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562 lines
26 KiB
562 lines
26 KiB
/**
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* Copyright (C) Bosch Sensortec GmbH. All Rights Reserved. Confidential.
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*
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* Disclaimer
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*
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* Common:
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* Bosch Sensortec products are developed for the consumer goods industry. They may only be used
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* within the parameters of the respective valid product data sheet. Bosch Sensortec products are
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* provided with the express understanding that there is no warranty of fitness for a particular purpose.
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* They are not fit for use in life-sustaining, safety or security sensitive systems or any system or device
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* that may lead to bodily harm or property damage if the system or device malfunctions. In addition,
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* Bosch Sensortec products are not fit for use in products which interact with motor vehicle systems.
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* The resale and/or use of products are at the purchaser's own risk and his own responsibility. The
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* examination of fitness for the intended use is the sole responsibility of the Purchaser.
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*
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* The purchaser shall indemnify Bosch Sensortec from all third party claims, including any claims for
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* incidental, or consequential damages, arising from any product use not covered by the parameters of
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* the respective valid product data sheet or not approved by Bosch Sensortec and reimburse Bosch
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* Sensortec for all costs in connection with such claims.
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*
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* The purchaser must monitor the market for the purchased products, particularly with regard to
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* product safety and inform Bosch Sensortec without delay of all security relevant incidents.
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*
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* Engineering Samples are marked with an asterisk (*) or (e). Samples may vary from the valid
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* technical specifications of the product series. They are therefore not intended or fit for resale to third
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* parties or for use in end products. Their sole purpose is internal client testing. The testing of an
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* engineering sample may in no way replace the testing of a product series. Bosch Sensortec
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* assumes no liability for the use of engineering samples. By accepting the engineering samples, the
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* Purchaser agrees to indemnify Bosch Sensortec from all claims arising from the use of engineering
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* samples.
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*
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* Special:
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* This software module (hereinafter called "Software") and any information on application-sheets
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* (hereinafter called "Information") is provided free of charge for the sole purpose to support your
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* application work. The Software and Information is subject to the following terms and conditions:
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*
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* The Software is specifically designed for the exclusive use for Bosch Sensortec products by
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* personnel who have special experience and training. Do not use this Software if you do not have the
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* proper experience or training.
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*
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* This Software package is provided `` as is `` and without any expressed or implied warranties,
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* including without limitation, the implied warranties of merchantability and fitness for a particular
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* purpose.
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*
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* Bosch Sensortec and their representatives and agents deny any liability for the functional impairment
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* of this Software in terms of fitness, performance and safety. Bosch Sensortec and their
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* representatives and agents shall not be liable for any direct or indirect damages or injury, except as
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* otherwise stipulated in mandatory applicable law.
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*
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* The Information provided is believed to be accurate and reliable. Bosch Sensortec assumes no
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* responsibility for the consequences of use of such Information nor for any infringement of patents or
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* other rights of third parties which may result from its use. No license is granted by implication or
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* otherwise under any patent or patent rights of Bosch. Specifications mentioned in the Information are
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* subject to change without notice.
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*
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* It is not allowed to deliver the source code of the Software to any third party without permission of
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* Bosch Sensortec.
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*
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* @file bsec_interface.h
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*
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* @brief
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* Contains the API for BSEC
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*
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*/
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#ifndef __BSEC_INTERFACE_H__
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#define __BSEC_INTERFACE_H__
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#include "bsec_datatypes.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*! @addtogroup bsec_interface BSEC C Interface
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* @brief Interfaces of BSEC signal processing library
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*
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* ### Interface usage
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*
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* The following provides a short overview on the typical operation sequence for BSEC.
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*
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* - Initialization of the library
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*
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* | Steps | Function |
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* |---------------------------------------------------------------------|--------------------------|
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* | Initialization of library | bsec_init() |
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* | Update configuration settings (optional) | bsec_set_configuration() |
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* | Restore the state of the library (optional) | bsec_set_state() |
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*
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*
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* - The following function is called to enable output signals and define their sampling rate / operation mode.
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*
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* | Steps | Function |
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* |---------------------------------------------|----------------------------|
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* | Enable library outputs with specified mode | bsec_update_subscription() |
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*
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*
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* - This table describes the main processing loop.
