example_detector_presence_low_power_hibernate.c

This is an example on how to put the sensor in hibernation and the system in a low power state between measurements
The example executes as follows:

• Create a presence configuration
• Create a sensor instance
• Enable sensor
• Create a detector instance
• Calibrate the sensor
• Prepare the detector
• Enter hibernation
• Loop forever:
  • Exit hibernation
  • Perform a sensor measurement and read out the data
  • Enter hibernation
  • Process the measurement and get detector result
  • Put the system in deep sleep for a specified amount of time
• Destroy the configuration
• Destroy the detector instance
• Destroy the sensor instance

// Copyright (c) Acconeer AB, 2022-2025
// All rights reserved
// This file is subject to the terms and conditions defined in the file
// 'LICENSES/license_acconeer.txt', (BSD 3-Clause License) which is part
// of this source code package.
 
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
 
#include "acc_definitions_a121.h"
#include "acc_definitions_common.h"
#include "acc_detector_presence.h"
#include "acc_hal_definitions_a121.h"
#include "acc_hal_integration_a121.h"
#include "acc_integration.h"
#include "acc_rss_a121.h"
#include "acc_sensor.h"
 
#include "acc_version.h"
 
/** \example example_detector_presence_low_power_hibernate.c
 * @brief This is an example on how to put the sensor in hibernation and the system in a low power state between measurements
 * @n
 * The example executes as follows:
 *   - Create a presence configuration
 *   - Create a sensor instance
 *   - Enable sensor
 *   - Create a detector instance
 *   - Calibrate the sensor
 *   - Prepare the detector
 *   - Enter hibernation
 *   - Loop forever:
 *     - Exit hibernation
 *     - Perform a sensor measurement and read out the data
 *     - Enter hibernation
 *     - Process the measurement and get detector result
 *     - Put the system in deep sleep for a specified amount of time
 *   - Destroy the configuration
 *   - Destroy the detector instance
 *   - Destroy the sensor instance
 */
 
typedef enum
{
        PRESENCE_PRESET_CONFIG_NONE = 0,
        PRESENCE_PRESET_CONFIG_SHORT_RANGE,
        PRESENCE_PRESET_CONFIG_MEDIUM_RANGE,
        PRESENCE_PRESET_CONFIG_LONG_RANGE,
        PRESENCE_PRESET_CONFIG_LOW_POWER_WAKEUP,
} presence_preset_config_t;
 
#define SENSOR_ID         (1U)
#define SENSOR_TIMEOUT_MS (1000U)
 
#define DEFAULT_PRESET_CONFIG PRESENCE_PRESET_CONFIG_MEDIUM_RANGE
 
static bool do_sensor_calibration(acc_sensor_t *sensor, acc_cal_result_t *cal_result, void *buffer, uint32_t buffer_size);
 
static void print_result(acc_detector_presence_result_t *result);
 
static void cleanup(acc_detector_presence_handle_t *presence_handle,
                    acc_detector_presence_config_t *presence_config,
                    acc_sensor_t                   *sensor,
                    void                           *buffer);
 
static void set_config(acc_detector_presence_config_t *presence_config, presence_preset_config_t preset);
 
int acconeer_main(int argc, char *argv[]);
 
int acconeer_main(int argc, char *argv[])
{
        (void)argc;
        (void)argv;
        acc_detector_presence_config_t  *presence_config = NULL;
        acc_detector_presence_handle_t  *presence_handle = NULL;
        acc_detector_presence_metadata_t metadata;
        acc_sensor_t                    *sensor      = NULL;
        void                            *buffer      = NULL;
        uint32_t                         buffer_size = 0U;
 
        printf("Acconeer software version %s\n", acc_version_get());
 
        const acc_hal_a121_t *hal = acc_hal_rss_integration_get_implementation();
 
        if (!acc_rss_hal_register(hal))
        {
                return EXIT_FAILURE;
        }
 
        presence_config = acc_detector_presence_config_create();
        if (presence_config == NULL)
        {
                printf("acc_detector_presence_config_create() failed\n");
                cleanup(presence_handle, presence_config, sensor, buffer);
                return EXIT_FAILURE;
        }
 
        set_config(presence_config, DEFAULT_PRESET_CONFIG);
 
