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Assert in function nrfx_saadc_abort() in nRF5_SDK_15.3.0_59ac345

Dear Nordic Support,

I follow this SAADC example to calibrate the SAADC every SAADC_CALIBRATION_INTERVAL.

However, whenever the function nrfx_saadc_abort() is called, it always asserts at these lines of code: 

            // Wait for ADC being stopped.
            bool result;
            NRFX_WAIT_FOR((m_cb.adc_state == NRF_SAADC_STATE_IDLE), HW_TIMEOUT, 0, result);
            NRFX_ASSERT(result);
 

I tried debugging and I found that the m_cb.adc_state only in NRF_SAADC_STATE_IDLE after the initialization and then it is always busy.

I have 2 SAADC channels they are working with the PPI and TIMER. Every 10ms, the TIMER triggers the SAADC event. I am using nRF5_SDK_15.3.0_59ac345 with my nRF52840-DK.

For more details, I attached my code in following file: main.cperipherals.h and peripherals.c.

<error> app: ERROR 3735928559 [Unknown error code] at D:\Projects\torquevault_torquedevicesfw\torque_wrench\nRF5_SDK_15.3.0_59ac345\modules\nrfx\drivers\src\nrfx_saadc.c:594
PC at: 0x0002647F
<error> app: End of error report

Thank you and best regards,

            Duy

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 *
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 * 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.
 *
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 *    contributors may be used to endorse or promote products derived from this
 *    software without specific prior written permission.
 *
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 *    Nordic Semiconductor ASA integrated circuit.
 *
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 *
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 * DISCLAIMED. IN NO EVENT SHALL NORDIC SEMICONDUCTOR ASA OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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 * 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.
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 */
/** @file
 *
 * @defgroup ble_sdk_app_hts_main main.c
 * @{
 * @ingroup ble_sdk_app_hts
 * @brief Health Thermometer Service Sample Application main file.
 *
 * This file contains the source code for a sample application using the Health Thermometer service
 * It also includes the sample code for Battery and Device Information services.
 * This application uses the @ref srvlib_conn_params module.
 */

#include "main.h"


#define MIN_BATTERY_LEVEL               81                                          /**< Minimum battery level as returned by the simulated measurement function. */
#define MAX_BATTERY_LEVEL               100                                         /**< Maximum battery level as returned by the simulated measurement function. */
#define BATTERY_LEVEL_INCREMENT         1                                           /**< Value by which the battery level is incremented/decremented for each call to the simulated measurement function. */

#define TEMP_TYPE_AS_CHARACTERISTIC     0                                           /**< Determines if temperature type is given as characteristic (1) or as a field of measurement (0). */

#define MIN_CELCIUS_DEGREES             3688                                        /**< Minimum temperature in celcius for use in the simulated measurement function (multiplied by 100 to avoid floating point arithmetic). */
#define MAX_CELCIUS_DEGRESS             3972                                        /**< Maximum temperature in celcius for use in the simulated measurement function (multiplied by 100 to avoid floating point arithmetic). */
#define CELCIUS_DEGREES_INCREMENT       36                                          /**< Value by which temperature is incremented/decremented for each call to the simulated measurement function (multiplied by 100 to avoid floating point arithmetic). */


BLE_BAS_DEF(m_bas);                                                                 /**< Structure used to identify the battery service. */
BLE_HTS_DEF(m_hts);                                                                 /**< Structure used to identify the health thermometer service. */
NRF_BLE_GATT_DEF(m_gatt);                                                           /**< GATT module instance. */
NRF_BLE_QWR_DEF(m_qwr);                                                             /**< Context for the Queued Write module.*/
BLE_ADVERTISING_DEF(m_advertising);                                                 /**< Advertising module instance. */

static uint16_t          m_conn_handle = BLE_CONN_HANDLE_INVALID;                   /**< Handle of the current connection. */
static bool              m_hts_meas_ind_conf_pending = false;                       /**< Flag to keep track of when an indication confirmation is pending. */
static sensorsim_cfg_t   m_battery_sim_cfg;                                         /**< Battery Level sensor simulator configuration. */
static sensorsim_state_t m_battery_sim_state;                                       /**< Battery Level sensor simulator state. */
static sensorsim_cfg_t   m_temp_celcius_sim_cfg;                                    /**< Temperature simulator configuration. */
static sensorsim_state_t m_temp_celcius_sim_state;                                  /**< Temperature simulator state. */
static bool              m_device_connected = false;
static ble_uuid_t m_adv_uuids[] =                                                   /**< Universally unique service identifiers. */
{
    {BLE_UUID_HEALTH_THERMOMETER_SERVICE, BLE_UUID_TYPE_BLE},
    {BLE_UUID_BATTERY_SERVICE, BLE_UUID_TYPE_BLE},
    {BLE_UUID_DEVICE_INFORMATION_SERVICE, BLE_UUID_TYPE_BLE}
};


static bool		 m_device_first_start = true;


static void advertising_start(bool erase_bonds);
static void temperature_measurement_send(void);