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*
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* | Steps | Function |
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* |-------------------------------------------|----------------------------------|
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* | Retrieve sensor settings to be used | bsec_sensor_control() |
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* | Configure sensor and trigger measurement | See BME68x API and example codes |
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* | Read results from sensor | See BME68x API and example codes |
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* | Perform signal processing | bsec_do_steps() |
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*
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*
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* - Before shutting down the system, the current state of BSEC can be retrieved and can then be used during
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* re-initialization to continue processing.
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*
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* | Steps | Function |
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* |----------------------------------------|-------------------|
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* | To retrieve the current library state | bsec_get_state() |
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*
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*
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*
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* ### Configuration and state
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*
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* Values of variables belonging to a BSEC instance are divided into two groups:
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* - Values **not updated by processing** of signals belong to the **configuration group**. If available, BSEC can be
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* configured before use with a customer specific configuration string.
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* - Values **updated during processing** are member of the **state group**. Saving and restoring of the state of BSEC
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* is necessary to maintain previously estimated sensor models and baseline information which is important for best
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* performance of the gas sensor outputs.
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*
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* @note BSEC library consists of adaptive algorithms which models the gas sensor which improves its performance over
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* the time. These will be lost if library is initialized due to system reset. In order to avoid this situation
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* library state shall be stored in non volatile memory so that it can be loaded after system reset.
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*
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*
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* @{
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*/
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/*!
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* @brief Return the version information of BSEC library
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*
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* @param [out] bsec_version_p pointer to struct which is to be populated with the version information
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*
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* @return Zero if successful, otherwise an error code
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*
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* See also: bsec_version_t
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*
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\code{.c}
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// Example //
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bsec_version_t version;
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bsec_get_version(&version);
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printf("BSEC version: %d.%d.%d.%d",version.major, version.minor, version.major_bugfix, version.minor_bugfix);
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\endcode
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*/
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bsec_library_return_t bsec_get_version(bsec_version_t * bsec_version_p);
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/*!
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* @brief Initialize the library
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*
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* Initialization and reset of BSEC is performed by calling bsec_init(). Calling this function sets up the relation
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* among all internal modules, initializes run-time dependent library states and resets the configuration and state
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* of all BSEC signal processing modules to defaults.
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*
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* Before any further use, the library must be initialized. This ensure that all memory and states are in defined
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* conditions prior to processing any data.
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*
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* @return Zero if successful, otherwise an error code
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*
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\code{.c}
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// Initialize BSEC library before further use
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bsec_init();
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\endcode
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*/
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bsec_library_return_t bsec_init(void);
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/*!
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* @brief Subscribe to library virtual sensors outputs
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*
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* Use bsec_update_subscription() to instruct BSEC which of the processed output signals are requested at which sample rates.
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* See ::bsec_virtual_sensor_t for available library outputs.
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*
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* Based on the requested virtual sensors outputs, BSEC will provide information about the required physical sensor input signals
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* (see ::bsec_physical_sensor_t) with corresponding sample rates. This information is purely informational as bsec_sensor_control()
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* will ensure the sensor is operated in the required manner. To disable a virtual sensor, set the sample rate to BSEC_SAMPLE_RATE_DISABLED.
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*
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* The subscription update using bsec_update_subscription() is apart from the signal processing one of the the most
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* important functions. It allows to enable the desired library outputs. The function determines which physical input
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* sensor signals are required at which sample rate to produce the virtual output sensor signals requested by the user.
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* When this function returns with success, the requested outputs are called subscribed. A very important feature is the
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* retaining of already subscribed outputs. Further outputs can be requested or disabled both individually and
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* group-wise in addition to already subscribed outputs without changing them unless a change of already subscribed
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* outputs is requested.
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*
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* @note The state of the library concerning the subscribed outputs cannot be retained among reboots.
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*
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* The interface of bsec_update_subscription() requires the usage of arrays of sensor configuration structures.
