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How to implement CODED_PHY in ble_app_uart in SDK 15.3.0

I am working long nrf52840 and trying to implement long range in my project. There were examples in SDK 15.2.0 but i couldn't find any example or post which is related to SDK 15.3.0. I tried my own modification like changing the advertising layer from 1 Mbps to CODED in ble_adverstisement.c file(15.3.0) but after i made the changes my device keep resetting. I did not make any other changes in sdk_config and main. file

p_advertising->adv_params.secondary_phy   = BLE_GAP_PHY_CODED;
this line i added in ble_advertisement_init() function. i don't more what changes need to be done to make it work in coded mode.

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  • i have attached the main.c file and copy of ble_advertisng.c where i made changes for coded mode testing.is there any changes need to be done in sdk_config.h also?

    // ble_advertising.c 
    
    #define BLE_APP_UART_CODED_ENABLED 1
    
    uint32_t ble_advertising_init(ble_advertising_t            * const p_advertising,
                                  ble_advertising_init_t const * const p_init)
    {
        uint32_t ret;
        if ((p_init == NULL) || (p_advertising == NULL))
        {
            return NRF_ERROR_NULL;
        }
        if (!config_is_valid(&p_init->config))
        {
            return NRF_ERROR_INVALID_PARAM;
        }
        p_advertising->adv_mode_current               = BLE_ADV_MODE_FAST;
        p_advertising->adv_modes_config               = p_init->config;
        p_advertising->conn_cfg_tag                   = BLE_CONN_CFG_TAG_DEFAULT;
        p_advertising->evt_handler                    = p_init->evt_handler;
        p_advertising->error_handler                  = p_init->error_handler;
        p_advertising->current_slave_link_conn_handle = BLE_CONN_HANDLE_INVALID;
        p_advertising->p_adv_data                     = &p_advertising->adv_data;
        //p_advertising->adv_modes_config.ble_adv_extended_enabled = true;
    
        memset(&p_advertising->peer_address, 0, sizeof(p_advertising->peer_address));
    
        // Copy advertising data.
        if (!p_advertising->initialized)
        {
            p_advertising->adv_handle = BLE_GAP_ADV_SET_HANDLE_NOT_SET;
        }
        p_advertising->adv_data.adv_data.p_data = p_advertising->enc_advdata;
    
        if (p_advertising->adv_modes_config.ble_adv_extended_enabled == true)
        {
    #ifdef BLE_GAP_ADV_SET_DATA_SIZE_EXTENDED_CONNECTABLE_MAX_SUPPORTED
            p_advertising->adv_data.adv_data.len = BLE_GAP_ADV_SET_DATA_SIZE_EXTENDED_CONNECTABLE_MAX_SUPPORTED;
    #else
        p_advertising->adv_data.adv_data.len = BLE_GAP_ADV_SET_DATA_SIZE_MAX;
    #endif // BLE_GAP_ADV_SET_DATA_SIZE_EXTENDED_CONNECTABLE_MAX_SUPPORTED
        }
        else
        {
            p_advertising->adv_data.adv_data.len = BLE_GAP_ADV_SET_DATA_SIZE_MAX;
        }
    
        ret = ble_advdata_encode(&p_init->advdata, p_advertising->enc_advdata, &p_advertising->adv_data.adv_data.len);
        VERIFY_SUCCESS(ret);
    
        p_advertising->adv_data.scan_rsp_data.p_data = p_advertising->enc_scan_rsp_data;
        if (p_advertising->adv_modes_config.ble_adv_extended_enabled == true)
        {
    #ifdef BLE_GAP_ADV_SET_DATA_SIZE_EXTENDED_CONNECTABLE_MAX_SUPPORTED
            p_advertising->adv_data.scan_rsp_data.len = BLE_GAP_ADV_SET_DATA_SIZE_EXTENDED_CONNECTABLE_MAX_SUPPORTED;
    #else
            p_advertising->adv_data.scan_rsp_data.len = BLE_GAP_ADV_SET_DATA_SIZE_MAX;
    #endif // BLE_GAP_ADV_SET_DATA_SIZE_EXTENDED_CONNECTABLE_MAX_SUPPORTED
        }
        else
        {
            p_advertising->adv_data.scan_rsp_data.len = BLE_GAP_ADV_SET_DATA_SIZE_MAX;
        }
        ret = ble_advdata_encode(&p_init->srdata,
                                  p_advertising->adv_data.scan_rsp_data.p_data,
                                 &p_advertising->adv_data.scan_rsp_data.len);
        VERIFY_SUCCESS(ret);
    
