_adcv;
else if (index == BME680_FIELD_INDEX1)
sensor_data[index].pres_adcv =
temp_sensor_data[recent].pres_adcv;
else {
sensor_data[index].pres_adcv =
temp_sensor_data[old].pres_adcv;
}
}
break;
case BME680_HUMIDITY:
/* copying only humidity data */
for (index = BME680_INIT_VALUE; index < BME680_MAX_FIELD_INDEX;
index++) {
if (index == BME680_FIELD_INDEX0)
sensor_data[index].hum_adcv =
temp_sensor_data[latest].hum_adcv;
else if (index == BME680_FIELD_INDEX1)
sensor_data[index].hum_adcv =
temp_sensor_data[recent].hum_adcv;
else {
sensor_data[index].hum_adcv =
temp_sensor_data[old].hum_adcv;
}
}
break;
}
} else if (BME680_GAS == sensor_type) {
/* copying only gas data */
for (index = BME680_INIT_VALUE; index < BME680_MAX_FIELD_INDEX;
index++) {
if (index == BME680_FIELD_INDEX0)
sensor_data[index].gas_res_adcv =
temp_sensor_data[latest].gas_res_adcv;
else if (index == BME680_FIELD_INDEX1)
sensor_data[index].gas_res_adcv =
temp_sensor_data[recent].gas_res_adcv;
else {
sensor_data[index].gas_res_adcv =
temp_sensor_data[old].gas_res_adcv;
}
}
} else if (BME680_ALL == sensor_type) {
/* copying T,P,G,& H data */
for (index = BME680_INIT_VALUE; index < BME680_MAX_FIELD_INDEX;
index++) {
if (index == BME680_FIELD_INDEX0)
*(sensor_data + index) =
*(temp_sensor_data + latest);
else if (index == BME680_FIELD_INDEX1)
*(sensor_data + index) =
*(temp_sensor_data + recent);
else
*(sensor_data + index) =
*(temp_sensor_data + old);
}
}
#else
if (BME680_ALL == sensor_type) {
/* copying T,P,G,& H data */
for (index = BME680_INIT_VALUE; index < BME680_MAX_FIELD_INDEX;
index++) {
if (index == BME680_FIELD_INDEX0)
*(sensor_data + index) =
*(temp_sensor_data + latest);
else if (index == BME680_FIELD_INDEX1)
*(sensor_data + index) =
*(temp_sensor_data + recent);
else
*(sensor_data + index) =
*(temp_sensor_data + old);
}
}
#endif
}
/*!
* @brief This utility function is to return the largest number
* index of the input array passed to the function.
*
* @param meas_index: pointer to the integer array
*
* @return index of largest element of the array
*
*
*/
static u8 bme680_find_largest_index(u8 *meas_index)
{
u8 index = BME680_INIT_VALUE;
u8 temp_index = BME680_INIT_VALUE;
if (*(meas_index + index) > *(meas_index + (index + 2))) {
if (*(meas_index + index) > *(meas_index + (index + 1)))
temp_index = index;
else
temp_index = index + 1;
} else {
temp_index = index + 2;
}
return temp_index;
}
/*!
* @brief This function is used to uncompensated data
* for the specified sensor type and called from the
* function bme680_align_uncomp_data()
*
* @param a_data_u8 : pointer to buffer
* @param index : index value
* @param offset : offset value
* @param uncomp_data : Pointer to array of structure which
* contains the uncompensated TPHG data
* @param sensor_type : type of sensor which needs
* to be compensated.
*
* sensor_type | Expected values
* ---------------------|-------------------
* BME680_ALL | TPGH data
* BME680_PRESSURE | Pressure data
* BME680_TEMPERATURE| Temp data
* BME680_HUMIDITY | Humidity data
* BME680_GAS | Gas data
*
* @note : pressure and humidity depends on temperature.
*
* @param bme680 structure pointer.