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* Such a structure has the fields sensor identifier and sample rate. These fields have the properties:
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* - Output signals of virtual sensors must be requested using unique identifiers (Member of ::bsec_virtual_sensor_t)
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* - Different sets of identifiers are available for inputs of physical sensors and outputs of virtual sensors
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* - Identifiers are unique values defined by the library, not from external
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* - Sample rates must be provided as value of
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* - An allowed sample rate for continuously sampled signals
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* - 65535.0f (BSEC_SAMPLE_RATE_DISABLED) to turn off outputs and identify disabled inputs
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*
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* @note The same sensor identifiers are also used within the functions bsec_do_steps().
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*
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* The usage principles of bsec_update_subscription() are:
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* - Differential updates (i.e., only asking for outputs that the user would like to change) is supported.
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* - Invalid requests of outputs are ignored. Also if one of the requested outputs is unavailable, all the requests
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* are ignored. At the same time, a warning is returned.
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* - To disable BSEC, all outputs shall be turned off. Only enabled (subscribed) outputs have to be disabled while
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* already disabled outputs do not have to be disabled explicitly.
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*
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* @param[in] requested_virtual_sensors Pointer to array of requested virtual sensor (output) configurations for the library
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* @param[in] n_requested_virtual_sensors Number of virtual sensor structs pointed by requested_virtual_sensors
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* @param[out] required_sensor_settings Pointer to array of required physical sensor configurations for the library
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* @param[in,out] n_required_sensor_settings [in] Size of allocated required_sensor_settings array, [out] number of sensor configurations returned
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*
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* @return Zero when successful, otherwise an error code
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*
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* @sa bsec_sensor_configuration_t
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* @sa bsec_physical_sensor_t
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* @sa bsec_virtual_sensor_t
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*
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\code{.c}
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// Example //
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// Change 3 virtual sensors (switch IAQ and raw temperature -> on / pressure -> off)
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bsec_sensor_configuration_t requested_virtual_sensors[3];
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uint8_t n_requested_virtual_sensors = 3;
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requested_virtual_sensors[0].sensor_id = BSEC_OUTPUT_IAQ;
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requested_virtual_sensors[0].sample_rate = BSEC_SAMPLE_RATE_ULP;
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requested_virtual_sensors[1].sensor_id = BSEC_OUTPUT_RAW_TEMPERATURE;
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requested_virtual_sensors[1].sample_rate = BSEC_SAMPLE_RATE_ULP;
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requested_virtual_sensors[2].sensor_id = BSEC_OUTPUT_RAW_PRESSURE;
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requested_virtual_sensors[2].sample_rate = BSEC_SAMPLE_RATE_DISABLED;
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// Allocate a struct for the returned physical sensor settings
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bsec_sensor_configuration_t required_sensor_settings[BSEC_MAX_PHYSICAL_SENSOR];
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uint8_t n_required_sensor_settings = BSEC_MAX_PHYSICAL_SENSOR;
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// Call bsec_update_subscription() to enable/disable the requested virtual sensors
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bsec_update_subscription(requested_virtual_sensors, n_requested_virtual_sensors, required_sensor_settings, &n_required_sensor_settings);
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\endcode
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*
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*/
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bsec_library_return_t bsec_update_subscription(const bsec_sensor_configuration_t * requested_virtual_sensors,
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uint8_t n_requested_virtual_sensors, bsec_sensor_configuration_t * required_sensor_settings,
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uint8_t * n_required_sensor_settings);
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/*!
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* @brief Main signal processing function of BSEC
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*
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*
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* Processing of the input signals and returning of output samples is performed by bsec_do_steps().
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* - The samples of all library inputs must be passed with unique identifiers representing the input signals from
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* physical sensors where the order of these inputs can be chosen arbitrary. However, all input have to be provided
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* within the same time period as they are read. A sequential provision to the library might result in undefined
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* behavior.
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* - The samples of all library outputs are returned with unique identifiers corresponding to the output signals of
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* virtual sensors where the order of the returned outputs may be arbitrary.
