ANT+ sd_ant_channel_close reseting

[roar]

Hi,

We are using nrf52832 for ANT and BLE for which we use SDK_17.0.2 and s332_nrf52_7.0.1

Our objective is to pair and un-pair ANT sensors. So far pairing multiple ANT sensors and snding the data via BLE works fine. But when we do try to un-pair sensors by closing the channel, the device does restarts.

For that we did try to use sd_ant_channel_close() function. We did use it in our event and in main while loop with a dalay as well. We did try with sd_ant_channel_unassign() function after closing the channel as well.

Is there some sequence that we are missing? Below is our channel init code. Thank you.

static void ANT_profile_HRM_setup(uint8_t ant_channel_no, uint32_t ant_device_no)
{
/** @snippet [ANT HRM RX Profile Setup] */
       
    uint32_t err_code = sd_ant_lib_config_set(ANT_LIB_CONFIG_MESG_OUT_INC_DEVICE_ID);
    APP_ERROR_CHECK(err_code);

        ant_channel_config_t channel_config =
    {
        .channel_number     = ant_channel_no,
        .channel_type       = CHANNEL_TYPE_SLAVE,
        .ext_assign         = HRM_EXT_ASSIGN,
        .rf_freq            = HRM_ANTPLUS_RF_FREQ,
        .transmission_type  = CHAN_ID_TRANS_TYPE,
        .device_type        = HRM_DEVICE_TYPE,
        .device_number      = ant_device_no,
        .channel_period     = HRM_MSG_PERIOD_1Hz,
        .network_number     = ANTPLUS_NETWORK_NUM,
    };

    const ant_search_config_t ant_search_config =
    {
        .channel_number        = ant_channel_no,
        .low_priority_timeout  = ANT_LOW_PRIORITY_TIMEOUT_DISABLE,
        .high_priority_timeout = ANT_HIGH_PRIORITY_SEARCH_DISABLE,
        .search_sharing_cycles = ANT_SEARCH_SHARING_CYCLES_DISABLE,
        .search_priority       = ANT_SEARCH_PRIORITY_DEFAULT,
        .waveform              = ANT_WAVEFORM_DEFAULT,
    };


    err_code = ant_hrm_disp_init(&m_ant_hrm, &channel_config, ant_tmp_evt_handler);
    APP_ERROR_CHECK(err_code);

        // Set search timeout
        err_code = ant_search_init(&ant_search_config);
        APP_ERROR_CHECK(err_code);

    err_code = sd_ant_channel_open(ant_channel_no);
    APP_ERROR_CHECK(err_code);


    err_code = ant_state_indicator_channel_opened();
    APP_ERROR_CHECK(err_code);

/** @snippet [ANT HRM RX Profile Setup] */
}

Best regards, Ram

[roar]

Hi Kenneth,

yes of course. I am attaching(it is in HRM RX example):

- complete SDK with example

(nRF5_SDK_17.0.2_d674dde\examples\ant\ant_plus\ant_hrm\hrm_rx\pca10040\s212\ses)

- ony main.c, ant_hrm.c, ant_hrm.h

(\examples\ant\ant_plus\ant_hrm\hrm_rx          \components\ant\ant_profiles\ant_hrm)

