text: /*
   *  Copyright (c) 2019, 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.
   */
  
  /**
   * @file
   *   This file implements the OpenThread platform abstraction for miscellaneous behaviors.
   */
  
  #include <openthread/platform/misc.h>
  
  #include "em_rmu.h"
  #include "platform-efr32.h"
  
  static uint32_t sResetCause;
  
  void efr32MiscInit(void)
  {
      // Read the cause of last reset.
      sResetCause = RMU_ResetCauseGet();
  
      // Clear the register, as the causes cumulate over resets.
      RMU_ResetCauseClear();
  }
  
  void otPlatReset(otInstance *aInstance)
  {
      OT_UNUSED_VARIABLE(aInstance);
      NVIC_SystemReset();
  }
  
  otPlatResetReason otPlatGetResetReason(otInstance *aInstance)
  {
      OT_UNUSED_VARIABLE(aInstance);
  
      otPlatResetReason reason;
  
      if (sResetCause & EMU_RSTCAUSE_POR)
      {
          reason = OT_PLAT_RESET_REASON_POWER_ON;
      }
      else if (sResetCause & EMU_RSTCAUSE_SYSREQ)
      {
          reason = OT_PLAT_RESET_REASON_SOFTWARE;
      }
      else if ((sResetCause & EMU_RSTCAUSE_WDOG0) || (sResetCause & EMU_RSTCAUSE_WDOG1))
      {
          reason = OT_PLAT_RESET_REASON_WATCHDOG;
      }
      else if (sResetCause & EMU_RSTCAUSE_PIN)
      {
          reason = OT_PLAT_RESET_REASON_EXTERNAL;
      }
      else if (sResetCause & EMU_RSTCAUSE_LOCKUP)
      {
          reason = OT_PLAT_RESET_REASON_FAULT;
      }
      else if ((sResetCause & EMU_RSTCAUSE_AVDDBOD) || (sResetCause & EMU_RSTCAUSE_DECBOD) ||
               (sResetCause & EMU_RSTCAUSE_DVDDBOD) || (sResetCause & EMU_RSTCAUSE_DVDDLEBOD) ||
               (sResetCause & EMU_RSTCAUSE_EM4))
      {
          reason = OT_PLAT_RESET_REASON_ASSERT;
      }
      else
      {
          reason = OT_PLAT_RESET_REASON_UNKNOWN;
      }
  
      return reason;
  }
  
  void otPlatWakeHost(void)
  {
      // TODO: implement an operation to wake the host from sleep state.
  }
  