/**@brief Callback function for asserts in the SoftDevice.
 *
 * @details This function will be called in case of an assert in the SoftDevice.
 *
 * @warning This handler is an example only and does not fit a final product. You need to analyze
 *          how your product is supposed to react in case of Assert.
 * @warning On assert from the SoftDevice, the system can only recover on reset.
 *
 * @param[in] line_num   Line number of the failing ASSERT call.
 * @param[in] file_name  File name of the failing ASSERT call.
 */
void assert_nrf_callback(uint16_t line_num, const uint8_t * p_file_name)
{
    app_error_handler(DEAD_BEEF, line_num, p_file_name);
}

/**@brief Function for handling Peer Manager events.
 *
 * @param[in] p_evt  Peer Manager event.
 */
static void pm_evt_handler(pm_evt_t const * p_evt)
{
    bool is_indication_enabled;

    pm_handler_on_pm_evt(p_evt);
    pm_handler_flash_clean(p_evt);

    switch (p_evt->evt_id)
    {
        case PM_EVT_CONN_SEC_SUCCEEDED:
            // Send a single temperature measurement if indication is enabled.
            // NOTE: For this to work, make sure ble_hts_on_ble_evt() is called before
            // pm_evt_handler() in ble_evt_dispatch().
            APP_ERROR_CHECK(ble_hts_is_indication_enabled(&m_hts, &is_indication_enabled));
            if (is_indication_enabled)
            {
                temperature_measurement_send();
            }
            break;

        case PM_EVT_PEERS_DELETE_SUCCEEDED:
            advertising_start(false);
            break;

        default:
            break;
    }
}


/**@brief Function for performing a battery measurement, and update the Battery Level characteristic in the Battery Service.
 */
static void battery_level_update(void)
{
    ret_code_t err_code;
    uint8_t  battery_level;

    battery_level = (uint8_t)sensorsim_measure(&m_battery_sim_state, &m_battery_sim_cfg);
  
    err_code = ble_bas_battery_level_update(&m_bas, battery_level, BLE_CONN_HANDLE_ALL);
    if ((err_code != NRF_SUCCESS) &&
        (err_code != NRF_ERROR_INVALID_STATE) &&
        (err_code != NRF_ERROR_RESOURCES) &&
        (err_code != NRF_ERROR_BUSY) &&
        (err_code != BLE_ERROR_GATTS_SYS_ATTR_MISSING)
       )
    {
        APP_ERROR_HANDLER(err_code);
    }
}


/**@brief Function for handling the Battery measurement timer timeout.
 *
 * @details This function will be called each time the battery level measurement timer expires.
 *
 * @param[in] p_context   Pointer used for passing some arbitrary information (context) from the
 *                        app_start_timer() call to the timeout handler.
 */
uint16_t counter;
static void saadc_acquisition_timeout_handler(nrf_timer_event_t event_type, void *p_context)
{
    switch (event_type)
    {
        case NRF_TIMER_EVENT_COMPARE0:
        {    
            counter++;
            if (m_conn_handle != BLE_CONN_HANDLE_INVALID)
            {

            }
            break;
        }

        default: break;
    }
}


/**@brief Function for handling the Battery measurement timer timeout.
 *
 * @details This function will be called each time the battery level measurement timer expires.
 *
 * @param[in] p_context   Pointer used for passing some arbitrary information (context) from the
 *                        app_start_timer() call to the timeout handler.
 */
uint16_t counter1;
static void battery_level_meas_timeout_handler(nrf_timer_event_t event_type, void *p_context)
{
    switch (event_type)
    {
        case NRF_TIMER_EVENT_COMPARE0:
        {    
            counter1++;
            if (m_conn_handle != BLE_CONN_HANDLE_INVALID)
            {
                temperature_measurement_send();
                battery_level_update();
            }
            break;
        }

        default: break;
    }
}


static void saadc_callback(nrf_drv_saadc_evt_t const *p_event)
{
    uint8_t idx;

    switch (p_event->type)
    {
	case NRF_DRV_SAADC_EVT_DONE:
	{
	    /* Evaluate if offset calibration should be performed. */
            /* Configure the SAADC_CALIBRATION_INTERVAL constant to change the calibration frequency. */
	    if (0 == (m_saadc_evt_counter % SAADC_CALIBRATION_INTERVAL))  
	    {	
//		if (true == m_device_first_start)
//		{
//		    m_device_first_start = false;
//		}
//		else
//		{
		  /* Abort all ongoing conversions. Calibration cannot be run if SAADC is busy. */
		  nrf_drv_saadc_abort();
							  
		  /* Set flag to trigger calibration in main context when SAADC is stopped. */
		  m_saadc_calibrate = true;		
//		}
	    }

            if (false == m_saadc_calibrate)
	    {
		APP_ERROR_CHECK(nrf_drv_saadc_buffer_convert(p_event->data.done.p_buffer, RAW_ADC_BUFF_SIZE));