        // Configure a initial advertising configuration. The advertising data and and advertising
        // parameters will be changed later when we call @ref ble_advertising_start, but must be set
        // to legal values here to define an advertising handle.
        p_advertising->adv_params.primary_phy     = BLE_GAP_PHY_1MBPS;
        #ifdef BLE_APP_UART_CODED
        p_advertising->adv_params.primary_phy     = BLE_GAP_PHY_CODED;
        p_advertising->adv_params.secondary_phy   = BLE_GAP_PHY_CODED;
        #endif
        p_advertising->adv_params.duration        = p_advertising->adv_modes_config.ble_adv_fast_timeout;
        p_advertising->adv_params.properties.type = BLE_GAP_ADV_TYPE_NONCONNECTABLE_SCANNABLE_UNDIRECTED;
        #ifdef BLE_APP_UART_CODED
        p_advertising->adv_params.properties.type = BLE_GAP_ADV_TYPE_EXTENDED_NONCONNECTABLE_SCANNABLE_UNDIRECTED;
        #endif
        p_advertising->adv_params.p_peer_addr     = NULL;
        p_advertising->adv_params.filter_policy   = BLE_GAP_ADV_FP_ANY;
        p_advertising->adv_params.interval        = p_advertising->adv_modes_config.ble_adv_fast_interval;
    
        ret = sd_ble_gap_adv_set_configure(&p_advertising->adv_handle, &p_advertising->adv_data, &p_advertising->adv_params);
        VERIFY_SUCCESS(ret);
    
        p_advertising->initialized = true;
        return ret;
    }
    
    uint32_t ble_advertising_start(ble_advertising_t * const p_advertising,
                                   ble_adv_mode_t            advertising_mode)
    {
        uint32_t ret;
    
        if (p_advertising->initialized == false)
        {
            return NRF_ERROR_INVALID_STATE;
        }
    
        p_advertising->adv_mode_current = advertising_mode;
    
        memset(&p_advertising->peer_address, 0, sizeof(p_advertising->peer_address));
    
        if (  ((p_advertising->adv_modes_config.ble_adv_directed_high_duty_enabled) && (p_advertising->adv_mode_current == BLE_ADV_MODE_DIRECTED_HIGH_DUTY))
            ||((p_advertising->adv_modes_config.ble_adv_directed_enabled)           && (p_advertising->adv_mode_current == BLE_ADV_MODE_DIRECTED_HIGH_DUTY))
            ||((p_advertising->adv_modes_config.ble_adv_directed_enabled)           && (p_advertising->adv_mode_current == BLE_ADV_MODE_DIRECTED))
           )
        {
            if (p_advertising->evt_handler != NULL)
            {
                p_advertising->peer_addr_reply_expected = true;
                p_advertising->evt_handler(BLE_ADV_EVT_PEER_ADDR_REQUEST);
            }
            else
            {
                p_advertising->peer_addr_reply_expected = false;
            }
        }
    
        p_advertising->adv_mode_current = adv_mode_next_avail_get(p_advertising, advertising_mode);
    
        // Fetch the whitelist.
        if ((p_advertising->evt_handler != NULL) &&
            (p_advertising->adv_mode_current == BLE_ADV_MODE_FAST || p_advertising->adv_mode_current == BLE_ADV_MODE_SLOW) &&
            (p_advertising->adv_modes_config.ble_adv_whitelist_enabled) &&
            (!p_advertising->whitelist_temporarily_disabled))
        {
            p_advertising->whitelist_in_use         = false;
            p_advertising->whitelist_reply_expected = true;
            p_advertising->evt_handler(BLE_ADV_EVT_WHITELIST_REQUEST);
        }
        else
        {
            p_advertising->whitelist_reply_expected = false;
        }
    
        // Initialize advertising parameters with default values.
        memset(&p_advertising->adv_params, 0, sizeof(p_advertising->adv_params));
        p_advertising->adv_params.properties.type = BLE_GAP_ADV_TYPE_NONCONNECTABLE_SCANNABLE_UNDIRECTED;
        #ifdef BLE_APP_UART_CODED
        p_advertising->adv_params.properties.type = BLE_GAP_ADV_TYPE_EXTENDED_NONCONNECTABLE_SCANNABLE_UNDIRECTED;
        #endif
    
        // Use 1MBIT as primary phy if no phy was selected.
        if (phy_is_valid(&p_advertising->adv_modes_config.ble_adv_primary_phy))
        {
            p_advertising->adv_params.primary_phy = p_advertising->adv_modes_config.ble_adv_primary_phy;
     
        }
        else
        {
            p_advertising->adv_params.primary_phy = BLE_GAP_PHY_1MBPS;
            #ifdef BLE_APP_UART_CODED
            p_advertising->adv_params.primary_phy = BLE_GAP_PHY_CODED;
            #endif
    
