diff --git a/BME680_driver b/BME680_driver deleted file mode 160000 index 2a51b9c..0000000 --- a/BME680_driver +++ /dev/null @@ -1 +0,0 @@ -Subproject commit 2a51b9c0c1899f28e561e6701caa22cb23201cfc diff --git a/BME680_driver/Makefile b/BME680_driver/Makefile new file mode 100644 index 0000000..e5e929d --- /dev/null +++ b/BME680_driver/Makefile @@ -0,0 +1,9 @@ +all: main + +lib: + gcc -c -fpic bme680.c + ar rcs libbme680.a bme680.o + gcc -shared -o libbme680.so bme680.o + +main: lib + gcc main.c -L. -static -lbme680 -o main diff --git a/BME680_driver/README.md b/BME680_driver/README.md new file mode 100644 index 0000000..5cf73d2 --- /dev/null +++ b/BME680_driver/README.md @@ -0,0 +1,239 @@ +# BME680 sensor API +## Introduction +This package contains the Bosch Sensortec's BME680 gas sensor API + +The sensor driver package includes bme680.h, bme680.c and bme680_defs.h files + +## Version +File | Version | Date +-----|---------|----- +bme680.c | 3.5.1 | 5 Jul 2017 +bme680.h | 3.5.1 | 5 Jul 2017 +bme680_defs.h | 3.5.1 | 5 Jul 2017 + +## Integration details +* Integrate bme680.h, bme680_defs.h and bme680.c file in to your project. +* Include the bme680.h file in your code like below. +``` c +#include "bme680.h" +``` + +## File information +* bme680_defs.h : This header file has the constants, macros and datatype declarations. +* bme680.h : This header file contains the declarations of the sensor driver APIs. +* bme680.c : This source file contains the definitions of the sensor driver APIs. + +## Supported sensor interfaces +* SPI 4-wire +* I2C + +## Usage guide +### Initializing the sensor +To initialize the sensor, you will first need to create a device structure. You +can do this by creating an instance of the structure bme680_dev. Then go on to +fill in the various parameters as shown below + +#### Example for SPI 4-Wire +``` c + struct bme680_dev gas_sensor; + + /* You may assign a chip select identifier to be handled later */ + gas_sensor.dev_id = 0; + gas_sensor.intf = BME680_SPI_INTF; + gas_sensor.read = user_spi_read; + gas_sensor.write = user_spi_write; + gas_sensor.delay_ms = user_delay_ms; + + int8_t rslt = BME680_OK; + rslt = bme680_init(&gas_sensor); +``` + +#### Example for I2C +``` c + struct bme680_dev gas_sensor; + + gas_sensor.dev_id = BME680_I2C_ADDR_PRIMARY; + gas_sensor.intf = BME680_I2C_INTF; + gas_sensor.read = user_i2c_read; + gas_sensor.write = user_i2c_write; + gas_sensor.delay_ms = user_delay_ms; + + int8_t rslt = BME680_OK; + rslt = bme680_init(&gas_sensor); +``` + +### Configuring the sensor +#### Example for configuring the sensor in forced mode +``` c + uint8_t set_required_settings; + + /* Set the temperature, pressure and humidity settings */ + gas_sensor.tph_sett.os_hum = BME680_OS_2X; + gas_sensor.tph_sett.os_pres = BME680_OS_4X; + gas_sensor.tph_sett.os_temp = BME680_OS_8X; + gas_sensor.tph_sett.filter = BME680_FILTER_SIZE_3; + + /* Set the remaining gas sensor settings and link the heating profile */ + gas_sensor.gas_sett.run_gas = BME680_ENABLE_GAS_MEAS; + /* Create a ramp heat waveform in 3 steps */ + gas_sensor.gas_sett.heatr_temp = 320; /* degree Celsius */ + gas_sensor.gas_sett.heatr_dur = 150; /* milliseconds */ + + /* Select the power mode */ + /* Must be set before writing the sensor configuration */ + gas_sensor.power_mode = BME680_FORCED_MODE; + + /* Set the required sensor settings needed */ + set_required_settings = BME680_OST_SEL | BME680_OSP_SEL | BME680_OSH_SEL | BME680_FILTER_SEL + | BME680_GAS_SENSOR_SEL; + + /* Set the desired sensor configuration */ + rslt = bme680_set_sensor_settings(set_required_settings,&gas_sensor); + + /* Set the power mode */ + rslt = bme680_set_sensor_mode(&gas_sensor); + + /* Get the total measurement duration so as to sleep or wait till the + * measurement is complete */ + uint16_t meas_period; + bme680_get_profile_dur(&meas_period, &gas_sensor); + user_delay_ms(meas_period); /* Delay till the measurement is ready */ +``` + +### Reading sensor data +#### Example for reading all sensor data +``` c + struct bme680_field_data data; + + while(1) + { + rslt = bme680_get_sensor_data(&data, &gas_sensor); + + printf("T: %.2f degC, P: %.2f hPa, H %.2f %%rH ", data.temperature / 100.0f, + data.pressure / 100.0f, data.humidity / 1000.0f ); + /* Avoid using measurements from an unstable heating setup */ + if(data.status & BME680_HEAT_STAB_MSK) + printf(", G: %d ohms", data.gas_resistance); + + printf("\r\n"); + } +``` + +### Templates for function pointers +``` c + +void user_delay_ms(uint32_t period) +{ + /* + * Return control or wait, + * for a period amount of milliseconds + */ +} + +int8_t user_spi_read(uint8_t dev_id, uint8_t reg_addr, uint8_t *reg_data, uint16_t len) +{ + int8_t rslt = 0; /* Return 0 for Success, non-zero for failure */ + + /* + * The parameter dev_id can be used as a variable to select which Chip Select pin has + * to be set low to activate the relevant device on the SPI bus + */ + + /* + * Data on the bus should be like + * |----------------+---------------------+-------------| + * | MOSI | MISO | Chip Select | + * |----------------+---------------------|-------------| + * | (don't care) | (don't care) | HIGH | + * | (reg_addr) | (don't care) | LOW | + * | (don't care) | (reg_data[0]) | LOW | + * | (....) | (....) | LOW | + * | (don't care) | (reg_data[len - 1]) | LOW | + * | (don't care) | (don't care) | HIGH | + * |----------------+---------------------|-------------| + */ + + return rslt; +} + +int8_t user_spi_write(uint8_t dev_id, uint8_t reg_addr, uint8_t *reg_data, uint16_t len) +{ + int8_t rslt = 0; /* Return 0 for Success, non-zero for failure */ + + /* + * The parameter dev_id can be used as a variable to select which Chip Select pin has + * to be set low to activate the relevant device on the SPI bus + */ + + /* + * Data on the bus should be like + * |---------------------+--------------+-------------| + * | MOSI | MISO | Chip Select | + * |---------------------+--------------|-------------| + * | (don't care) | (don't care) | HIGH | + * | (reg_addr) | (don't care) | LOW | + * | (reg_data[0]) | (don't care) | LOW | + * | (....) | (....) | LOW | + * | (reg_data[len - 1]) | (don't care) | LOW | + * | (don't care) | (don't care) | HIGH | + * |---------------------+--------------|-------------| + */ + + return rslt; +} + +int8_t user_i2c_read(uint8_t dev_id, uint8_t reg_addr, uint8_t *reg_data, uint16_t len) +{ + int8_t rslt = 0; /* Return 0 for Success, non-zero for failure */ + + /* + * The parameter dev_id can be used as a variable to store the I2C address of the device + */ + + /* + * Data on the bus should be like + * |------------+---------------------| + * | I2C action | Data | + * |------------+---------------------| + * | Start | - | + * | Write | (reg_addr) | + * | Stop | - | + * | Start | - | + * | Read | (reg_data[0]) | + * | Read | (....) | + * | Read | (reg_data[len - 1]) | + * | Stop | - | + * |------------+---------------------| + */ + + return rslt; +} + +int8_t user_i2c_write(uint8_t dev_id, uint8_t reg_addr, uint8_t *reg_data, uint16_t len) +{ + int8_t rslt = 0; /* Return 0 for Success, non-zero for failure */ + + /* + * The parameter dev_id can be used as a variable to store the I2C address of the device + */ + + /* + * Data on the bus should be like + * |------------+---------------------| + * | I2C action | Data | + * |------------+---------------------| + * | Start | - | + * | Write | (reg_addr) | + * | Write | (reg_data[0]) | + * | Write | (....) | + * | Write | (reg_data[len - 1]) | + * | Stop | - | + * |------------+---------------------| + */ + + return rslt; +} + +``` + +## Copyright (C) 2017 - 2018 Bosch Sensortec GmbH \ No newline at end of file diff --git a/BME680_driver/Self test/bme680_selftest.c b/BME680_driver/Self test/bme680_selftest.c new file mode 100644 index 0000000..c804859 --- /dev/null +++ b/BME680_driver/Self test/bme680_selftest.c @@ -0,0 +1,189 @@ +/**\mainpage + * Copyright (C) 2017 - 2018 Bosch Sensortec GmbH + * + * 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_selftest.c + * @date 5 Jul 2017 + * @version 3.5.1 + * + */ + +/*! + * @addtogroup bme680_selftest + * @brief + * @{*/ + +#include "bme680_selftest.h" + +#define MIN_TEMPERATURE INT16_C(0) /* 0 degree Celsius */ +#define MAX_TEMPERATURE INT16_C(4000) /* 40 degree Celsius */ + +#define MIN_PRESSURE UINT32_C(90000) /* 900 hecto Pascals */ +#define MAX_PRESSURE UINT32_C(110000) /* 1100 hecto Pascals */ + +#define MIN_HUMIDITY UINT32_C(20000) /* 20% relative humidity */ +#define MAX_HUMIDITY UINT32_C(80000) /* 80% relative humidity*/ + +#define HEATR_DUR 2000 +#define N_MEAS 6 +#define LOW_TEMP 200 +#define HIGH_TEMP 350 + +/*! + * @brief Function to analyze the sensor data + * + * @param[in] data Array of measurement data + * @param[in] n_meas Number of measurements + * + * @return Error code + * @retval 0 Success + * @retval > 0 Warning + */ +static int8_t analyze_sensor_data(struct bme680_field_data *data, uint8_t n_meas); + +/*! + * @brief