Fullscreen 254155.main.c Download

/**
 * This software is subject to the ANT+ Shared Source License
 * www.thisisant.com/swlicenses
 * Copyright (c) Garmin Canada Inc. 2012
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or
 * without modification, are permitted provided that the following
 * conditions are met:
 *
 *    1) Redistributions of source code must retain the above
 *       copyright notice, this list of conditions and the following
 *       disclaimer.
 *
 *    2) Redistributions in binary form must reproduce the above
 *       copyright notice, this list of conditions and the following
 *       disclaimer in the documentation and/or other materials
 *       provided with the distribution.
 *
 *    3) Neither the name of Garmin nor the names of its
 *       contributors may be used to endorse or promote products
 *       derived from this software without specific prior
 *       written permission.
 *
 * The following actions are prohibited:
 *
 *    1) Redistribution of source code containing the ANT+ Network
 *       Key. The ANT+ Network Key is available to ANT+ Adopters.
 *       Please refer to http://thisisant.com to become an ANT+
 *       Adopter and access the key. 
 *
 *    2) Reverse engineering, decompilation, and/or disassembly of
 *       software provided in binary form under this license.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
 * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE HEREBY
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES(INCLUDING, 
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 
 * SERVICES; DAMAGE TO ANY DEVICE, LOSS OF USE, DATA, OR 
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 
 * OF THE POSSIBILITY OF SUCH DAMAGE. SOME STATES DO NOT ALLOW 
 * THE EXCLUSION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES, SO THE
 * ABOVE LIMITATIONS MAY NOT APPLY TO YOU.
 *
 */
/**@file
 * @defgroup ant_hrm_rx_example ANT HRM RX example
 * @{
 * @ingroup nrf_ant_hrm
 *
 * @brief Example of ANT HRM RX profile.
 *
 * Before compiling this example for NRF52, complete the following steps:
 * - Download the S212 SoftDevice from <a href="https://www.thisisant.com/developer/components/nrf52832" target="_blank">thisisant.com</a>.
 * - Extract the downloaded zip file and copy the S212 SoftDevice headers to <tt>\<InstallFolder\>/components/softdevice/s212/headers</tt>.
 * If you are using Keil packs, copy the files into a @c headers folder in your example folder.
 * - Make sure that @ref ANT_LICENSE_KEY in @c nrf_sdm.h is uncommented.
 */

#include <stdio.h>
#include "nrf.h"
#include "bsp.h"
#include "hardfault.h"
#include "app_error.h"
#include "app_timer.h"
#include "nrf_pwr_mgmt.h"
#include "nrf_sdh.h"
#include "nrf_sdh_ant.h"
#include "ant_key_manager.h"
#include "ant_hrm.h"
#include "bsp_btn_ant.h"
#include "ant_state_indicator.h"

#include "nrf_log.h"
#include "nrf_log_ctrl.h"
#include "nrf_log_default_backends.h"

//!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

// There are 7 lines added or commented out, in main.c #1-#5, in ant_hrm.c #6 and ant_hrm.h #7 they are all marked with #x 

//!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

//#include "nrf_delay.h"
//#include "ant_hrm.h"
//#include "ant_interface.h"
uint32_t counter_1 = 0;     //!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! #1
char channel_flag_1 = 0;    //!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! #2

/** @snippet [ANT HRM RX Instance] */
HRM_DISP_CHANNEL_CONFIG_DEF(m_ant_hrm,
                            HRM_CHANNEL_NUM,
                            CHAN_ID_TRANS_TYPE,
                            CHAN_ID_DEV_NUM,
                            ANTPLUS_NETWORK_NUM,
                            HRM_MSG_PERIOD_4Hz);

static ant_hrm_profile_t m_ant_hrm;
/** @snippet [ANT HRM RX Instance] */


NRF_SDH_ANT_OBSERVER(m_ant_observer, ANT_HRM_ANT_OBSERVER_PRIO,
                     ant_hrm_disp_evt_handler, &m_ant_hrm);

static void ant_hrm_evt_handler(ant_hrm_profile_t * p_profile, ant_hrm_evt_t event)
{
    nrf_pwr_mgmt_feed();

    switch (event)
    {
        case ANT_HRM_PAGE_0_UPDATED:
            /* fall through */
        case ANT_HRM_PAGE_1_UPDATED:
            /* fall through */
        case ANT_HRM_PAGE_2_UPDATED:
            /* fall through */
        case ANT_HRM_PAGE_3_UPDATED:
            /* fall through */
        case ANT_HRM_PAGE_4_UPDATED:
            NRF_LOG_INFO("Page was updated");
            break;

        default:
            break;
    }
}

/**@brief Function for handling events from the BSP module.
 *
 * @param[in]   event   Event generated by BSP.
 */
void bsp_event_handler(bsp_event_t event)
{
    switch (event)
    {
        case BSP_EVENT_SLEEP:
            nrf_pwr_mgmt_shutdown(NRF_PWR_MGMT_SHUTDOWN_GOTO_SYSOFF);
            break;

        default:
            break;
    }
}

/**
 * @brief Function for shutdown events.
 *
 * @param[in]   event       Shutdown type.
 */
static bool shutdown_handler(nrf_pwr_mgmt_evt_t event)
{
    ret_code_t err_code;

    switch (event)
    {
        case NRF_PWR_MGMT_EVT_PREPARE_WAKEUP:
            err_code = bsp_btn_ant_sleep_mode_prepare();
            APP_ERROR_CHECK(err_code);
            break;

        default:
            break;
    }

    return true;
}

NRF_PWR_MGMT_HANDLER_REGISTER(shutdown_handler, APP_SHUTDOWN_HANDLER_PRIORITY);