        }
    
        if (p_advertising->adv_modes_config.ble_adv_extended_enabled)
        {
            // Use 1MBIT as secondary phy if no phy was selected.
            if (phy_is_valid(&p_advertising->adv_modes_config.ble_adv_primary_phy))
            {
                p_advertising->adv_params.secondary_phy = p_advertising->adv_modes_config.ble_adv_secondary_phy;
    
            }
            else
            {
                p_advertising->adv_params.secondary_phy = BLE_GAP_PHY_1MBPS;
                #ifdef BLE_APP_UART_CODED
                p_advertising->adv_params.secondary_phy = BLE_GAP_PHY_CODED;
                #endif
            }
        }
         p_advertising->adv_params.filter_policy = BLE_GAP_ADV_FP_ANY;
    
        // Set advertising parameters and events according to selected advertising mode.
        switch (p_advertising->adv_mode_current)
        {
            case BLE_ADV_MODE_DIRECTED_HIGH_DUTY:
                ret = set_adv_mode_directed_high_duty(p_advertising, &p_advertising->adv_params);
                break;
    
            case BLE_ADV_MODE_DIRECTED:
                ret = set_adv_mode_directed(p_advertising, &p_advertising->adv_params);
                break;
    
            case BLE_ADV_MODE_FAST:
                ret = set_adv_mode_fast(p_advertising, &p_advertising->adv_params);
                break;
    
            case BLE_ADV_MODE_SLOW:
                ret = set_adv_mode_slow(p_advertising, &p_advertising->adv_params);
                break;
    
            case BLE_ADV_MODE_IDLE:
                p_advertising->adv_evt = BLE_ADV_EVT_IDLE;
                break;
    
            default:
                break;
        }
    
        if (p_advertising->adv_mode_current != BLE_ADV_MODE_IDLE)
        {
            //#ifndef BLE_APP_UART_CODED
            uint8_t *p_data_test = p_advertising->p_adv_data->adv_data.p_data;
            for(int d=0;d<31;d++){
            printf("\n value %d = %X",d,*p_data_test);
            p_data_test++;
            nrf_delay_ms(10);
            }
            ret = sd_ble_gap_adv_set_configure(&p_advertising->adv_handle, &p_advertising->adv_data, &p_advertising->adv_params);
            if (ret != NRF_SUCCESS)
            {
                return ret;
            }
            //#endif
            ret = sd_ble_gap_adv_start(p_advertising->adv_handle, p_advertising->conn_cfg_tag);
    
            if (ret != NRF_SUCCESS)
            {
                return ret;
            }
        }
    
        if (p_advertising->evt_handler != NULL)
        {
            p_advertising->evt_handler(p_advertising->adv_evt);
        }
    
        return NRF_SUCCESS;
    }
    
    /**
     * Copyright (c) 2014 - 2019, 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.
     *
     */
    /** @file
     *
     * @defgroup ble_sdk_uart_over_ble_main main.c
     * @{
     * @ingroup  ble_sdk_app_nus_eval
     * @brief    UART over BLE application main file.
     *
     * This file contains the source code for a sample application that uses the Nordic UART service.
     * This application uses the @ref srvlib_conn_params module.
     */
    
    
    #include <stdint.h>
    #include <string.h>
    #include "nordic_common.h"
    #include "nrf.h"
    #include "ble_hci.h"
    #include "ble_advdata.h"
    #include "ble_advertising.h"
    #include "ble_conn_params.h"
    #include "nrf_sdh.h"
    #include "nrf_sdh_soc.h"
    #include "nrf_sdh_ble.h"
    #include "nrf_ble_gatt.h"
    #include "nrf_ble_qwr.h"
    #include "app_timer.h"
    #include "ble_nus.h"
    #include "app_uart.h"
    #include "app_util_platform.h"
    #include "bsp_btn_ble.h"
    #include "nrf_drv_clock.h"
    #include "nrf_delay.h"
    #include "nrf_pwr_mgmt.h"
    #include "boards.h"
    #include "nrf_drv_twi.h"
    #include "app_error.h"
    
    #if defined (UART_PRESENT)
    #include "nrf_uart.h"
    #endif
    #if defined (UARTE_PRESENT)
    #include "nrf_uarte.h"
    #endif
    
    #include "nrf_log.h"
    #include "nrf_log_ctrl.h"
    #include "nrf_log_default_backends.h"
    
    /* TWI instance ID. */
    #define TWI_INSTANCE_ID     0
    
    
    #define APP_BLE_CONN_CFG_TAG            1                                           /**< A tag identifying the SoftDevice BLE configuration. */
    
    #define DEVICE_NAME                     "Nordic_UART_TEST"                               /**< Name of device. Will be included in the advertising data. */
    #define NUS_SERVICE_UUID_TYPE           BLE_UUID_TYPE_BLE // changed for testing 4/30/19                  /**< UUID type for the Nordic UART Service (vendor specific). */
    
