B3M38SPD seminar project - beehive monitor with LoRa reporting
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spd-lorabees/Drivers/BME680/bsec_interface.h

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/*
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*
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/*!
*
* @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__ */