text: /*
   *
   *    Copyright (c) 2020 Project CHIP Authors
   *    Copyright (c) 2020 Nest Labs, Inc.
   *    All rights reserved.
   *
   *    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.
   */
  
  /**
   *    @file
   *          Provides an implementation of the PlatformManager object
   *          for K32W platforms using the NXP K32W SDK.
   */
  /* this file behaves like a config.h, comes first */
  #include <platform/internal/CHIPDeviceLayerInternal.h>
  
  #include <crypto/CHIPCryptoPAL.h>
  #include <platform/PlatformManager.h>
  #include <platform/internal/GenericPlatformManagerImpl_FreeRTOS.cpp>
  
  #include <lwip/tcpip.h>
  
  #include <openthread/platform/entropy.h>
  
  namespace chip {
  namespace DeviceLayer {
  
  PlatformManagerImpl PlatformManagerImpl::sInstance;
  
  static int app_entropy_source(void * data, unsigned char * output, size_t len, size_t * olen)
  {
      otError otErr = otPlatEntropyGet(output, (uint16_t) len);
  
      if (otErr != OT_ERROR_NONE)
      {
          return -1;
      }
  
      *olen = len;
      return 0;
  }
  
  CHIP_ERROR PlatformManagerImpl::_InitChipStack(void)
  {
      CHIP_ERROR err;
  
      // Initialize the configuration system.
      err = Internal::K32WConfig::Init();
      SuccessOrExit(err);
  
      // Initialize LwIP.
      tcpip_init(NULL, NULL);
  
      // Call _InitChipStack() on the generic implementation base class
      // to finish the initialization process.
      err = Internal::GenericPlatformManagerImpl_FreeRTOS<PlatformManagerImpl>::_InitChipStack();
      SuccessOrExit(err);
  
      err = chip::Crypto::add_entropy_source(app_entropy_source, NULL, 16);
      SuccessOrExit(err);
  
  exit:
      return err;
  }
  
  } // namespace DeviceLayer
  } // namespace chip
  