/**@brief Function for the Timer and BSP initialization.
 */
static void utils_setup(void)
{
    ret_code_t err_code = app_timer_init();
    APP_ERROR_CHECK(err_code);

    err_code = bsp_init(BSP_INIT_LEDS | BSP_INIT_BUTTONS,
                        bsp_event_handler);
    APP_ERROR_CHECK(err_code);

    err_code = nrf_pwr_mgmt_init();
    APP_ERROR_CHECK(err_code);

    err_code = bsp_btn_ant_init(m_ant_hrm.channel_number, HRM_DISP_CHANNEL_TYPE);
    APP_ERROR_CHECK(err_code);

    err_code = ant_state_indicator_init(m_ant_hrm.channel_number, HRM_DISP_CHANNEL_TYPE);
    APP_ERROR_CHECK(err_code);
}

/**@brief Function for ANT stack initialization.
 *
 * @details Initializes the SoftDevice and the ANT event interrupt.
 */
static void softdevice_setup(void)
{
    ret_code_t err_code = nrf_sdh_enable_request();
    APP_ERROR_CHECK(err_code);

    ASSERT(nrf_sdh_is_enabled());

    err_code = nrf_sdh_ant_enable();
    APP_ERROR_CHECK(err_code);

    err_code = ant_plus_key_set(ANTPLUS_NETWORK_NUM);
    APP_ERROR_CHECK(err_code);
}

/**@brief Function for HRM profile initialization.
 *
 * @details Initializes the HRM profile and open ANT channel.
 */
static void profile_setup(void)
{
/** @snippet [ANT HRM RX Profile Setup] */
    ret_code_t err_code =
        ant_hrm_disp_init(&m_ant_hrm, HRM_DISP_CHANNEL_CONFIG(m_ant_hrm), ant_hrm_evt_handler);
    APP_ERROR_CHECK(err_code);

    err_code = ant_hrm_disp_open(&m_ant_hrm);
    APP_ERROR_CHECK(err_code);

    err_code = ant_state_indicator_channel_opened();
    APP_ERROR_CHECK(err_code);
/** @snippet [ANT HRM RX Profile Setup] */
}

/**
 *@brief Function for initializing logging.
 */
static void log_init(void)
{
    ret_code_t err_code = NRF_LOG_INIT(NULL);
    APP_ERROR_CHECK(err_code);

    NRF_LOG_DEFAULT_BACKENDS_INIT();
}

/**@brief Function for application main entry, does not return.
 */
int main(void)
{
    log_init();
    utils_setup();
    softdevice_setup();
    profile_setup();

    NRF_LOG_INFO("ANT+ Heart Rate RX example started.");

    for (;;)
    {

        if ( channel_flag_1 == 0)       //!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! #3
        {
            ant_close_channel();
//            sd_ant_channel_close(HRM_CHANNEL_NUM);
            channel_flag_1 = 1;
        }

        counter_1++;                  //!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! #4

//        NRF_LOG_FLUSH();            //!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! #5 (commented out)
//        nrf_pwr_mgmt_run();
    }
}


/**
 *@}
 **/

Fullscreen ant_hrm.c Download

/**
 * Copyright (c) 2015 - 2020, Nordic Semiconductor ASA
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this
 *    list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form, except as embedded into a Nordic
 *    Semiconductor ASA integrated circuit in a product or a software update for
 *    such product, must reproduce the above copyright notice, this list of
 *    conditions and the following disclaimer in the documentation and/or other
 *    materials provided with the distribution.
 *
 * 3. Neither the name of Nordic Semiconductor ASA nor the names of its
 *    contributors may be used to endorse or promote products derived from this
 *    software without specific prior written permission.
 *
 * 4. This software, with or without modification, must only be used with a
 *    Nordic Semiconductor ASA integrated circuit.
 *
 * 5. Any software provided in binary form under this license must not be reverse
 *    engineered, decompiled, modified and/or disassembled.
 *
 * THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS
 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL NORDIC SEMICONDUCTOR ASA OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */
#include "sdk_config.h"
#if ANT_HRM_ENABLED