*
* @return - None
*
*
*/
static void bme680_align_sensor_type_uncomp_data(u8 *a_data_u8, u8 index,
u8 offset, u8 sensor_type,
struct bme680_uncomp_field_data *uncomp_data)
{
switch (sensor_type) {
case BME680_PRESSURE:
/* uncompensated field zero
temperature data*/
(uncomp_data + index)->temp_adcv = (u32)(((((u32)a_data_u8[
BME680_DATA_FRAME_TEMPERATURE1_MSB_DATA + offset]))
<< 12) | ((((u32)a_data_u8[
BME680_DATA_FRAME_TEMPERATURE1_LSB_DATA + offset]))
<< 4) | ((u32)a_data_u8[
BME680_DATA_FRAME_TEMPERATURE1_XLSB_DATA + offset]
>> 4));
/* uncompensated field zero
pressure data*/
(uncomp_data + index)->pres_adcv = (u32)(((((u32)a_data_u8[
BME680_DATA_FRAME_PRESSURE_MSB_DATA + offset])) << 12) |
((((u32)a_data_u8[BME680_DATA_FRAME_PRESSURE_LSB_DATA
+ offset])) << 4) | ((u32)a_data_u8[
BME680_DATA_FRAME_PRESSURE_XLSB_DATA + offset] >> 4));
break;
case BME680_TEMPERATURE:
/* uncompensated field zero
temperature data*/
(uncomp_data + index)->temp_adcv = (u32)(((((u32)a_data_u8[
BME680_DATA_FRAME_TEMPERATURE1_MSB_DATA + offset]))
<< 12) | ((((u32)a_data_u8[
BME680_DATA_FRAME_TEMPERATURE1_LSB_DATA + offset]))
<< 4) | ((u32)a_data_u8[
BME680_DATA_FRAME_TEMPERATURE1_XLSB_DATA + offset]
>> 4));
break;
case BME680_HUMIDITY:
/* uncompensated field zero
temperature data*/
(uncomp_data + index)->temp_adcv = (u32)(((((u32)a_data_u8[
BME680_DATA_FRAME_TEMPERATURE1_MSB_DATA + offset]))
<< 12) | ((((u32)a_data_u8[
BME680_DATA_FRAME_TEMPERATURE1_LSB_DATA + offset]))
<< 4) | ((u32)a_data_u8[
BME680_DATA_FRAME_TEMPERATURE1_XLSB_DATA + offset]
>> 4));
/* uncompensated field zero
humidity data*/
(uncomp_data + index)->hum_adcv = (u16)(((((u16)a_data_u8[
BME680_DATA_FRAME_HUMIDITY_MSB_DATA + offset])) << 8)|
((a_data_u8[BME680_DATA_FRAME_HUMIDITY_LSB_DATA +
offset])));
break;
case BME680_GAS:
/* Gas values are updated
only if gas valid is set */
/* uncompensated field zero Gas data*/
if (BME680_TRUE == (uncomp_data + index)->status.gas_valid) {
(uncomp_data + index)->gas_res_adcv =
(u16)(((((u16)a_data_u8[
BME680_DATA_FRAME_GAS_MSB_DATA + offset])) << 2)
| ((((u16)a_data_u8[
BME680_DATA_FRAME_GAS_LSB_DATA + offset])
& BME680_GAS_BIT_MASK) >> 6));
}
break;
case BME680_ALL:
/* uncompensated field zero
pressure data*/
(uncomp_data + index)->pres_adcv = (u32)
(((((u32)a_data_u8[BME680_DATA_FRAME_PRESSURE_MSB_DATA +
offset])) << 12) | ((((u32)a_data_u8[
BME680_DATA_FRAME_PRESSURE_LSB_DATA + offset])) << 4) |
((u32)a_data_u8[BME680_DATA_FRAME_PRESSURE_XLSB_DATA +
offset] >> 4));
/* uncompensated field zero
temperature data*/
(uncomp_data + index)->temp_adcv = (u32)(((((u32)a_data_u8[
BME680_DATA_FRAME_TEMPERATURE1_MSB_DATA + offset]))
<< 12) | ((((u32)a_data_u8[
BME680_DATA_FRAME_TEMPERATURE1_LSB_DATA + offset]))
<< 4) | ((u32)a_data_u8[
