text: /**
   * Copyright (c) 2014 - 2018, Nordic Semiconductor ASA
   *
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without modification,
   * are permitted provided that the following conditions are met:
   *
   * 1. Redistributions of source code must retain the above copyright notice, this
   *    list of conditions and the following disclaimer.
   *
   * 2. Redistributions in binary form, except as embedded into a Nordic
   *    Semiconductor ASA integrated circuit in a product or a software update for
   *    such product, must reproduce the above copyright notice, this list of
   *    conditions and the following disclaimer in the documentation and/or other
   *    materials provided with the distribution.
   *
   * 3. Neither the name of Nordic Semiconductor ASA nor the names of its
   *    contributors may be used to endorse or promote products derived from this
   *    software without specific prior written permission.
   *
   * 4. This software, with or without modification, must only be used with a
   *    Nordic Semiconductor ASA integrated circuit.
   *
   * 5. Any software provided in binary form under this license must not be reverse
   *    engineered, decompiled, modified and/or disassembled.
   *
   * THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS
   * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   * OF MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE ARE
   * DISCLAIMED. IN NO EVENT SHALL NORDIC SEMICONDUCTOR ASA OR CONTRIBUTORS BE
   * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
   * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
   * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   *
   */
  #include "bsp_btn_ble.h"
  #include "nrf_sdh_ble.h"
  #include "bsp.h"
  
  #define BTN_ID_WAKEUP             0  /**< ID of button used to wake up the application. */
  #define BTN_ID_SLEEP              0  /**< ID of button used to put the application into sleep mode. */
  #define BTN_ID_DISCONNECT         0  /**< ID of button used to gracefully terminate a connection on long press. */
  #define BTN_ID_WAKEUP_BOND_DELETE 1  /**< ID of button used to wake up the application and delete all bonding information. */
  #define BTN_ID_WHITELIST_OFF      1  /**< ID of button used to turn off usage of the whitelist. */
  
  #define BTN_ACTION_SLEEP          BSP_BUTTON_ACTION_RELEASE    /**< Button action used to put the application into sleep mode. */
  #define BTN_ACTION_DISCONNECT     BSP_BUTTON_ACTION_LONG_PUSH  /**< Button action used to gracefully terminate a connection on long press. */
  #define BTN_ACTION_WHITELIST_OFF  BSP_BUTTON_ACTION_LONG_PUSH  /**< Button action used to turn off usage of the whitelist. */
  
  /**@brief This macro will return from the current function if err_code
   *        is not NRF_SUCCESS or NRF_ERROR_INVALID_PARAM.
   */
  #define RETURN_ON_ERROR_NOT_INVALID_PARAM(err_code)                             \
  do                                                                              \
  {                                                                               \
      if (((err_code) != NRF_SUCCESS) && ((err_code) != NRF_ERROR_INVALID_PARAM)) \
      {                                                                           \
          return err_code;                                                        \
      }                                                                           \
  }                                                                               \
  while (0)
  
  
  /**@brief This macro will return from the current function if err_code
   *        is not NRF_SUCCESS or NRF_ERROR_NOT_SUPPORTED.
   */
  #define RETURN_ON_ERROR_NOT_NOT_SUPPORTED(err_code)                             \
  do                                                                              \
  {                                                                               \
      if (((err_code) != NRF_SUCCESS) && ((err_code) != NRF_ERROR_NOT_SUPPORTED)) \
      {                                                                           \
          return err_code;                                                        \
      }                                                                           \
  }                                                                               \
  while (0)
  
  
  /**@brief This macro will call the registered error handler if err_code
   *        is not NRF_SUCCESS and the error handler is not NULL.
   */
  #define CALL_HANDLER_ON_ERROR(err_code)                           \
  do                                                                \
  {                                                                 \
      if (((err_code) != NRF_SUCCESS) && (m_error_handler != NULL)) \
      {                                                             \
          m_error_handler(err_code);                                \
      }                                                             \
  }                                                                 \
  while (0)
  
  
  static bsp_btn_ble_error_handler_t m_error_handler = NULL; /**< Error handler registered by the user. */
  static uint32_t                    m_num_connections = 0;  /**< Number of connections the device is currently in. */
  