                NRF_LOG_INFO("ADC channel %d event number: %d",p_event->data.limit.channel, (int)m_saadc_evt_counter);

                for (idx = 0; idx < RAW_ADC_BUFF_SIZE; idx++)
		{
		    NRF_LOG_INFO("%d", p_event->data.done.p_buffer[idx]);
		}
	    }

            m_saadc_evt_counter++;
	    break;
	}

        case NRF_DRV_SAADC_EVT_CALIBRATEDONE:
	{
	    /* Set buffer so the SAADC can write to it again. 
            Need to setup both buffers, as they were both removed 
	    with the call to nrf_drv_saadc_abort before calibration. */
	    saadc_set_buffer();
	    break;
	}

	default: break;
    }
}


/**@brief Function for populating simulated health thermometer measurement.
 */
static void hts_sim_measurement(ble_hts_meas_t * p_meas)
{
    static ble_date_time_t time_stamp = { 2012, 12, 5, 11, 50, 0 };

    uint32_t celciusX100;

    p_meas->temp_in_fahr_units = false;
    p_meas->time_stamp_present = true;
    p_meas->temp_type_present  = (TEMP_TYPE_AS_CHARACTERISTIC ? false : true);

    celciusX100 = sensorsim_measure(&m_temp_celcius_sim_state, &m_temp_celcius_sim_cfg);

    p_meas->temp_in_celcius.exponent = -2;
    p_meas->temp_in_celcius.mantissa = celciusX100;
    p_meas->temp_in_fahr.exponent    = -2;
    p_meas->temp_in_fahr.mantissa    = (32 * 100) + ((celciusX100 * 9) / 5);
    p_meas->time_stamp               = time_stamp;
    p_meas->temp_type                = BLE_HTS_TEMP_TYPE_FINGER;

    // update simulated time stamp
    time_stamp.seconds += 27;
    if (time_stamp.seconds > 59)
    {
        time_stamp.seconds -= 60;
        time_stamp.minutes++;
        if (time_stamp.minutes > 59)
        {
            time_stamp.minutes = 0;
        }
    }
}


/**@brief Function for the GAP initialization.
 *
 * @details This function sets up all the necessary GAP (Generic Access Profile) parameters of the
 *          device including the device name, appearance, and the preferred connection parameters.
 */
static void gap_params_init(void)
{
    ble_gap_conn_params_t   gap_conn_params;
    ble_gap_conn_sec_mode_t sec_mode;

    BLE_GAP_CONN_SEC_MODE_SET_OPEN(&sec_mode);

    APP_ERROR_CHECK(sd_ble_gap_device_name_set(&sec_mode, (const uint8_t *)DEVICE_NAME, strlen(DEVICE_NAME)));

    APP_ERROR_CHECK(sd_ble_gap_appearance_set(BLE_APPEARANCE_GENERIC_THERMOMETER));

    memset(&gap_conn_params, 0, sizeof(gap_conn_params));

    gap_conn_params.min_conn_interval = MIN_CONN_INTERVAL;
    gap_conn_params.max_conn_interval = MAX_CONN_INTERVAL;
    gap_conn_params.slave_latency     = SLAVE_LATENCY;
    gap_conn_params.conn_sup_timeout  = CONN_SUP_TIMEOUT;

    APP_ERROR_CHECK(sd_ble_gap_ppcp_set(&gap_conn_params));
}


/**@brief Function for initializing the GATT module.
 */
static void gatt_init(void)
{
    APP_ERROR_CHECK(nrf_ble_gatt_init(&m_gatt, NULL));
}


/**@brief Function for simulating and sending one Temperature Measurement.
 */
static void temperature_measurement_send(void)
{
    ble_hts_meas_t simulated_meas;
    ret_code_t     err_code;

    if (!m_hts_meas_ind_conf_pending)
    {
        hts_sim_measurement(&simulated_meas);

        err_code = ble_hts_measurement_send(&m_hts, &simulated_meas);

        switch (err_code)
        {
            case NRF_SUCCESS:
                // Measurement was successfully sent, wait for confirmation.
                m_hts_meas_ind_conf_pending = true;
                break;

            case NRF_ERROR_INVALID_STATE:
                // Ignore error.
                break;

            default:
                APP_ERROR_HANDLER(err_code);
                break;
        }
    }
}


/**@brief Function for handling the Health Thermometer Service events.
 *
 * @details This function will be called for all Health Thermometer Service events which are passed
 *          to the application.
 *
 * @param[in] p_hts  Health Thermometer Service structure.
 * @param[in] p_evt  Event received from the Health Thermometer Service.
 */
static void on_hts_evt(ble_hts_t * p_hts, ble_hts_evt_t * p_evt)
{
    switch (p_evt->evt_type)
    {
        case BLE_HTS_EVT_INDICATION_ENABLED:
            // Indication has been enabled, send a single temperature measurement
            temperature_measurement_send();
            break;

        case BLE_HTS_EVT_INDICATION_CONFIRMED:
            m_hts_meas_ind_conf_pending = false;
            break;

        default:
            // No implementation needed.
            break;
    }
}


/**@brief Function for handling Queued Write Module errors.
 *
 * @details A pointer to this function will be passed to each service which may need to inform the
 *          application about an error.
 *
 * @param[in]   nrf_error   Error code containing information about what went wrong.
 */
static void nrf_qwr_error_handler(uint32_t nrf_error)
{
    APP_ERROR_HANDLER(nrf_error);
}