Self-test API for the BME680 + */ +int8_t bme680_self_test(struct bme680_dev *dev) +{ + int8_t rslt = BME680_OK; + struct bme680_field_data data[N_MEAS]; + + struct bme680_dev t_dev; + + /* Copy required parameters from reference bme680_dev struct */ + t_dev.dev_id = dev->dev_id; + t_dev.amb_temp = 25; + t_dev.read = dev->read; + t_dev.write = dev->write; + t_dev.intf = dev->intf; + t_dev.delay_ms = dev->delay_ms; + + rslt = bme680_init(&t_dev); + + if (rslt == BME680_OK) { + /* Select the power mode */ + /* Must be set before writing the sensor configuration */ + t_dev.power_mode = BME680_FORCED_MODE; + + uint16_t settings_sel; + + /* Set the temperature, pressure and humidity & filter settings */ + t_dev.tph_sett.os_hum = BME680_OS_1X; + t_dev.tph_sett.os_pres = BME680_OS_16X; + t_dev.tph_sett.os_temp = BME680_OS_2X; + + /* Set the remaining gas sensor settings and link the heating profile */ + t_dev.gas_sett.run_gas = BME680_ENABLE_GAS_MEAS; + t_dev.gas_sett.heatr_dur = HEATR_DUR; + + settings_sel = BME680_OST_SEL | BME680_OSP_SEL | BME680_OSH_SEL | BME680_GAS_SENSOR_SEL; + + uint16_t profile_dur = 0; + bme680_get_profile_dur(&profile_dur, &t_dev); + + uint8_t i = 0; + while ((rslt == BME680_OK) && (i < N_MEAS)) { + if (rslt == BME680_OK) { + + if (i % 2 == 0) + t_dev.gas_sett.heatr_temp = LOW_TEMP; /* Lower temperature */ + else + t_dev.gas_sett.heatr_temp = HIGH_TEMP; /* Higher temperature */ + + rslt = bme680_set_sensor_settings(settings_sel, &t_dev); + + if (rslt == BME680_OK) { + + rslt = bme680_set_sensor_mode(&t_dev); /* Trigger a measurement */ + + t_dev.delay_ms(profile_dur); /* Wait for the measurement to complete */ + + rslt = bme680_get_sensor_data(&data[i], &t_dev); + } + } + + i++; + } + + if (rslt == BME680_OK) + rslt = analyze_sensor_data(data, N_MEAS); + } + + return rslt; +} + +/*! + * @brief Function to analyze the sensor data + */ +static int8_t analyze_sensor_data(struct bme680_field_data *data, uint8_t n_meas) +{ + int8_t rslt = BME680_OK; + uint8_t self_test_failed = 0, i; + uint32_t cent_res = 0; + + if ((data[0].temperature < MIN_TEMPERATURE) || (data[0].temperature > MAX_TEMPERATURE)) + self_test_failed++; + + if ((data[0].pressure < MIN_PRESSURE) || (data[0].pressure > MAX_PRESSURE)) + self_test_failed++; + + if ((data[0].humidity < MIN_HUMIDITY) || (data[0].humidity > MAX_HUMIDITY)) + self_test_failed++; + + for (i = 0; i < n_meas; i++) /* Every gas measurement should be valid */ + if (!(data[i].status & (BME680_GASM_VALID_MSK | BME680_HEAT_STAB_MSK))) + self_test_failed++; + + for (i = 2; i < n_meas; i += 2) { + /* Invert formula to get integer values for centroid resistance, i.e. > 1 */ + cent_res = (data[i - 2].gas_resistance + data[i].gas_resistance) / (2 * data[i - 1].gas_resistance); + } + + if ((cent_res < 3) || (cent_res > 20)) /* 0.05 > cent_res^-1 < 0.03 */ + self_test_failed++; + + if (self_test_failed) + rslt = BME680_W_SELF_TEST_FAILED; + + return rslt; +} + +/** @}*/ diff --git a/BME680_driver/Self test/bme680_selftest.h b/BME680_driver/Self test/bme680_selftest.h new file mode 100644 index 0000000..1b1be60 --- /dev/null +++ b/BME680_driver/Self test/bme680_selftest.h @@ -0,0 +1,88 @@ +/** + * Copyright (C) 2017 - 2018 Bosch Sensortec GmbH + * + * 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_selftest.h + * @date 5 Jul 2017 + * @version 3.5.1 + * @brief + * + */ + +/*! + * @addtogroup bme680_selftest + * @brief + * @{*/ + + +#ifndef BME680_SELFTEST_H_ +#define BME680_SELFTEST_H_ + +#include "bme680.h" + +/*! CPP guard */ +#ifdef __cplusplus +extern "C" +{ +#endif + +#define BME680_W_SELF_TEST_FAILED 3 + +/*! + * @brief Self-test API for the BME680 + * + * @param[in] Device structure containing relevant information on how + * to communicate with the sensor + * + * @return Error code + * @retval 0 Success + * @retval < 0 Error + * @retval > 0 Warning + */ +int8_t bme680_self_test(struct bme680_dev *dev); + +/*! CPP guard */ +#ifdef __cplusplus +} +#endif + +#endif /* BME680_SELFTEST_H_ */ + +/** @}*/ diff --git a/BME680_driver/bme680.c b/BME680_driver/bme680.c new file mode 100644 index 0000000..77ec9ff --- /dev/null +++ b/BME680_driver/bme680.c @@ -0,0 +1,1105 @@ +/**\mainpage + * Copyright (C) 2017 - 2018 Bosch Sensortec GmbH + * + * 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 + * @date 5 Jul 2017 + * @version 3.5.1 + * + */ + +/*! @file bme680.c + @brief Sensor driver for BME680 sensor */ +#include "bme680.h" + +/**static variables */ +/**Look up table for the possible gas range values */ +uint32_t lookupTable1[16] = { UINT32_C(2147483647), UINT32_C(2147483647), UINT32_C(2147483647), UINT32_C(2147483647), + UINT32_C(2147483647), UINT32_C(2126008810), UINT32_C(2147483647), UINT32_C(2130303777), UINT32_C(2147483647), + UINT32_C(2147483647), UINT32_C(2143188679), UINT32_C(2136746228), UINT32_C(2147483647), UINT32_C(2126008810), + UINT32_C(2147483647), UINT32_C(2147483647) }; +/**Look up table for the possible gas range values */ +uint32_t lookupTable2[16] = { UINT32_C(4096000000), UINT32_C(2048000000), UINT32_C(1024000000), UINT32_C(512000000), + UINT32_C(255744255), UINT32_C(127110228), UINT32_C(64000000), UINT32_C(32258064), UINT32_C(16016016), UINT32_C( + 8000000), UINT32_C(4000000), UINT32_C(2000000), UINT32_C(1000000), UINT32_C(500000), UINT32_C(250000), + UINT32_C(125000) }; + +/*! + * @brief This internal API is used to read the calibrated data from the sensor. + * + * This function is used to retrieve the calibration + * data from the image registers of the sensor. + * + * @note Registers 89h 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[in] dev :Structure instance of bme680_dev. + * + * @return Result of API execution status. + * @retval zero -> Success / +ve value -> Warning / -ve value -> Error + */ +static int8_t get_calib_data(struct bme680_dev *dev); + +/*! + * @brief This internal API is used to set the gas configuration of the sensor. + * + * @param[in] dev :Structure instance of bme680_dev. + * + * @return Result of API execution status. + * @retval zero -> Success / +ve value -> Warning / -ve value -> Error + */ +static int8_t set_gas_config(struct bme680_dev *dev); + +/*! + * @brief This internal API is used to get the gas configuration of the sensor. + * + * @param[in] dev :Structure instance of bme680_dev. + * + * @return Result of API execution status. + * @retval zero -> Success / +ve value -> Warning / -ve value -> Error + */ +static int8_t get_gas_config(struct bme680_dev *dev); + +/*! + * @brief This internal API is used to calculate the Heat duration value. + * + * @param[in] dur :Value of the duration to be shared. + * + * @return uint8_t threshold duration after calculation. + */ +static uint8_t calc_heater_dur(uint16_t dur); + +/*! + * @brief This internal API is used to calculate the temperature value. + * + * @param[in] dev :Structure instance of bme680_dev. + * @param[in] temp_adc :Contains the temperature ADC value . + * + * @return uint32_t calculated temperature. + */ +//static int16_t calc_temperature(uint32_t temp_adc, struct bme680_dev *dev); + +/*! + * @brief This internal API is used to calculate the pressure value. + * + * @param[in] dev :Structure instance of bme680_dev. + * @param[in] pres_adc :Contains the pressure ADC value . + * + * @return uint32_t calculated pressure. + */ +//static uint32_t calc_pressure(uint32_t pres_adc, const struct bme680_dev *dev); + +/*! + * @brief This internal API is used to calculate the humidity value. + * + * @param[in] dev :Structure instance of bme680_dev. + * @param[in] hum_adc :Contains the humidity ADC value. + * + * @return uint32_t calculated humidity. + */ +static uint32_t calc_humidity(uint16_t hum_adc, const struct bme680_dev *dev); + +/*! + * @brief This internal API is used to calculate the Gas Resistance value. + * + * @param[in] dev :Structure instance of bme680_dev. + * @param[in] gas_res_adc :Contains the Gas Resistance ADC value. + * @param[in] gas_range :Contains the range of gas values. + * + * @return uint32_t calculated gas resistance. + */ +static uint32_t calc_gas_resistance(uint16_t gas_res_adc, uint8_t gas_range, const struct bme680_dev *dev); + +/*! + * @brief This internal API is used to calculate the Heat Resistance value. + * + * @param[in] dev :Structure instance of bme680_dev. + * @param[in] temp :Contains the temporary value. + * + * @return uint8_t calculated heater resistance. + */ +static uint8_t calc_heater_res(uint16_t temp, const struct bme680_dev *dev); + +/*! + * @brief This internal API is used to calculate the field data of sensor. + * + * @param[out] data :Structure instance to hold the data + * @param[in] dev :Structure instance of bme680_dev. + * + * @return int8_t result of the field data from sensor. + */ +static int8_t read_field_data(struct bme680_field_data *data, struct bme680_dev *dev); + +/*! + * @brief This internal API is used to set the memory page + * based on register address. + * + * The value of memory page + * value | Description + * --------|-------------- + * 0 | BME680_PAGE0_SPI + * 1 | BME680_PAGE1_SPI + * + * @param[in] dev :Structure instance of bme680_dev. + * @param[in] reg_addr :Contains the register address array. + * + * @return Result of API execution status + * @retval zero -> Success / +ve value -> Warning / -ve value -> Error + */ +static int8_t set_mem_page(uint8_t reg_addr, struct bme680_dev *dev); + +/*! + * @brief This internal API is used to get the memory page based + * on register address. + * + * The value of memory page + * value | Description + * --------|-------------- + * 0 | BME680_PAGE0_SPI + * 1 | BME680_PAGE1_SPI + * + * @param[in] dev :Structure instance of bme680_dev. + * + * @return Result of API execution status + * @retval zero -> Success / +ve value -> Warning / -ve value -> Error + */ +static int8_t get_mem_page(struct bme680_dev *dev); + +/*! + * @brief This internal API is used to validate the device pointer for + * null conditions. + * + * @param[in] dev :Structure instance of bme680_dev. + * + * @return Result of API execution status + * @retval zero -> Success / +ve value -> Warning / -ve value -> Error + */ +static int8_t null_ptr_check(const struct bme680_dev *dev); + +/*! + * @brief This internal API is used to check the boundary + * conditions. + * + * @param[in] value :pointer to the value. + * @param[in] min :minimum value. + * @param[in] max :maximum value. + * @param[in] dev :Structure instance of bme680_dev. + * + * @return Result of API execution status + * @retval zero -> Success / +ve value -> Warning / -ve value -> Error + */ +static int8_t boundary_check(uint8_t *value, uint8_t min, uint8_t max, struct bme680_dev *dev); + +/****************** Global Function Definitions *******************************/ +/*! + *@brief This API is the entry point. + *It reads the chip-id and calibration data from the sensor. + */ +int8_t bme680_init(struct bme680_dev *dev) +{ + int8_t rslt; + + /* Check for null pointer in the device structure*/ + rslt = null_ptr_check(dev); + if (rslt == BME680_OK) + { + /* Soft reset to restore it to default values*/ + rslt = bme680_soft_reset(dev); + + if (rslt == BME680_OK) { + rslt = bme680_get_regs(BME680_CHIP_ID_ADDR, &dev->chip_id, 1, dev); + if (rslt == BME680_OK) { + if (dev->chip_id == BME680_CHIP_ID) { + rslt = get_calib_data(dev); + } else { + rslt = BME680_E_DEV_NOT_FOUND; + } + } + } + } + + return rslt; +} + +/*! + * @brief This API reads the data from the given register address of the sensor. + */ +int8_t bme680_get_regs(uint8_t reg_addr, uint8_t *reg_data, uint16_t len, struct bme680_dev *dev) +{ + int8_t rslt; + + /* Check for null pointer in the device structure*/ + rslt = null_ptr_check(dev); + if (rslt == BME680_OK) { + if (dev->intf == BME680_SPI_INTF) { + /* Set the memory page */ + rslt = set_mem_page(reg_addr, dev); + if (rslt == BME680_OK) + reg_addr = reg_addr | BME680_SPI_RD_MSK; + } + dev->com_rslt = dev->read(dev->dev_id, reg_addr, reg_data, len); + if (dev->com_rslt != 0) + rslt = BME680_E_COM_FAIL; + } + + return rslt; +} + +/*! + * @brief This API writes the given data to the register address + * of the sensor. + */ +int8_t bme680_set_regs(const uint8_t *reg_addr, const uint8_t *reg_data, uint8_t len, struct bme680_dev *dev) +{ + int8_t rslt; + /* Length of the temporary buffer is 2*(length of register)*/ + uint8_t tmp_buff[BME680_TMP_BUFFER_LENGTH] = { 0 }; + uint16_t index; + + /* Check for null pointer in the device structure*/ + rslt = null_ptr_check(dev); + if (rslt == BME680_OK) { + if ((len > 0) && (len < BME680_TMP_BUFFER_LENGTH / 2)) { + /* Interleave the 2 arrays */ + for (index = 0; index < len; index++) { + if (dev->intf == BME680_SPI_INTF) { + /* Set the memory page */ + rslt = set_mem_page(reg_addr[index], dev); + tmp_buff[(2 * index)] = reg_addr[index] & BME680_SPI_WR_MSK; + } else { + tmp_buff[(2 * index)] = reg_addr[index]; + } + tmp_buff[(2 * index) + 1] = reg_data[index]; + } + /* Write the interleaved array */ + if (rslt == BME680_OK) { + dev->com_rslt = dev->write(dev->dev_id, tmp_buff[0], &tmp_buff[1], (2 * len) - 1); + if (dev->com_rslt != 0) + rslt = BME680_E_COM_FAIL; + } + } else { + rslt = BME680_E_INVALID_LENGTH; + } + } + + return rslt; +} + +/*! + * @brief This API performs the soft reset of the sensor. + */ +int8_t bme680_soft_reset(struct bme680_dev *dev) +{ + int8_t rslt; + uint8_t reg_addr = BME680_SOFT_RESET_ADDR; + /* 0xb6 is the soft reset command */ + uint8_t soft_rst_cmd = BME680_SOFT_RESET_CMD; + + /* Check for null pointer in the device structure*/ + rslt = null_ptr_check(dev); + if (rslt == BME680_OK) { + if (dev->intf == BME680_SPI_INTF) + rslt = get_mem_page(dev); + + /* Reset the device */ + if (rslt == BME680_OK) { + rslt = bme680_set_regs(®_addr, &soft_rst_cmd, 1, dev); + /* Wait for 5ms */ + dev->delay_ms(BME680_RESET_PERIOD); + + if (rslt == BME680_OK) { + /* After reset get the memory page */ + if (dev->intf == BME680_SPI_INTF) + rslt = get_mem_page(dev); + } + } + } + + return rslt; +} + +/*! + * @brief This API is used to set the oversampling, filter and T,P,H, gas selection + * settings in the sensor. + */ +int8_t bme680_set_sensor_settings(uint16_t desired_settings, struct bme680_dev *dev) +{ + int8_t rslt; + uint8_t reg_addr; + uint8_t data = 0; + uint8_t count = 0; + uint8_t reg_array[BME680_REG_BUFFER_LENGTH] = { 0 }; + uint8_t data_array[BME680_REG_BUFFER_LENGTH] = { 0 }; + uint8_t intended_power_mode = dev->power_mode; /* Save intended power mode */ + + /* Check for null pointer in the device structure*/ + rslt = null_ptr_check(dev); + if (rslt == BME680_OK) { + if (desired_settings & BME680_GAS_MEAS_SEL) + rslt = set_gas_config(dev); + + dev->power_mode = BME680_SLEEP_MODE; + if (rslt == BME680_OK) + rslt = bme680_set_sensor_mode(dev); + + /* Selecting the filter */ + if (desired_settings & BME680_FILTER_SEL) { + rslt = boundary_check(&dev->tph_sett.filter, BME680_FILTER_SIZE_0, BME680_FILTER_SIZE_127, dev); + reg_addr = BME680_CONF_ODR_FILT_ADDR; + + if (rslt == BME680_OK) + rslt = bme680_get_regs(reg_addr, &data, 1, dev); + + if (desired_settings & BME680_FILTER_SEL) + data = BME680_SET_BITS(data, BME680_FILTER, dev->tph_sett.filter); + + reg_array[count] = reg_addr; /* Append configuration */ + data_array[count] = data; + count++; + } + + /* Selecting heater control for the sensor */ + if (desired_settings & BME680_HCNTRL_SEL) { + rslt = boundary_check(&dev->gas_sett.heatr_ctrl, BME680_ENABLE_HEATER, BME680_DISABLE_HEATER, dev); + reg_addr = BME680_CONF_HEAT_CTRL_ADDR; + + if (rslt == BME680_OK) + rslt = bme680_get_regs(reg_addr, &data, 1, dev); + data = BME680_SET_BITS_POS_0(data, BME680_HCTRL, dev->gas_sett.heatr_ctrl); + + reg_array[count] = reg_addr; /* Append configuration */ + data_array[count] = data; + count++; + } + + /* Selecting heater T,P oversampling for the sensor */ + if (desired_settings & (BME680_OST_SEL | BME680_OSP_SEL)) { + rslt = boundary_check(&dev->tph_sett.os_temp, BME680_OS_NONE, BME680_OS_16X, dev); + reg_addr = BME680_CONF_T_P_MODE_ADDR; + + if (rslt == BME680_OK) + rslt = bme680_get_regs(reg_addr, &data, 1, dev); + + if (desired_settings & BME680_OST_SEL) + data = BME680_SET_BITS(data, BME680_OST, dev->tph_sett.os_temp); + + if (desired_settings & BME680_OSP_SEL) + data = BME680_SET_BITS(data, BME680_OSP, dev->tph_sett.os_pres); + + reg_array[count] = reg_addr; + data_array[count] = data; + count++; + } + + /* Selecting humidity oversampling for the sensor */ + if (desired_settings & BME680_OSH_SEL) { + rslt = boundary_check(&dev->tph_sett.os_hum, BME680_OS_NONE, BME680_OS_16X, dev); + reg_addr = BME680_CONF_OS_H_ADDR; + + if (rslt == BME680_OK) + rslt = bme680_get_regs(reg_addr, &data, 1, dev); + data = BME680_SET_BITS_POS_0(data, BME680_OSH, dev->tph_sett.os_hum); + + reg_array[count] = reg_addr; /* Append configuration */ + data_array[count] = data; + count++; + } + + /* Selecting the runGas and NB conversion settings for the sensor */ + if (desired_settings & (BME680_RUN_GAS_SEL | BME680_NBCONV_SEL)) { + rslt = boundary_check(&dev->gas_sett.run_gas, BME680_RUN_GAS_DISABLE, BME680_RUN_GAS_ENABLE, dev); + if (rslt == BME680_OK) + rslt = boundary_check(&dev->gas_sett.nb_conv, BME680_NBCONV_MIN, BME680_NBCONV_MAX, dev); + reg_addr = BME680_CONF_ODR_RUN_GAS_NBC_ADDR; + + if (rslt == BME680_OK) + rslt = bme680_get_regs(reg_addr, &data, 1, dev); + + if (desired_settings & BME680_RUN_GAS_SEL) + data = BME680_SET_BITS(data, BME680_RUN_GAS, dev->gas_sett.run_gas); + + if (desired_settings & BME680_NBCONV_SEL) + data = BME680_SET_BITS_POS_0(data, BME680_NBCONV, dev->gas_sett.nb_conv); + + reg_array[count] = reg_addr; /* Append configuration */ + data_array[count] = data; + count++; + } + + if (rslt == BME680_OK) + rslt = bme680_set_regs(reg_array, data_array, count, dev); + + /* Restore previous intended power mode */ + dev->power_mode = intended_power_mode; + } + + return rslt; +} + +/*! + * @brief This API is used to get the oversampling, filter and T,P,H, gas selection + * settings in