Projects for Writing into Flash Memory does not work on nRF52840 dongle

[shaileshbc]

I am using nRF52840 dongle and nRF SDK version nRF5_SDK_17.0.0_9d13099.

When I am trying to debug the application it gives an error.

using your example project on nRF52840 dongle

nRF5_SDK_17.0.0_9d13099\examples\peripheral\flash_fds\pca10056\s140\ses\flash_fds_s140_pca10056.emProject

main.c 

Line 352 rc = fds_record_update(&desc, &m_dummy_record);
after that it goes to
app_error_weak.c file , Line no. 100

nRF5_SDK_17.0.0_9d13099\examples\peripheral\flash_fstorage\pca10056\s140\ses\flash_fstorage_s140_pca10056.emProject

main.c

line no. 284 rc = nrf_fstorage_write(&fstorage, 0x3e100, &m_data, sizeof(m_data), NULL);
after that it goes to
app_error_weak.c file , Line no. 100

nRF5_SDK_17.0.0_9d13099\examples\peripheral\flashwrite\pca10056\blank\ses\flashwrite_pca10056.emProject

When trying to write hex file into the dongle, it does not allow to add softdevice hex file, stating that the hex file is overlapping.

if I try to write hex file flashwrite_pca10056.hex, it gives an error, log of the programmer is   2020-08-11T07_59_13.264Z-log.txt

do let me know, what I am missing.

[Amanda Hsieh]

Hi, 

Flash Data Storage Example needs to establish a UART connection, but the nRF52840 dongle there is no UART connected to the PC, other than the virtual COM port that is used for programming via Serial DFU (USB).

You should consider the nRF52840 DK instead if you want to develop firmware for the nRF52840. The nRF52840 dongle is primarily intended to be used together with nRF Connect for desktop and is not well suitable as a development board. This is primarily because it lacks an onboard debugger. 

-Amanda H.

[shaileshbc]

Hi Amanda,

Do you mean that if I do not establish a UART connection, I can't write in Flash Memory?

regards

Shailesh

[Amanda Hsieh]

Hi Shailesh, 

Sorry to cause the misunderstand. 

The Flash Data Storage Example needs to establish a UART connection to test the command, but the nRF52840-Dongle there is no UART connected to the PC. If you will use write command in the UART to write flash, I would suggest you use the nRF52840DK. If you just write the flash with the function, it should be fine. 

app_error_weak.c file , Line no. 100

You should add the define DEBUG in your Preprocessor(Project -> Edit Options -> Preprocessor -> Preprocessor Definitions), then add a breakpoint on app_error_fault_handler() to see which error you get. You will see which error you get and which function is returning this error.

 

When trying to write hex file into the dongle, it does not allow to add softdevice hex file, stating that the hex file is overlapping.

You should give the flash start address FLASH_START=0x27000 to the flashwrite_pca10056.hex. You can refer to the setting in the flash_fstorage_s140_pca10056.emProject by right-click the project -> options -> Linker -> Section Placement Macro.  

if I try to write hex file flashwrite_pca10056.hex, it gives an error, log of the programmer is   2020-08-11T07_59_13.264Z-log.txt

 Are you able to write other hex files like softdevice_s132.hex? If you still get the error, run "nrfjprog --recover" with nRF-Command-Line-Tools. 

-Amanda H.

[shaileshbc]

Hi Amanda,

As per your suggestion, I added a breakpoint in app_error_fault_handler(), it gives an error NRF_FAULT_ID_SD_ASSERT, when I used the project nRF5_SDK_17.0.0_9d13099\examples\peripheral\flash_fstorage

and 

nRF5_SDK_17.0.0_9d13099\examples\peripheral\flash_fds\pca10056\s140\ses.

I couldn't found which function is returning that error code, as after each execution of the command, return code is zero.

regards

Shailesh

[Amanda Hsieh]

Hi Shailesh, 

Did you modify the example? If so, I would suspect you are running into the same issue as in this post. The proposed workaround, for now, is to split long writes into multiple shorter writes.

Besides that, it is hard to say what causes this without some logs or which functions that are triggering this assert. Is it possible to provide any logs?

It seems like you got "id" also along with "PC". Since you narrowed the hardfault id to be NRF_FAULT_ID_SD_ASSERT. The line number and file name of the assert is located inside the info structure in app_error.h file

typedef struct
{
uint16_t line_num; /**< The line number where the error occurred. */
uint8_t const * p_file_name; /**< The file in which the error occurred. */
} assert_info_t;

Check if you have some valid structure here, if not then something is wrong. Are you seeing these values in a log or in a debug window? If it is the debug window, then I would suggest you to compile the code with no optimizations (and hope that the timing has not changed to be able to reproduce this error.) If you use the segger, you can compile with debug mode. 