/**@brief Function for initializing services that will be used by the application.
 *
 * @details Initialize the Health Thermometer, Battery and Device Information services.
 */
static void services_init(void)
{
    ret_code_t         err_code;
    ble_hts_init_t     hts_init;
    ble_bas_init_t     bas_init;
    ble_dis_init_t     dis_init;
    nrf_ble_qwr_init_t qwr_init = {0};
    ble_dis_sys_id_t   sys_id;

    // Initialize Queued Write Module.
    qwr_init.error_handler = nrf_qwr_error_handler;

    APP_ERROR_CHECK(nrf_ble_qwr_init(&m_qwr, &qwr_init));

    // Initialize Health Thermometer Service
    memset(&hts_init, 0, sizeof(hts_init));

    hts_init.evt_handler                 = on_hts_evt;
    hts_init.temp_type_as_characteristic = TEMP_TYPE_AS_CHARACTERISTIC;
    hts_init.temp_type                   = BLE_HTS_TEMP_TYPE_BODY;

    // Here the sec level for the Health Thermometer Service can be changed/increased.
    hts_init.ht_meas_cccd_wr_sec = SEC_JUST_WORKS;
    hts_init.ht_type_rd_sec      = SEC_OPEN;

    APP_ERROR_CHECK(ble_hts_init(&m_hts, &hts_init));

    // Initialize Battery Service.
    memset(&bas_init, 0, sizeof(bas_init));

    // Here the sec level for the Battery Service can be changed/increased.
    bas_init.bl_rd_sec        = SEC_OPEN;
    bas_init.bl_cccd_wr_sec   = SEC_OPEN;
    bas_init.bl_report_rd_sec = SEC_OPEN;

    bas_init.evt_handler          = NULL;
    bas_init.support_notification = true;
    bas_init.p_report_ref         = NULL;
    bas_init.initial_batt_level   = 100;

    APP_ERROR_CHECK(ble_bas_init(&m_bas, &bas_init));

    // Initialize Device Information Service.
    memset(&dis_init, 0, sizeof(dis_init));

    ble_srv_ascii_to_utf8(&dis_init.manufact_name_str, MANUFACTURER_NAME);
    ble_srv_ascii_to_utf8(&dis_init.model_num_str, MODEL_NUM);

    sys_id.manufacturer_id            = MANUFACTURER_ID;
    sys_id.organizationally_unique_id = ORG_UNIQUE_ID;
    dis_init.p_sys_id                 = &sys_id;

    dis_init.dis_char_rd_sec = SEC_OPEN;

    APP_ERROR_CHECK(ble_dis_init(&dis_init));
}


/**@brief Function for initializing the sensor simulators.
 */
static void sensor_simulator_init(void)
{
    m_battery_sim_cfg.min          = MIN_BATTERY_LEVEL;
    m_battery_sim_cfg.max          = MAX_BATTERY_LEVEL;
    m_battery_sim_cfg.incr         = BATTERY_LEVEL_INCREMENT;
    m_battery_sim_cfg.start_at_max = true;

    sensorsim_init(&m_battery_sim_state, &m_battery_sim_cfg);

    // Temperature is in celcius (it is multiplied by 100 to avoid floating point arithmetic).
    m_temp_celcius_sim_cfg.min          = MIN_CELCIUS_DEGREES;
    m_temp_celcius_sim_cfg.max          = MAX_CELCIUS_DEGRESS;
    m_temp_celcius_sim_cfg.incr         = CELCIUS_DEGREES_INCREMENT;
    m_temp_celcius_sim_cfg.start_at_max = false;

    sensorsim_init(&m_temp_celcius_sim_state, &m_temp_celcius_sim_cfg);
}


/**@brief Function for handling the Connection Parameters Module.
 *
 * @details This function will be called for all events in the Connection Parameters Module which
 *          are passed to the application.
 *          @note All this function does is to disconnect. This could have been done by simply
 *                setting the disconnect_on_fail config parameter, but instead we use the event
 *                handler mechanism to demonstrate its use.
 *
 * @param[in] p_evt  Event received from the Connection Parameters Module.
 */
static void on_conn_params_evt(ble_conn_params_evt_t * p_evt)
{
    if (p_evt->evt_type == BLE_CONN_PARAMS_EVT_FAILED)
    {
        APP_ERROR_CHECK(sd_ble_gap_disconnect(m_conn_handle, BLE_HCI_CONN_INTERVAL_UNACCEPTABLE));
    }
}