the sensor. + */ +int8_t bme680_get_sensor_settings(uint16_t desired_settings, struct bme680_dev *dev) +{ + int8_t rslt; + /* starting address of the register array for burst read*/ + uint8_t reg_addr = BME680_CONF_HEAT_CTRL_ADDR; + uint8_t data_array[BME680_REG_BUFFER_LENGTH] = { 0 }; + + /* Check for null pointer in the device structure*/ + rslt = null_ptr_check(dev); + if (rslt == BME680_OK) { + rslt = bme680_get_regs(reg_addr, data_array, BME680_REG_BUFFER_LENGTH, dev); + + if (rslt == BME680_OK) { + if (desired_settings & BME680_GAS_MEAS_SEL) + rslt = get_gas_config(dev); + + /* get the T,P,H ,Filter,ODR settings here */ + if (desired_settings & BME680_FILTER_SEL) + dev->tph_sett.filter = BME680_GET_BITS(data_array[BME680_REG_FILTER_INDEX], BME680_FILTER); + + if (desired_settings & (BME680_OST_SEL | BME680_OSP_SEL)) { + dev->tph_sett.os_temp = BME680_GET_BITS(data_array[BME680_REG_TEMP_INDEX], BME680_OST); + dev->tph_sett.os_pres = BME680_GET_BITS(data_array[BME680_REG_PRES_INDEX], BME680_OSP); + } + + if (desired_settings & BME680_OSH_SEL) + dev->tph_sett.os_hum = BME680_GET_BITS_POS_0(data_array[BME680_REG_HUM_INDEX], BME680_OSH); + + /* get the gas related settings */ + if (desired_settings & BME680_HCNTRL_SEL) + dev->gas_sett.heatr_ctrl = BME680_GET_BITS_POS_0(data_array[BME680_REG_HCTRL_INDEX], BME680_HCTRL); + + if (desired_settings & (BME680_RUN_GAS_SEL | BME680_NBCONV_SEL)) { + dev->gas_sett.nb_conv = BME680_GET_BITS_POS_0(data_array[BME680_REG_NBCONV_INDEX], BME680_NBCONV); + dev->gas_sett.run_gas = BME680_GET_BITS(data_array[BME680_REG_RUN_GAS_INDEX], BME680_RUN_GAS); + } + } + } else { + rslt = BME680_E_NULL_PTR; + } + + return rslt; +} + +/*! + * @brief This API is used to set the power mode of the sensor. + */ +int8_t bme680_set_sensor_mode(struct bme680_dev *dev) +{ + int8_t rslt; + uint8_t tmp_pow_mode; + uint8_t pow_mode = 0; + uint8_t reg_addr = BME680_CONF_T_P_MODE_ADDR; + + /* Check for null pointer in the device structure*/ + rslt = null_ptr_check(dev); + if (rslt == BME680_OK) { + /* Call recursively until in sleep */ + do { + rslt = bme680_get_regs(BME680_CONF_T_P_MODE_ADDR, &tmp_pow_mode, 1, dev); + if (rslt == BME680_OK) { + /* Put to sleep before changing mode */ + pow_mode = (tmp_pow_mode & BME680_MODE_MSK); + + if (pow_mode != BME680_SLEEP_MODE) { + tmp_pow_mode = tmp_pow_mode & (~BME680_MODE_MSK); /* Set to sleep */ + rslt = bme680_set_regs(®_addr, &tmp_pow_mode, 1, dev); + dev->delay_ms(BME680_POLL_PERIOD_MS); + } + } + } while (pow_mode != BME680_SLEEP_MODE); + + /* Already in sleep */ + if (dev->power_mode != BME680_SLEEP_MODE) { + tmp_pow_mode = (tmp_pow_mode & ~BME680_MODE_MSK) | (dev->power_mode & BME680_MODE_MSK); + if (rslt == BME680_OK) + rslt = bme680_set_regs(®_addr, &tmp_pow_mode, 1, dev); + } + } + + return rslt; +} + +/*! + * @brief This API is used to get the power mode of the sensor. + */ +int8_t bme680_get_sensor_mode(struct bme680_dev *dev) +{ + int8_t rslt; + uint8_t mode; + + /* Check for null pointer in the device structure*/ + rslt = null_ptr_check(dev); + if (rslt == BME680_OK) { + rslt = bme680_get_regs(BME680_CONF_T_P_MODE_ADDR, &mode, 1, dev); + /* Masking the other register bit info*/ + dev->power_mode = mode & BME680_MODE_MSK; + } + + return rslt; +} + +/*! + * @brief This API is used to set the profile duration of the sensor. + */ +void bme680_set_profile_dur(uint16_t duration, struct bme680_dev *dev) +{ + uint32_t tph_dur; /* Calculate in us */ + + /* TPH measurement duration */ + tph_dur = ((uint32_t) (dev->tph_sett.os_temp + dev->tph_sett.os_pres + dev->tph_sett.os_hum) * UINT32_C(1963)); + tph_dur += UINT32_C(477 * 4); /* TPH switching duration */ + tph_dur += UINT32_C(477 * 5); /* Gas measurement duration */ + tph_dur += UINT32_C(500); /* Get it to the closest whole number.*/ + tph_dur /= UINT32_C(1000); /* Convert to ms */ + + tph_dur += UINT32_C(1); /* Wake up duration of 1ms */ + /* The remaining time should be used for heating */ + dev->gas_sett.heatr_dur = duration - (uint16_t) tph_dur; +} + +/*! + * @brief This API is used to get the profile duration of the sensor. + */ +void bme680_get_profile_dur(uint16_t *duration, struct bme680_dev *dev) +{ + uint32_t tph_dur; /* Calculate in us */ + + /* TPH measurement duration */ + tph_dur = ((uint32_t) (dev->tph_sett.os_temp + dev->tph_sett.os_pres + dev->tph_sett.os_hum) * UINT32_C(1963)); + tph_dur += UINT32_C(477 * 4); /* TPH switching duration */ + tph_dur += UINT32_C(477 * 5); /* Gas measurement duration */ + tph_dur += UINT32_C(500); /* Get it to the closest whole number.*/ + tph_dur /= UINT32_C(1000); /* Convert to ms */ + + tph_dur += UINT32_C(1); /* Wake up duration of 1ms */ + /* The remaining time should be used for heating */ + *duration = dev->gas_sett.heatr_dur + (uint16_t) tph_dur; +} + +/*! + * @brief This API reads the pressure, temperature and humidity and gas data + * from the sensor, compensates the data and store it in the bme680_data + * structure instance passed by the user. + */ +int8_t bme680_get_sensor_data(struct bme680_field_data *data, struct bme680_dev *dev) +{ + int8_t rslt; + + /* Check for null pointer in the device structure*/ + rslt = null_ptr_check(dev); + if (rslt == BME680_OK) { + /* Reading the sensor data in forced mode only */ + rslt = read_field_data(data, dev); + if (rslt == BME680_OK) { + if (data->status & BME680_NEW_DATA_MSK) + dev->new_fields = 1; + else + dev->new_fields = 0; + } + } + + return rslt; +} + +/*! + * @brief This internal API is used to read the calibrated data from the sensor. + */ +static int8_t get_calib_data(struct bme680_dev *dev) +{ + int8_t rslt; + uint8_t coeff_array[BME680_COEFF_SIZE] = { 0 }; + + /* Check for null pointer in the device structure*/ + rslt = null_ptr_check(dev); + if (rslt == BME680_OK) { + rslt = bme680_get_regs(BME680_COEFF_ADDR1, coeff_array, BME680_COEFF_ADDR1_LEN, dev); + /* Append the second half in the same array */ + if (rslt == BME680_OK) + rslt = bme680_get_regs(BME680_COEFF_ADDR2, &coeff_array[BME680_COEFF_ADDR1_LEN], BME680_COEFF_ADDR2_LEN, + dev); + + /* Temperature related coefficients */ + dev->calib.par_t1 = (uint16_t) (BME680_CONCAT_BYTES(coeff_array[BME680_T1_MSB_REG], + coeff_array[BME680_T1_LSB_REG])); + dev->calib.par_t2 = (int16_t) (BME680_CONCAT_BYTES(coeff_array[BME680_T2_MSB_REG], + coeff_array[BME680_T2_LSB_REG])); + dev->calib.par_t3 = (int8_t) (coeff_array[BME680_T3_REG]); + + /* Pressure related coefficients */ + dev->calib.par_p1 = (uint16_t) (BME680_CONCAT_BYTES(coeff_array[BME680_P1_MSB_REG], + coeff_array[BME680_P1_LSB_REG])); + dev->calib.par_p2 = (int16_t) (BME680_CONCAT_BYTES(coeff_array[BME680_P2_MSB_REG], + coeff_array[BME680_P2_LSB_REG])); + dev->calib.par_p3 = (int8_t) coeff_array[BME680_P3_REG]; + dev->calib.par_p4 = (int16_t) (BME680_CONCAT_BYTES(coeff_array[BME680_P4_MSB_REG], + coeff_array[BME680_P4_LSB_REG])); + dev->calib.par_p5 = (int16_t) (BME680_CONCAT_BYTES(coeff_array[BME680_P5_MSB_REG], + coeff_array[BME680_P5_LSB_REG])); + dev->calib.par_p6 = (int8_t) (coeff_array[BME680_P6_REG]); + dev->calib.par_p7 = (int8_t) (coeff_array[BME680_P7_REG]); + dev->calib.par_p8 = (int16_t) (BME680_CONCAT_BYTES(coeff_array[BME680_P8_MSB_REG], + coeff_array[BME680_P8_LSB_REG])); + dev->calib.par_p9 = (int16_t) (BME680_CONCAT_BYTES(coeff_array[BME680_P9_MSB_REG], + coeff_array[BME680_P9_LSB_REG])); + dev->calib.par_p10 = (uint8_t) (coeff_array[BME680_P10_REG]); + + /* Humidity related coefficients */ + dev->calib.par_h1 = (uint16_t) (((uint16_t) coeff_array[BME680_H1_MSB_REG] << BME680_HUM_REG_SHIFT_VAL) + | (coeff_array[BME680_H1_LSB_REG] & BME680_BIT_H1_DATA_MSK)); + dev->calib.par_h2 = (uint16_t) (((uint16_t) coeff_array[BME680_H2_MSB_REG] << BME680_HUM_REG_SHIFT_VAL) + | ((coeff_array[BME680_H2_LSB_REG]) >> BME680_HUM_REG_SHIFT_VAL)); + dev->calib.par_h3 = (int8_t) coeff_array[BME680_H3_REG]; + dev->calib.par_h4 = (int8_t) coeff_array[BME680_H4_REG]; + dev->calib.par_h5 = (int8_t) coeff_array[BME680_H5_REG]; + dev->calib.par_h6 = (uint8_t) coeff_array[BME680_H6_REG]; + dev->calib.par_h7 = (int8_t) coeff_array[BME680_H7_REG]; + + /* Gas heater related coefficients */ + dev->calib.par_gh1 = (int8_t) coeff_array[BME680_GH1_REG]; + dev->calib.par_gh2 = (int16_t) (BME680_CONCAT_BYTES(coeff_array[BME680_GH2_MSB_REG], + coeff_array[BME680_GH2_LSB_REG])); + dev->calib.par_gh3 = (int8_t) coeff_array[BME680_GH3_REG]; + + /* Other coefficients */ + uint8_t temp_var = 0; /* Temporary variable */ + + if (rslt == BME680_OK) { + rslt = bme680_get_regs(BME680_ADDR_RES_HEAT_RANGE_ADDR, &temp_var, 1, dev); + + dev->calib.res_heat_range = ((temp_var & BME680_RHRANGE_MSK) / 16); + if (rslt == BME680_OK) { + rslt = bme680_get_regs(BME680_ADDR_RES_HEAT_VAL_ADDR, &temp_var, 1, dev); + + dev->calib.res_heat_val = (int8_t) temp_var; + if (rslt == BME680_OK) + rslt = bme680_get_regs(BME680_ADDR_RANGE_SW_ERR_ADDR, &temp_var, 1, dev); + } + } + dev->calib.range_sw_err = ((int8_t) temp_var & (int8_t) BME680_RSERROR_MSK) / 16; + } + + return