BLEKey

/* Copyright (c) 2012 Nordic Semiconductor. All Rights Reserved.
 *
 * The information contained herein is property of Nordic Semiconductor ASA.
 * Terms and conditions of usage are described in detail in NORDIC
 * SEMICONDUCTOR STANDARD SOFTWARE LICENSE AGREEMENT.
 *
 * Licensees are granted free, non-transferable use of the information. NO
 * WARRANTY of ANY KIND is provided. This heading must NOT be removed from
 * the file.
 *
 */
// Board/nrf6310/ble/ble_app_wiegand/main.c
/** @example Board/nrf6310/ble/ble_app_wiegand/main.c
 *
 * @brief Heart Rate Service Sample Application main file.
 *
 * This file contains the source code for a sample application using the Heart Rate service
 * (and also Battery and Device Information services). This application uses the
 * @ref srvlib_conn_params module.
 */

#include <stdint.h>
#include <string.h>
#include <stdlib.h>
#include "nordic_common.h"
#include "nrf.h"
#include "app_error.h"
#include "nrf_gpio.h"
#include "nrf51_bitfields.h"
#include "ble.h"
#include "ble_hci.h"
#include "ble_srv_common.h"
#include "ble_advdata.h"
#include "ble_bas.h"
#include "ble_wiegand.h"
#include "ble_dis.h"
#include "ble_dfu.h"
#include "dfu_app_handler.h"
#include "ble_conn_params.h"
#include "boards.h"
#include "softdevice_handler.h"
#include "app_timer.h"
#include "ble_error_log.h"
#include "device_manager.h"
#include "ble_debug_assert_handler.h"
#include "pstorage.h"
#include "app_trace.h"
#include "wiegand.h"

#define IS_SRVC_CHANGED_CHARACT_PRESENT     0                                           /**< Include or not the service_changed characteristic. if not enabled, the server's database cannot be changed for the lifetime of the device*/

#define WAKEUP_BUTTON_PIN                    BUTTON_0                                   /**< Button used to wake up the application. */
#define BOND_DELETE_ALL_BUTTON_ID            BUTTON_1                                   /**< Button used for deleting all bonded centrals during startup. */

#define ADVERTISING_LED_PIN_NO               20                                         /**< Is on when device is advertising. */

#define DEVICE_NAME                          "BLEKey"                                   /**< Name of device. Will be included in the advertising data. */
#define MANUFACTURER_NAME                    "MB_EE"                                   /**< Manufacturer. Will be passed to Device Information Service. */
#define APP_ADV_INTERVAL                     0x0C80                                    /**< The advertising interval (in units of 0.625 ms). */
#define APP_ADV_TIMEOUT_IN_SECONDS           0                                       /**< The advertising timeout in units of seconds. */

#define APP_TIMER_PRESCALER                  0                                          /**< Value of the RTC1 PRESCALER register. */
#define APP_TIMER_MAX_TIMERS                 4                                          /**< Maximum number of simultaneously created timers. */
#define APP_TIMER_OP_QUEUE_SIZE              4                                          /**< Size of timer operation queues. */

#define BATTERY_LEVEL_MEAS_INTERVAL          APP_TIMER_TICKS(5000, APP_TIMER_PRESCALER) /**< Battery level measurement interval (ticks). */

#define MIN_CONN_INTERVAL                    MSEC_TO_UNITS(500, UNIT_1_25_MS)           /**< Minimum acceptable connection interval (0.5 seconds). */
#define MAX_CONN_INTERVAL                    MSEC_TO_UNITS(1000, 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 timeout (4 seconds). */

#define FIRST_CONN_PARAMS_UPDATE_DELAY       APP_TIMER_TICKS(5000, APP_TIMER_PRESCALER) /**< 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, APP_TIMER_PRESCALER)/**< 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 SEC_PARAM_TIMEOUT                    30                                         /**< Timeout for Pairing Request or Security Request (in seconds). */
#define SEC_PARAM_BOND                       1                                          /**< Perform bonding. */
#define SEC_PARAM_MITM                       1                                          /**< Changed from default! */
#define SEC_PARAM_IO_CAPABILITIES            BLE_GAP_IO_CAPS_DISPLAY_ONLY
#define SEC_PARAM_OOB                        0                                          /**< Out Of Band data not available. */
#define SEC_PARAM_MIN_KEY_SIZE               7                                          /**< Minimum encryption key size. */
#define SEC_PARAM_MAX_KEY_SIZE               16                                         /**< Maximum encryption key size. */