/**@brief Function for handling a Connection Parameters error.
 *
 * @param[in] nrf_error  Error code containing information about what went wrong.
 */
static void conn_params_error_handler(uint32_t nrf_error)
{
    APP_ERROR_HANDLER(nrf_error);
}


/**@brief Function for initializing the Connection Parameters module.
 */
static void conn_params_init(void)
{
    ble_conn_params_init_t cp_init;

    memset(&cp_init, 0, sizeof(cp_init));

    cp_init.p_conn_params                  = NULL;
    cp_init.first_conn_params_update_delay = FIRST_CONN_PARAMS_UPDATE_DELAY;
    cp_init.next_conn_params_update_delay  = NEXT_CONN_PARAMS_UPDATE_DELAY;
    cp_init.max_conn_params_update_count   = MAX_CONN_PARAMS_UPDATE_COUNT;
    cp_init.start_on_notify_cccd_handle    = BLE_GATT_HANDLE_INVALID;
    cp_init.disconnect_on_fail             = false;
    cp_init.evt_handler                    = on_conn_params_evt;
    cp_init.error_handler                  = conn_params_error_handler;

    APP_ERROR_CHECK(ble_conn_params_init(&cp_init));
}


/**@brief Function for putting the chip into sleep mode.
 *
 * @note This function will not return.
 */
static void sleep_mode_enter(void)
{
    APP_ERROR_CHECK(bsp_indication_set(BSP_INDICATE_IDLE));

    // Prepare wakeup buttons.
    APP_ERROR_CHECK(bsp_btn_ble_sleep_mode_prepare());

    // Go to system-off mode (this function will not return; wakeup will cause a reset).
    APP_ERROR_CHECK(sd_power_system_off());
}


/**@brief Function for handling advertising events.
 *
 * @details This function will be called for advertising events which are passed to the application.
 *
 * @param[in] ble_adv_evt  Advertising event.
 */
static void on_adv_evt(ble_adv_evt_t ble_adv_evt)
{
    switch (ble_adv_evt)
    {
        case BLE_ADV_EVT_FAST:
            NRF_LOG_INFO("Fast advertising.");
            APP_ERROR_CHECK(bsp_indication_set(BSP_INDICATE_ADVERTISING));
            break;

        case BLE_ADV_EVT_IDLE:
            sleep_mode_enter();
            break;

        default:
            break;
    }
}


/**@brief Function for handling BLE events.
 *
 * @param[in]   p_ble_evt   Bluetooth stack event.
 * @param[in]   p_context   Unused.
 */
static void ble_evt_handler(ble_evt_t const * p_ble_evt, void * p_context)
{
    switch (p_ble_evt->header.evt_id)
    {
        case BLE_GAP_EVT_CONNECTED:
            NRF_LOG_INFO("Connected.");
            APP_ERROR_CHECK(bsp_indication_set(BSP_INDICATE_CONNECTED));
            m_conn_handle = p_ble_evt->evt.gap_evt.conn_handle;
            APP_ERROR_CHECK(nrf_ble_qwr_conn_handle_assign(&m_qwr, m_conn_handle));
            m_device_connected = true;
            break;

        case BLE_GAP_EVT_DISCONNECTED:
            NRF_LOG_INFO("Disconnected.");
            m_conn_handle               = BLE_CONN_HANDLE_INVALID;
            m_hts_meas_ind_conf_pending = false;
            m_device_connected          = false;
            break;

        case BLE_GAP_EVT_PHY_UPDATE_REQUEST:
        {
            NRF_LOG_DEBUG("PHY update request.");
            ble_gap_phys_t const phys =
            {
                .rx_phys = BLE_GAP_PHY_AUTO,
                .tx_phys = BLE_GAP_PHY_AUTO,
            };
            APP_ERROR_CHECK(sd_ble_gap_phy_update(p_ble_evt->evt.gap_evt.conn_handle, &phys));
        } break;

        case BLE_GATTC_EVT_TIMEOUT:
            // Disconnect on GATT Client timeout event.
            NRF_LOG_DEBUG("GATT Client Timeout.");
            APP_ERROR_CHECK(sd_ble_gap_disconnect(p_ble_evt->evt.gattc_evt.conn_handle, BLE_HCI_REMOTE_USER_TERMINATED_CONNECTION));
            break;

        case BLE_GATTS_EVT_TIMEOUT:
            // Disconnect on GATT Server timeout event.
            NRF_LOG_DEBUG("GATT Server Timeout.");
            APP_ERROR_CHECK(sd_ble_gap_disconnect(p_ble_evt->evt.gatts_evt.conn_handle, BLE_HCI_REMOTE_USER_TERMINATED_CONNECTION));
            break;

        default:
            // No implementation needed.
            break;
    }
}


/**@brief Function for initializing the BLE stack.
 *
 * @details Initializes the SoftDevice and the BLE event interrupt.
 */
static void ble_stack_init(void)
{
    APP_ERROR_CHECK(nrf_sdh_enable_request());