rslt; +} + +/*! + * @brief This internal API is used to set the gas configuration of the sensor. + */ +static int8_t set_gas_config(struct bme680_dev *dev) +{ + int8_t rslt; + + /* Check for null pointer in the device structure*/ + rslt = null_ptr_check(dev); + if (rslt == BME680_OK) { + + uint8_t reg_addr[2], reg_data[2]; + + if (dev->power_mode == BME680_FORCED_MODE) { + reg_addr[0] = BME680_RES_HEAT0_ADDR; + reg_data[0] = calc_heater_res(dev->gas_sett.heatr_temp, dev); + reg_addr[1] = BME680_GAS_WAIT0_ADDR; + reg_data[1] = calc_heater_dur(dev->gas_sett.heatr_dur); + dev->gas_sett.nb_conv = 0; + } else { + rslt = BME680_W_DEFINE_PWR_MODE; + } + if (rslt == BME680_OK) + rslt = bme680_set_regs(reg_addr, reg_data, 2, dev); + } + + return rslt; +} + +/*! + * @brief This internal API is used to get the gas configuration of the sensor. + */ +static int8_t get_gas_config(struct bme680_dev *dev) +{ + int8_t rslt; + /* starting address of the register array for burst read*/ + uint8_t reg_addr1 = BME680_ADDR_SENS_CONF_START; + uint8_t reg_addr2 = BME680_ADDR_GAS_CONF_START; + uint8_t data_array[BME680_GAS_HEATER_PROF_LEN_MAX] = { 0 }; + uint8_t index; + + /* Check for null pointer in the device structure*/ + rslt = null_ptr_check(dev); + if (rslt == BME680_OK) { + if (BME680_SPI_INTF == dev->intf) { + /* Memory page switch the SPI address*/ + rslt = set_mem_page(reg_addr1, dev); + } + + if (rslt == BME680_OK) { + rslt = bme680_get_regs(reg_addr1, data_array, BME680_GAS_HEATER_PROF_LEN_MAX, dev); + if (rslt == BME680_OK) { + for (index = 0; index < BME680_GAS_HEATER_PROF_LEN_MAX; index++) + dev->gas_sett.heatr_temp = data_array[index]; + } + + rslt = bme680_get_regs(reg_addr2, data_array, BME680_GAS_HEATER_PROF_LEN_MAX, dev); + if (rslt == BME680_OK) { + for (index = 0; index < BME680_GAS_HEATER_PROF_LEN_MAX; index++) + dev->gas_sett.heatr_dur = data_array[index]; + } + } + } + + return rslt; +} + +/*! + * @brief This internal API is used to calculate the temperature value. + */ +int16_t calc_temperature(uint32_t temp_adc, struct bme680_dev *dev) +{ + int64_t var1; + int64_t var2; + int64_t var3; + int16_t calc_temp; + + var1 = ((int32_t) temp_adc / 8) - ((int32_t) dev->calib.par_t1 * 2); + var2 = (var1 * (int32_t) dev->calib.par_t2) / 2048; + var3 = ((var1 / 2) * (var1 / 2)) / 4096; + var3 = ((var3) * ((int32_t) dev->calib.par_t3 * 16)) / 16384; + dev->calib.t_fine = (int32_t) (var2 + var3); + calc_temp = (int16_t) (((dev->calib.t_fine * 5) + 128) / 256); + + return calc_temp; +} + +/*! + * @brief This internal API is used to calculate the pressure value. + */ +uint32_t calc_pressure(uint32_t pres_adc, const struct bme680_dev *dev) +{ + int32_t var1; + int32_t var2; + int32_t var3; + int32_t calc_pres; + + var1 = (((int32_t) dev->calib.t_fine) / 2) - 64000; + var2 = ((var1 / 4) * (var1 / 4)) / 2048; + var2 = ((var2) * (int32_t) dev->calib.par_p6) / 4; + var2 = var2 + ((var1 * (int32_t) dev->calib.par_p5) * 2); + var2 = (var2 / 4) + ((int32_t) dev->calib.par_p4 * 65536); + var1 = ((var1 / 4) * (var1 / 4)) / 8192; + var1 = (((var1) * ((int32_t) dev->calib.par_p3 * 32)) / 8) + (((int32_t) dev->calib.par_p2 * var1) / 2); + var1 = var1 / 262144; + var1 = ((32768 + var1) * (int32_t) dev->calib.par_p1) / 32768; + calc_pres = (int32_t) (1048576 - pres_adc); + calc_pres = (int32_t) ((calc_pres - (var2 / 4096)) * (3125)); + calc_pres = ((calc_pres / var1) * 2); + var1 = ((int32_t) dev->calib.par_p9 * (int32_t) (((calc_pres / 8) * (calc_pres / 8)) / 8192)) / 4096; + var2 = ((int32_t) (calc_pres / 4) * (int32_t) dev->calib.par_p8) / 8192; + var3 = ((int32_t) (calc_pres / 256) * (int32_t) (calc_pres / 256) * (int32_t) (calc_pres / 256) + * (int32_t) dev->calib.par_p10) / 131072; + calc_pres = (int32_t) (calc_pres) + ((var1 + var2 + var3 + ((int32_t) dev->calib.par_p7 * 128)) / 16); + + return (uint32_t) calc_pres; +} + +/*! + * @brief This internal API is used to calculate the humidity value. + */ +static uint32_t calc_humidity(uint16_t hum_adc, const struct bme680_dev *dev) +{ + int32_t var1; + int32_t var2; + int32_t var3; + int32_t var4; + int32_t var5; + int32_t var6; + int32_t temp_scaled; + int32_t calc_hum; + + temp_scaled = (((int32_t) dev->calib.t_fine * 5) + 128) / 256; + var1 = (int32_t) (hum_adc - ((int32_t) ((int32_t) dev->calib.par_h1 * 16))) + - (((temp_scaled * (int32_t) dev->calib.par_h3) / ((int32_t) 100)) / 2); + var2 = ((int32_t) dev->calib.par_h2 + * (((temp_scaled * (int32_t) dev->calib.par_h4) / ((int32_t) 100)) + + (((temp_scaled * ((temp_scaled * (int32_t) dev->calib.par_h5) / ((int32_t) 100))) / 64) + / ((int32_t) 100)) + (int32_t) (1 * 16384))) / 1024; + var3 = var1 * var2; + var4 = (int32_t) dev->calib.par_h6 * 128; + var4 = ((var4) + ((temp_scaled * (int32_t) dev->calib.par_h7) / ((int32_t) 100))) / 16; + var5 = ((var3 / 16384) * (var3 / 16384)) / 1024; + var6 = (var4 * var5) / 2; + calc_hum = (((var3 + var6) / 1024) * ((int32_t) 1000)) / 4096; + + if (calc_hum > 100000) /* Cap at 100%rH */ + calc_hum = 100000; + else if (calc_hum < 0) + calc_hum = 0; + + return (uint32_t) calc_hum; +} + +/*! + * @brief This internal API is used to calculate the Gas Resistance value. + */ +static uint32_t calc_gas_resistance(uint16_t gas_res_adc, uint8_t gas_range, const struct bme680_dev *dev) +{ + int64_t var1; + uint64_t var2; + int64_t var3; + uint32_t calc_gas_res; + + var1 = (int64_t) ((1340 + (5 * (int64_t) dev->calib.range_sw_err)) * ((int64_t) lookupTable1[gas_range])) / 65536; + var2 = (((int64_t) ((int64_t) gas_res_adc * 32768) - (int64_t) (16777216)) + var1); + var3 = (((int64_t) lookupTable2[gas_range] * (int64_t) var1) / 512); + calc_gas_res = (uint32_t) ((var3 + ((int64_t) var2 / 2)) / (int64_t) var2); + + return calc_gas_res; +} + +/*! + * @brief This internal API is used to calculate the Heat Resistance value. + */ +static uint8_t calc_heater_res(uint16_t temp, const struct bme680_dev *dev) +{ + uint8_t heatr_res; + int32_t var1; + int32_t var2; + int32_t var3; + int32_t var4; + int32_t var5; + int32_t heatr_res_x100; + + if (temp < 200) /* Cap temperature */ + temp = 200; + else if (temp > 400) + temp = 400; + + var1 = (((int32_t) dev->amb_temp * dev->calib.par_gh3) / 1000) * 256; + var2 = (dev->calib.par_gh1 + 784) * (((((dev->calib.par_gh2 + 154009) * temp * 5) / 100) + 3276800) / 10); + var3 = var1 + (var2 / 2); + var4 = (var3 / (dev->calib.res_heat_range + 4)); + var5 = (131 * dev->calib.res_heat_val) + 65536; + heatr_res_x100 = (int32_t) (((var4 / var5) - 250) * 34); + heatr_res = (uint8_t) ((heatr_res_x100 + 50) / 100); + + return heatr_res; +} + +/*! + * @brief This internal API is used to calculate the Heat duration value. + */ +static uint8_t calc_heater_dur(uint16_t dur) +{ + uint8_t factor = 0; + uint8_t durval; + + if (dur >= 0xfc0) { + durval = 0xff; /* Max duration*/ + } else { + while (dur > 0x3F) { + dur = dur / 4; + factor += 1; + } + durval = (uint8_t) (dur + (factor * 64)); + } + + return durval; +} + +/*! + * @brief This internal API is used to calculate the field data of sensor. + */ +static int8_t read_field_data(struct bme680_field_data *data, struct bme680_dev *dev) +{ + int8_t rslt; + uint8_t buff[BME680_FIELD_LENGTH] = { 0 }; + uint8_t gas_range; + uint32_t adc_temp; + uint32_t adc_pres; + uint16_t adc_hum; + uint16_t adc_gas_res; + uint8_t tries = 10; + + /* Check for null pointer in the device structure*/ + rslt = null_ptr_check(dev); + do { + if (rslt == BME680_OK) { + rslt = bme680_get_regs(((uint8_t) (BME680_FIELD0_ADDR)), buff, (uint16_t) BME680_FIELD_LENGTH, dev); + + data->status = buff[0] & BME680_NEW_DATA_MSK; + data->gas_index = buff[0] & BME680_GAS_INDEX_MSK; + data->meas_index = buff[1]; + + /* read the raw data from the sensor */ + adc_pres = (uint32_t) (((uint32_t) buff[2] * 4096) | ((uint32_t) buff[3] * 16) | ((uint32_t) buff[4] / 16)); + adc_temp = (uint32_t) (((uint32_t) buff[5] * 4096) | ((uint32_t) buff[6] * 16) | ((uint32_t) buff[7] / 16)); + adc_hum = (uint16_t) (((uint32_t) buff[8] * 256) | (uint32_t) buff[9]); + adc_gas_res = (uint16_t) ((uint32_t) buff[13] * 4 | (((uint32_t) buff[14]) / 64)); + gas_range = buff[14] & BME680_GAS_RANGE_MSK; + + data->status |= buff[14] & BME680_GASM_VALID_MSK; + data->status |= buff[14] & BME680_HEAT_STAB_MSK; + + if (data->status & BME680_NEW_DATA_MSK) { + data->temperature = calc_temperature(adc_temp, dev); + data->pressure = calc_pressure(adc_pres, dev); + data->humidity = calc_humidity(adc_hum, dev); + data->gas_resistance = calc_gas_resistance(adc_gas_res, gas_range, dev); + break; + } else { + dev->delay_ms(BME680_POLL_PERIOD_MS); + } + } + tries--; + } while (tries); + + if (!tries) + rslt = BME680_W_NO_NEW_DATA; + + return rslt; +} + +/*! + * @brief This internal API is used to set the memory page based on register address. + */ +static int8_t set_mem_page(uint8_t reg_addr, struct bme680_dev *dev) +{ + int8_t rslt; + uint8_t reg; + uint8_t mem_page; + + /* Check for null pointers in the device structure*/ + rslt = null_ptr_check(dev); + if (rslt == BME680_OK) { + if (reg_addr > 0x7f) + mem_page = BME680_MEM_PAGE1; + else + mem_page = BME680_MEM_PAGE0; + + if (mem_page != dev->mem_page) { + dev->mem_page = mem_page; + + dev->com_rslt = dev->read(dev->dev_id, BME680_MEM_PAGE_ADDR | BME680_SPI_RD_MSK, ®, 1); + if (dev->com_rslt != 0) + rslt = BME680_E_COM_FAIL; + + if (rslt == BME680_OK) { + reg = reg & (~BME680_MEM_PAGE_MSK); + reg = reg | (dev->mem_page & BME680_MEM_PAGE_MSK); + + dev->com_rslt = dev->write(dev->dev_id, BME680_MEM_PAGE_ADDR & BME680_SPI_WR_MSK, ®, 1); + if (dev->com_rslt != 0) + rslt = BME680_E_COM_FAIL; + } + } + } + + return rslt; +} + +/*! + * @brief This internal API is used to get the memory page based on register address. + */ +static int8_t get_mem_page(struct bme680_dev *dev) +{ + int8_t rslt; + uint8_t reg; + + /* Check for null pointer in the device structure*/ + rslt = null_ptr_check(dev); + if (rslt == BME680_OK) { + dev->com_rslt = dev->read(dev->dev_id, BME680_MEM_PAGE_ADDR | BME680_SPI_RD_MSK, ®, 1); + if (dev->com_rslt != 0) + rslt = BME680_E_COM_FAIL; + else + dev->mem_page = reg & BME680_MEM_PAGE_MSK; + } + + return rslt; +} + +/*! + * @brief This internal API is used to validate the boundary + * conditions. + */ +static int8_t boundary_check(uint8_t *value, uint8_t min, uint8_t max, struct bme680_dev *dev) +{ + int8_t rslt = BME680_OK; + + if (value != NULL) { + /* Check if value is below minimum value */ + if (*value < min) { + /* Auto correct the invalid value to minimum value */ + *value = min; + dev->info_msg |= BME680_I_MIN_CORRECTION; + } + /* Check if value is above maximum value */ + if (*value > max) { + /* Auto correct the invalid value to maximum value */ + *value = max; + dev->info_msg |= BME680_I_MAX_CORRECTION; + } + } else { + rslt = BME680_E_NULL_PTR; + } + + return rslt; +} + +/*! + * @brief This internal API is used to validate the device structure pointer for + * null conditions. + */ +static int8_t null_ptr_check(const struct bme680_dev *dev) +{ + int8_t rslt; + + if ((dev == NULL) || (dev->read == NULL) || (dev->write == NULL) || (dev->delay_ms == NULL)) { + /* Device structure pointer is not valid */ + rslt = BME680_E_NULL_PTR; + } else { + /* Device structure is fine */ + rslt = BME680_OK; + } + + return rslt; +} diff --git a/BME680_driver/bme680.h b/BME680_driver/bme680.h new file mode 100644 index 0000000..191a154 --- /dev/null +++ b/BME680_driver/bme680.h @@ -0,0 +1,228 @@ +/** + * Copyright (C) 2017 - 2018 Bosch Sensortec GmbH + * + * 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.h + * @date 5 Jul 2017 + * @version 3.5.1 + * @brief + * + */ +/*! @file bme680.h + @brief Sensor driver for BME680 sensor */ +/*! + * @defgroup BME680 SENSOR API + * @{*/ +#ifndef BME680_H_ +#define BME680_H_ + +/*! CPP guard */ +#ifdef __cplusplus +extern "C" +{ +#endif + +/* Header includes */ +#include "bme680_defs.h" + +int16_t calc_temperature(uint32_t temp_adc, struct bme680_dev *dev); +uint32_t calc_pressure(uint32_t pres_adc, const struct bme680_dev *dev); + +/* function prototype declarations */ +/*! + * @brief This API is the entry point. + * It reads the chip-id and calibration data from the sensor. + * + * @param[in,out] dev : Structure instance of bme680_dev + * + * @return Result of API execution status + * @retval zero -> Success / +ve value -> Warning / -ve value -> Error + */ +int8_t bme680_init(struct bme680_dev *dev); + +/*! + * @brief This API writes the given data to the register address + * of the sensor. + * + * @param[in] reg_addr : Register address from where the data to be written. + * @param[in] reg_data : Pointer to data buffer which is to be written + * in the sensor. + * @param[in] len : No of bytes of data to write.. + * @param[in] dev : Structure instance of bme680_dev. + * + * @return Result of API execution status + * @retval zero -> Success / +ve value -> Warning / -ve value -> Error + */ +int8_t bme680_set_regs(const uint8_t *reg_addr, const uint8_t *reg_data, uint8_t len, struct bme680_dev *dev); + +/*! + * @brief This API reads the data from the given register address of the sensor. + * + * @param[in] reg_addr : Register address from where the data to be read + * @param[out] reg_data : Pointer to data buffer to store the read data. + * @param[in] len : No of bytes of data to be read. + * @param[in] dev : Structure instance of bme680_dev. + * + * @return Result of API execution status + * @retval zero -> Success / +ve value -> Warning / -ve value -> Error + */ +int8_t bme680_get_regs(uint8_t reg_addr, uint8_t *reg_data, uint16_t len, struct bme680_dev *dev); + +/*! + * @brief This API performs the soft reset of the sensor. + * + * @param[in] dev : Structure instance of bme680_dev. + * + * @return Result of API execution status + * @retval zero -> Success / +ve value -> Warning / -ve value -> Error. + */ +int8_t bme680_soft_reset(struct bme680_dev *dev); + +/*! + * @brief This API is used to set the power mode of the sensor. + * + * @param[in] dev : Structure instance of bme680_dev + * @note : Pass the value to bme680_dev.power_mode structure variable. + * + * value | mode + * -------------|------------------ + * 0x00 | BME680_SLEEP_MODE + * 0x01 | BME680_FORCED_MODE + * + * * @return Result of API execution status + * @retval zero -> Success / +ve value -> Warning / -ve value -> Error + */ +int8_t bme680_set_sensor_mode(struct bme680_dev *dev); + +/*! + * @brief This API is used to get the power mode of the sensor. + * + * @param[in] dev : Structure instance of bme680_dev + * @note : bme680_dev.power_mode structure variable hold the power mode. + * + * value | mode + * ---------|------------------ + * 0x00 | BME680_SLEEP_MODE + * 0x01 | BME680_FORCED_MODE + * + * @return Result of API execution status + * @retval zero -> Success / +ve value -> Warning / -ve value -> Error + */ +int8_t bme680_get_sensor_mode(struct bme680_dev *dev); + +/*! + * @brief This API is used to set the profile duration of the sensor. + * + * @param[in] dev : Structure instance of bme680_dev. + * @param[in] duration : Duration of the measurement in ms. + * + * @return Nothing + */ +void bme680_set_profile_dur(uint16_t duration, struct bme680_dev *dev); + +/*! + * @brief This API is used to get the profile duration of the sensor. + * + * @param[in] dev : Structure instance of bme680_dev. + * @param[in] duration : Duration of the measurement in ms. + * + * @return Nothing + */ +void bme680_get_profile_dur(uint16_t *duration, struct bme680_dev *dev); + +/*! + * @brief This API reads the pressure, temperature and humidity and gas data + * from the sensor, compensates the data and store it in the bme680_data + * structure instance passed by the user. + * + * @param[out] data: Structure instance to hold the data. + * @param[in] dev : Structure instance of bme680_dev. + * + * @return Result of API execution status + * @retval zero -> Success / +ve value -> Warning / -ve value -> Error + */ +int8_t bme680_get_sensor_data(struct bme680_field_data *data, struct bme680_dev *dev); + +/*! + * @brief This API is used to set the oversampling, filter and T,P,H, gas selection + * settings in the sensor. + * + * @param[in] dev : Structure instance of bme680_dev. + * @param[in] desired_settings : Variable used to select the settings which + * are to be set in the sensor. + * + * Macros | Functionality + *-------------------------|---------------------------------------------- + * BME680_OST_SEL | To set temperature oversampling. + * BME680_OSP_SEL | To set pressure oversampling. + * BME680_OSH_SEL | To set humidity oversampling. + * BME680_GAS_MEAS_SEL | To set gas measurement setting. + * BME680_FILTER_SEL | To set filter setting. + * BME680_HCNTRL_SEL | To set humidity control setting. + * BME680_RUN_GAS_SEL | To set run gas setting. + * BME680_NBCONV_SEL | To set NB conversion setting. + * BME680_GAS_SENSOR_SEL | To set all gas sensor related settings + * + * @note : Below are the macros to be used by the user for selecting the + * desired settings. User can do OR operation of these macros for configuring + * multiple settings. + * + * @return Result of API execution status + * @retval zero -> Success / +ve value -> Warning / -ve value -> Error. + */ +int8_t bme680_set_sensor_settings(uint16_t desired_settings, struct bme680_dev *dev); + +/*! + * @brief This API is used to get the oversampling, filter and T,P,H, gas selection + * settings in the sensor. + * + * @param[in] dev : Structure instance of bme680_dev. + * @param[in] desired_settings : Variable used to select the settings which + * are to be get from the sensor. + * + * @return Result of API execution status + * @retval zero -> Success / +ve value -> Warning / -ve value -> Error. + */ +int8_t bme680_get_sensor_settings(uint16_t desired_settings, struct bme680_dev *dev); +#ifdef __cplusplus +} +#endif /* End of CPP guard */ +#endif /* BME680_H_ */ +/** @}*/ diff --git a/BME680_driver/bme680_defs.h b/BME680_driver/bme680_defs.h new file mode 100644 index 0000000..4ef701f --- /dev/null +++ b/BME680_driver/bme680_defs.h @@ -0,0 +1,529 @@ +/** + * Copyright (C) 2017 - 2018 Bosch Sensortec GmbH + * + * 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_defs.h + * @date 5 Jul 2017 + * @version 3.5.1 + * @brief + * + */ + +/*! @file bme680_defs.h + @brief Sensor driver for BME680 sensor */ +/*! + * @defgroup BME680 SENSOR API + * @brief + * @{*/ +#ifndef BME680_DEFS_H_ +#define BME680_DEFS_H_ + +/********************************************************/ +/* header includes */ +#ifdef __KERNEL__ +#include +#else +#include +#endif + +#ifdef __KERNEL__ +#if (LONG_MAX) > 0x7fffffff +#define __have_long64 1 +#elif (LONG_MAX) == 0x7fffffff +#define __have_long32 1 +#endif + +#if !defined(UINT8_C) +#define INT8_C(x) x +#if (INT_MAX) > 0x7f +#define UINT8_C(x) x +#else +#define UINT8_C(x) x##U +#endif +#endif + +#if !defined(UINT16_C) +#define INT16_C(x) x +#if (INT_MAX) > 0x7fff +#define UINT16_C(x) x +#else +#define UINT16_C(x) x##U +#endif +#endif + +#if !defined(INT32_C) && !defined(UINT32_C) +#if __have_long32 +#define INT32_C(x) x##L +#define UINT32_C(x) x##UL +#else +#define INT32_C(x) x +#define UINT32_C(x) x##U +#endif +#endif + +#if !defined(INT64_C) && !defined(UINT64_C) +#if __have_long64 +#define INT64_C(x) x##L +#define UINT64_C(x) x##UL +#else +#define INT64_C(x) x##LL +#define UINT64_C(x) x##ULL +#endif +#endif +#endif +/**@}*/ + +/**\name C standard macros */ +#ifndef NULL +#ifdef __cplusplus +#define NULL 0 +#else +#define NULL ((void *) 0) +#endif +#endif + +/** BME680 General config */ +#define BME680_POLL_PERIOD_MS UINT8_C(10) + +/** BME680 I2C addresses */ +#define BME680_I2C_ADDR_PRIMARY UINT8_C(0x76) +#define BME680_I2C_ADDR_SECONDARY UINT8_C(0x77) + +/** BME680 unique chip identifier */ +#define BME680_CHIP_ID UINT8_C(0x61) + +/** BME680 coefficients related defines */ +#define BME680_COEFF_SIZE UINT8_C(0x41) +#define BME680_COEFF_ADDR1_LEN UINT8_C(25) +#define BME680_COEFF_ADDR2_LEN UINT8_C(16) + +/** BME680 field_x related defines */ +#define BME680_FIELD_LENGTH UINT8_C(15) +#define BME680_FIELD_ADDR_OFFSET UINT8_C(17) + +/** Soft reset command */ +#define BME680_SOFT_RESET_CMD UINT8_C(0xb6) + +/** Error code definitions */ +#define BME680_OK INT8_C(0) +/* Errors */ +#define BME680_E_NULL_PTR INT8_C(-1) +#define BME680_E_COM_FAIL INT8_C(-2) +#define BME680_E_DEV_NOT_FOUND INT8_C(-3) +#define BME680_E_INVALID_LENGTH INT8_C(-4) + +/* Warnings */ +#define BME680_W_DEFINE_PWR_MODE INT8_C(1) +#define BME680_W_NO_NEW_DATA INT8_C(2) + +/* Info's */ +#define BME680_I_MIN_CORRECTION UINT8_C(1) +#define BME680_I_MAX_CORRECTION UINT8_C(2) + +/** Register map */ +/** Other coefficient's address */ +#define BME680_ADDR_RES_HEAT_VAL_ADDR UINT8_C(0x00) +#define BME680_ADDR_RES_HEAT_RANGE_ADDR UINT8_C(0x02) +#define BME680_ADDR_RANGE_SW_ERR_ADDR UINT8_C(0x04) +#define BME680_ADDR_SENS_CONF_START UINT8_C(0x5A) +#define BME680_ADDR_GAS_CONF_START UINT8_C(0x64) + +/** Field settings */ +#define BME680_FIELD0_ADDR UINT8_C(0x1d) + +/** Heater settings */ +#define BME680_RES_HEAT0_ADDR UINT8_C(0x5a) +#define BME680_GAS_WAIT0_ADDR UINT8_C(0x64) + +/** Sensor configuration registers */ +#define BME680_CONF_HEAT_CTRL_ADDR UINT8_C(0x70) +#define BME680_CONF_ODR_RUN_GAS_NBC_ADDR UINT8_C(0x71) +#define BME680_CONF_OS_H_ADDR UINT8_C(0x72) +#define BME680_MEM_PAGE_ADDR UINT8_C(0xf3) +#define BME680_CONF_T_P_MODE_ADDR UINT8_C(0x74) +#define BME680_CONF_ODR_FILT_ADDR UINT8_C(0x75) + +/** Coefficient's address */ +#define BME680_COEFF_ADDR1 UINT8_C(0x89) +#define BME680_COEFF_ADDR2 UINT8_C(0xe1) + +/** Chip identifier */ +#define BME680_CHIP_ID_ADDR UINT8_C(0xd0) + +/** Soft reset register */ +#define BME680_SOFT_RESET_ADDR UINT8_C(0xe0) + +/** Heater control settings */ +#define BME680_ENABLE_HEATER UINT8_C(0x00) +#define BME680_DISABLE_HEATER UINT8_C(0x08) + +/** Gas measurement settings */ +#define BME680_DISABLE_GAS_MEAS UINT8_C(0x00) +#define BME680_ENABLE_GAS_MEAS UINT8_C(0x01) + +/** Over-sampling settings */ +#define BME680_OS_NONE UINT8_C(0) +#define BME680_OS_1X UINT8_C(1) +#define BME680_OS_2X UINT8_C(2) +#define BME680_OS_4X UINT8_C(3) +#define BME680_OS_8X UINT8_C(4) +#define BME680_OS_16X UINT8_C(5) + +/** IIR filter settings */ +#define BME680_FILTER_SIZE_0 UINT8_C(0) +#define BME680_FILTER_SIZE_1 UINT8_C(1) +#define BME680_FILTER_SIZE_3 UINT8_C(2) +#define BME680_FILTER_SIZE_7 UINT8_C(3) +#define BME680_FILTER_SIZE_15 UINT8_C(4) +#define BME680_FILTER_SIZE_31 UINT8_C(5) +#define BME680_FILTER_SIZE_63 UINT8_C(6) +#define BME680_FILTER_SIZE_127 UINT8_C(7) + +/** Power mode settings */ +#define BME680_SLEEP_MODE UINT8_C(0) +#define BME680_FORCED_MODE UINT8_C(1) + +/** Delay related macro declaration */ +#define BME680_RESET_PERIOD UINT32_C(10) + +/** SPI memory page settings */ +#define BME680_MEM_PAGE0 UINT8_C(0x10) +#define BME680_MEM_PAGE1 UINT8_C(0x00) + +/** Ambient humidity shift value for compensation */ +#define BME680_HUM_REG_SHIFT_VAL UINT8_C(4) + +/** Run gas enable and disable settings */ +#define BME680_RUN_GAS_DISABLE UINT8_C(0) +#define BME680_RUN_GAS_ENABLE UINT8_C(1) + +/** Buffer length macro declaration */ +#define BME680_TMP_BUFFER_LENGTH UINT8_C(40) +#define BME680_REG_BUFFER_LENGTH UINT8_C(6) +#define BME680_FIELD_DATA_LENGTH UINT8_C(3) +#define BME680_GAS_REG_BUF_LENGTH UINT8_C(20) +#define BME680_GAS_HEATER_PROF_LEN_MAX UINT8_C(10) + +/** Settings selector */ +#define BME680_OST_SEL UINT16_C(1) +#define BME680_OSP_SEL UINT16_C(2) +#define BME680_OSH_SEL UINT16_C(4) +#define BME680_GAS_MEAS_SEL UINT16_C(8) +#define BME680_FILTER_SEL UINT16_C(16) +#define BME680_HCNTRL_SEL UINT16_C(32) +#define BME680_RUN_GAS_SEL UINT16_C(64) +#define BME680_NBCONV_SEL UINT16_C(128) +#define BME680_GAS_SENSOR_SEL UINT16_C(BME680_GAS_MEAS_SEL | BME680_RUN_GAS_SEL | BME680_NBCONV_SEL) + +/** Number of conversion settings*/ +#define BME680_NBCONV_MIN UINT8_C(0) +#define BME680_NBCONV_MAX UINT8_C(10) + +/** Mask definitions */ +#define BME680_GAS_MEAS_MSK UINT8_C(0x30) +#define BME680_NBCONV_MSK UINT8_C(0X0F) +#define BME680_FILTER_MSK UINT8_C(0X1C) +#define BME680_OST_MSK UINT8_C(0XE0) +#define BME680_OSP_MSK UINT8_C(0X1C) +#define BME680_OSH_MSK UINT8_C(0X07) +#define BME680_HCTRL_MSK UINT8_C(0x08) +#define BME680_RUN_GAS_MSK UINT8_C(0x10) +#define BME680_MODE_MSK UINT8_C(0x03) +#define BME680_RHRANGE_MSK UINT8_C(0x30) +#define BME680_RSERROR_MSK UINT8_C(0xf0) +#define BME680_NEW_DATA_MSK UINT8_C(0x80) +#define BME680_GAS_INDEX_MSK UINT8_C(0x0f) +#define BME680_GAS_RANGE_MSK UINT8_C(0x0f) +#define BME680_GASM_VALID_MSK UINT8_C(0x20) +#define BME680_HEAT_STAB_MSK UINT8_C(0x10) +#define BME680_MEM_PAGE_MSK UINT8_C(0x10) +#define BME680_SPI_RD_MSK UINT8_C(0x80) +#define BME680_SPI_WR_MSK UINT8_C(0x7f) +#define BME680_BIT_H1_DATA_MSK UINT8_C(0x0F) + +/** Bit position definitions for sensor settings */ +#define BME680_GAS_MEAS_POS UINT8_C(4) +#define BME680_FILTER_POS UINT8_C(2) +#define BME680_OST_POS UINT8_C(5) +#define BME680_OSP_POS UINT8_C(2) +#define BME680_RUN_GAS_POS UINT8_C(4) + +/** Array Index to Field data mapping for Calibration Data*/ +#define BME680_T2_LSB_REG (1) +#define BME680_T2_MSB_REG (2) +#define BME680_T3_REG (3) +#define BME680_P1_LSB_REG (5) +#define BME680_P1_MSB_REG (6) +#define BME680_P2_LSB_REG (7) +#define BME680_P2_MSB_REG (8) +#define BME680_P3_REG (9) +#define BME680_P4_LSB_REG (11) +#define BME680_P4_MSB_REG (12) +#define BME680_P5_LSB_REG (13) +#define BME680_P5_MSB_REG (14) +#define BME680_P7_REG (15) +#define BME680_P6_REG (16) +#define BME680_P8_LSB_REG (19) +#define BME680_P8_MSB_REG (20) +#define BME680_P9_LSB_REG (21) +#define BME680_P9_MSB_REG (22) +#define BME680_P10_REG (23) +#define BME680_H2_MSB_REG (25) +#define BME680_H2_LSB_REG (26) +#define BME680_H1_LSB_REG (26) +#define BME680_H1_MSB_REG (27) +#define BME680_H3_REG (28) +#define BME680_H4_REG (29) +#define BME680_H5_REG (30) +#define BME680_H6_REG (31) +#define BME680_H7_REG (32) +#define BME680_T1_LSB_REG (33) +#define BME680_T1_MSB_REG (34) +#define BME680_GH2_LSB_REG (35) +#define BME680_GH2_MSB_REG (36) +#define BME680_GH1_REG (37) +#define BME680_GH3_REG (38) + +/** BME680 register buffer index settings*/ +#define BME680_REG_FILTER_INDEX UINT8_C(5) +#define BME680_REG_TEMP_INDEX UINT8_C(4) +#define BME680_REG_PRES_INDEX UINT8_C(4) +#define BME680_REG_HUM_INDEX UINT8_C(2) +#define BME680_REG_NBCONV_INDEX UINT8_C(1) +#define BME680_REG_RUN_GAS_INDEX UINT8_C(1) +#define BME680_REG_HCTRL_INDEX UINT8_C(0) + +/** Macro to combine two 8 bit data's to form a 16 bit data */ +#define BME680_CONCAT_BYTES(msb, lsb) (((uint16_t)msb << 8) | (uint16_t)lsb) + +/** Macro to SET and GET BITS of a register */ +#define BME680_SET_BITS(reg_data, bitname, data) \ + ((reg_data & ~(bitname##_MSK)) | \ + ((data << bitname##_POS) & bitname##_MSK)) +#define BME680_GET_BITS(reg_data, bitname) ((reg_data & (bitname##_MSK)) >> \ + (bitname##_POS)) + +/** Macro variant to handle the bitname position if it is zero */ +#define BME680_SET_BITS_POS_0(reg_data, bitname, data) \ + ((reg_data & ~(bitname##_MSK)) | \ + (data & bitname##_MSK)) +#define BME680_GET_BITS_POS_0(reg_data, bitname) (reg_data & (bitname##_MSK)) + +/** Type definitions */ +/* + * Generic communication function pointer + * @param[in] dev_id: Place holder to store the id of the device structure + * Can be used to store the index of the Chip select or + * I2C address of the device. + * @param[in] reg_addr: Used to select the register the where data needs to + * be read from or written to. + * @param[in/out] reg_data: Data array to read/write + * @param[in] len: Length of the data array + */ +typedef int8_t (*bme680_com_fptr_t)(uint8_t dev_id, uint8_t reg_addr, uint8_t *data, uint16_t len); + +/* + * Delay function pointer + * @param[in] period: Time period in milliseconds + */ +typedef void (*bme680_delay_fptr_t)(uint32_t period); + +/*! + * @brief Interface selection Enumerations + */ +enum bme680_intf { + /*! SPI interface */ + BME680_SPI_INTF, + /*! I2C interface */ + BME680_I2C_INTF +}; + +/* structure definitions */ +/*! + * @brief Sensor field data structure + */ +struct bme680_field_data { + /*! Contains new_data, gasm_valid & heat_stab */ + uint8_t status; + /*! The index of the heater profile used */ + uint8_t gas_index; + /*! Measurement index to track order */ + uint8_t meas_index; + /*! Temperature in degree celsius x100 */ + int16_t temperature; + /*! Pressure in Pascal */ + uint32_t pressure; + /*! Humidity in % relative humidity x1000 */ + uint32_t humidity; + /*! Gas resistance in Ohms */ + uint32_t gas_resistance; +}; + +/*! + * @brief Structure to hold the Calibration data + */ +struct bme680_calib_data { + /*! Variable to store calibrated humidity data */ + uint16_t par_h1; + /*! Variable to store calibrated humidity data */ + uint16_t par_h2; + /*! Variable to store calibrated humidity data */ + int8_t par_h3; + /*! Variable to store calibrated humidity data */ + int8_t par_h4; + /*! Variable to store calibrated humidity data */ + int8_t par_h5; + /*! Variable to store calibrated humidity data */ + uint8_t par_h6; + /*! Variable to store calibrated humidity data */ + int8_t par_h7; + /*! Variable to store calibrated gas data */ + int8_t par_gh1; + /*! Variable to store calibrated gas data */ + int16_t par_gh2; + /*! Variable to store calibrated gas data */ + int8_t par_gh3; + /*! Variable to store calibrated temperature data */ + uint16_t par_t1; + /*! Variable to store calibrated temperature data */ + int16_t par_t2; + /*! Variable to store calibrated temperature data */ + int8_t par_t3; + /*! Variable to store calibrated pressure data */ + uint16_t par_p1; + /*! Variable to store calibrated pressure data */ + int16_t par_p2; + /*! Variable to store calibrated pressure data */ + int8_t par_p3; + /*! Variable to store calibrated pressure data */ + int16_t par_p4; + /*! Variable to store calibrated pressure data */ + int16_t par_p5; + /*! Variable to store calibrated pressure data */ + int8_t par_p6; + /*! Variable to store calibrated pressure data */ + int8_t par_p7; + /*! Variable to store calibrated pressure data */ + int16_t par_p8; + /*! Variable to store calibrated pressure data */ + int16_t par_p9; + /*! Variable to store calibrated pressure data */ + uint8_t par_p10; + /*! Variable to store t_fine size */ + int32_t t_fine; + /*! Variable to store heater resistance range */ + uint8_t res_heat_range; + /*! Variable to store heater resistance value */ + int8_t res_heat_val; + /*! Variable to store error range */ + int8_t range_sw_err; +}; + +/*! + * @brief BME680 sensor settings structure which comprises of ODR, + * over-sampling and filter settings. + */ +struct bme680_tph_sett { + /*! Humidity oversampling */ + uint8_t os_hum; + /*! Temperature oversampling */ + uint8_t os_temp; + /*! Pressure oversampling */ + uint8_t os_pres; + /*! Filter coefficient */ + uint8_t filter; +}; + +/*! + * @brief BME680 gas sensor which comprises of gas settings + * and status parameters + */ +struct bme680_gas_sett { + /*! Variable to store nb conversion */ + uint8_t nb_conv; + /*! Variable to store heater control */ + uint8_t heatr_ctrl; + /*! Run gas enable value */ + uint8_t run_gas; + /*! Pointer to store heater temperature */ + uint16_t heatr_temp; + /*! Pointer to store duration profile */ + uint16_t heatr_dur; +}; + +/*! + * @brief BME680 device structure + */ +struct bme680_dev { + /*! Chip Id */ + uint8_t chip_id; + /*! Device Id */ + uint8_t dev_id; + /*! SPI/I2C interface */ + enum bme680_intf intf; + /*! Memory page used */ + uint8_t mem_page; + /*! Ambient temperature in Degree C*/ + int8_t amb_temp; + /*! Sensor calibration data */ + struct bme680_calib_data calib; + /*! Sensor settings */ + struct bme680_tph_sett tph_sett; + /*! Gas Sensor settings */ + struct bme680_gas_sett gas_sett; + /*! Sensor power modes */ + uint8_t power_mode; + /*! New sensor fields */ + uint8_t new_fields; + /*! Store the info messages */ + uint8_t info_msg; + /*! Burst read structure */ + bme680_com_fptr_t read; + /*! Burst write structure */ + bme680_com_fptr_t write; + /*! Delay in ms */ + bme680_delay_fptr_t delay_ms; + /*! Communication function result */ + int8_t com_rslt; +}; + +#endif /* BME680_DEFS_H_ */ +/** @}*/ +/** @}*/ diff --git a/BME680_driver/changelog.md b/BME680_driver/changelog.md new file mode 100644 index 0000000..36bc4ab --- /dev/null +++ b/BME680_driver/changelog.md @@ -0,0 +1,42 @@ +# Change Log +All notable changes to the BME680 Sensor API will be documented in this file. + +## v3.5.1, 5 Jul 2017 +### Changed + - Fixed bug with overwriting of the result with communication results + - Added member in the dev structure to store communication results + - Updated set profile duration API to not return a result. + - Added new API to get the duration for the existing profile + - Fixed bug with setting gas configuration. Reduced to writing only relevant bytes + - Updated readme + - Updated documentation for the type definitions + - Removed mode check for get sensor data and setting and getting profile dur + + +## v3.5.0, 28 Jun 2017 +### Changed +- Fixed bug with getting and setting mem pages +- Changed initialization sequence to be more robust +- Added additional tries while reading data in case of inadequate delay + + +## v3.4.0, 8 Jun 2017 +### Changed +- Modified the bme680_get_sensor_data API. User has to now pass the struct that stores the data rather than retrieving from the bme680_dev structure. +- Fixed possible bugs + +## v3.3.0, 24 May 2017 +### Changed +- Name changes in the BME680 device structure. +- Removed sequential and parallel modes. +- Removed ODR related sensor settings +- Modified get sensor settings API with user selection. +- Removed sort sensor data and swap fields API which are not required. + +### Added +- BME680 set profile duration API. + +## v3.2.1, 17 May 2017 +### Added +- Took the reference as base version 3.2.1 of BME680 sensor and added. + diff --git a/BME680_driver/main.c b/BME680_driver/main.c new file mode 100644 index 0000000..4ec448f --- /dev/null +++ b/BME680_driver/main.c @@ -0,0 +1,69 @@ +#include "bme680.h" +#include +#include + +struct bme680_dev gas_sensor; + +uint8_t coeff1[25] = { + 192, 108, 103, 3, 47, 80, 144, 236, + 214, 88, 255, 42, 30, 169, 255, 54, + 30, 0, 0, 199, 239, 69, 248, 30, + 1 +}; +uint8_t coeff2[16] = { + 64, 206, 39, 0, 45, 20, 120, + 156, 24, 102, 142, 171, 226, 18, 16, + 0 +}; + +int8_t user_i2c_read(uint8_t dev_id, uint8_t reg_addr, uint8_t *data, uint16_t len){ + switch(reg_addr){ + case BME680_CHIP_ID_ADDR: + data[0] = BME680_CHIP_ID; + return BME680_OK; + + case BME680_COEFF_ADDR1: + memcpy(data, coeff1, len); + return BME680_OK; + + case BME680_COEFF_ADDR2: + memcpy(data, coeff2, len); + return BME680_OK; + } + return 0; +} + +int8_t user_i2c_write(uint8_t dev_id, uint8_t reg_addr, uint8_t *data, uint16_t len){ + return 0; +} + +void user_delay_ms(uint32_t period){ + return; +} + +int main(){ + gas_sensor.dev_id = BME680_I2C_ADDR_PRIMARY; + gas_sensor.intf = BME680_I2C_INTF; + gas_sensor.read = user_i2c_read; + gas_sensor.write = user_i2c_write; + gas_sensor.delay_ms = user_delay_ms; + + int8_t rslt = BME680_OK; + rslt = bme680_init(&gas_sensor); + if(rslt == BME680_OK){ + printf("CHIP OK\n"); + printf("%d\n",gas_sensor.calib.par_t1); + printf("%d\n",gas_sensor.calib.par_t2); + } + + uint8_t buff[15] = {128,0, 79,186,144, 122,185,64, 76,59, 128,0,0, 220,120}; + + uint32_t adc_pres = (uint32_t) (((uint32_t) buff[2] * 4096) | ((uint32_t) buff[3] * 16) | ((uint32_t) buff[4] / 16)); + uint32_t adc_temp = (uint32_t) (((uint32_t) buff[5] * 4096) | ((uint32_t) buff[6] * 16) | ((uint32_t) buff[7] / 16)); + uint16_t adc_hum = (uint16_t) (((uint32_t) buff[8] * 256) | (uint32_t) buff[9]); + uint16_t adc_gas_res = (uint16_t) ((uint32_t) buff[13] * 4 | (((uint32_t) buff[14]) / 64)); + uint8_t gas_range = buff[14] & BME680_GAS_RANGE_MSK; + + printf("%d\n",calc_temperature(adc_temp, &gas_sensor)); + printf("%d\n",calc_pressure(adc_pres, &gas_sensor)); +}