    #define APP_BLE_OBSERVER_PRIO           3                                           /**< Application's BLE observer priority. You shouldn't need to modify this value. */
    
    #define APP_ADV_INTERVAL                500                                         /**< The advertising interval (in units of 0.625 ms. This value corresponds to 40 ms). */
    
    #define APP_ADV_DURATION                100                                       /**< The advertising duration (180 seconds) in units of 10 milliseconds. */
    #define MIN_CONN_INTERVAL               MSEC_TO_UNITS(20, UNIT_1_25_MS)             /**< Minimum acceptable connection interval (20 ms), Connection interval uses 1.25 ms units. */
    #define MAX_CONN_INTERVAL               MSEC_TO_UNITS(75, UNIT_1_25_MS)             /**< Maximum acceptable connection interval (75 ms), Connection interval uses 1.25 ms units. */
    #define SLAVE_LATENCY                   0                                           /**< Slave latency. */
    #define CONN_SUP_TIMEOUT                MSEC_TO_UNITS(4000, UNIT_10_MS)             /**< Connection supervisory timeout (4 seconds), Supervision Timeout uses 10 ms units. */
    #define FIRST_CONN_PARAMS_UPDATE_DELAY  APP_TIMER_TICKS(5000)                       /**< Time from initiating event (connect or start of notification) to first time sd_ble_gap_conn_param_update is called (5 seconds). */
    #define NEXT_CONN_PARAMS_UPDATE_DELAY   APP_TIMER_TICKS(30000)                      /**< Time between each call to sd_ble_gap_conn_param_update after the first call (30 seconds). */
    #define MAX_CONN_PARAMS_UPDATE_COUNT    3                                           /**< Number of attempts before giving up the connection parameter negotiation. */
    
    #define DEAD_BEEF                       0xDEADBEEF                                  /**< Value used as error code on stack dump, can be used to identify stack location on stack unwind. */
    
    #define UART_TX_BUF_SIZE                256                                         /**< UART TX buffer size. */
    #define UART_RX_BUF_SIZE                256                                         /**< UART RX buffer size. */
    
    APP_TIMER_DEF(m_repeated_timer_id); 
    APP_TIMER_DEF(m_repeated_timer_id_1);    
    BLE_NUS_DEF(m_nus, NRF_SDH_BLE_TOTAL_LINK_COUNT);                                   /**< BLE NUS service instance. */
    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 void advertising_start();
    static void advertising_init(void);
    
    
    static uint16_t   m_conn_handle          = BLE_CONN_HANDLE_INVALID;                 /**< Handle of the current connection. */
    static uint16_t   m_ble_nus_max_data_len = BLE_GATT_ATT_MTU_DEFAULT - 3;            /**< Maximum length of data (in bytes) that can be transmitted to the peer by the Nordic UART service module. */
    static ble_uuid_t m_adv_uuids[]          =                                          /**< Universally unique service identifier. */
    {
        {BLE_UUID_NUS_SERVICE, NUS_SERVICE_UUID_TYPE} // BLE_UUID_NUS_SERVICE changed from 0x0001 to 0x0008
    };
    
    /* Indicates if operation on TWI has ended. */
    static volatile bool m_xfer_done = false;
    static void ardu_slave(void);
    static uint32_t counter;
    
    /* TWI instance. */
    static const nrf_drv_twi_t m_twi = NRF_DRV_TWI_INSTANCE(TWI_INSTANCE_ID);
    
    /* Buffer for samples read from temperature sensor. */
    static uint8_t m_sample;
    static volatile char reg[5];
    
    /**@brief Function for assert macro callback.
     *
     * @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 analyse
     *          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] p_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);
    }
    
    static void repeated_timer_handler(void * p_context)
    {
        /*nrf_gpio_pin_clear(16);
        nrf_delay_ms(300);
        nrf_gpio_pin_set(16);*/
        //ardu_slave(); // un comment to get i2c data from the slave by sending request
        counter++;
        advertising_init();
        advertising_start();
    
    }
    
    static void create_timers()
    {
        ret_code_t err_code;
    
        // Create timers
        err_code = app_timer_create(&m_repeated_timer_id_1,
                                    APP_TIMER_MODE_REPEATED,
                                    repeated_timer_handler);
        APP_ERROR_CHECK(err_code);
    }
    
    /**@brief Function for initializing the timer module.
     */
    static void timers_init(void)
    {
        ret_code_t err_code = app_timer_init();
        APP_ERROR_CHECK(err_code);
    }
    
    __STATIC_INLINE void data_handler(char temp[])
    {
        char* data=temp;
        printf("\n data_handler : ");
        for(int i=0;i<5;i++)
        {
          printf("%c",*data);
          data++;
        }
      
