text: /*
   *
   *    Copyright (c) 2018 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.
   */
  
  #include "LEDWidget.h"
  #include "AppTask.h"
  #include <platform/CHIPDeviceLayer.h>
  
  void LEDWidget::Init(gpio_num_t gpioNum)
  {
      mLastChangeTimeUS = 0;
      mBlinkOnTimeMS    = 0;
      mBlinkOffTimeMS   = 0;
      mGPIONum          = gpioNum;
  
      if (gpioNum < GPIO_NUM_MAX)
      {
          gpio_set_direction(gpioNum, GPIO_MODE_OUTPUT);
      }
  }
  
  void LEDWidget::Invert(void)
  {
      Set(!mState);
  }
  
  void LEDWidget::Set(bool state)
  {
      mBlinkOnTimeMS  = 0;
      mBlinkOffTimeMS = 0;
      DoSet(state);
  }
  
  void LEDWidget::Blink(uint32_t changeRateMS)
  {
      Blink(changeRateMS, changeRateMS);
  }
  
  void LEDWidget::Blink(uint32_t onTimeMS, uint32_t offTimeMS)
  {
      mBlinkOnTimeMS  = onTimeMS;
      mBlinkOffTimeMS = offTimeMS;
      Animate();
  }
  
  void LEDWidget::Animate()
  {
      if (mBlinkOnTimeMS != 0 && mBlinkOffTimeMS != 0)
      {
          chip::System::Clock::MonotonicMicroseconds nowUS            = chip::System::SystemClock().GetMonotonicMicroseconds();
          chip::System::Clock::MonotonicMicroseconds stateDurUS       = ((mState) ? mBlinkOnTimeMS : mBlinkOffTimeMS) * 1000LL;
          chip::System::Clock::MonotonicMicroseconds nextChangeTimeUS = chip::System::Clock::AddOffset(mLastChangeTimeUS, stateDurUS);
  
          if (chip::System::Clock::IsEarlier(nextChangeTimeUS, nowUS))
          {
              DoSet(!mState);
              mLastChangeTimeUS = nowUS;
          }
      }
  }
  
  void LEDWidget::DoSet(bool state)
  {
      mState = state;
      if (mGPIONum < GPIO_NUM_MAX)
      {
          gpio_set_level(mGPIONum, (state) ? 1 : 0);
      }
  }
  