More info regarding the assert, something within the SoftDevice was not finished within the required timing constraints. You may get this error if interrupts have been disabled, if you use the timeslot API and do not release the timeslot in time, if you run application code at an interrupt level higher than or equal to the highest level of the SoftDevice, or if you pause program execution in a debug session (i.e. single stepping, breakpoints, etc.).

Might be helpful to have a look at this.

-Amanda H.

[shaileshbc]

Hi Amanda ,

I had modified main.c file of ble_app_blinky_pca10059_s140.emProject located at
nRF5_SDK_17.0.0_9d13099\examples\ble_peripheral\ble_app_blinky\pca10059\s140\ses.

Added code from nRF5_SDK_17.0.0_9d13099\examples\peripheral\flashwrite\main.c

I am able to write data into flash memory successfully when i executes write command after calling
flash_page_init() function, but it fails if i execute write function after advertising_start() function.
following error occurs
id = NRF_FAULT_ID_APP_MEMACC
pc = 0x0002ef0e
info = 0x40000000

Fullscreen 013055.main.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.
 *
 */
/**
 * @brief Blinky Sample Application main file.
 *
 * This file contains the source code for a sample server application using the LED Button service.
 */

#include <stdint.h>
#include <string.h>
#include "nordic_common.h"
#include "nrf.h"
#include "app_error.h"
#include "ble.h"
#include "ble_err.h"
#include "ble_hci.h"
#include "ble_srv_common.h"
#include "ble_advdata.h"
#include "ble_conn_params.h"
#include "nrf_sdh.h"
#include "nrf_sdh_ble.h"
#include "boards.h"
#include "app_timer.h"
#include "app_button.h"
#include "ble_lbs.h"
#include "nrf_ble_gatt.h"
#include "nrf_ble_qwr.h"
#include "nrf_pwr_mgmt.h"

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

#define FLASHWRITE_EXAMPLE_MAX_STRING_LEN       (62u)
#define FLASHWRITE_EXAMPLE_BLOCK_VALID          (0xA55A5AA5)
#define FLASHWRITE_EXAMPLE_BLOCK_INVALID        (0xA55A0000)
#define FLASHWRITE_EXAMPLE_BLOCK_NOT_INIT       (0xFFFFFFFF)

//static char data[] = "AABBCCDD";

typedef struct
{
   uint32_t magic_number;
   uint32_t buffer[FLASHWRITE_EXAMPLE_MAX_STRING_LEN + 1]; // + 1 for end of string
} flashwrite_example_flash_data_t;

typedef struct
{
    uint32_t addr;
    uint32_t pg_size;
    uint32_t pg_num;
    flashwrite_example_flash_data_t * m_p_flash_data;
} flashwrite_example_data_t;

static flashwrite_example_data_t m_data;


#define ADVERTISING_LED                 BSP_BOARD_LED_0                         /**< Is on when device is advertising. */
#define CONNECTED_LED                   BSP_BOARD_LED_1                         /**< Is on when device has connected. */
#define LEDBUTTON_LED                   BSP_BOARD_LED_2                         /**< LED to be toggled with the help of the LED Button Service. */
#define LEDBUTTON_BUTTON                BSP_BUTTON_0                            /**< Button that will trigger the notification event with the LED Button Service */

#define DEVICE_NAME                     "Nordic_Blinky"                         /**< Name of device. Will be included in the advertising data. */

#define APP_BLE_OBSERVER_PRIO           3                                       /**< Application's BLE observer priority. You shouldn't need to modify this value. */
#define APP_BLE_CONN_CFG_TAG            1                                       /**< A tag identifying the SoftDevice BLE configuration. */

#define APP_ADV_INTERVAL                64                                      /**< The advertising interval (in units of 0.625 ms; this value corresponds to 40 ms). */
#define APP_ADV_DURATION                BLE_GAP_ADV_TIMEOUT_GENERAL_UNLIMITED   /**< The advertising time-out (in units of seconds). When set to 0, we will never time out. */