        uint32_t sleep_time_ms = (uint32_t)(1000.0f / acc_detector_presence_config_frame_rate_get(presence_config));
 
        acc_integration_set_periodic_wakeup(sleep_time_ms);
 
        presence_handle = acc_detector_presence_create(presence_config, &metadata);
        if (presence_handle == NULL)
        {
                printf("acc_detector_presence_create() failed\n");
                cleanup(presence_handle, presence_config, sensor, buffer);
                return EXIT_FAILURE;
        }
 
        if (!acc_detector_presence_get_buffer_size(presence_handle, &buffer_size))
        {
                printf("acc_detector_presence_get_buffer_size() failed\n");
                cleanup(presence_handle, presence_config, sensor, buffer);
                return EXIT_FAILURE;
        }
 
        buffer = acc_integration_mem_alloc(buffer_size);
        if (buffer == NULL)
        {
                printf("buffer allocation failed\n");
                cleanup(presence_handle, presence_config, sensor, buffer);
                return EXIT_FAILURE;
        }
 
        acc_hal_integration_sensor_supply_on(SENSOR_ID);
        acc_hal_integration_sensor_enable(SENSOR_ID);
 
        sensor = acc_sensor_create(SENSOR_ID);
        if (sensor == NULL)
        {
                printf("acc_sensor_create() failed\n");
                cleanup(presence_handle, presence_config, sensor, buffer);
                return EXIT_FAILURE;
        }
 
        acc_cal_result_t cal_result;
 
        if (!do_sensor_calibration(sensor, &cal_result, buffer, buffer_size))
        {
                printf("do_sensor_calibration() failed\n");
                cleanup(presence_handle, presence_config, sensor, buffer);
                return EXIT_FAILURE;
        }
 
        // Reset sensor after calibration by disabling it
        acc_hal_integration_sensor_disable(SENSOR_ID);
 
        acc_hal_integration_sensor_enable(SENSOR_ID);
 
        if (!acc_detector_presence_prepare(presence_handle, presence_config, sensor, &cal_result, buffer, buffer_size))
        {
                printf("acc_detector_presence_prepare() failed\n");
                cleanup(presence_handle, presence_config, sensor, buffer);
                return EXIT_FAILURE;
        }
 
        if (!acc_sensor_hibernate_on(sensor))
        {
                printf("acc_sensor_hibernate_on failed\n");
                acc_sensor_status(sensor);
                cleanup(presence_handle, presence_config, sensor, buffer);
                return EXIT_FAILURE;
        }
 
        acc_hal_integration_sensor_disable(SENSOR_ID);
 
        while (true)
        {
                acc_detector_presence_result_t result;
 
                acc_hal_integration_sensor_enable(SENSOR_ID);
                if (!acc_sensor_hibernate_off(sensor))
                {
                        printf("acc_sensor_hibernate_off failed\n");
                        acc_sensor_status(sensor);
                        cleanup(presence_handle, presence_config, sensor, buffer);
                        return EXIT_FAILURE;
                }
 
                if (!acc_sensor_measure(sensor))
                {
                        printf("acc_sensor_measure failed\n");
                        cleanup(presence_handle, presence_config, sensor, buffer);
                        return EXIT_FAILURE;
                }
 
                if (!acc_hal_integration_wait_for_sensor_interrupt(SENSOR_ID, SENSOR_TIMEOUT_MS))
                {
                        printf("Sensor interrupt timeout\n");
                        cleanup(presence_handle, presence_config, sensor, buffer);
                        return EXIT_FAILURE;
                }
 
                if (!acc_sensor_read(sensor, buffer, buffer_size))
                {
                        printf("acc_sensor_read failed\n");
                        cleanup(presence_handle, presence_config, sensor, buffer);
                        return EXIT_FAILURE;
                }
 
                if (!acc_sensor_hibernate_on(sensor))
                {
                        printf("acc_sensor_hibernate_on failed\n");
                        acc_sensor_status(sensor);
                        cleanup(presence_handle, presence_config, sensor, buffer);
                        return EXIT_FAILURE;
                }
 
                acc_hal_integration_sensor_disable(SENSOR_ID);
 
                if (!acc_detector_presence_process(presence_handle, buffer, &result))
                {
                        printf("acc_detector_presence_process failed\n");
                        cleanup(presence_handle, presence_config, sensor, buffer);
                        return EXIT_FAILURE;
                }
 