    // Configure the BLE stack using the default settings.
    // Fetch the start address of the application RAM.
    uint32_t ram_start = 0;
    APP_ERROR_CHECK(nrf_sdh_ble_default_cfg_set(APP_BLE_CONN_CFG_TAG, &ram_start));

    // Enable BLE stack.
    APP_ERROR_CHECK(nrf_sdh_ble_enable(&ram_start));

    // Register a handler for BLE events.
    NRF_SDH_BLE_OBSERVER(m_ble_observer, APP_BLE_OBSERVER_PRIO, ble_evt_handler, NULL);
}


/**@brief Function for handling events from the BSP module.
 *
 * @param[in]   event   Event generated by button press.
 */
static void bsp_event_handler(bsp_event_t event)
{
    ret_code_t err_code;

    switch (event)
    {
        case BSP_EVENT_SLEEP:
            sleep_mode_enter();
            break;

        case BSP_EVENT_DISCONNECT:
            err_code = sd_ble_gap_disconnect(m_conn_handle, BLE_HCI_REMOTE_USER_TERMINATED_CONNECTION);
            if (err_code != NRF_ERROR_INVALID_STATE)
            {
                APP_ERROR_CHECK(err_code);
            }
            break;

        case BSP_EVENT_WHITELIST_OFF:
            if (m_conn_handle == BLE_CONN_HANDLE_INVALID)
            {
                err_code = ble_advertising_restart_without_whitelist(&m_advertising);
                if (err_code != NRF_ERROR_INVALID_STATE)
                {
                    APP_ERROR_CHECK(err_code);
                }
            }
            break;

        default:
            break;
    }
}


/**@brief Function for the Peer Manager initialization.
 */
static void peer_manager_init(void)
{
    ble_gap_sec_params_t sec_param;

    APP_ERROR_CHECK(pm_init());

    memset(&sec_param, 0, sizeof(ble_gap_sec_params_t));

    // Security parameters to be used for all security procedures.
    sec_param.bond           = SEC_PARAM_BOND;
    sec_param.mitm           = SEC_PARAM_MITM;
    sec_param.lesc           = SEC_PARAM_LESC;
    sec_param.keypress       = SEC_PARAM_KEYPRESS;
    sec_param.io_caps        = SEC_PARAM_IO_CAPABILITIES;
    sec_param.oob            = SEC_PARAM_OOB;
    sec_param.min_key_size   = SEC_PARAM_MIN_KEY_SIZE;
    sec_param.max_key_size   = SEC_PARAM_MAX_KEY_SIZE;
    sec_param.kdist_own.enc  = 1;
    sec_param.kdist_own.id   = 1;
    sec_param.kdist_peer.enc = 1;
    sec_param.kdist_peer.id  = 1;

    APP_ERROR_CHECK(pm_sec_params_set(&sec_param));

    APP_ERROR_CHECK(pm_register(pm_evt_handler));
}


/**@brief Clear bond information from persistent storage.
 */
static void delete_bonds(void)
{
    NRF_LOG_INFO("Erase bonds!");

    APP_ERROR_CHECK(pm_peers_delete());
}


/**@brief Function for initializing the Advertising functionality.
 *
 * @details Encodes the required advertising data and passes it to the stack.
 *          Also builds a structure to be passed to the stack when starting advertising.
 */
static void advertising_init(void)
{
    ble_advertising_init_t init;

    memset(&init, 0, sizeof(init));

    init.advdata.name_type               = BLE_ADVDATA_FULL_NAME;
    init.advdata.include_appearance      = true;
    init.advdata.flags                   = BLE_GAP_ADV_FLAGS_LE_ONLY_GENERAL_DISC_MODE;
    init.advdata.uuids_complete.uuid_cnt = sizeof(m_adv_uuids) / sizeof(m_adv_uuids[0]);
    init.advdata.uuids_complete.p_uuids  = m_adv_uuids;

    init.config.ble_adv_fast_enabled  = true;
    init.config.ble_adv_fast_interval = APP_ADV_INTERVAL;
    init.config.ble_adv_fast_timeout  = APP_ADV_DURATION;

    init.evt_handler = on_adv_evt;

    APP_ERROR_CHECK(ble_advertising_init(&m_advertising, &init));

    ble_advertising_conn_cfg_tag_set(&m_advertising, APP_BLE_CONN_CFG_TAG);
}


/**@brief Function for initializing buttons and leds.
 *
 * @param[out] p_erase_bonds  Will be true if the clear bonding button was pressed to wake the application up.
 */
static void buttons_leds_init(bool * p_erase_bonds)
{
    bsp_event_t startup_event;

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

    APP_ERROR_CHECK(bsp_btn_ble_init(NULL, &startup_event));

    *p_erase_bonds = (startup_event == BSP_EVENT_CLEAR_BONDING_DATA);
}


/**@brief Function for initializing the nrf log module.
 */
static void log_init(void)
{
    APP_ERROR_CHECK(NRF_LOG_INIT(NULL));

    NRF_LOG_DEFAULT_BACKENDS_INIT();
}


/**@brief Function for initializing power management.
 */
static void power_management_init(void)
{
    APP_ERROR_CHECK(nrf_pwr_mgmt_init());
}