#define MIN_CONN_INTERVAL               MSEC_TO_UNITS(100, UNIT_1_25_MS)        /**< Minimum acceptable connection interval (0.5 seconds). */
#define MAX_CONN_INTERVAL               MSEC_TO_UNITS(200, UNIT_1_25_MS)        /**< Maximum acceptable connection interval (1 second). */
#define SLAVE_LATENCY                   0                                       /**< Slave latency. */
#define CONN_SUP_TIMEOUT                MSEC_TO_UNITS(4000, UNIT_10_MS)         /**< Connection supervisory time-out (4 seconds). */

#define FIRST_CONN_PARAMS_UPDATE_DELAY  APP_TIMER_TICKS(20000)                  /**< Time from initiating event (connect or start of notification) to first time sd_ble_gap_conn_param_update is called (15 seconds). */
#define NEXT_CONN_PARAMS_UPDATE_DELAY   APP_TIMER_TICKS(5000)                   /**< Time between each call to sd_ble_gap_conn_param_update after the first call (5 seconds). */
#define MAX_CONN_PARAMS_UPDATE_COUNT    3                                       /**< Number of attempts before giving up the connection parameter negotiation. */

#define BUTTON_DETECTION_DELAY          APP_TIMER_TICKS(50)                     /**< Delay from a GPIOTE event until a button is reported as pushed (in number of timer ticks). */

#define DEAD_BEEF                       0xDEADBEEF                              /**< Value used as error code on stack dump, can be used to identify stack location on stack unwind. */


BLE_LBS_DEF(m_lbs);                                                             /**< LED Button Service instance. */
NRF_BLE_GATT_DEF(m_gatt);                                                       /**< GATT module instance. */
NRF_BLE_QWR_DEF(m_qwr);                                                         /**< Context for the Queued Write module.*/

static uint16_t m_conn_handle = BLE_CONN_HANDLE_INVALID;                        /**< Handle of the current connection. */

static uint8_t m_adv_handle = BLE_GAP_ADV_SET_HANDLE_NOT_SET;                   /**< Advertising handle used to identify an advertising set. */
static uint8_t m_enc_advdata[BLE_GAP_ADV_SET_DATA_SIZE_MAX];                    /**< Buffer for storing an encoded advertising set. */
static uint8_t m_enc_scan_response_data[BLE_GAP_ADV_SET_DATA_SIZE_MAX];         /**< Buffer for storing an encoded scan data. */

/**@brief Struct that contains pointers to the encoded advertising data. */
static ble_gap_adv_data_t m_adv_data =
{
    .adv_data =
    {
        .p_data = m_enc_advdata,
        .len    = BLE_GAP_ADV_SET_DATA_SIZE_MAX
    },
    .scan_rsp_data =
    {
        .p_data = m_enc_scan_response_data,
        .len    = BLE_GAP_ADV_SET_DATA_SIZE_MAX

    }
};

/**@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 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] 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);
}


/**@brief Function for the LEDs initialization.
 *
 * @details Initializes all LEDs used by the application.
 */
static void leds_init(void)
{
    bsp_board_init(BSP_INIT_LEDS);
}


/**@brief Function for the Timer initialization.
 *
 * @details Initializes the timer module.
 */
static void timers_init(void)
{
    // Initialize timer module, making it use the scheduler
    ret_code_t err_code = app_timer_init();
    APP_ERROR_CHECK(err_code);
}


/**@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)
{
    ret_code_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 initializing the GATT module.
 */
static void gatt_init(void)
{
    ret_code_t err_code = nrf_ble_gatt_init(&m_gatt, NULL);
    APP_ERROR_CHECK(err_code);
}


/**@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)
{
    ret_code_t    err_code;
    ble_advdata_t advdata;
    ble_advdata_t srdata;

    ble_uuid_t adv_uuids[] = {{LBS_UUID_SERVICE, m_lbs.uuid_type}};

    // Build and set advertising data.
    memset(&advdata, 0, sizeof(advdata));

    advdata.name_type          = BLE_ADVDATA_FULL_NAME;
    advdata.include_appearance = true;
    advdata.flags              = BLE_GAP_ADV_FLAGS_LE_ONLY_GENERAL_DISC_MODE;


    memset(&srdata, 0, sizeof(srdata));
    srdata.uuids_complete.uuid_cnt = sizeof(adv_uuids) / sizeof(adv_uuids[0]);
    srdata.uuids_complete.p_uuids  = adv_uuids;

    err_code = ble_advdata_encode(&advdata, m_adv_data.adv_data.p_data, &m_adv_data.adv_data.len);
    APP_ERROR_CHECK(err_code);

    err_code = ble_advdata_encode(&srdata, m_adv_data.scan_rsp_data.p_data, &m_adv_data.scan_rsp_data.len);
    APP_ERROR_CHECK(err_code);

    ble_gap_adv_params_t adv_params;