                /* If "calibration_needed" is indicated, the sensor needs to be recalibrated. */
                if (result.processing_result.calibration_needed)
                {
                        printf("Sensor recalibration needed ... \n");
 
                        acc_hal_integration_sensor_enable(SENSOR_ID);
 
                        if (!acc_sensor_hibernate_off(sensor))
                        {
                                printf("acc_sensor_hibernate_off failed\n");
                                acc_sensor_status(sensor);
                                cleanup(presence_handle, presence_config, sensor, buffer);
                                return EXIT_FAILURE;
                        }
 
                        if (!do_sensor_calibration(sensor, &cal_result, buffer, buffer_size))
                        {
                                printf("do_sensor_calibration() failed\n");
                                cleanup(presence_handle, presence_config, sensor, buffer);
                                return EXIT_FAILURE;
                        }
 
                        printf("Sensor recalibration done!\n");
 
                        /* Before measuring again, the sensor needs to be prepared through the detector. */
                        if (!acc_detector_presence_prepare(presence_handle, presence_config, sensor, &cal_result, buffer, buffer_size))
                        {
                                printf("acc_detector_presence_prepare() failed\n");
                                cleanup(presence_handle, presence_config, sensor, buffer);
                                return EXIT_FAILURE;
                        }
 
                        if (!acc_sensor_hibernate_on(sensor))
                        {
                                printf("acc_sensor_hibernate_on failed\n");
                                acc_sensor_status(sensor);
                                cleanup(presence_handle, presence_config, sensor, buffer);
                                return EXIT_FAILURE;
                        }
 
                        acc_hal_integration_sensor_disable(SENSOR_ID);
                }
                else
                {
                        print_result(&result);
                }
 
                acc_integration_sleep_until_periodic_wakeup();
        }
 
        cleanup(presence_handle, presence_config, sensor, buffer);
 
        printf("Application finished OK\n");
 
        return EXIT_SUCCESS;
}
 
static void cleanup(acc_detector_presence_handle_t *presence_handle,
                    acc_detector_presence_config_t *presence_config,
                    acc_sensor_t                   *sensor,
                    void                           *buffer)
{
        acc_hal_integration_sensor_disable(SENSOR_ID);
        acc_hal_integration_sensor_supply_off(SENSOR_ID);
 
        if (presence_config != NULL)
        {
                acc_detector_presence_config_destroy(presence_config);
        }
 
        if (presence_handle != NULL)
        {
                acc_detector_presence_destroy(presence_handle);
        }
 
        if (sensor != NULL)
        {
                acc_sensor_destroy(sensor);
        }
 
        if (buffer != NULL)
        {
                acc_integration_mem_free(buffer);
        }
}
 
static void set_config(acc_detector_presence_config_t *presence_config, presence_preset_config_t preset)
{
        switch (preset)
        {
                case PRESENCE_PRESET_CONFIG_NONE:
                        acc_detector_presence_config_frame_rate_app_driven_set(presence_config, true);
                        // Add configuration of the detector here
                        break;
 
                case PRESENCE_PRESET_CONFIG_SHORT_RANGE:
                        acc_detector_presence_config_start_set(presence_config, 0.06f);
                        acc_detector_presence_config_end_set(presence_config, 1.0f);
                        acc_detector_presence_config_automatic_subsweeps_set(presence_config, true);
                        acc_detector_presence_config_signal_quality_set(presence_config, 30.0f);
                        acc_detector_presence_config_inter_frame_idle_state_set(presence_config, ACC_CONFIG_IDLE_STATE_DEEP_SLEEP);
                        acc_detector_presence_config_sweeps_per_frame_set(presence_config, 16);
                        acc_detector_presence_config_frame_rate_set(presence_config, 10.0f);
                        acc_detector_presence_config_frame_rate_app_driven_set(presence_config, true);
                        acc_detector_presence_config_reset_filters_on_prepare_set(presence_config, true);
                        acc_detector_presence_config_intra_detection_set(presence_config, true);
                        acc_detector_presence_config_intra_detection_threshold_set(presence_config, 1.4f);
                        acc_detector_presence_config_intra_frame_time_const_set(presence_config, 0.15f);
                        acc_detector_presence_config_intra_output_time_const_set(presence_config, 0.3f);
                        acc_detector_presence_config_inter_detection_set(presence_config, true);
                        acc_detector_presence_config_inter_detection_threshold_set(presence_config, 1.0f);
                        acc_detector_presence_config_inter_frame_deviation_time_const_set(presence_config, 0.5f);
                        acc_detector_presence_config_inter_frame_fast_cutoff_set(presence_config, 5.0f);
                        acc_detector_presence_config_inter_frame_slow_cutoff_set(presence_config, 0.20f);
                        acc_detector_presence_config_inter_output_time_const_set(presence_config, 2.0f);
                        acc_detector_presence_config_inter_frame_presence_timeout_set(presence_config, 3);
 