/**@brief Function for handling the idle state (main loop).
 *
 * @details If there is no pending log operation, then sleep until next the next event occurs.
 */
static void idle_state_handle(void)
{
    if (NRF_LOG_PROCESS() == false)
    {
        nrf_pwr_mgmt_run();
    }
}


/**@brief Function for starting advertising.
 */
static void advertising_start(bool erase_bonds)
{
    if (erase_bonds == true)
    {
        delete_bonds();
        // Advertising is started by PM_EVT_PEERS_DELETE_SUCCEEDED event.
    }
    else
    {
        APP_ERROR_CHECK(ble_advertising_start(&m_advertising, BLE_ADV_MODE_FAST));
    }
}

#define SIZE  16
#define ADDR  0x0680
#define DATA  0x28

uint8_t read_data[SIZE], write_data[SIZE];
/**@brief Function for application main entry.
 */
int main(void)
{
    bool erase_bonds;

    memset(write_data, DATA, SIZE); 
    /* Initialize log. */
    log_init();   
    
    
    /* Initialize oled. */
    spi_init();
    oled_init();

    nrf_delay_ms(2000);

    /* Initialize eeprom. */
    twi_init();
    
    /* Read configured memory */
    EEPROM_WriteMemory(ADDR, write_data, SIZE);
    nrf_delay_ms(10);
    EEPROM_ReadMemory(ADDR, read_data, SIZE);

    timers_init(saadc_acquisition_timeout_handler, battery_level_meas_timeout_handler);
    buttons_leds_init(&erase_bonds);  
    power_management_init();
    ble_stack_init();
    gap_params_init();
    gatt_init();
    advertising_init();
    services_init();
    sensor_simulator_init();
    conn_params_init();
    peer_manager_init();

    /* Start execution. */
    advertising_start(erase_bonds);

    saadc_init(saadc_callback);
    saadc_sampling_event_init();
    saadc_sampling_event_enable();

    NRF_LOG_INFO("Software started.");

    /* Enter main loop. */
    for (;;)
    {
	saadc_wait_calibration();
	ssd1309_SetCursor(0, 0);
	ssd1309_WriteString("Testing 1 2 3!", Font_7x10, White);
        ssd1309_UpdateScreen();
	NRF_LOG_FLUSH();
        idle_state_handle();
    }
}


/**
 * @}
 */
#include "peripherals.h"

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

#include "TT_Config.h"


/* DEFINES */
#define SAADC_TIMER_INSTANCE    1
#define EEPROM_TWI_INSTANCE     1
#define OLED_SPI_INSTANCE       0

/* TIMER instances */
static const nrf_drv_timer_t SAADC_TIMER = NRF_DRV_TIMER_INSTANCE(SAADC_TIMER_INSTANCE);          /**< ADC timer. */
static const nrf_drv_timer_t BATTERY_TIMER = NRF_DRV_TIMER_INSTANCE(2);                           /**< Battery timer. */

/* PPI instances */
static nrf_ppi_channel_t SAADC_TIMER_PPI_CHANNEL;

/* TWI instances */
const nrf_drv_twi_t m_eeprom_twi = NRF_DRV_TWI_INSTANCE(EEPROM_TWI_INSTANCE);

/* SPI instances */
const nrf_drv_spi_t m_oled_spi   = NRF_DRV_SPI_INSTANCE(OLED_SPI_INSTANCE);

static nrf_saadc_value_t m_buffer_pool[2][RAW_ADC_BUFF_SIZE];

uint32_t m_saadc_evt_counter;					    
bool     m_saadc_calibrate  = false;				    /**< SAADC internal calibration trigger flag */

void saadc_set_buffer(void)
{
    APP_ERROR_CHECK(nrf_drv_saadc_buffer_convert(m_buffer_pool[0], RAW_ADC_BUFF_SIZE));
    APP_ERROR_CHECK(nrf_drv_saadc_buffer_convert(m_buffer_pool[1], RAW_ADC_BUFF_SIZE));
}

void saadc_init(nrf_drv_saadc_event_handler_t battery_event_handler)
{
    nrf_saadc_channel_config_t adc_channel_config = NRF_DRV_SAADC_DEFAULT_CHANNEL_CONFIG_SE(NRF_SAADC_INPUT_AIN1);
    nrf_saadc_channel_config_t battery_channel_config = NRF_DRV_SAADC_DEFAULT_CHANNEL_CONFIG_SE(NRF_SAADC_INPUT_AIN2);

    m_saadc_calibrate = false;

    APP_ERROR_CHECK(nrf_drv_saadc_init(NULL, battery_event_handler));

    APP_ERROR_CHECK(nrf_drv_saadc_channel_init(0, &adc_channel_config));
    APP_ERROR_CHECK(nrf_drv_saadc_channel_init(1, &battery_channel_config));