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* - The samples of all input as well as output signals of physical as well as virtual sensors use the same
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* representation in memory with the following fields:
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* - Sensor identifier:
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* - For inputs: required to identify the input signal from a physical sensor
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* - For output: overwritten by bsec_do_steps() to identify the returned signal from a virtual sensor
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* - Time stamp of the sample
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*
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* Calling bsec_do_steps() requires the samples of the input signals to be provided along with their time stamp when
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* they are recorded and only when they are acquired. Repetition of samples with the same time stamp are ignored and
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* result in a warning. Repetition of values of samples which are not acquired anew by a sensor result in deviations
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* of the computed output signals. Concerning the returned output samples, an important feature is, that a value is
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* returned for an output only when a new occurrence has been computed. A sample of an output signal is returned only
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* once.
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*
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*
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* @param[in] inputs Array of input data samples. Each array element represents a sample of a different physical sensor.
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* @param[in] n_inputs Number of passed input data structs.
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* @param[out] outputs Array of output data samples. Each array element represents a sample of a different virtual sensor.
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* @param[in,out] n_outputs [in] Number of allocated output structs, [out] number of outputs returned
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*
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* @return Zero when successful, otherwise an error code
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*
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\code{.c}
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// Example //
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// Allocate input and output memory
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bsec_input_t input[3];
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uint8_t n_input = 3;
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bsec_output_t output[2];
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uint8_t n_output=2;
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bsec_library_return_t status;
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// Populate the input structs, assuming the we have timestamp (ts),
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// gas sensor resistance (R), temperature (T), and humidity (rH) available
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// as input variables
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input[0].sensor_id = BSEC_INPUT_GASRESISTOR;
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input[0].signal = R;
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input[0].time_stamp= ts;
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input[1].sensor_id = BSEC_INPUT_TEMPERATURE;
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input[1].signal = T;
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input[1].time_stamp= ts;
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input[2].sensor_id = BSEC_INPUT_HUMIDITY;
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input[2].signal = rH;
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input[2].time_stamp= ts;
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// Invoke main processing BSEC function
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status = bsec_do_steps( input, n_input, output, &n_output );
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// Iterate through the BSEC output data, if the call succeeded
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if(status == BSEC_OK)
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{
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for(int i = 0; i < n_output; i++)
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{
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switch(output[i].sensor_id)
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{
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case BSEC_OUTPUT_IAQ:
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// Retrieve the IAQ results from output[i].signal
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// and do something with the data
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break;
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case BSEC_OUTPUT_AMBIENT_TEMPERATURE:
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// Retrieve the ambient temperature results from output[i].signal
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// and do something with the data
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break;
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}
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}
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}
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\endcode
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*/
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bsec_library_return_t bsec_do_steps(const bsec_input_t * inputs, uint8_t n_inputs, bsec_output_t * outputs, uint8_t * n_outputs);
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/*!
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* @brief Reset a particular virtual sensor output
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*
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* This function allows specific virtual sensor outputs to be reset. The meaning of "reset" depends on the specific
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* output. In case of the IAQ output, reset means zeroing the output to the current ambient conditions.
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*
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* @param[in] sensor_id Virtual sensor to be reset
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*
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* @return Zero when successful, otherwise an error code
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*
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*
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\code{.c}
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// Example //
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bsec_reset_output(BSEC_OUTPUT_IAQ);
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\endcode
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*/
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bsec_library_return_t bsec_reset_output(uint8_t sensor_id);
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/*!
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* @brief Update algorithm configuration parameters
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*
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* BSEC uses a default configuration for the modules and common settings. The initial configuration can be customized
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* by bsec_set_configuration(). This is an optional step.
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*
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* @note A work buffer with sufficient size is required and has to be provided by the function caller to decompose
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* the serialization and apply it to the library and its modules.
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*
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* Please use #BSEC_MAX_PROPERTY_BLOB_SIZE for allotting the required size.
