text: /**
   * Copyright (c) 2016 - 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 <stdbool.h>
  #include <stdint.h>
  #include <string.h>
  #include "es_stopwatch.h"
  #include "sdk_macros.h"
  #include "app_timer.h"
  #include "es_app_config.h"
  
  static uint32_t m_ticks_last_returned[ES_STOPWATCH_MAX_USERS];
  static uint32_t m_ids_ticks_wrap[ES_STOPWATCH_MAX_USERS];
  static uint8_t  m_nof_ids     = 0;
  static bool     m_initialized = false;
  
  uint32_t es_stopwatch_check(es_stopwatch_id_t id)
  {
      uint32_t ticks_current = app_timer_cnt_get();
      uint32_t ticks_diff;
  
      if (m_ids_ticks_wrap[id] == 0)
      {
          APP_ERROR_CHECK(NRF_ERROR_INVALID_STATE);
      }
  
      ticks_diff = app_timer_cnt_diff_compute(ticks_current, m_ticks_last_returned[id]);
  
      if (ticks_diff >= m_ids_ticks_wrap[id])
      {
          m_ticks_last_returned[id] = (ticks_current / m_ids_ticks_wrap[id]) * m_ids_ticks_wrap[id];
  
          return ticks_diff / m_ids_ticks_wrap[id];
      }
  
      return 0;
  }
  
  ret_code_t es_stopwatch_create(es_stopwatch_id_t * p_sw_id, uint32_t ticks_wrap)
  {
      VERIFY_PARAM_NOT_NULL(p_sw_id);
  
      if (m_nof_ids == ES_STOPWATCH_MAX_USERS)
      {
          return NRF_ERROR_INVALID_STATE;
      }
  
      if (!m_initialized)
      {
          return NRF_ERROR_MODULE_NOT_INITIALIZED;
      }
  
      *p_sw_id = m_nof_ids;
  
      m_ids_ticks_wrap[m_nof_ids] = ticks_wrap;
  
      m_nof_ids++;
  
      return NRF_SUCCESS;
  }
  
  
  void es_stopwatch_init(void)
  {
      m_nof_ids = 0;
      memset(m_ticks_last_returned, 0, sizeof(m_ticks_last_returned));
      memset(m_ids_ticks_wrap, 0, sizeof(m_ids_ticks_wrap));
      m_initialized = true;
  }
  