text: /*
   *  Copyright (c) 2017, The OpenThread Authors.
   *  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 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 the copyright holder nor the
   *     names of its contributors may be used to endorse or promote products
   *     derived from this software without specific prior written permission.
   *
   *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
   *  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   *  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   *  ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER 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 <driverlib/aon_rtc.h>
  #include <stdbool.h>
  #include <stdint.h>
  
  #include <openthread/platform/alarm-milli.h>
  #include <openthread/platform/diag.h>
  
  /**
   * /NOTE: we could use systick, but that would sacrifice atleast a few ops
   * every ms, and not run when the processor is sleeping.
   */
  
  static uint32_t sTime0     = 0;
  static uint32_t sAlarmTime = 0;
  static bool     sIsRunning = false;
  
  /**
   * Function documented in platform-cc2650.h
   */
  void cc2650AlarmInit(void)
  {
      /*
       * NOTE: this will not enable the individual rtc alarm channels
       */
      AONRTCEnable();
      sIsRunning = true;
  }
  
  /**
   * Function documented in platform/alarm-milli.h
   */
  uint32_t otPlatAlarmMilliGetNow(void)
  {
      /*
       * This is current value of RTC as it appears in the register.
       * With seconds as the upper 32 bytes and fractions of a second as the
       * lower 32 bytes <32.32>.
       */
      uint64_t rtcVal = AONRTCCurrent64BitValueGet();
      return ((rtcVal * 1000) >> 32);
  }
  
  /**
   * Function documented in platform/alarm-milli.h
   */
  void otPlatAlarmMilliStartAt(otInstance *aInstance, uint32_t aT0, uint32_t aDt)
  {
      OT_UNUSED_VARIABLE(aInstance);
  
      sTime0     = aT0;
      sAlarmTime = aDt;
      sIsRunning = true;
  }
  
  /**
   * Function documented in platform/alarm-milli.h
   */
  void otPlatAlarmMilliStop(otInstance *aInstance)
  {
      OT_UNUSED_VARIABLE(aInstance);
      sIsRunning = false;
  }
  
  /**
   * Function documented in platform-cc2650.h
   */
  void cc2650AlarmProcess(otInstance *aInstance)
  {
      uint32_t offsetTime;
  
      if (sIsRunning)
      {
          /* unsinged subtraction will result in the absolute offset */
          offsetTime = otPlatAlarmMilliGetNow() - sTime0;
  
          if (sAlarmTime <= offsetTime)
          {
              sIsRunning = false;
  #if OPENTHREAD_CONFIG_DIAG_ENABLE
  
              if (otPlatDiagModeGet())
              {
                  otPlatDiagAlarmFired(aInstance);
              }
              else
  #endif /* OPENTHREAD_CONFIG_DIAG_ENABLE */
              {
                  otPlatAlarmMilliFired(aInstance);
              }
          }
      }
  }
  