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*
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* @param[in] serialized_settings Settings serialized to a binary blob
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* @param[in] n_serialized_settings Size of the settings blob
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* @param[in,out] work_buffer Work buffer used to parse the blob
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* @param[in] n_work_buffer_size Length of the work buffer available for parsing the blob
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*
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* @return Zero when successful, otherwise an error code
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*
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\code{.c}
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// Example //
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// Allocate variables
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uint8_t serialized_settings[BSEC_MAX_PROPERTY_BLOB_SIZE];
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uint32_t n_serialized_settings_max = BSEC_MAX_PROPERTY_BLOB_SIZE;
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uint8_t work_buffer[BSEC_MAX_WORKBUFFER_SIZE];
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uint32_t n_work_buffer = BSEC_MAX_WORKBUFFER_SIZE;
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// Here we will load a provided config string into serialized_settings
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// Apply the configuration
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bsec_set_configuration(serialized_settings, n_serialized_settings_max, work_buffer, n_work_buffer);
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\endcode
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*/
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bsec_library_return_t bsec_set_configuration(const uint8_t * serialized_settings,
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uint32_t n_serialized_settings, uint8_t * work_buffer,
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uint32_t n_work_buffer_size);
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/*!
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* @brief Restore the internal state of the library
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*
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* BSEC uses a default state for all signal processing modules and the BSEC module. To ensure optimal performance,
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* especially of the gas sensor functionality, it is recommended to retrieve the state using bsec_get_state()
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* before unloading the library, storing it in some form of non-volatile memory, and setting it using bsec_set_state()
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* before resuming further operation of the library.
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*
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* @note A work buffer with sufficient size is required and has to be provided by the function caller to decompose the
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* serialization and apply it to the library and its modules.
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*
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* Please use #BSEC_MAX_STATE_BLOB_SIZE for allotting the required size.
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*
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* @param[in] serialized_state States serialized to a binary blob
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* @param[in] n_serialized_state Size of the state blob
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* @param[in,out] work_buffer Work buffer used to parse the blob
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* @param[in] n_work_buffer_size Length of the work buffer available for parsing the blob
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*
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* @return Zero when successful, otherwise an error code
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*
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\code{.c}
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// Example //
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// Allocate variables
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uint8_t serialized_state[BSEC_MAX_PROPERTY_BLOB_SIZE];
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uint32_t n_serialized_state = BSEC_MAX_PROPERTY_BLOB_SIZE;
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uint8_t work_buffer_state[BSEC_MAX_WORKBUFFER_SIZE];
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uint32_t n_work_buffer_size = BSEC_MAX_WORKBUFFER_SIZE;
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// Here we will load a state string from a previous use of BSEC
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// Apply the previous state to the current BSEC session
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bsec_set_state(serialized_state, n_serialized_state, work_buffer_state, n_work_buffer_size);
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\endcode
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*/
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bsec_library_return_t bsec_set_state(const uint8_t * serialized_state, uint32_t n_serialized_state,
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uint8_t * work_buffer, uint32_t n_work_buffer_size);
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/*!
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* @brief Retrieve the current library configuration
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*
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* BSEC allows to retrieve the current configuration using bsec_get_configuration(). Returns a binary blob encoding
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* the current configuration parameters of the library in a format compatible with bsec_set_configuration().
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*
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* @note The function bsec_get_configuration() is required to be used for debugging purposes only.
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* @note A work buffer with sufficient size is required and has to be provided by the function caller to decompose the
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* serialization and apply it to the library and its modules.
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*
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* Please use #BSEC_MAX_PROPERTY_BLOB_SIZE for allotting the required size.
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*
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* @param[in] config_id Identifier for a specific set of configuration settings to be returned;
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* shall be zero to retrieve all configuration settings.
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* @param[out] serialized_settings Buffer to hold the serialized config blob
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* @param[in] n_serialized_settings_max Maximum available size for the serialized settings
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* @param[in,out] work_buffer Work buffer used to parse the binary blob
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* @param[in] n_work_buffer Length of the work buffer available for parsing the blob
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* @param[out] n_serialized_settings Actual size of the returned serialized configuration blob
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*
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* @return Zero when successful, otherwise an error code
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*
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\code{.c}
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// Example //
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// Allocate variables
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uint8_t serialized_settings[BSEC_MAX_PROPERTY_BLOB_SIZE];
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uint32_t n_serialized_settings_max = BSEC_MAX_PROPERTY_BLOB_SIZE;
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uint8_t work_buffer[BSEC_MAX_WORKBUFFER_SIZE];
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uint32_t n_work_buffer = BSEC_MAX_WORKBUFFER_SIZE;
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uint32_t n_serialized_settings = 0;
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// Configuration of BSEC algorithm is stored in 'serialized_settings'
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bsec_get_configuration(0, serialized_settings, n_serialized_settings_max, work_buffer, n_work_buffer, &n_serialized_settings);
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\endcode
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*/
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bsec_library_return_t bsec_get_configuration(uint8_t config_id, uint8_t * serialized_settings, uint32_t n_serialized_settings_max,
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uint8_t * work_buffer, uint32_t n_work_buffer, uint32_t * n_serialized_settings);
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/*!