#define DEAD_BEEF                            0xDEADBEEF                                 /**< Value used as error code on stack dump, can be used to identify stack location on stack unwind. */
#define VBAT_MAX_IN_MV						 3000

static uint16_t                              m_conn_handle = BLE_CONN_HANDLE_INVALID;   /**< Handle of the current connection. */
static ble_gap_adv_params_t                  m_adv_params;                              /**< Parameters to be passed to the stack when starting advertising. */
static ble_bas_t                             m_bas;                                     /**< Structure used to identify the battery service. */
static ble_wiegand_t                         m_wiegand;                                 /**< Structure used to identify the heart rate service. */

static app_timer_id_t                        m_battery_timer_id;                        /**< Battery timer. */
//static app_timer_id_t                        m_heart_rate_timer_id;                     /**< Heart rate measurement timer. */
//static app_timer_id_t                        m_sensor_contact_timer_id;                 /**< Sensor contact detected timer. */

static dm_application_instance_t             m_app_handle;                              /**< Application identifier allocated by device manager */

static bool                                  m_memory_access_in_progress = false;       /**< Flag to keep track of ongoing operations on persistent memory. */
#ifdef BLE_DFU_APP_SUPPORT
static ble_dfu_t                             m_dfus;                                    /**< Structure used to identify the DFU service. */
#endif // BLE_DFU_APP_SUPPORT


static ble_gap_whitelist_t  whitelist;
static ble_gap_addr_t* whitelist_addrs[BLE_GAP_WHITELIST_ADDR_MAX_COUNT];
static ble_gap_irk_t* whitelist_irks[BLE_GAP_WHITELIST_IRK_MAX_COUNT];
static ble_gap_addr_t addr_1;

#if 1
/**@brief Function for error handling, which is called when an error has occurred.
 *
 * @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 error.
 *
 * @param[in] error_code  Error code supplied to the handler.
 * @param[in] line_num    Line number where the handler is called.
 * @param[in] p_file_name Pointer to the file name.
 */
void app_error_handler(uint32_t error_code, uint32_t line_num, const uint8_t * p_file_name)
{
    // This call can be used for debug purposes during application development.
    // @note CAUTION: Activating this code will write the stack to flash on an error.
    //                This function should NOT be used in a final product.
    //                It is intended STRICTLY for development/debugging purposes.
    //                The flash write will happen EVEN if the radio is active, thus interrupting
    //                any communication.
    //                Use with care. Uncomment the line below to use.
    // ble_debug_assert_handler(error_code, line_num, p_file_name);

    printf("%ld\n", error_code);
    // On assert, the system can only recover with a reset.
    //NVIC_SystemReset();
}
#else
#include "app_util_platform.h"

//uint32_t m_error_code;
//uint32_t m_line_num;
//const uint8_t *m_p_file_name;

void app_error_handler(uint32_t error_code, uint32_t line_num, const uint8_t * p_file_name)
{
    // disable INTs
    CRITICAL_REGION_ENTER();
    /* Light a LED on error or warning. */

    //    m_p_file_name = p_file_name;
    //    m_error_code = error_code;
    //    m_line_num = line_num;

    /* To be able to see function parameters in a debugger. */
    uint32_t temp = 1;
    while(temp);
    CRITICAL_REGION_EXIT();
}

#endif

/**@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);
}


//ADC initialization
static void adc_init(void)
{
    // Configure ADC
    NRF_ADC->CONFIG     = (ADC_CONFIG_RES_8bit                        << ADC_CONFIG_RES_Pos)     |
        (ADC_CONFIG_INPSEL_SupplyOneThirdPrescaling << ADC_CONFIG_INPSEL_Pos)  |
        (ADC_CONFIG_REFSEL_VBG                      << ADC_CONFIG_REFSEL_Pos)  |
        (ADC_CONFIG_PSEL_Disabled                   << ADC_CONFIG_PSEL_Pos)    |
        (ADC_CONFIG_EXTREFSEL_None                  << ADC_CONFIG_EXTREFSEL_Pos);
    NRF_ADC->EVENTS_END = 0;
    NRF_ADC->ENABLE     = ADC_ENABLE_ENABLE_Enabled;
}

/**@brief Function for performing battery measurement and updating the Battery Level characteristic
 *        in Battery Service.
 */
static void battery_level_update(void)
{
    uint32_t err_code;
    uint8_t  battery_level;

