text: /*
   * Copyright (c) 2015-2021 University of Antwerp, Aloxy NV.
   *
   * This file is part of Sub-IoT.
   * See https://github.com/Sub-IoT/Sub-IoT-Stack for further info.
   *
   * 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 stm32_common_atomic.c
   *
   *
   */
  
  #include "hwatomic.h"
  #include "stm32_device.h"
  
  static volatile uint8_t nests = 0;
  
  void start_atomic()
  {  
    if(nests == 0)
      __disable_irq();
    ++nests;
  }
  
  void end_atomic()
  {
    if(nests == 0)
      return;
    --nests;
    if(nests == 0)
      __enable_irq();
  }
  
  _Bool in_atomic()
  {
    return (nests > 0);
  }
  