    }
    
    void twi_handler(nrf_drv_twi_evt_t const * p_event, void * p_context)
    {
        switch (p_event->type)
        {
            case NRF_DRV_TWI_EVT_DONE:
                if (p_event->xfer_desc.type == NRF_DRV_TWI_XFER_RX)
                {
                    data_handler(reg);
                    m_xfer_done = true;
                }
                break;
            default:
                break;
        }
    }
    
    void twi_init (void)
    {
        ret_code_t err_code;
    
        const nrf_drv_twi_config_t twi_lm75b_config = {
           .scl                = ARDUINO_SCL_PIN,
           .sda                = ARDUINO_SDA_PIN,
           .frequency          = NRF_DRV_TWI_FREQ_100K,
           .interrupt_priority = APP_IRQ_PRIORITY_HIGH,
           .clear_bus_init     = false
        };
    
        err_code = nrf_drv_twi_init(&m_twi, &twi_lm75b_config, twi_handler, NULL);
        APP_ERROR_CHECK(err_code);
    
        nrf_drv_twi_enable(&m_twi);
    }
    
    static void ardu_slave(void)
    {
      ret_code_t err_code;
      for(int i=0;i<5;i++)
      {
        reg[i] = '\0';
      }
      err_code = nrf_drv_twi_rx(&m_twi,0x02,&reg,sizeof(reg)); // 0x02 i2c slave address of arduino
      while(m_xfer_done == false);
      m_xfer_done= false;
      if(err_code == NRF_SUCCESS)
      {
        NRF_LOG_INFO("READ SUCCESS");
      }
      printf("\n received bytes %c%c%c%c%c",reg[0],reg[1],reg[2],reg[3],reg[4]);
      NRF_LOG_FLUSH();
    }
    
    /**
     * @brief Function for reading data from temperature sensor.
     */
    
    
    static void lfclk_config(void)
    {
        ret_code_t err_code = nrf_drv_clock_init();
        APP_ERROR_CHECK(err_code);
    
        nrf_drv_clock_lfclk_request(NULL);
    }
    
    /**@brief Function for the GAP initialization.
     *
     * @details This function will set up all the necessary GAP (Generic Access Profile) parameters of
     *          the device. It also sets the permissions and appearance.
     */
    static void gap_params_init(void)
    {
        uint32_t                err_code;
        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);
    
        err_code = sd_ble_gap_device_name_set(&sec_mode,
                                              (const uint8_t *) DEVICE_NAME,
                                              strlen(DEVICE_NAME));
        APP_ERROR_CHECK(err_code);
    
        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;
    
        err_code = sd_ble_gap_ppcp_set(&gap_conn_params);
        APP_ERROR_CHECK(err_code);
    }
    
    
    /**@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 handling the data from the Nordic UART Service.
     *
     * @details This function will process the data received from the Nordic UART BLE Service and send
     *          it to the UART module.
     *
     * @param[in] p_evt       Nordic UART Service event.
     */
    /**@snippet [Handling the data received over BLE] */
    static void nus_data_handler(ble_nus_evt_t * p_evt)
    {
    
        if (p_evt->type == BLE_NUS_EVT_RX_DATA)
        {
            uint32_t err_code;
    
            NRF_LOG_DEBUG("Received data from BLE NUS. Writing data on UART.");
            NRF_LOG_HEXDUMP_DEBUG(p_evt->params.rx_data.p_data, p_evt->params.rx_data.length);
    
            for (uint32_t i = 0; i < p_evt->params.rx_data.length; i++)
            {
                do
                {
                    err_code = app_uart_put(p_evt->params.rx_data.p_data[i]);
                    if ((err_code != NRF_SUCCESS) && (err_code != NRF_ERROR_BUSY))
                    {
                        NRF_LOG_ERROR("Failed receiving NUS message. Error 0x%x. ", err_code);
                        APP_ERROR_CHECK(err_code);
                    }
                } while (err_code == NRF_ERROR_BUSY);
            }
            if (p_evt->params.rx_data.p_data[p_evt->params.rx_data.length - 1] == '\r')
            {
                while (app_uart_put('\n') == NRF_ERROR_BUSY);
            }
        }
    
    }
    /**@snippet [Handling the data received over BLE] */
    
    
    /**@brief Function for initializing services that will be used by the application.
     */
    static void services_init(void)
    {
        uint32_t           err_code;
        ble_nus_init_t     nus_init;
        nrf_ble_qwr_init_t qwr_init = {0};
    
        // Initialize Queued Write Module.
        qwr_init.error_handler = nrf_qwr_error_handler;
    
        err_code = nrf_ble_qwr_init(&m_qwr, &qwr_init);
        APP_ERROR_CHECK(err_code);
    
        // Initialize NUS.
        memset(&nus_init, 0, sizeof(nus_init));
    
        nus_init.data_handler = nus_data_handler;
    
        err_code = ble_nus_init(&m_nus, &nus_init);
        APP_ERROR_CHECK(err_code);
    }
    