#include "nrf_assert.h"
#include "app_error.h"
#include "ant_interface.h"
#include "app_util.h"
#include "ant_hrm.h"
#include "ant_hrm_utils.h"
#include "app_error.h"

#define NRF_LOG_MODULE_NAME ant_hrm
#if ANT_HRM_LOG_ENABLED
#define NRF_LOG_LEVEL       ANT_HRM_LOG_LEVEL
#define NRF_LOG_INFO_COLOR  ANT_HRM_INFO_COLOR
#else // ANT_HRM_LOG_ENABLED
#define NRF_LOG_LEVEL       0
#endif // ANT_HRM_LOG_ENABLED
#include "nrf_log.h"
NRF_LOG_MODULE_REGISTER();

#define BACKGROUND_DATA_INTERVAL 64 /**< The number of main data pages sent between background data page.
                                         Background data page is sent every 65th message. */
#define TX_TOGGLE_DIVISOR        4  /**< The number of messages between changing state of toggle bit. */

/**@brief HRM message data layout structure. */
typedef struct
{
    ant_hrm_page_t page_number         : 7;
    uint8_t        toggle_bit          : 1;
    uint8_t        page_payload[7];
} ant_hrm_message_layout_t;

/**@brief Function for initializing the ANT HRM profile instance.
 *
 * @param[in]  p_profile        Pointer to the profile instance.
 * @param[in]  p_channel_config Pointer to the ANT channel configuration structure.
 *
 * @retval     NRF_SUCCESS      If initialization was successful. Otherwise, an error code is returned.
 */
static ret_code_t ant_hrm_init(ant_hrm_profile_t          * p_profile,
                             ant_channel_config_t const * p_channel_config)
{
    p_profile->channel_number = p_channel_config->channel_number;

    p_profile->page_0 = DEFAULT_ANT_HRM_PAGE0();
    p_profile->page_1 = DEFAULT_ANT_HRM_PAGE1();
    p_profile->page_2 = DEFAULT_ANT_HRM_PAGE2();
    p_profile->page_3 = DEFAULT_ANT_HRM_PAGE3();
    p_profile->page_4 = DEFAULT_ANT_HRM_PAGE4();

    NRF_LOG_INFO("ANT HRM channel %u init", p_profile->channel_number);
    return ant_channel_init(p_channel_config);
}


ret_code_t ant_hrm_disp_init(ant_hrm_profile_t          * p_profile,
                           ant_channel_config_t const * p_channel_config,
                           ant_hrm_evt_handler_t        evt_handler)
{
    ASSERT(p_profile != NULL);
    ASSERT(p_channel_config != NULL);
    ASSERT(evt_handler != NULL);

    p_profile->evt_handler = evt_handler;

    return ant_hrm_init(p_profile, p_channel_config);
}


ret_code_t ant_hrm_sens_init(ant_hrm_profile_t           * p_profile,
                           ant_channel_config_t const  * p_channel_config,
                           ant_hrm_sens_config_t const * p_sens_config)
{
    ASSERT(p_profile != NULL);
    ASSERT(p_channel_config != NULL);
    ASSERT(p_sens_config != NULL);
    ASSERT(p_sens_config->p_cb != NULL);
    ASSERT(p_sens_config->evt_handler != NULL);

    ASSERT((p_sens_config->main_page_number == ANT_HRM_PAGE_0)
           || (p_sens_config->main_page_number == ANT_HRM_PAGE_4));

    p_profile->evt_handler       = p_sens_config->evt_handler;
    p_profile->_cb.p_sens_cb     = p_sens_config->p_cb;

    ant_hrm_sens_cb_t * p_hrm_cb = p_profile->_cb.p_sens_cb;
    p_hrm_cb->page_1_present     = p_sens_config->page_1_present;
    p_hrm_cb->main_page_number   = p_sens_config->main_page_number;
    p_hrm_cb->ext_page_number    = p_hrm_cb->page_1_present ? ANT_HRM_PAGE_1 : ANT_HRM_PAGE_2;
    p_hrm_cb->message_counter    = 0;
    p_hrm_cb->toggle_bit         = true;