  
  /**@brief Function for configuring the buttons for connection.
   *
   * @retval NRF_SUCCESS  Configured successfully.
   * @return A propagated error code.
   */
  static uint32_t connection_buttons_configure()
  {
      uint32_t err_code;
  
      err_code = bsp_event_to_button_action_assign(BTN_ID_SLEEP,
                                                   BTN_ACTION_SLEEP,
                                                   BSP_EVENT_DEFAULT);
      RETURN_ON_ERROR_NOT_INVALID_PARAM(err_code);
  
      err_code = bsp_event_to_button_action_assign(BTN_ID_WHITELIST_OFF,
                                                   BTN_ACTION_WHITELIST_OFF,
                                                   BSP_EVENT_WHITELIST_OFF);
      RETURN_ON_ERROR_NOT_INVALID_PARAM(err_code);
  
  
      err_code = bsp_event_to_button_action_assign(BTN_ID_DISCONNECT,
                                                   BTN_ACTION_DISCONNECT,
                                                   BSP_EVENT_DISCONNECT);
      RETURN_ON_ERROR_NOT_INVALID_PARAM(err_code);
  
      return NRF_SUCCESS;
  }
  
  
  /**@brief Function for configuring the buttons for advertisement.
   *
   * @retval NRF_SUCCESS  Configured successfully.
   * @return A propagated error code.
   */
  static uint32_t advertising_buttons_configure()
  {
      uint32_t err_code;
  
      err_code = bsp_event_to_button_action_assign(BTN_ID_DISCONNECT,
                                                   BTN_ACTION_DISCONNECT,
                                                   BSP_EVENT_DEFAULT);
      RETURN_ON_ERROR_NOT_INVALID_PARAM(err_code);
  
      err_code = bsp_event_to_button_action_assign(BTN_ID_WHITELIST_OFF,
                                                   BTN_ACTION_WHITELIST_OFF,
                                                   BSP_EVENT_WHITELIST_OFF);
      RETURN_ON_ERROR_NOT_INVALID_PARAM(err_code);
  
      err_code = bsp_event_to_button_action_assign(BTN_ID_SLEEP,
                                                   BTN_ACTION_SLEEP,
                                                   BSP_EVENT_SLEEP);
      RETURN_ON_ERROR_NOT_INVALID_PARAM(err_code);
  
      return NRF_SUCCESS;
  }
  
  
  /**@brief Function for extracting the BSP event valid at startup.
   *
   * @details When a button was used to wake up the device, the button press will not generate an
   *          interrupt. This function reads which button was pressed at startup, and returns the
   *          appropriate BSP event.
   *
   * @param[out] p_startup_event  Where to put the extracted BSP event.
   */
  static void startup_event_extract(bsp_event_t * p_startup_event)
  {
      // React to button states
      if (bsp_button_is_pressed(BTN_ID_WAKEUP_BOND_DELETE))
      {
          *p_startup_event = BSP_EVENT_CLEAR_BONDING_DATA;
      }
      else if (bsp_button_is_pressed(BTN_ID_WAKEUP))
      {
          *p_startup_event = BSP_EVENT_WAKEUP;
      }
      else
      {
          *p_startup_event = BSP_EVENT_NOTHING;
      }
  }
  
  
  uint32_t bsp_btn_ble_sleep_mode_prepare(void)
  {
      uint32_t err_code;
  
      err_code = bsp_wakeup_button_enable(BTN_ID_WAKEUP);
      RETURN_ON_ERROR_NOT_NOT_SUPPORTED(err_code);
  
      err_code = bsp_wakeup_button_enable(BTN_ID_WAKEUP_BOND_DELETE);
      RETURN_ON_ERROR_NOT_NOT_SUPPORTED(err_code);
  
      return NRF_SUCCESS;
  }
  
  
  /**
   * @brief Function for handling BLE events.
   *
   * @param[in]   p_ble_evt       Event received from the BLE stack.
   * @param[in]   p_context       Context.
   */
  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:
              if (m_num_connections == 0)
              {
                  err_code = connection_buttons_configure();
                  CALL_HANDLER_ON_ERROR(err_code);
              }
  
              m_num_connections++;
              break;
  
          case BLE_GAP_EVT_DISCONNECTED:
              m_num_connections--;
  
              if (m_num_connections == 0)
              {
                  err_code = advertising_buttons_configure();
                  CALL_HANDLER_ON_ERROR(err_code);
              }
              break;
  
          default:
              break;
      }
  }
  
  NRF_SDH_BLE_OBSERVER(m_ble_observer, BSP_BTN_BLE_OBSERVER_PRIO, ble_evt_handler, NULL);
  
  
  uint32_t bsp_btn_ble_init(bsp_btn_ble_error_handler_t error_handler, bsp_event_t * p_startup_bsp_evt)
  {
      uint32_t err_code = NRF_SUCCESS;
  
      m_error_handler = error_handler;
  
      if (p_startup_bsp_evt != NULL)
      {
          startup_event_extract(p_startup_bsp_evt);
      }
  
      if (m_num_connections == 0)
      {
          err_code = advertising_buttons_configure();
      }
  
      return err_code;
  }
  