    
    /**@brief Function for handling an event from 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)
    {
        uint32_t err_code;
    
        if (p_evt->evt_type == BLE_CONN_PARAMS_EVT_FAILED)
        {
            err_code = sd_ble_gap_disconnect(m_conn_handle, BLE_HCI_CONN_INTERVAL_UNACCEPTABLE);
            APP_ERROR_CHECK(err_code);
        }
    }
    
    
    /**@brief Function for handling errors from the Connection Parameters module.
     *
     * @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)
    {
        uint32_t               err_code;
        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;
    
        err_code = ble_conn_params_init(&cp_init);
        APP_ERROR_CHECK(err_code);
    }
    
    
    /**@brief Function for putting the chip into sleep mode.
     *
     * @note This function will not return.
     */
    static void sleep_mode_enter(void)
    {
        nrf_delay_ms(500);
        uint32_t err_code = bsp_indication_set(BSP_INDICATE_IDLE);
        APP_ERROR_CHECK(err_code);
        //disabled_uart();
    
        // Prepare wakeup buttons.
        /*err_code = bsp_btn_ble_sleep_mode_prepare();
        APP_ERROR_CHECK(err_code);*/
    
        // Go to system-off mode (this function will not return; wakeup will cause a reset).
        /*err_code = sd_power_system_off();
        APP_ERROR_CHECK(err_code);*/
       //sd_app_evt_wait();
        //TO disable UART peripheral
       /* *(volatile uint32_t *)0x40002FFC = 0;
        *(volatile uint32_t *)0x40002FFC;
        *(volatile uint32_t *)0x40002FFC = 1;*/
    }
    
    
    /**@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)
    {
        uint32_t err_code;
    
        switch (ble_adv_evt)
        {
            case BLE_ADV_EVT_FAST:
                err_code = bsp_indication_set(BSP_INDICATE_ADVERTISING);
                APP_ERROR_CHECK(err_code);
                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)
    {
        uint32_t err_code;
    
        switch (p_ble_evt->header.evt_id)
        {
            case BLE_GAP_EVT_CONNECTED:
                NRF_LOG_INFO("Connected");
                err_code = bsp_indication_set(BSP_INDICATE_CONNECTED);
                APP_ERROR_CHECK(err_code);
                m_conn_handle = p_ble_evt->evt.gap_evt.conn_handle;
                err_code = nrf_ble_qwr_conn_handle_assign(&m_qwr, m_conn_handle);
                APP_ERROR_CHECK(err_code);
                break;
    
            case BLE_GAP_EVT_DISCONNECTED:
                NRF_LOG_INFO("Disconnected");
                // LED indication will be changed when advertising starts.
                m_conn_handle = BLE_CONN_HANDLE_INVALID;
                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,
                };
                err_code = sd_ble_gap_phy_update(p_ble_evt->evt.gap_evt.conn_handle, &phys);
                APP_ERROR_CHECK(err_code);
            } break;
    
            case BLE_GAP_EVT_SEC_PARAMS_REQUEST:
                // Pairing not supported
                err_code = sd_ble_gap_sec_params_reply(m_conn_handle, BLE_GAP_SEC_STATUS_PAIRING_NOT_SUPP, NULL, NULL);
                APP_ERROR_CHECK(err_code);
                break;
    
            case BLE_GATTS_EVT_SYS_ATTR_MISSING:
                // No system attributes have been stored.
                err_code = sd_ble_gatts_sys_attr_set(m_conn_handle, NULL, 0, 0);
                APP_ERROR_CHECK(err_code);
                break;
    
            case BLE_GATTC_EVT_TIMEOUT:
                // Disconnect on GATT Client timeout event.
                err_code = sd_ble_gap_disconnect(p_ble_evt->evt.gattc_evt.conn_handle,
                                                 BLE_HCI_REMOTE_USER_TERMINATED_CONNECTION);
                APP_ERROR_CHECK(err_code);
                break;
    
            case BLE_GATTS_EVT_TIMEOUT:
                // Disconnect on GATT Server timeout event.
                err_code = sd_ble_gap_disconnect(p_ble_evt->evt.gatts_evt.conn_handle,
                                                 BLE_HCI_REMOTE_USER_TERMINATED_CONNECTION);
                APP_ERROR_CHECK(err_code);
                break;
    
            default:
                // No implementation needed.
                break;
        }
    }
    
    
    /**@brief Function for the SoftDevice initialization.
     *
     * @details This function initializes the SoftDevice and the BLE event interrupt.
     */
    static void ble_stack_init(void)
    {
        ret_code_t err_code;
    
        err_code = nrf_sdh_enable_request();
        APP_ERROR_CHECK(err_code);
    
