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Specifications mentioned in the Information are * subject to change without notice. * * It is not allowed to deliver the source code of the Software to any third party without permission of * Bosch Sensortec. * */ /*! * * @file bsec_interface.h * * @brief * Contains the API for BSEC * */ #ifndef __BSEC_INTERFACE_H__ #define __BSEC_INTERFACE_H__ #include "bsec_datatypes.h" #ifdef __cplusplus extern "C" { #endif /*! @addtogroup bsec_interface BSEC C Interface * @brief Interfaces of BSEC signal processing library * * ### Interface usage * * The following provides a short overview on the typical operation sequence for BSEC. * * - Initialization of the library * * | Steps | Function | * |---------------------------------------------------------------------|--------------------------| * | Initialization of library | bsec_init() | * | Update configuration settings (optional) | bsec_set_configuration() | * | Restore the state of the library (optional) | bsec_set_state() | * * * - The following function is called to enable output signals and define their sampling rate / operation mode. * * | Steps | Function | * |---------------------------------------------|----------------------------| * | Enable library outputs with specified mode | bsec_update_subscription() | * * * - This table describes the main processing loop. * * | Steps | Function | * |-------------------------------------------|----------------------------------| * | Retrieve sensor settings to be used | bsec_sensor_control() | * | Configure sensor and trigger measurement | See BME680 API and example codes | * | Read results from sensor | See BME680 API and example codes | * | Perform signal processing | bsec_do_steps() | * * * - Before shutting down the system, the current state of BSEC can be retrieved and can then be used during * re-initalization to continue processing. * * | Steps | Function | * |----------------------------------------|-------------------| * | To retrieve the current library state | bsec_get_state() | * * * * ### Configuration and state * * Values of variables belonging to a BSEC instance are divided into two groups: * - Values **not updated by processing** of signals belong to the **configuration group**. If available, BSEC can be * configured before use with a customer specific configuration string. * - Values **updated during processing** are member of the **state group**. Saving and restoring of the state of BSEC * is necessary to maintain previously estimated sensor models and baseline information which is important for best * performance of the gas sensor outputs. * * @note BSEC library consists of adaptive algorithms which models the gas sensor which improves its performance over * the time. These will be lost if library is initialised due to system reset. In order to avoid this situation * library state shall be stored in non volatile memory so that it can be loaded after system reset. * * * @{ */ /*! * @brief Return the version information of BSEC library * * @param [out] bsec_version_p pointer to struct which is to be populated with the version information * * @return Zero if successful, otherwise an error code * * See also: bsec_version_t * \code{.c} // Example // bsec_version_t version; bsec_get_version(&version); printf("BSEC version: %d.%d.%d.%d",version.major, version.minor, version.major_bugfix, version.minor_bugfix); \endcode */ bsec_library_return_t bsec_get_version(bsec_version_t * bsec_version_p); /*! * @brief Initialize the library * * Initialization and reset of BSEC is performed by calling bsec_init(). Calling this function sets up the relation * among all internal modules, initializes run-time dependent library states and resets the configuration and state * of all BSEC signal processing modules to defaults. * * Before any further use, the library must be initialized. This ensure that all memory and states are in defined * conditions prior to processing any data. * * @return Zero if successful, otherwise an error code * \code{.c} // Initialize BSEC library before further use bsec_init(); \endcode */ bsec_library_return_t bsec_init(void); /*! * @brief Subscribe to library virtual sensors outputs * * Use bsec_update_subscription() to instruct BSEC which of the processed output signals