                        break;
 
                case PRESENCE_PRESET_CONFIG_MEDIUM_RANGE:
                        acc_detector_presence_config_start_set(presence_config, 0.3f);
                        acc_detector_presence_config_end_set(presence_config, 2.5f);
                        acc_detector_presence_config_automatic_subsweeps_set(presence_config, true);
                        acc_detector_presence_config_signal_quality_set(presence_config, 20.0f);
                        acc_detector_presence_config_inter_frame_idle_state_set(presence_config, ACC_CONFIG_IDLE_STATE_DEEP_SLEEP);
                        acc_detector_presence_config_sweeps_per_frame_set(presence_config, 16);
                        acc_detector_presence_config_frame_rate_set(presence_config, 12.0f);
                        acc_detector_presence_config_frame_rate_app_driven_set(presence_config, true);
                        acc_detector_presence_config_reset_filters_on_prepare_set(presence_config, true);
                        acc_detector_presence_config_intra_detection_set(presence_config, true);
                        acc_detector_presence_config_intra_detection_threshold_set(presence_config, 1.3f);
                        acc_detector_presence_config_intra_frame_time_const_set(presence_config, 0.15f);
                        acc_detector_presence_config_intra_output_time_const_set(presence_config, 0.3f);
                        acc_detector_presence_config_inter_detection_set(presence_config, true);
                        acc_detector_presence_config_inter_detection_threshold_set(presence_config, 1.0f);
                        acc_detector_presence_config_inter_frame_deviation_time_const_set(presence_config, 0.5f);
                        acc_detector_presence_config_inter_frame_fast_cutoff_set(presence_config, 6.0f);
                        acc_detector_presence_config_inter_frame_slow_cutoff_set(presence_config, 0.20f);
                        acc_detector_presence_config_inter_output_time_const_set(presence_config, 2.0f);
                        acc_detector_presence_config_inter_frame_presence_timeout_set(presence_config, 3);
 
                        break;
 
                case PRESENCE_PRESET_CONFIG_LONG_RANGE:
                        acc_detector_presence_config_start_set(presence_config, 5.0f);
                        acc_detector_presence_config_end_set(presence_config, 7.5f);
                        acc_detector_presence_config_automatic_subsweeps_set(presence_config, true);
                        acc_detector_presence_config_signal_quality_set(presence_config, 10.0f);
                        acc_detector_presence_config_inter_frame_idle_state_set(presence_config, ACC_CONFIG_IDLE_STATE_DEEP_SLEEP);
                        acc_detector_presence_config_sweeps_per_frame_set(presence_config, 16);
                        acc_detector_presence_config_frame_rate_set(presence_config, 12.0f);
                        acc_detector_presence_config_frame_rate_app_driven_set(presence_config, true);
                        acc_detector_presence_config_reset_filters_on_prepare_set(presence_config, true);
                        acc_detector_presence_config_intra_detection_set(presence_config, true);
                        acc_detector_presence_config_intra_detection_threshold_set(presence_config, 1.2f);
                        acc_detector_presence_config_intra_frame_time_const_set(presence_config, 0.15f);
                        acc_detector_presence_config_intra_output_time_const_set(presence_config, 0.3f);
                        acc_detector_presence_config_inter_detection_set(presence_config, true);
                        acc_detector_presence_config_inter_detection_threshold_set(presence_config, 0.8f);
                        acc_detector_presence_config_inter_frame_deviation_time_const_set(presence_config, 0.5f);
                        acc_detector_presence_config_inter_frame_fast_cutoff_set(presence_config, 6.0f);
                        acc_detector_presence_config_inter_frame_slow_cutoff_set(presence_config, 0.20f);
                        acc_detector_presence_config_inter_output_time_const_set(presence_config, 2.0f);
                        acc_detector_presence_config_inter_frame_presence_timeout_set(presence_config, 3);
 