BME680_DATA_FRAME_TEMPERATURE1_XLSB_DATA + offset]
>> 4));
/* uncompensated field zero
humidity data*/
(uncomp_data + index)->hum_adcv = (u16)(((((u16)a_data_u8[
BME680_DATA_FRAME_HUMIDITY_MSB_DATA + offset])) << 8)|
((a_data_u8[BME680_DATA_FRAME_HUMIDITY_LSB_DATA +
offset])));
/* Gas values are updated
only if gas valid is set */
/* uncompensated field zero Gas data*/
if (BME680_TRUE == (uncomp_data + index)->status.gas_valid) {
(uncomp_data + index)->gas_res_adcv =
(u16)(((((u16)a_data_u8[
BME680_DATA_FRAME_GAS_MSB_DATA
+ offset])) << 2) | ((((u16)a_data_u8[
BME680_DATA_FRAME_GAS_LSB_DATA + offset]) &
BME680_GAS_BIT_MASK) >> 6));
}
break;
}
}
static void bme680_packing_calib_param(u8 *a_data_u8, struct bme680_t *bme680)
{
/* read temperature calibration*/
bme680->cal_param.par_T1 = (u16)((((u16)(a_data_u8[DIG_T1_MSB_REG]))
<< 8) | a_data_u8[DIG_T1_LSB_REG]);
bme680->cal_param.par_T2 = (s16)(((((u16)a_data_u8[DIG_T2_MSB_REG]))
<< 8) | a_data_u8[DIG_T2_LSB_REG]);
bme680->cal_param.par_T3 = (s8)(a_data_u8[DIG_T3_REG]);
/* read pressure calibration*/
bme680->cal_param.par_P1 = (u16)((((u16)(a_data_u8[DIG_P1_MSB_REG])) <<
8) | a_data_u8[DIG_P1_LSB_REG]);
bme680->cal_param.par_P2 = (s16)(((((u16)a_data_u8[DIG_P2_MSB_REG]))
<< 8) | a_data_u8[DIG_P2_LSB_REG]);
bme680->cal_param.par_P3 = (s8)a_data_u8[DIG_P3_REG];
bme680->cal_param.par_P4 = (s16)(((((u16)a_data_u8[DIG_P4_MSB_REG]))
<< 8) | a_data_u8[DIG_P4_LSB_REG]);
bme680->cal_param.par_P5 = (s16)(((((u16)a_data_u8[DIG_P5_MSB_REG]))
<< 8) | a_data_u8[DIG_P5_LSB_REG]);
bme680->cal_param.par_P6 = (s8)(a_data_u8[DIG_P6_REG]);
bme680->cal_param.par_P7 = (s8)(a_data_u8[DIG_P7_REG]);
bme680->cal_param.par_P8 = (s16)(((((u16)a_data_u8[DIG_P8_MSB_REG]))
<< 8) | a_data_u8[DIG_P8_LSB_REG]);
bme680->cal_param.par_P9 = (s16)(((((u16)a_data_u8[DIG_P9_MSB_REG]))
<< 8) | a_data_u8[DIG_P9_LSB_REG]);
bme680->cal_param.par_P10 = (u8)(a_data_u8[DIG_P10_REG]);
/* read humidity calibration*/
bme680->cal_param.par_H1 = (u16)(((((u16)a_data_u8[DIG_H1_MSB_REG]))
<< 4) | (a_data_u8[DIG_H1_LSB_REG] & BME680_BIT_MASK_H1_DATA));
bme680->cal_param.par_H2 = (u16)(((((u16)a_data_u8[DIG_H2_MSB_REG]))
<< 4) | ((a_data_u8[DIG_H2_LSB_REG]) >> 4));
bme680->cal_param.par_H3 = (s8)a_data_u8[DIG_H3_REG];
bme680->cal_param.par_H4 = (s8) a_data_u8[DIG_H4_REG];
bme680->cal_param.par_H5 = (s8) a_data_u8[DIG_H5_REG];
bme680->cal_param.par_H6 = (u8)a_data_u8[DIG_H6_REG];
bme680->cal_param.par_H7 = (s8)a_data_u8[DIG_H7_REG];
/* read gas calibration*/
bme680->cal_param.par_GH1 = (s8)a_data_u8[DIG_GH1_REG];
bme680->cal_param.par_GH2 = (s16)(((((u16)a_data_u8[DIG_GH2_MSB_REG]))
<<8) | a_data_u8[DIG_GH2_LSB_REG]);
bme680->cal_param.par_GH3 = (s8)a_data_u8[DIG_GH3_REG];
}
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