    NRF_ADC->EVENTS_END  = 0;    // Stop any running conversions.
    NRF_ADC->TASKS_START = 1;

    while (!NRF_ADC->EVENTS_END)
    {
    }

    uint16_t vbg_in_mv = 1200;
    uint8_t adc_max = 255;
    uint16_t vbat_current_in_mv = (NRF_ADC->RESULT * 3 * vbg_in_mv) / adc_max;

    NRF_ADC->EVENTS_END     = 0;
    NRF_ADC->TASKS_STOP     = 1;

    battery_level = ((vbat_current_in_mv * 100) / VBAT_MAX_IN_MV);

    err_code = ble_bas_battery_level_update(&m_bas, battery_level);
    if ((err_code != NRF_SUCCESS) &&
            (err_code != NRF_ERROR_INVALID_STATE) &&
            (err_code != BLE_ERROR_NO_TX_BUFFERS) &&
            (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.
 */
static void battery_level_meas_timeout_handler(void * p_context)
{
    UNUSED_PARAMETER(p_context);
    battery_level_update();
}


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


/**@brief Function for the Timer initialization.
 *
 * @details Initializes the timer module. This creates and starts application timers.
 */
static void timers_init(void)
{
    uint32_t err_code;

    // Initialize timer module.
    APP_TIMER_INIT(APP_TIMER_PRESCALER, APP_TIMER_MAX_TIMERS, APP_TIMER_OP_QUEUE_SIZE, false);

    // Create timers.
    err_code = app_timer_create(&m_battery_timer_id,
            APP_TIMER_MODE_REPEATED,
            battery_level_meas_timeout_handler);
    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)
{
    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);

    err_code = sd_ble_gap_appearance_set(BLE_APPEARANCE_HEART_RATE_SENSOR_HEART_RATE_BELT);
    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 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)
{
    uint32_t      err_code;
    ble_advdata_t advdata;
    uint8_t       flags = BLE_GAP_ADV_FLAG_BR_EDR_NOT_SUPPORTED;

    ble_uuid_t adv_uuids[] =
    {
        {BLE_UUID_BATTERY_SERVICE,            BLE_UUID_TYPE_BLE},
        {BLE_UUID_DEVICE_INFORMATION_SERVICE, BLE_UUID_TYPE_BLE}
    };

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

    advdata.name_type               = BLE_ADVDATA_FULL_NAME;
    advdata.include_appearance      = true;
    advdata.flags.size              = sizeof(flags);
    advdata.flags.p_data            = &flags;
    advdata.uuids_complete.uuid_cnt = sizeof(adv_uuids) / sizeof(adv_uuids[0]);
    advdata.uuids_complete.p_uuids  = adv_uuids;

    err_code = ble_advdata_set(&advdata, NULL);
    APP_ERROR_CHECK(err_code);

    memset(&whitelist, 0, sizeof(ble_gap_whitelist_t));

    /* example of adding a whitelist */
    /*
    addr_1.addr[0] = 0xAA;
    addr_1.addr[1] = 0xBB;
    addr_1.addr[1] = 0xCC;
    addr_1.addr[1] = 0xDD;
    addr_1.addr[4] = 0xEE;
    addr_1.addr[5] = 0xFF;
    addr_1.addr_type = 0;
    */

    whitelist_addrs[0] = &addr_1;

    whitelist.pp_addrs = whitelist_addrs;
    whitelist.addr_count = 1;
    whitelist.pp_irks = whitelist_irks;
    whitelist.irk_count = 0;

    // Initialize advertising parameters (used when starting advertising).
    memset(&m_adv_params, 0, sizeof(m_adv_params));

    m_adv_params.type        = BLE_GAP_ADV_TYPE_ADV_IND;
    m_adv_params.p_peer_addr = NULL;                           // Undirected advertisement.
    /* change to BLE BLE_GAP_ADV_FP_FILTER_BOTH to enable whitelist */
    m_adv_params.fp          = BLE_GAP_ADV_FP_ANY;
    m_adv_params.interval    = APP_ADV_INTERVAL;
    m_adv_params.timeout     = APP_ADV_TIMEOUT_IN_SECONDS;
    m_adv_params.p_whitelist = &whitelist;
}