    // Set advertising parameters.
    memset(&adv_params, 0, sizeof(adv_params));

    adv_params.primary_phy     = BLE_GAP_PHY_1MBPS;
    adv_params.duration        = APP_ADV_DURATION;
    adv_params.properties.type = BLE_GAP_ADV_TYPE_CONNECTABLE_SCANNABLE_UNDIRECTED;
    adv_params.p_peer_addr     = NULL;
    adv_params.filter_policy   = BLE_GAP_ADV_FP_ANY;
    adv_params.interval        = APP_ADV_INTERVAL;

    err_code = sd_ble_gap_adv_set_configure(&m_adv_handle, &m_adv_data, &adv_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 write events to the LED characteristic.
 *
 * @param[in] p_lbs     Instance of LED Button Service to which the write applies.
 * @param[in] led_state Written/desired state of the LED.
 */
static void led_write_handler(uint16_t conn_handle, ble_lbs_t * p_lbs, uint8_t led_state)
{
    if (led_state)
    {
        bsp_board_led_on(LEDBUTTON_LED);
        NRF_LOG_INFO("Received LED ON!");
    }
    else
    {
        bsp_board_led_off(LEDBUTTON_LED);
        NRF_LOG_INFO("Received LED OFF!");
    }
}


/**@brief Function for initializing services that will be used by the application.
 */
static void services_init(void)
{
    ret_code_t         err_code;
    ble_lbs_init_t     init     = {0};
    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 LBS.
    init.led_write_handler = led_write_handler;

    err_code = ble_lbs_init(&m_lbs, &init);
    APP_ERROR_CHECK(err_code);
}


/**@brief Function for handling the Connection Parameters Module.
 *
 * @details This function will be called for all events in the Connection Parameters Module that
 *          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)
{
    ret_code_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 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)
{
    ret_code_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 starting advertising.
 */
static void advertising_start(void)
{
    ret_code_t           err_code;

    err_code = sd_ble_gap_adv_start(m_adv_handle, APP_BLE_CONN_CFG_TAG);
    APP_ERROR_CHECK(err_code);

    bsp_board_led_on(ADVERTISING_LED);
}


/**@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)
{
    ret_code_t err_code;

    switch (p_ble_evt->header.evt_id)
    {
        case BLE_GAP_EVT_CONNECTED:
            NRF_LOG_INFO("Connected");
            bsp_board_led_on(CONNECTED_LED);
            bsp_board_led_off(ADVERTISING_LED);
            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);
            err_code = app_button_enable();
            APP_ERROR_CHECK(err_code);
            break;

        case BLE_GAP_EVT_DISCONNECTED:
            NRF_LOG_INFO("Disconnected");
            bsp_board_led_off(CONNECTED_LED);
            m_conn_handle = BLE_CONN_HANDLE_INVALID;
            err_code = app_button_disable();
            APP_ERROR_CHECK(err_code);
            advertising_start();
            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_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_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.
            NRF_LOG_DEBUG("GATT Client Timeout.");
            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.
            NRF_LOG_DEBUG("GATT Server Timeout.");
            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 initializing the BLE stack.
 *
 * @details 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 button handler module.
 *
 * @param[in] pin_no        The pin that the event applies to.
 * @param[in] button_action The button action (press/release).
 */
static void button_event_handler(uint8_t pin_no, uint8_t button_action)
{
    ret_code_t err_code;

    switch (pin_no)
    {
        case LEDBUTTON_BUTTON:
            NRF_LOG_INFO("Send button state change.");
            err_code = ble_lbs_on_button_change(m_conn_handle, &m_lbs, button_action);
            if (err_code != NRF_SUCCESS &&
                err_code != BLE_ERROR_INVALID_CONN_HANDLE &&
                err_code != NRF_ERROR_INVALID_STATE &&
                err_code != BLE_ERROR_GATTS_SYS_ATTR_MISSING)
            {
                APP_ERROR_CHECK(err_code);
            }
            break;

        default:
            APP_ERROR_HANDLER(pin_no);
            break;
    }
}


/**@brief Function for initializing the button handler module.
 */
static void buttons_init(void)
{
    ret_code_t err_code;