        // Configure the BLE stack using the default settings.
        // Fetch the start address of the application RAM.
        uint32_t ram_start = 0;
        err_code = nrf_sdh_ble_default_cfg_set(APP_BLE_CONN_CFG_TAG, &ram_start);
        APP_ERROR_CHECK(err_code);
    
        // Enable BLE stack.
        err_code = nrf_sdh_ble_enable(&ram_start);
        APP_ERROR_CHECK(err_code);
    
        // 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 GATT library. */
    void gatt_evt_handler(nrf_ble_gatt_t * p_gatt, nrf_ble_gatt_evt_t const * p_evt)
    {
        if ((m_conn_handle == p_evt->conn_handle) && (p_evt->evt_id == NRF_BLE_GATT_EVT_ATT_MTU_UPDATED))
        {
            m_ble_nus_max_data_len = p_evt->params.att_mtu_effective - OPCODE_LENGTH - HANDLE_LENGTH;
            NRF_LOG_INFO("Data len is set to 0x%X(%d)", m_ble_nus_max_data_len, m_ble_nus_max_data_len);
        }
        NRF_LOG_DEBUG("ATT MTU exchange completed. central 0x%x peripheral 0x%x",
                      p_gatt->att_mtu_desired_central,
                      p_gatt->att_mtu_desired_periph);
    }
    
    
    /**@brief Function for initializing the GATT library. */
    void gatt_init(void)
    {
        ret_code_t err_code;
    
        err_code = nrf_ble_gatt_init(&m_gatt, gatt_evt_handler);
        APP_ERROR_CHECK(err_code);
    
        err_code = nrf_ble_gatt_att_mtu_periph_set(&m_gatt, NRF_SDH_BLE_GATT_MAX_MTU_SIZE);
        APP_ERROR_CHECK(err_code);
    }
    
    
    /**@brief Function for handling events from the BSP module.
     *
     * @param[in]   event   Event generated by button press.
     */
    void bsp_event_handler(bsp_event_t event)
    {
        uint32_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 handling app_uart events.
     *
     * @details This function will receive a single character from the app_uart module and append it to
     *          a string. The string will be be sent over BLE when the last character received was a
     *          'new line' '\n' (hex 0x0A) or if the string has reached the maximum data length.
     */
    /**@snippet [Handling the data received over UART] */
    void uart_event_handle(app_uart_evt_t * p_event)
    {
        static uint8_t data_array[BLE_NUS_MAX_DATA_LEN];
        static uint8_t index = 0;
        uint32_t       err_code;
    
        switch (p_event->evt_type)
        {
            case APP_UART_DATA_READY:
                UNUSED_VARIABLE(app_uart_get(&data_array[index]));
                index++;
    
                if ((data_array[index - 1] == '\n') ||
                    (data_array[index - 1] == '\r') ||
                    (index >= m_ble_nus_max_data_len))
                {
                    if (index > 1)
                    {
                        NRF_LOG_DEBUG("Ready to send data over BLE NUS");
                        NRF_LOG_HEXDUMP_DEBUG(data_array, index);
    
                        do
                        {
                            uint16_t length = (uint16_t)index;
                            err_code = ble_nus_data_send(&m_nus, data_array, &length, m_conn_handle);
                            if ((err_code != NRF_ERROR_INVALID_STATE) &&
                                (err_code != NRF_ERROR_RESOURCES) &&
                                (err_code != NRF_ERROR_NOT_FOUND))
                            {
                                APP_ERROR_CHECK(err_code);
                            }
                        } while (err_code == NRF_ERROR_RESOURCES);
                    }
    
                    index = 0;
                }
                break;
    
            case APP_UART_COMMUNICATION_ERROR:
                APP_ERROR_HANDLER(p_event->data.error_communication);
                break;
    
            case APP_UART_FIFO_ERROR:
                APP_ERROR_HANDLER(p_event->data.error_code);
                break;
    
            default:
                break;
        }
    }
    /**@snippet [Handling the data received over UART] */
    
    
    /**@brief  Function for initializing the UART module.
     */
    /**@snippet [UART Initialization] */
    static void uart_init(void)
    {
        uint32_t                     err_code;
        app_uart_comm_params_t const comm_params =
        {
            .rx_pin_no    = RX_PIN_NUMBER,
            .tx_pin_no    = TX_PIN_NUMBER,
            .rts_pin_no   = RTS_PIN_NUMBER,
            .cts_pin_no   = CTS_PIN_NUMBER,
            .flow_control = APP_UART_FLOW_CONTROL_DISABLED,
            .use_parity   = false,
    #if defined (UART_PRESENT)
            .baud_rate    = NRF_UART_BAUDRATE_115200
    #else
            .baud_rate    = NRF_UARTE_BAUDRATE_115200
    #endif
        };
    