    return ant_hrm_init(p_profile, p_channel_config);
}


/**@brief Function for getting next page number to send.
 *
 * @param[in]  p_profile        Pointer to the profile instance.
 *
 * @return     Next page number.
 */
static ant_hrm_page_t next_page_number_get(ant_hrm_profile_t * p_profile)
{
    ant_hrm_sens_cb_t * p_hrm_cb = p_profile->_cb.p_sens_cb;
    ant_hrm_page_t      page_number;

    if (p_hrm_cb->message_counter == (BACKGROUND_DATA_INTERVAL))
    {
        page_number = p_hrm_cb->ext_page_number;

        p_hrm_cb->message_counter = 0;

        p_hrm_cb->ext_page_number++;

        if (p_hrm_cb->ext_page_number > ANT_HRM_PAGE_3)
        {
            p_hrm_cb->ext_page_number = p_hrm_cb->page_1_present ? ANT_HRM_PAGE_1 : ANT_HRM_PAGE_2;
        }
    }
    else
    {
        page_number = p_hrm_cb->main_page_number;
    }

    if (p_hrm_cb->message_counter % TX_TOGGLE_DIVISOR == 0)
    {
        p_hrm_cb->toggle_bit ^= 1;
    }

    p_hrm_cb->message_counter++;

    return page_number;
}


/**@brief Function for encoding HRM message.
 *
 * @note Assume to be call each time when Tx window will occur.
 */
static void sens_message_encode(ant_hrm_profile_t * p_profile, uint8_t * p_message_payload)
{
    ant_hrm_message_layout_t * p_hrm_message_payload =
        (ant_hrm_message_layout_t *)p_message_payload;
    ant_hrm_sens_cb_t * p_hrm_cb = p_profile->_cb.p_sens_cb;

    p_hrm_message_payload->page_number = next_page_number_get(p_profile);
    p_hrm_message_payload->toggle_bit  = p_hrm_cb->toggle_bit;

    NRF_LOG_INFO("HRM TX Page number: %u", p_hrm_message_payload->page_number);

    ant_hrm_page_0_encode(p_hrm_message_payload->page_payload, &(p_profile->page_0)); // Page 0 is present in each message

    switch (p_hrm_message_payload->page_number)
    {
        case ANT_HRM_PAGE_0:
            // No implementation needed
            break;

        case ANT_HRM_PAGE_1:
            ant_hrm_page_1_encode(p_hrm_message_payload->page_payload, &(p_profile->page_1));
            break;

        case ANT_HRM_PAGE_2:
            ant_hrm_page_2_encode(p_hrm_message_payload->page_payload, &(p_profile->page_2));
            break;

        case ANT_HRM_PAGE_3:
            ant_hrm_page_3_encode(p_hrm_message_payload->page_payload, &(p_profile->page_3));
            break;

        case ANT_HRM_PAGE_4:
            ant_hrm_page_4_encode(p_hrm_message_payload->page_payload, &(p_profile->page_4));
            break;

        default:
            return;
    }

    p_profile->evt_handler(p_profile, (ant_hrm_evt_t)p_hrm_message_payload->page_number);
}


/**@brief Function for setting payload for ANT message and sending it.
 *
 * @param[in]  p_profile        Pointer to the profile instance.
 */
static void ant_message_send(ant_hrm_profile_t * p_profile)
{
    uint32_t err_code;
    uint8_t  p_message_payload[ANT_STANDARD_DATA_PAYLOAD_SIZE];

    sens_message_encode(p_profile, p_message_payload);
    err_code =
        sd_ant_broadcast_message_tx(p_profile->channel_number,
                                    sizeof (p_message_payload),
                                    p_message_payload);
    APP_ERROR_CHECK(err_code);
}


void ant_hrm_sens_evt_handler(ant_evt_t * p_ant_evt, void * p_context)
{
    ant_hrm_profile_t * p_profile = (ant_hrm_profile_t *)p_context;
    if (p_ant_evt->channel == p_profile->channel_number)
    {
        switch (p_ant_evt->event)
        {
            case EVENT_TX:
                ant_message_send(p_profile);
                break;

            default:
                break;
        }
    }
}


ret_code_t ant_hrm_disp_open(ant_hrm_profile_t * p_profile)
{
    ASSERT(p_profile != NULL);

