CAF and sensor_manager

[Tiit]

Hi

Is there some example, how to use CAF and sensor_manager. I try to use BME680 sensor with CAF, but i'm somehow stuck. I got the sensor manager working and I see sensor events, but I can't figure out how to read data from the sensor events. 

Thanks..

Tiit

[Jared]

Hi,

There is available documentation here. I couldn't find any example that used the library, but maybe you can start with sharing your code?

regards

Jared 

[Tiit]

Actually I try to create battery powered sensor device with CAF and first try to get some understand about the archidecture.

I created config file for sensor_manager:

#include <caf/sensor_manager.h>

#include "math.h"

static const struct sm_sampled_channel temp_ch[] = {

        {

                .chan = SENSOR_CHAN_AMBIENT_TEMP,

                .data_cnt = 1,

        },

};

static const struct sm_sampled_channel hum_ch[] = {

        {

                .chan = SENSOR_CHAN_HUMIDITY,

                .data_cnt = 1,

        },

};

static const struct sm_sampled_channel press_ch[] = {

        {

                .chan = SENSOR_CHAN_PRESS,

                .data_cnt = 1,

        },

};

static const struct sm_sensor_config sensor_configs[] = {

        {

                .dev_name = "BME680",

                .event_descr = "bme_temp",

                .chans = temp_ch,

                .chan_cnt = ARRAY_SIZE(temp_ch),

                .sampling_period_ms = 5000,

                .active_events_limit = 1,

        },

        {

                .dev_name = "BME680",

                .event_descr = "bme_hum",

                .chans = hum_ch,

                .chan_cnt = ARRAY_SIZE(hum_ch),

                .sampling_period_ms = 5000,

                .active_events_limit = 1,

        },

        {

                .dev_name = "BME680",

                .event_descr = "bme_press",

                .chans = temp_ch,

                .chan_cnt = ARRAY_SIZE(press_ch),

                .sampling_period_ms = 5000,

                .active_events_limit = 1,

        },

};

 and then a module for event data management:

/*

 * Copyright (c) 2021 Nordic Semiconductor ASA

 *

 * SPDX-License-Identifier: LicenseRef-Nordic-5-Clause

 */

#include <zephyr.h>

#include <stdio.h>

#define MODULE bme680_sensor

#include <caf/events/module_state_event.h>

#include <caf/events/sensor_event.h>

#include <logging/log.h>

LOG_MODULE_REGISTER(MODULE, CONFIG_CAF_BME680_SENSOR_LOG_LEVEL);

float temp, hum, press;

static bool event_handler(const struct event_header *eh)

{

    if (is_sensor_event(eh)) {

       

        struct sensor_event *event = cast_sensor_event(eh);

        float * sensor_data = sensor_event_get_data_ptr(event);

           

    }

   

    if (is_module_state_event(eh)) {

        //const struct module_state_event *event = cast_module_state_event(eh);

        return false;

    }

   

    /* Event not handled but subscribed. */

    __ASSERT_NO_MSG(false);

    return false;

}

EVENT_LISTENER(MODULE, event_handler);

EVENT_SUBSCRIBE(MODULE, module_state_event);

EVENT_SUBSCRIBE(MODULE, sensor_event);

Is that the right way to configure sensor and get data? I should get sensor data pointer from sensor_event_get_data_ptr(event) then?

 

Sorry .. but I'm still very noob in Zephyr.

Tiit

[Tiit]

I got the values from sensor and I think I got it working.