are requested at which sample rates. * See ::bsec_virtual_sensor_t for available library outputs. * * Based on the requested virtual sensors outputs, BSEC will provide information about the required physical sensor input signals * (see ::bsec_physical_sensor_t) with corresponding sample rates. This information is purely informational as bsec_sensor_control() * will ensure the sensor is operated in the required manner. To disable a virtual sensor, set the sample rate to BSEC_SAMPLE_RATE_DISABLED. * * The subscription update using bsec_update_subscription() is apart from the signal processing one of the the most * important functions. It allows to enable the desired library outputs. The function determines which physical input * sensor signals are required at which sample rate to produce the virtual output sensor signals requested by the user. * When this function returns with success, the requested outputs are called subscribed. A very important feature is the * retaining of already subscribed outputs. Further outputs can be requested or disabled both individually and * group-wise in addition to already subscribed outputs without changing them unless a change of already subscribed * outputs is requested. * * @note The state of the library concerning the subscribed outputs cannot be retained among reboots. * * The interface of bsec_update_subscription() requires the usage of arrays of sensor configuration structures. * Such a structure has the fields sensor identifier and sample rate. These fields have the properties: * - Output signals of virtual sensors must be requested using unique identifiers (Member of ::bsec_virtual_sensor_t) * - Different sets of identifiers are available for inputs of physical sensors and outputs of virtual sensors * - Identifiers are unique values defined by the library, not from external * - Sample rates must be provided as value of * - An allowed sample rate for continuously sampled signals * - 65535.0f (BSEC_SAMPLE_RATE_DISABLED) to turn off outputs and identify disabled inputs * * @note The same sensor identifiers are also used within the functions bsec_do_steps(). * * The usage principles of bsec_update_subscription() are: * - Differential updates (i.e., only asking for outputs that the user would like to change) is supported. * - Invalid requests of outputs are ignored. Also if one of the requested outputs is unavailable, all the requests * are ignored. At the same time, a warning is returned. * - To disable BSEC, all outputs shall be turned off. Only enabled (subscribed) outputs have to be disabled while * already disabled outputs do not have to be disabled explicitly. * * @param[in] requested_virtual_sensors Pointer to array of requested virtual sensor (output) configurations for the library * @param[in] n_requested_virtual_sensors Number of virtual sensor structs pointed by requested_virtual_sensors * @param[out] required_sensor_settings Pointer to array of required physical sensor configurations for the library * @param[in,out] n_required_sensor_settings [in] Size of allocated required_sensor_settings array, [out] number of sensor configurations returned * * @return Zero when successful, otherwise an error code * * @sa bsec_sensor_configuration_t * @sa bsec_physical_sensor_t * @sa bsec_virtual_sensor_t * \code{.c} // Example // // Change 3 virtual sensors (switch IAQ and raw temperature -> on / pressure -> off) bsec_sensor_configuration_t requested_virtual_sensors[3]; uint8_t n_requested_virtual_sensors = 3; requested_virtual_sensors[0].sensor_id = BSEC_OUTPUT_IAQ_ESTIMATE; requested_virtual_sensors[0].sample_rate = BSEC_SAMPLE_RATE_ULP; requested_virtual_sensors[1].sensor_id = BSEC_OUTPUT_RAW_TEMPERATURE; requested_virtual_sensors[1].sample_rate = BSEC_SAMPLE_RATE_ULP; requested_virtual_sensors[2].sensor_id = BSEC_OUTPUT_RAW_PRESSURE; requested_virtual_sensors[2].sample_rate = BSEC_SAMPLE_RATE_DISABLED; // Allocate a struct for the returned phyisical sensor settings bsec_sensor_configuration_t required_sensor_settings[BSEC_MAX_PHYSICAL_SENSOR]; uint8_t n_required_sensor_settings = BSEC_MAX_PHYSICAL_SENSOR; // Call bsec_update_subscription() to enable/disable the requested virtual sensors bsec_update_subscription(requested_virtual_sensors, n_requested_virtual_sensors, required_sensor_settings, &n_required_sensor_settings); \endcode * */ bsec_library_return_t bsec_update_subscription(const bsec_sensor_configuration_t * const requested_virtual_sensors, const uint8_t n_requested_virtual_sensors, bsec_sensor_configuration_t * required_sensor_settings, uint8_t * n_required_sensor_settings); /*! * @brief Main signal processing function of BSEC * * * Processing of the input signals and returning of output samples is performed by bsec_do_steps(). * - The samples of all library inputs must be passed with unique identifiers representing the input signals from * physical sensors where the order of these inputs can be chosen arbitrary. However, all input have to be provided * within the same time period as they are read. A sequential provision to the library might result in undefined * behaviour. * - The samples of all library outputs are returned with unique identifiers corresponding to the output signals of * virtual sensors where the order of the returned outputs may be arbitrary. * - The samples of all input as well as output signals of physical as well as virtual sensors use the same * representation in memory with the following fields: * - Sensor identifier: * - For inputs: required to identify the input signal from a physical sensor * - For output: overwritten by bsec_do_steps() to identify the returned signal from a virtual sensor * - Time stamp of the sample * * Calling bsec_do_steps() requires the samples of the input signals to be provided along with their time stamp when * they are recorded and only when they are acquired. Repetition of samples with the same time stamp are ignored and * result in a warning. Repetition of values of samples which are not acquired anew by a sensor result in deviations * of the computed output signals. Concerning the returned output samples, an important feature is, that a value is * returned for an output only when a new occurrence has been computed. A sample of an output signal is returned only * once. * * * @param[in] inputs Array of input data samples. Each array element represents a sample of a different physical sensor. * @param[in] n_inputs Number of passed input data structs. * @param[out] outputs Array of output data samples. Each array element represents a sample of a different virtual sensor. * @param[in,out] n_outputs [in] Number of allocated output structs, [out] number of outputs returned * * @return Zero when successful, otherwise an error code * \code{.c} // Example // // Allocate input and output memory bsec_input_t input[3]; uint8_t n_input = 3; bsec_output_t output[2]; uint8_t n_output=2; bsec_library_return_t status; // Populate the input structs, assuming the we have timestamp (ts), // gas sensor resistance (R), temperature (T), and humidity (rH) available // as input variables input[0].sensor_id = BSEC_INPUT_GASRESISTOR; input[0].signal = R; input[0].time_stamp= ts; input[1].sensor_id = BSEC_INPUT_TEMPERATURE; input[1].signal = T; input[1].time_stamp= ts; input[2].sensor_id = BSEC_INPUT_HUMIDITY; input[2].signal = rH; input[2].time_stamp= ts; // Invoke main processing BSEC function status = bsec_do_steps( input, n_input, output, &n_output ); // Iterature through the BSEC output data, if the call succeeded if(status == BSEC_OK) { for(int i = 0; i < n_output; i++) { switch(output[i].sensor_id) { case BSEC_OUTPUT_IAQ_ESTIMATE: // Retrieve the IAQ results from output[i].signal // and do something with the data break; case BSEC_OUTPUT_AMBIENT_TEMPERATURE: // Retrieve the ambient temperature results from output[i].signal // and do something with the data break; } } } \endcode */ bsec_library_return_t bsec_do_steps(const bsec_input_t * const inputs, const uint8_t n_inputs, bsec_output_t * outputs, uint8_t * n_outputs); /*! * @brief Reset a particular virtual sensor output * * This function allows specific virtual sensor outputs to be reset. The meaning of "reset" depends on the specific * output. In case of the IAQ output, reset means zeroing the output to the current ambient conditions. * * @param[in] sensor_id Virtual sensor to be reset * * @return Zero when successful, otherwise an error code * * \code{.c} // Example // bsec_reset_output(BSEC_OUTPUT_IAQ_ESTIMATE); \endcode */ bsec_library_return_t bsec_reset_output(uint8_t sensor_id); /*! * @brief Update algorithm configuration