#ifdef BLE_DFU_APP_SUPPORT
static void advertising_stop(void)
{
    uint32_t err_code;

    err_code = sd_ble_gap_adv_stop();
    APP_ERROR_CHECK(err_code);

    nrf_gpio_pin_clear(ADVERTISING_LED_PIN_NO);
}


/** @snippet [DFU BLE Reset prepare] */
static void reset_prepare(void)
{
    uint32_t err_code;

    if (m_conn_handle != BLE_CONN_HANDLE_INVALID)
    {
        // Disconnect from peer.
        err_code = sd_ble_gap_disconnect(m_conn_handle, BLE_HCI_REMOTE_USER_TERMINATED_CONNECTION);
        APP_ERROR_CHECK(err_code);
    }
    else
    {
        // If not connected, then the device will be advertising. Hence stop the advertising.
        advertising_stop();
    }

    nrf_gpio_pin_clear(ADVERTISING_LED_PIN_NO);

    err_code = ble_conn_params_stop();
    APP_ERROR_CHECK(err_code);
}
/** @snippet [DFU BLE Reset prepare] */
#endif // BLE_DFU_APP_SUPPORT


/**@brief Function for initializing services that will be used by the application.
 *
 * @details Initialize the Heart Rate, Battery and Device Information services.
 */
static void services_init(void)
{
    uint32_t       err_code;
    ble_wiegand_init_t wiegand_init;
    ble_bas_init_t bas_init;
    ble_dis_init_t dis_init;
    uint8_t        body_sensor_location;

    // Initialize Heart Rate Service.
    body_sensor_location = 0xDE;

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

    wiegand_init.evt_handler                 = NULL;
    wiegand_init.is_sensor_contact_supported = true;
    wiegand_init.p_body_sensor_location      = &body_sensor_location;

    // Here the sec level for the Heart Rate Service can be changed/increased.
    BLE_GAP_CONN_SEC_MODE_SET_OPEN(&wiegand_init.wiegand_last_cards_attr_md.read_perm);
    BLE_GAP_CONN_SEC_MODE_SET_NO_ACCESS(&wiegand_init.wiegand_last_cards_attr_md.write_perm);

    BLE_GAP_CONN_SEC_MODE_SET_NO_ACCESS(&wiegand_init.wiegand_replay_attr_md.read_perm);
    BLE_GAP_CONN_SEC_MODE_SET_OPEN(&wiegand_init.wiegand_replay_attr_md.write_perm);

    BLE_GAP_CONN_SEC_MODE_SET_NO_ACCESS(&wiegand_init.wiegand_replay_attr_md.read_perm);
    BLE_GAP_CONN_SEC_MODE_SET_OPEN(&wiegand_init.wiegand_replay_attr_md.write_perm);

    BLE_GAP_CONN_SEC_MODE_SET_OPEN(&wiegand_init.wiegand_replay_attr_md.read_perm);
    BLE_GAP_CONN_SEC_MODE_SET_OPEN(&wiegand_init.wiegand_replay_attr_md.write_perm);

    err_code = ble_wiegand_init(&m_wiegand, &wiegand_init);
    APP_ERROR_CHECK(err_code);

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

    // Here the sec level for the Battery Service can be changed/increased.
    BLE_GAP_CONN_SEC_MODE_SET_OPEN(&bas_init.battery_level_char_attr_md.cccd_write_perm);
    BLE_GAP_CONN_SEC_MODE_SET_OPEN(&bas_init.battery_level_char_attr_md.read_perm);
    BLE_GAP_CONN_SEC_MODE_SET_NO_ACCESS(&bas_init.battery_level_char_attr_md.write_perm);

    BLE_GAP_CONN_SEC_MODE_SET_OPEN(&bas_init.battery_level_report_read_perm);

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

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

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

    ble_srv_ascii_to_utf8(&dis_init.manufact_name_str, (char *)MANUFACTURER_NAME);

    BLE_GAP_CONN_SEC_MODE_SET_OPEN(&dis_init.dis_attr_md.read_perm);
    BLE_GAP_CONN_SEC_MODE_SET_NO_ACCESS(&dis_init.dis_attr_md.write_perm);

    err_code = ble_dis_init(&dis_init);
    APP_ERROR_CHECK(err_code);

#ifdef BLE_DFU_APP_SUPPORT
    /** @snippet [DFU BLE Service initialization] */
    ble_dfu_init_t   dfus_init;

    // Initialize the Device Firmware Update Service.
    memset(&dfus_init, 0, sizeof(dfus_init));

    dfus_init.evt_handler    = dfu_app_on_dfu_evt;
    dfus_init.error_handler  = NULL; //service_error_handler - Not used as only the switch from app to DFU mode is required and not full dfu service.