                        break;
 
                case PRESENCE_PRESET_CONFIG_LOW_POWER_WAKEUP:
                        acc_detector_presence_config_start_set(presence_config, 0.38f);
                        acc_detector_presence_config_end_set(presence_config, 0.67f);
                        acc_detector_presence_config_automatic_subsweeps_set(presence_config, false);
                        acc_detector_presence_config_auto_step_length_set(presence_config, true);
                        acc_detector_presence_config_auto_profile_set(presence_config, false);
                        acc_detector_presence_config_profile_set(presence_config, ACC_CONFIG_PROFILE_5);
                        acc_detector_presence_config_inter_frame_idle_state_set(presence_config, ACC_CONFIG_IDLE_STATE_DEEP_SLEEP);
                        acc_detector_presence_config_hwaas_set(presence_config, 8);
                        acc_detector_presence_config_sweeps_per_frame_set(presence_config, 8);
                        acc_detector_presence_config_frame_rate_set(presence_config, 0.7f);
                        acc_detector_presence_config_frame_rate_app_driven_set(presence_config, true);
                        acc_detector_presence_config_reset_filters_on_prepare_set(presence_config, true);
                        acc_detector_presence_config_intra_detection_set(presence_config, true);
                        acc_detector_presence_config_intra_detection_threshold_set(presence_config, 1.7f);
                        acc_detector_presence_config_intra_frame_time_const_set(presence_config, 0.3f);
                        acc_detector_presence_config_intra_output_time_const_set(presence_config, 0.3f);
                        acc_detector_presence_config_inter_detection_set(presence_config, true);
                        acc_detector_presence_config_inter_detection_threshold_set(presence_config, 1.2f);
                        acc_detector_presence_config_inter_frame_deviation_time_const_set(presence_config, 0.5f);
                        acc_detector_presence_config_inter_frame_fast_cutoff_set(presence_config, 5.0f);
                        acc_detector_presence_config_inter_frame_slow_cutoff_set(presence_config, 0.20f);
                        acc_detector_presence_config_inter_output_time_const_set(presence_config, 0.5f);
                        acc_detector_presence_config_inter_frame_presence_timeout_set(presence_config, 2);
 
                        break;
        }
}
 
static bool do_sensor_calibration(acc_sensor_t *sensor, acc_cal_result_t *cal_result, void *buffer, uint32_t buffer_size)
{
        bool           status              = false;
        bool           cal_complete        = false;
        const uint16_t calibration_retries = 1U;
 
        // Random disturbances may cause the calibration to fail. At failure, retry at least once.
        for (uint16_t i = 0; !status && (i <= calibration_retries); i++)
        {
                // Reset sensor before calibration by disabling/enabling it
                acc_hal_integration_sensor_disable(SENSOR_ID);
                acc_hal_integration_sensor_enable(SENSOR_ID);
 
                do
                {
                        status = acc_sensor_calibrate(sensor, &cal_complete, cal_result, buffer, buffer_size);
 
                        if (status && !cal_complete)
                        {
                                status = acc_hal_integration_wait_for_sensor_interrupt(SENSOR_ID, SENSOR_TIMEOUT_MS);
                        }
                } while (status && !cal_complete);
        }
 
        if (status)
        {
                /* Reset sensor after calibration by disabling/enabling it */
                acc_hal_integration_sensor_disable(SENSOR_ID);
                acc_hal_integration_sensor_enable(SENSOR_ID);
        }
 
        return status;
}
 
static void print_result(acc_detector_presence_result_t *result)
{
        if (result->presence_detected)
        {
                printf("Motion\n");
        }
        else
        {
                printf("No motion\n");
        }
 
        // Score and distance is multiplied by 1000 to avoid printing floats
        printf("Intra presence score: %d, Inter presence score: %d, Distance (mm): %d\n",
               (int)(result->intra_presence_score * 1000.0f),
               (int)(result->inter_presence_score * 1000.0f),
               (int)(result->presence_distance * 1000.0f));
}