parameters * * BSEC uses a default configuration for the modules and common settings. The initial configuration can be customized * by bsec_set_configuration(). This is an optional step. * * @note A work buffer with sufficient size is required and has to be provided by the function caller to decompose * the serialization and apply it to the library and its modules. Please use #BSEC_MAX_PROPERTY_BLOB_SIZE for allotting * the required size. * * @param[in] serialized_settings Settings serialized to a binary blob * @param[in] n_serialized_settings Size of the settings blob * @param[in,out] work_buffer Work buffer used to parse the blob * @param[in] n_work_buffer_size Length of the work buffer available for parsing the blob * * @return Zero when successful, otherwise an error code * \code{.c} // Example // // Allocate variables uint8_t serialized_settings[BSEC_MAX_PROPERTY_BLOB_SIZE]; uint32_t n_serialized_settings_max = BSEC_MAX_PROPERTY_BLOB_SIZE; uint8_t work_buffer[BSEC_MAX_PROPERTY_BLOB_SIZE]; uint32_t n_work_buffer = BSEC_MAX_PROPERTY_BLOB_SIZE; // Here we will load a provided config string into serialized_settings // Apply the configuration bsec_set_configuration(serialized_settings, n_serialized_settings_max, work_buffer, n_work_buffer); \endcode */ bsec_library_return_t bsec_set_configuration(const uint8_t * const serialized_settings, const uint32_t n_serialized_settings, uint8_t * work_buffer, const uint32_t n_work_buffer_size); /*! * @brief Restore the internal state of the library * * BSEC uses a default state for all signal processing modules and the BSEC module. To ensure optimal performance, * especially of the gas sensor functionality, it is recommended to retrieve the state using bsec_get_state() * before unloading the library, storing it in some form of non-volatile memory, and setting it using bsec_set_state() * before resuming further operation of the library. * * @note A work buffer with sufficient size is required and has to be provided by the function caller to decompose the * serialization and apply it to the library and its modules. Please use #BSEC_MAX_PROPERTY_BLOB_SIZE for allotting the * required size. * * @param[in] serialized_state States serialized to a binary blob * @param[in] n_serialized_state Size of the state blob * @param[in,out] work_buffer Work buffer used to parse the blob * @param[in] n_work_buffer_size Length of the work buffer available for parsing the blob * * @return Zero when successful, otherwise an error code * \code{.c} // Example // // Allocate variables uint8_t serialized_state[BSEC_MAX_PROPERTY_BLOB_SIZE]; uint32_t n_serialized_state = BSEC_MAX_PROPERTY_BLOB_SIZE; uint8_t work_buffer_state[BSEC_MAX_PROPERTY_BLOB_SIZE]; uint32_t n_work_buffer_size = BSEC_MAX_PROPERTY_BLOB_SIZE; // Here we will load a state string from a previous use of BSEC // Apply the previous state to the current BSEC session bsec_set_state(serialized_state, n_serialized_state, work_buffer_state, n_work_buffer_size); \endcode */ bsec_library_return_t bsec_set_state(const uint8_t * const serialized_state, const uint32_t n_serialized_state, uint8_t * work_buffer, const uint32_t n_work_buffer_size); /*! * @brief Retrieve the current library configuration * * BSEC allows to retrieve the current configuration using bsec_get_configuration(). Returns a binary blob encoding * the current configuration parameters of the library in a format compatible with bsec_set_configuration(). * * @note The function bsec_get_configuration() is required to be used for debugging purposes only. * @note A work buffer with sufficient size is required and has to be provided by the function caller to decompose the * serialization and apply it to the library and its modules. Please use #BSEC_MAX_PROPERTY_BLOB_SIZE for allotting the * required size. * * * @param[in] config_id Identifier for a specific set of configuration settings to be returned; * shall be zero to retrieve all configuration settings. * @param[out] serialized_settings Buffer to hold the serialized config blob * @param[in] n_serialized_settings_max Maximum available size for the serialized settings * @param[in,out] work_buffer Work buffer used to parse the binary blob * @param[in] n_work_buffer Length of the work buffer available for parsing the blob * @param[out] n_serialized_settings