    err_code = ble_dfu_init(&m_dfus, &dfus_init);
    APP_ERROR_CHECK(err_code);

    dfu_app_reset_prepare_set(reset_prepare);
    /** @snippet [DFU BLE Service initialization] */
#endif // BLE_DFU_APP_SUPPORT
}


/**@brief Function for starting application timers.
*/
static void application_timers_start(void)
{
    uint32_t err_code;

    // Start application timers.
    err_code = app_timer_start(m_battery_timer_id, BATTERY_LEVEL_MEAS_INTERVAL, NULL);
    APP_ERROR_CHECK(err_code);
}


/**@brief Function for starting advertising.
*/
static void advertising_start(void)
{
    uint32_t err_code;
    uint32_t count;

    // Verify if there is any flash access pending, if yes delay starting advertising until
    // it's complete.
    err_code = pstorage_access_status_get(&count);
    APP_ERROR_CHECK(err_code);

    if (count != 0)
    {
        m_memory_access_in_progress = true;
        return;
    }

    err_code = sd_ble_gap_adv_start(&m_adv_params);
    APP_ERROR_CHECK(err_code);

    nrf_gpio_pin_set(ADVERTISING_LED_PIN_NO);
}


/**@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)
{
    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 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)
{
    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.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 handling the Application's BLE Stack events.
 *
 * @param[in]   p_ble_evt   Bluetooth stack event.
 */
static void on_ble_evt(ble_evt_t * p_ble_evt)
{
    uint32_t err_code;

    switch (p_ble_evt->header.evt_id)
    {
        case BLE_GAP_EVT_CONNECTED:
            nrf_gpio_pin_clear(ADVERTISING_LED_PIN_NO);
            m_conn_handle = p_ble_evt->evt.gap_evt.conn_handle;
            break;

        case BLE_GAP_EVT_DISCONNECTED:
            advertising_start();
            break;

        case BLE_GAP_EVT_TIMEOUT:
            if (p_ble_evt->evt.gap_evt.params.timeout.src == BLE_GAP_TIMEOUT_SRC_ADVERTISEMENT)
            {
                nrf_gpio_pin_clear(ADVERTISING_LED_PIN_NO);
                // 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);
            }
            break;

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

/**@brief Function for handling the Application's system events.
 *
 * @param[in]   sys_evt   system event.
 */
static void on_sys_evt(uint32_t sys_evt)
{
    switch(sys_evt)
    {
        case NRF_EVT_FLASH_OPERATION_SUCCESS:
        case NRF_EVT_FLASH_OPERATION_ERROR:
            if (m_memory_access_in_progress)
            {
                m_memory_access_in_progress = false;
                advertising_start();
            }
            break;
        default:
            // No implementation needed.
            break;
    }
}

/**@brief Function for dispatching a BLE stack event to all modules with a BLE stack event handler.
 *
 * @details This function is called from the BLE Stack event interrupt handler after a BLE stack
 *          event has been received.
 *
 * @param[in]   p_ble_evt   Bluetooth stack event.
 */
static void ble_evt_dispatch(ble_evt_t * p_ble_evt)
{
    dm_ble_evt_handler(p_ble_evt);
    ble_wiegand_on_ble_evt(&m_wiegand, p_ble_evt);
    ble_bas_on_ble_evt(&m_bas, p_ble_evt);
    ble_conn_params_on_ble_evt(p_ble_evt);
#ifdef BLE_DFU_APP_SUPPORT
    /** @snippet [Propagating BLE Stack events to DFU Service] */
    ble_dfu_on_ble_evt(&m_dfus, p_ble_evt);
    /** @snippet [Propagating BLE Stack events to DFU Service] */
#endif // BLE_DFU_APP_SUPPORT
    on_ble_evt(p_ble_evt);
}


/**@brief Function for dispatching a system event to interested modules.
 *
 * @details This function is called from the System event interrupt handler after a system
 *          event has been received.
 *
 * @param[in]   sys_evt   System stack event.
 */
static void sys_evt_dispatch(uint32_t sys_evt)
{
    pstorage_sys_event_handler(sys_evt);
    on_sys_evt(sys_evt);
}


/**@brief Function for initializing the BLE stack.
 *
 * @details Initializes the SoftDevice and the BLE event interrupt.
 */
static void ble_stack_init(void)
{
    uint32_t err_code;
    // https://devzone.nordicsemi.com/question/953/what-low-frequency-clock-sources-can-i-use/