    APP_ERROR_CHECK(nrf_drv_saadc_buffer_convert(m_buffer_pool[0], RAW_ADC_BUFF_SIZE));
    APP_ERROR_CHECK(nrf_drv_saadc_buffer_convert(m_buffer_pool[1], RAW_ADC_BUFF_SIZE));
}


/**
 * @brief TWI initialization.
 */
void twi_init(void)
{
    const nrf_drv_twi_config_t twi_config = {
       .scl                = ARDUINO_SCL_PIN,
       .sda                = ARDUINO_SDA_PIN,
       .frequency          = NRF_DRV_TWI_FREQ_100K,
       .interrupt_priority = APP_IRQ_PRIORITY_HIGH,
       .clear_bus_init     = true
    };

#if TWI_USE_INTERRUPT
    APP_ERROR_CHECK(nrf_drv_twi_init(&m_eeprom_twi, &twi_config, eeprom_callback, NULL));
#else
    APP_ERROR_CHECK(nrf_drv_twi_init(&m_eeprom_twi, &twi_config, NULL, NULL));
#endif
    nrf_drv_twi_enable(&m_eeprom_twi);
}


/**
 * @brief SPI initialization.
 */
void spi_init(void)
{
    nrf_drv_spi_config_t spi_config = NRF_DRV_SPI_DEFAULT_CONFIG;
    spi_config.ss_pin   = ARDUINO_10_PIN;
//    spi_config.miso_pin = ARDUINO_12_PIN;
    spi_config.mosi_pin = ARDUINO_11_PIN;
    spi_config.sck_pin  = ARDUINO_13_PIN;

#if SPI_USE_INTERRUPT
    APP_ERROR_CHECK(nrf_drv_spi_init(&m_oled_spi, &spi_config, oled_spi_callback, NULL));
#else
    APP_ERROR_CHECK(nrf_drv_spi_init(&m_oled_spi, &spi_config, NULL, NULL));
#endif      
}


/**@brief Function for the Timer initialization.
 *
 * @details Initializes the timer module. This creates and starts application timers.
 */
void timers_init(nrfx_timer_event_handler_t saadc_timer, nrfx_timer_event_handler_t battery_timer_handler)
{
    nrf_drv_timer_config_t timer_cfg = NRF_DRV_TIMER_DEFAULT_CONFIG;

    /* Enable app timer */
    APP_ERROR_CHECK(app_timer_init());

    /* Create ADC timer */
    APP_ERROR_CHECK(nrf_drv_timer_init(&SAADC_TIMER, &timer_cfg, saadc_timer));
    nrf_drv_timer_extended_compare(&SAADC_TIMER, NRF_TIMER_CC_CHANNEL0, nrf_drv_timer_ms_to_ticks(&SAADC_TIMER, ADC_ACQUISITION_INTERVAL), NRF_TIMER_SHORT_COMPARE0_CLEAR_MASK, true);

    /* Configure BATTERY TIMER */
    APP_ERROR_CHECK(nrf_drv_timer_init(&BATTERY_TIMER, &timer_cfg, battery_timer_handler));
    nrf_drv_timer_extended_compare(&BATTERY_TIMER, NRF_TIMER_CC_CHANNEL0, nrf_drv_timer_ms_to_ticks(&BATTERY_TIMER, BATTERY_LEVEL_MEAS_INTERVAL), NRF_TIMER_SHORT_COMPARE0_CLEAR_MASK, true);
}


void saadc_sampling_event_init(void)
{
    uint32_t transducer_timer_compare_event_addr, battery_timer_compare_event_addr;
    uint32_t saadc_sample_task_addr;

    APP_ERROR_CHECK(nrf_drv_ppi_init());

    nrf_drv_timer_enable(&SAADC_TIMER);
    nrf_drv_timer_enable(&BATTERY_TIMER);

    transducer_timer_compare_event_addr = nrf_drv_timer_compare_event_address_get(&SAADC_TIMER, NRF_TIMER_CC_CHANNEL0);
    
    saadc_sample_task_addr = nrf_drv_saadc_sample_task_get();
    /* Setup ppi channel so that timer compare event is triggering sample tasks in SAADC */
    APP_ERROR_CHECK(nrf_drv_ppi_channel_alloc(&SAADC_TIMER_PPI_CHANNEL));

    APP_ERROR_CHECK(nrf_drv_ppi_channel_assign(SAADC_TIMER_PPI_CHANNEL, transducer_timer_compare_event_addr, saadc_sample_task_addr));
}


void saadc_sampling_event_enable(void)
{
    APP_ERROR_CHECK(nrf_drv_ppi_channel_enable(SAADC_TIMER_PPI_CHANNEL));
}

void saadc_wait_calibration(void)
{
    if (true == m_saadc_calibrate)
    {
	NRF_LOG_INFO("SAADC calibration starting...  \r\n");

	/* Trigger calibration task */
        while (NRF_SUCCESS != nrf_drv_saadc_calibrate_offset())
	{
	    
	}

        m_saadc_calibrate = false;
    }
}
5428.peripherals.h

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