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*@brief Retrieve the current internal library state
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*
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* BSEC allows to retrieve the current states of all signal processing modules and the BSEC module using
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* bsec_get_state(). This allows a restart of the processing after a reboot of the system by calling bsec_set_state().
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*
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* @note A work buffer with sufficient size is required and has to be provided by the function caller to decompose the
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* serialization and apply it to the library and its modules.
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*
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* Please use #BSEC_MAX_STATE_BLOB_SIZE for allotting the required size.
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*
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* @param[in] state_set_id Identifier for a specific set of states to be returned; shall be
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* zero to retrieve all states.
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* @param[out] serialized_state Buffer to hold the serialized config blob
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* @param[in] n_serialized_state_max Maximum available size for the serialized states
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* @param[in,out] work_buffer Work buffer used to parse the blob
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* @param[in] n_work_buffer Length of the work buffer available for parsing the blob
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* @param[out] n_serialized_state Actual size of the returned serialized blob
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*
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* @return Zero when successful, otherwise an error code
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*
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\code{.c}
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// Example //
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// Allocate variables
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uint8_t serialized_state[BSEC_MAX_STATE_BLOB_SIZE];
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uint32_t n_serialized_state_max = BSEC_MAX_STATE_BLOB_SIZE;
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uint32_t n_serialized_state = BSEC_MAX_STATE_BLOB_SIZE;
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uint8_t work_buffer_state[BSEC_MAX_WORKBUFFER_SIZE];
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uint32_t n_work_buffer_size = BSEC_MAX_WORKBUFFER_SIZE;
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// Algorithm state is stored in 'serialized_state'
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bsec_get_state(0, serialized_state, n_serialized_state_max, work_buffer_state, n_work_buffer_size, &n_serialized_state);
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\endcode
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*/
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bsec_library_return_t bsec_get_state(uint8_t state_set_id, uint8_t * serialized_state,
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uint32_t n_serialized_state_max, uint8_t * work_buffer, uint32_t n_work_buffer,
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uint32_t * n_serialized_state);
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/*!
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* @brief Retrieve BMExxx sensor instructions
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*
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* The bsec_sensor_control() interface is a key feature of BSEC, as it allows an easy way for the signal processing
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* library to control the operation of the BME sensor. This is important since gas sensor behaviour is mainly
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* determined by how the integrated heater is configured. To ensure an easy integration of BSEC into any system,
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* bsec_sensor_control() will provide the caller with information about the current sensor configuration that is
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* necessary to fulfill the input requirements derived from the current outputs requested via
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* bsec_update_subscription().
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*
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* In practice the use of this function shall be as follows:
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* - Call bsec_sensor_control() which returns a bsec_bme_settings_t struct.
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* - Based on the information contained in this struct, the sensor is configured and a forced-mode measurement is
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* triggered if requested by bsec_sensor_control().
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* - Once this forced-mode measurement is complete, the signals specified in this struct shall be passed to
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* bsec_do_steps() to perform the signal processing.
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* - After processing, the process should sleep until the bsec_bme_settings_t::next_call timestamp is reached.
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*
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*
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* @param [in] time_stamp Current timestamp in [ns]
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* @param[out] sensor_settings Settings to be passed to API to operate sensor at this time instance
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*
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* @return Zero when successful, otherwise an error code
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*/
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bsec_library_return_t bsec_sensor_control(int64_t time_stamp, bsec_bme_settings_t *sensor_settings);
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/*@}*/ //BSEC Interface
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#ifdef __cplusplus
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}
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#endif
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#endif /* __BSEC_INTERFACE_H__ */
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