    //The array must be static because a pointer to it will be saved in the button handler module.
    static app_button_cfg_t buttons[] =
    {
        {LEDBUTTON_BUTTON, false, BUTTON_PULL, button_event_handler}
    };

    err_code = app_button_init(buttons, ARRAY_SIZE(buttons),
                               BUTTON_DETECTION_DELAY);
    APP_ERROR_CHECK(err_code);
}


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();
    }
}

static ret_code_t clock_config(void)
{
    ret_code_t err_code;

    err_code = nrf_drv_clock_init();
    if (err_code != NRF_SUCCESS && err_code != NRF_ERROR_MODULE_ALREADY_INITIALIZED)
    {
        return err_code;
    }

    nrf_drv_clock_lfclk_request(NULL);

    return NRF_SUCCESS;
}

static void flash_page_init(void)
{
    m_data.pg_num = NRF_FICR->CODESIZE - 1;
    m_data.pg_size = NRF_FICR->CODEPAGESIZE;
    m_data.addr = (m_data.pg_num * m_data.pg_size);

    m_data.m_p_flash_data = (flashwrite_example_flash_data_t *)m_data.addr;

    while (1)
    {
        if (m_data.m_p_flash_data->magic_number == FLASHWRITE_EXAMPLE_BLOCK_VALID)
        {
            return;
        }

        if (m_data.m_p_flash_data->magic_number == FLASHWRITE_EXAMPLE_BLOCK_INVALID)
        {
            ++m_data.m_p_flash_data;
            continue;
        }

        nrf_nvmc_page_erase(m_data.addr);
        return;
    }
}

static void flash_string_write(uint32_t address, const char * src, uint32_t num_words)
{
    uint32_t i;

    // Enable write.
    NRF_NVMC->CONFIG = NVMC_CONFIG_WEN_Wen;
    while (NRF_NVMC->READY == NVMC_READY_READY_Busy)
    {
    }

    for (i = 0; i < num_words; i++)
    {
        /* Only full 32-bit words can be written to Flash. */
        ((uint32_t*)address)[i] = 0x000000FFUL & (uint32_t)((uint8_t)src[i]);
        while (NRF_NVMC->READY == NVMC_READY_READY_Busy)
        {
        }
    }

    NRF_NVMC->CONFIG = NVMC_CONFIG_WEN_Ren;
    while (NRF_NVMC->READY == NVMC_READY_READY_Busy)
    {
    }
}


static void flashwrite_erase_cmd()
{
    nrf_nvmc_page_erase(m_data.addr);

    m_data.m_p_flash_data = (flashwrite_example_flash_data_t *)m_data.addr;
}

static void flashwrite_read_cmd()
{
    flashwrite_example_flash_data_t * p_data = (flashwrite_example_flash_data_t *)m_data.addr;
    char string_buff[FLASHWRITE_EXAMPLE_MAX_STRING_LEN + 1]; // + 1 for end of string

    if ((p_data == m_data.m_p_flash_data) &&
        (p_data->magic_number != FLASHWRITE_EXAMPLE_BLOCK_VALID))
    {
//        nrf_cli_fprintf(p_cli, NRF_CLI_WARNING, "Please write something first.\r\n");
        return;
    }

    while (p_data <= m_data.m_p_flash_data)
    {
        if ((p_data->magic_number != FLASHWRITE_EXAMPLE_BLOCK_VALID) &&
            (p_data->magic_number != FLASHWRITE_EXAMPLE_BLOCK_INVALID))
        {
//            nrf_cli_fprintf(p_cli, NRF_CLI_WARNING, "Corrupted data found.\r\n");
            return;
        }
        uint8_t i;
        for (i = 0 ; i <= FLASHWRITE_EXAMPLE_MAX_STRING_LEN; i++)
        {
            string_buff[i] = (char)p_data->buffer[i];
        }

//        nrf_cli_fprintf(p_cli, NRF_CLI_NORMAL, "%s\r\n", string_buff);
        ++p_data;
    }
}

static void flashwrite_write_cmd(size_t argc, char **argv)
{
    static uint16_t const page_size = 4096;

    if (argc < 2)
    {
//        nrf_cli_fprintf(p_cli, NRF_CLI_ERROR, "%s:%s", argv[0], " bad parameter count\r\n");
        return;
    }
    if (argc > 2)
    {
//        nrf_cli_fprintf(p_cli,
//                        NRF_CLI_WARNING,
//                        "%s:%s",
//                        argv[0],
//                        " bad parameter count - please use quotes\r\n");
        return;
    }