        APP_UART_FIFO_INIT(&comm_params,
                           UART_RX_BUF_SIZE,
                           UART_TX_BUF_SIZE,
                           uart_event_handle,
                           APP_IRQ_PRIORITY_LOWEST,
                           err_code);
        APP_ERROR_CHECK(err_code);
    }
    /**@snippet [UART Initialization] */
    
    
    /**@brief Function for initializing the Advertising functionality.
     */
    static void advertising_init(void)
    {
       // TO change mode of connection go to sdk_config.h and enable or disable BLE_APP_UART_NON_CONNECT for particular use case.
      
        uint32_t               err_code;
        ble_advertising_init_t init;
    
        memset(&init, 0, sizeof(init));
    
        ble_advdata_manuf_data_t                  manuf_data; //Variable to hold manufacturer specific data
        char data[5]; //Our data to advertise
        /*for(int i=0;i<5;i++)
        {
          data[i]=reg[i];
          printf("%c",data[i]);
        }*/                            // uncomment above to send TWI data
    
        //data[0] = counter;
        printf("\n");
    
        manuf_data.company_identifier             = 0x0059; //Nordics company ID
        manuf_data.data.p_data                    = data;
        if(data[0] == 255)
        {
          //counter = 0;
        }
        manuf_data.data.size                      = sizeof(data);
        init.advdata.p_manuf_specific_data = &manuf_data;
    
        init.advdata.name_type          = BLE_ADVDATA_FULL_NAME;
        init.advdata.include_appearance = false;
        init.advdata.flags              = BLE_GAP_ADV_FLAGS_LE_ONLY_LIMITED_DISC_MODE;
    
    
        init.srdata.uuids_complete.uuid_cnt = sizeof(m_adv_uuids) / sizeof(m_adv_uuids[0]);
        init.srdata.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;
    
        ble_advertising_init(&m_advertising, &init);
        APP_ERROR_CHECK(err_code);
    
        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;
    
        uint32_t err_code = bsp_init(BSP_INIT_LEDS | BSP_INIT_BUTTONS, bsp_event_handler);
        APP_ERROR_CHECK(err_code);
    
        err_code = bsp_btn_ble_init(NULL, &startup_event);
        APP_ERROR_CHECK(err_code);
    
        *p_erase_bonds = (startup_event == BSP_EVENT_CLEAR_BONDING_DATA);
    }
    
    
    /**@brief Function for initializing the nrf log module.
     */
    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 initializing power management.
     */
    static void power_management_init(void)
    {
        ret_code_t err_code;
        err_code = nrf_pwr_mgmt_init();
        APP_ERROR_CHECK(err_code);
    }
    
    
    /**@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(void)
    {
        uint32_t err_code = ble_advertising_start(&m_advertising, BLE_ADV_MODE_FAST);
        APP_ERROR_CHECK(err_code);
        nrf_gpio_cfg_output(13);
        nrf_gpio_pin_clear(13);
        nrf_delay_ms(500);
        nrf_gpio_pin_set(13);
    }
    
    
    /**@brief Application main function.
     */
    int main(void)
    {
        nrf_gpio_cfg_output(16);
        nrf_delay_ms(500);
        nrf_gpio_pin_clear(16);
        nrf_delay_ms(2000);
        nrf_gpio_pin_set(16);
        bool erase_bonds;
    
        //TWI WAS DISABLED. TO ENABLE CHANGE TWI OPTION TO SET IN CMSIS OF SDK_CONFIG.H
        // Initialize.
        uart_init(); // don't comment out this function and don't disable any uart config in
        log_init();
        timers_init();
        create_timers();
        app_timer_start(m_repeated_timer_id_1, APP_TIMER_TICKS(11000), NULL);
        //buttons_leds_init(&erase_bonds);
        power_management_init();
        ble_stack_init();
        gap_params_init();
        gatt_init();
        services_init();
        advertising_init();
        conn_params_init();
        //twi_init();
        
        // Start execution.
        //printf("\r\nUART started.\r\n");
        NRF_LOG_INFO("Debug logging for UART over RTT started.");
        advertising_start();
        // Enter main loop.
        for (;;)
        {
            idle_state_handle();
        }
        
    }
    
    
    /**
     * @}
     */
    
    whenever code is at sd_ble_gap_adv_set_configure() device resets and if i comment it then it is advertising in legacy mode even if the primary_phy i made as coded phy in ble_advertisng_init().

  • Hi.

    You really should not modify source files inside the SDK, this can have unwelcome consequences.

    I suggest that you revert the modifications you have made in ble_advertisng.c, and take a look at how have implemented BLE_GAP_PHY_CODED in the GitHub link he attached in his reply, you should only have to modify advertising_init in order to configure coded phy.

    Best regards,

    Andreas

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