    // Initialize the SoftDevice handler module (internal RC oscillator)
    //SOFTDEVICE_HANDLER_INIT(NRF_CLOCK_LFCLKSRC_RC_250_PPM_250MS_CALIBRATION,
    //                        false);

    // Initialize the SoftDevice handler module (external XTAL)
    SOFTDEVICE_HANDLER_INIT(NRF_CLOCK_LFCLKSRC_XTAL_250_PPM,
            false);

#ifdef S110
    // Enable BLE stack
    ble_enable_params_t ble_enable_params;
    memset(&ble_enable_params, 0, sizeof(ble_enable_params));
    ble_enable_params.gatts_enable_params.service_changed = IS_SRVC_CHANGED_CHARACT_PRESENT;
    err_code = sd_ble_enable(&ble_enable_params);
    APP_ERROR_CHECK(err_code);
#endif

    // Register with the SoftDevice handler module for BLE events.
    err_code = softdevice_ble_evt_handler_set(ble_evt_dispatch);
    APP_ERROR_CHECK(err_code);

    // Register with the SoftDevice handler module for BLE events.
    err_code = softdevice_sys_evt_handler_set(sys_evt_dispatch);
    APP_ERROR_CHECK(err_code);
}

/**@brief Function for handling the Device Manager events.
 *
 * @param[in]   p_evt   Data associated to the device manager event.
 */
static uint32_t device_manager_evt_handler(dm_handle_t const    * p_handle,
        dm_event_t const     * p_event,
        api_result_t           event_result)
{
    APP_ERROR_CHECK(event_result);
    return NRF_SUCCESS;
}


/**@brief Function for the Device Manager initialization.
*/
static void device_manager_init(void)
{
    uint32_t                err_code;
    dm_init_param_t         init_data;
    dm_application_param_t  register_param;

    // Initialize persistent storage module.
    err_code = pstorage_init();
    APP_ERROR_CHECK(err_code);

    err_code = dm_init(&init_data);
    APP_ERROR_CHECK(err_code);


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

    register_param.sec_param.timeout      = SEC_PARAM_TIMEOUT;
    register_param.sec_param.bond         = SEC_PARAM_BOND;
    register_param.sec_param.mitm         = SEC_PARAM_MITM;
    register_param.sec_param.io_caps      = SEC_PARAM_IO_CAPABILITIES;
    register_param.sec_param.oob          = SEC_PARAM_OOB;
    register_param.sec_param.min_key_size = SEC_PARAM_MIN_KEY_SIZE;
    register_param.sec_param.max_key_size = SEC_PARAM_MAX_KEY_SIZE;
    register_param.evt_handler            = device_manager_evt_handler;
    register_param.service_type           = DM_PROTOCOL_CNTXT_GATT_SRVR_ID;

    err_code = dm_register(&m_app_handle, &register_param);
    APP_ERROR_CHECK(err_code);
}


/**@brief Function for the Power manager.
*/
static void power_manage(void)
{
    uint32_t err_code = sd_app_evt_wait();
    APP_ERROR_CHECK(err_code);
}


/**@brief Function for application main entry.
*/
Wiegand_ctx wiegand_ctx;
int main(void)
{
    // initialze wiegand context data struct

    // Initialize.
    leds_init();
    timers_init();
    ble_stack_init();
    wiegand_init(&wiegand_ctx);
    device_manager_init();
    gap_params_init();
    advertising_init();
    services_init();
    conn_params_init();

    // Start execution.
    application_timers_start();
    advertising_start();
    adc_init();

    printf("init done!\n");

    // Enter main loop.
    for (;;)
    {
        wiegand_task();
        // number of cards over the maximum that we can transmit
        uint16_t num_skip = 0;
        if (wiegand_ctx.card_count > BLE_MAX_CARDS) {
            num_skip = wiegand_ctx.card_count - BLE_MAX_CARDS;
        }
        // number of bytes to transmit over BLE
        uint16_t tx_len = wiegand_ctx.card_count * sizeof(Card);
        if (tx_len > BLE_MAX_TX_LEN) {
            tx_len = BLE_MAX_TX_LEN;
        }

        // load cards for transmission
        ble_wiegand_last_cards_set(&m_wiegand,
                (uint8_t *)&(wiegand_ctx.card_store[num_skip]),
                tx_len);
        power_manage();
    }
}