    NRF_LOG_INFO("ANT HRM channel %u open", p_profile->channel_number);
    return sd_ant_channel_open(p_profile->channel_number);
}


ret_code_t ant_hrm_sens_open(ant_hrm_profile_t * p_profile)
{
    ASSERT(p_profile != NULL);

    // Fill tx buffer for the first frame
    ant_message_send(p_profile);

    NRF_LOG_INFO("ANT HRM channel %u open", p_profile->channel_number);
    return sd_ant_channel_open(p_profile->channel_number);
}


/**@brief Function for decoding HRM message.
 *
 * @note Assume to be call each time when Rx window will occur.
 */
static void disp_message_decode(ant_hrm_profile_t * p_profile, uint8_t * p_message_payload)
{
    const ant_hrm_message_layout_t * p_hrm_message_payload =
        (ant_hrm_message_layout_t *)p_message_payload;

    NRF_LOG_INFO("HRM RX Page Number: %u", p_hrm_message_payload->page_number);

    ant_hrm_page_0_decode(p_hrm_message_payload->page_payload, &(p_profile->page_0)); // Page 0 is present in each message

    switch (p_hrm_message_payload->page_number)
    {
        case ANT_HRM_PAGE_0:
            // No implementation needed
            break;

        case ANT_HRM_PAGE_1:
            ant_hrm_page_1_decode(p_hrm_message_payload->page_payload, &(p_profile->page_1));
            break;

        case ANT_HRM_PAGE_2:
            ant_hrm_page_2_decode(p_hrm_message_payload->page_payload, &(p_profile->page_2));
            break;

        case ANT_HRM_PAGE_3:
            ant_hrm_page_3_decode(p_hrm_message_payload->page_payload, &(p_profile->page_3));
            break;

        case ANT_HRM_PAGE_4:
            ant_hrm_page_4_decode(p_hrm_message_payload->page_payload, &(p_profile->page_4));
            break;

        default:
            return;
    }

    p_profile->evt_handler(p_profile, (ant_hrm_evt_t)p_hrm_message_payload->page_number);
}


void ant_hrm_disp_evt_handler(ant_evt_t * p_ant_evt, void * p_context)
{
    ant_hrm_profile_t * p_profile = ( ant_hrm_profile_t *)p_context;
    if (p_ant_evt->channel == p_profile->channel_number)
    {
        switch (p_ant_evt->event)
        {
            case EVENT_RX:
                if (p_ant_evt->message.ANT_MESSAGE_ucMesgID == MESG_BROADCAST_DATA_ID
                 || p_ant_evt->message.ANT_MESSAGE_ucMesgID == MESG_ACKNOWLEDGED_DATA_ID
                 || p_ant_evt->message.ANT_MESSAGE_ucMesgID == MESG_BURST_DATA_ID)
                {
                    disp_message_decode(p_profile, p_ant_evt->message.ANT_MESSAGE_aucPayload);
                }
                break;

            default:
                break;
        }
    }
}

void ant_close_channel(void)        //!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! #6
{
    sd_ant_channel_close(HRM_CHANNEL_NUM);
}


#endif // ANT_HRM_ENABLED

ant_hrm.h

[roar]

I couldn't upload whole SDK, So here is a link to my Dropbox:

www.dropbox.com/.../nRF5_SDK_17.0.2_d674dde.rar

[Kenneth]

It seems to run fine here, what do you expect should happen if I run the HRM RX example project with your additional ant_close_channel()?

[roar]

In a debug mode.

It does stop because of some error. Please have a look at the video, 1. with ant_channel_close() counter stops and in video 2. when comentig out that function it counts normaly.

[Kenneth]

I believe this is because when the channel is closed it will go to system OFF mode, see ant_evt_handler() in ant_state_indicator.c where the switch case EVENT_CHANNEL_CLOSED will call nrf_pwr_mgmt_shutdown(NRF_PWR_MGMT_SHUTDOWN_GOTO_SYSOFF);

Edit: Please comment out this line if you don't want to go to system OFF.

Kenneth