text: /* mbed Microcontroller Library
   * Copyright (c) 2015-2018 ARM Limited and affiliates.
   * SPDX-License-Identifier: Apache-2.0
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  #ifndef COMMON_RTC_H
  #define COMMON_RTC_H
  
  #include "nrf_rtc.h"
  
  #define RTC_COUNTER_BITS        24u
  #define RTC_FREQ                32768u
  
  // Instance 0 is reserved for SoftDevice.
  // Instance 1 is used as a common one for lp_ticker and (in case
  // of NRF51) as an alternative tick source for RTOS.
  #define COMMON_RTC_INSTANCE     NRF_RTC1
  #define COMMON_RTC_IRQ_HANDLER  RTC1_IRQHandler
  #define OS_TICK_CC_CHANNEL      0
  #define LP_TICKER_CC_CHANNEL    1
  
  #define COMMON_RTC_EVENT_COMPARE(channel) \
      CONCAT_2(NRF_RTC_EVENT_COMPARE_, channel)
  #define COMMON_RTC_INT_COMPARE_MASK(channel) \
      CONCAT_3(NRF_RTC_INT_COMPARE, channel, _MASK)
  
  #define OS_TICK_EVENT       COMMON_RTC_EVENT_COMPARE(OS_TICK_CC_CHANNEL)
  #define OS_TICK_INT_MASK    COMMON_RTC_INT_COMPARE_MASK(OS_TICK_CC_CHANNEL)
  #define LP_TICKER_EVENT     COMMON_RTC_EVENT_COMPARE(LP_TICKER_CC_CHANNEL)
  #define LP_TICKER_INT_MASK  COMMON_RTC_INT_COMPARE_MASK(LP_TICKER_CC_CHANNEL)
  
  extern bool              m_common_rtc_enabled;
  extern uint32_t volatile m_common_rtc_overflows;
  extern bool volatile     lp_ticker_interrupt_fire;
  
  void     common_rtc_free(void);
  void     common_rtc_init(void);
  uint32_t common_rtc_32bit_ticks_get(void);
  uint64_t common_rtc_64bit_us_get(void);
  void     common_rtc_set_interrupt(uint32_t us_timestamp, uint32_t cc_channel,
                                    uint32_t int_mask);
  
  #endif // COMMON_RTC_H
  