Actual size of the returned serialized configuration blob * * @return Zero when successful, otherwise an error code * \code{.c} // Example // // Allocate variables uint8_t serialized_settings[BSEC_MAX_PROPERTY_BLOB_SIZE]; uint32_t n_serialized_settings_max = BSEC_MAX_PROPERTY_BLOB_SIZE; uint8_t work_buffer[BSEC_MAX_PROPERTY_BLOB_SIZE]; uint32_t n_work_buffer = BSEC_MAX_PROPERTY_BLOB_SIZE; uint32_t n_serialized_settings = 0; // Configuration of BSEC algorithm is stored in 'serialized_settings' bsec_get_configuration(0, serialized_settings, n_serialized_settings_max, work_buffer, n_work_buffer, &n_serialized_settings); \endcode */ bsec_library_return_t bsec_get_configuration(const uint8_t config_id, uint8_t * serialized_settings, const uint32_t n_serialized_settings_max, uint8_t * work_buffer, const uint32_t n_work_buffer, uint32_t * n_serialized_settings); /*! *@brief Retrieve the current internal library state * * BSEC allows to retrieve the current states of all signal processing modules and the BSEC module using * bsec_get_state(). This allows a restart of the processing after a reboot of the system by calling bsec_set_state(). * * @note A work buffer with sufficient size is required and has to be provided by the function caller to decompose the * serialization and apply it to the library and its modules. Please use #BSEC_MAX_PROPERTY_BLOB_SIZE for allotting the * required size. * * * @param[in] state_set_id Identifier for a specific set of states to be returned; shall be * zero to retrieve all states. * @param[out] serialized_state Buffer to hold the serialized config blob * @param[in] n_serialized_state_max Maximum available size for the serialized states * @param[in,out] work_buffer Work buffer used to parse the blob * @param[in] n_work_buffer Length of the work buffer available for parsing the blob * @param[out] n_serialized_state Actual size of the returned serialized blob * * @return Zero when successful, otherwise an error code * \code{.c} // Example // // Allocate variables uint8_t serialized_state[BSEC_MAX_PROPERTY_BLOB_SIZE]; uint32_t n_serialized_state_max=BSEC_MAX_PROPERTY_BLOB_SIZE; uint32_t n_serialized_state = BSEC_MAX_PROPERTY_BLOB_SIZE; uint8_t work_buffer_state[BSEC_MAX_PROPERTY_BLOB_SIZE]; uint32_t n_work_buffer_size = BSEC_MAX_PROPERTY_BLOB_SIZE; // Algorithm state is stored in 'serialized_state' bsec_get_state(0, serialized_state, n_serialized_state_max, work_buffer_state, n_work_buffer_size, &n_serialized_state); \endcode */ bsec_library_return_t bsec_get_state(const uint8_t state_set_id, uint8_t * serialized_state, const uint32_t n_serialized_state_max, uint8_t * work_buffer, const uint32_t n_work_buffer, uint32_t * n_serialized_state); /*! * @brief Retrieve BMExxx sensor instructions * * The bsec_sensor_control() interface is a key feature of BSEC, as it allows an easy way for the signal processing * library to control the operation of the BME sensor. This is important since gas sensor behaviour is mainly * determined by how the integrated heater is configured. To ensure an easy integration of BSEC into any system, * bsec_sensor_control() will provide the caller with information about the current sensor configuration that is * necessary to fulfill the input requirements derived from the current outputs requested via * bsec_update_subscription(). * * In practice the use of this function shall be as follows: * - Call bsec_sensor_control() which returns a bsec_bme_settings_t struct. * - Based on the information contained in this struct, the sensor is configured and a forced-mode measurement is * triggered if requested by bsec_sensor_control(). * - Once this forced-mode measurement is complete, the signals specified in this struct shall be passed to * bsec_do_steps() to perform the signal processing. * - After processing, the process should sleep until the bsec_bme_settings_t::next_call timestamp is reached. * * * @param [in] time_stamp Current timestamp in [ns] * @param[out] sensor_settings Settings to be passed to API to operate sensor at this time instance * * @return Zero when successful, otherwise an error code */ bsec_library_return_t bsec_sensor_control(const int64_t time_stamp, bsec_bme_settings_t *sensor_settings); /*@}*/ //BSEC Interface #ifdef __cplusplus } #endif #endif /* __BSEC_INTERFACE_H__ */