    uint32_t len = strlen(argv[1]);
    if (len > FLASHWRITE_EXAMPLE_MAX_STRING_LEN)
    {
//        nrf_cli_fprintf(p_cli,
//                        NRF_CLI_ERROR,
//                        "Too long string. Please limit entered string to %d chars.\r\n",
//                        FLASHWRITE_EXAMPLE_MAX_STRING_LEN);
        return;
    }

    if ((m_data.m_p_flash_data->magic_number != FLASHWRITE_EXAMPLE_BLOCK_NOT_INIT) &&
        (m_data.m_p_flash_data->magic_number != FLASHWRITE_EXAMPLE_BLOCK_VALID))
    {
//        nrf_cli_fprintf(p_cli, NRF_CLI_ERROR, "Flash corrupted, please errase it first.");
        return;
    }

    if (m_data.m_p_flash_data->magic_number == FLASHWRITE_EXAMPLE_BLOCK_VALID)
    {
        uint32_t new_end_addr = (uint32_t)(m_data.m_p_flash_data + 2);
        uint32_t diff = new_end_addr - m_data.addr;
        if (diff > page_size)
        {
//            nrf_cli_fprintf(p_cli,
//                            NRF_CLI_WARNING,
//                            "Not enough space - please erase flash first.\r\n");
            return;
        }
        nrf_nvmc_write_word((uint32_t)&m_data.m_p_flash_data->magic_number,
                            FLASHWRITE_EXAMPLE_BLOCK_INVALID);
        ++m_data.m_p_flash_data;
    }

    //++len -> store also end of string '\0'
    flash_string_write((uint32_t)m_data.m_p_flash_data->buffer, argv[1], ++len);
    nrf_nvmc_write_word((uint32_t)&m_data.m_p_flash_data->magic_number,
                        FLASHWRITE_EXAMPLE_BLOCK_VALID);
}


uint8_t d[] = {'A', 'B', 'C', 'D', 'E', 'F'};
uint8_t d1[] = {'0', '1', '2', '3', '4', '5'};

/**@brief Function for application main entry.
 */
int main(void)
{
    uint32_t err_code;
    // Initialize.
    log_init();

    err_code = app_timer_init();
    APP_ERROR_CHECK(err_code);

    err_code = clock_config();
    APP_ERROR_CHECK(err_code);

    flash_page_init();

    nrf_nvmc_write_bytes(m_data.addr, d, sizeof(d));

    leds_init();
//    timers_init();
    buttons_init();
    power_management_init();
    ble_stack_init();

    gap_params_init();
    gatt_init();
    services_init();
    advertising_init();
    conn_params_init();

    // Start execution.
    NRF_LOG_INFO("Blinky example started.");
    advertising_start();
  
//    nrf_nvmc_write_bytes(m_data.addr, d, sizeof(d));
    // Enter main loop.
    for (;;)
    {
        idle_state_handle();
    }
}


/**
 * @}
 */

I am using nrf52840 dongle.

regards

shailesh

[Amanda Hsieh]

Hi Shailesh, 

According to this softdevice specification, peripheral Id 30-> NVMC is a restricted peripheral when the softdevice is enabled. That means that it is not allowed to access NVMC registers directly from the application as those registered are inside access protected areas. And you can see in the implementation of nrf_nvmc_write_bytes that it is accessing NVMC registers directly, hence the memory fault. This post might help. 

-Amanda H.

[shaileshbc]

Hi Amanda,

In that case, it should also raise memory fault when I am running nrf_nvmc_write_bytes function, just after flash_page_init(), but it didn't raise any fault.

Fault is raised only, when i call nrf_nvmc_write_bytes function, after advertising_start() function in the example.

regards

Shailesh

[Amanda Hsieh]

Hi Shailesh, 

According to this softdevice specification, peripheral Id 30-> NVMC is a restricted peripheral when the softdevice is enabled. Therefore, it only happened to the nrf_nvmc_write_bytes function which is after your ble_stack_init().

-Amanda H. 

[shaileshbc]

Hi Amanda,

My main purpose is solved in writing data into Flash memory and sending it as advertising data.

Yesterday I come to know that the error which I was getting while debugging is due to the time taken to check the variable value and not related to coding.

It depends where I had added a breakpoint and how much time it takes to check and resume the execution of code.

if I take more time, then the error NRF_FAULT_ID_SD_ASSERT is raised.

You may close this ticket.

regards

Shailesh

[Amanda Hsieh]

Hi Shailesh, 

Great to know you find the root cause. 

Best regards,

-Amanda H.