/**
  @page WWDG_RefreshUntilUserEvent WWDG example
  
  @verbatim
  ******************** (C) COPYRIGHT 2016 STMicroelectronics *******************
  * @file    Examples_LL/WWDG/WWDG_RefreshUntilUserEvent/readme.txt 
  * @author  MCD Application Team
  * @brief   Description of the WWDG_RefreshUntilUserEvent example.
  ******************************************************************************
  *
  * 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 STMicroelectronics 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.
  *
  ******************************************************************************
  @endverbatim

@par Example Description

This example describes how to configure WWDG and update counter at regular period 
and generating an MCU WWDG reset at User Button pressed. Peripheral initialization 
done using LL unitary services functions for optimization purpose (performance and size).

Example Configuration:
Configure the WWDG (Window, Prescaler & Counter) and enable it.
Refresh the WWDG downcounter in the main loop - Led is blinking fastly & continuously

Example Execution:
When User Button is pressed, the Downcounter automatic refresh mechanism is disable and thus, reset will occur.
After a reset when re-entering in the main, RCC WWDG Reset Flag will be checked and if we are back from a WWDG reset the led will be switch ON.

Waiting a new user button pressed to re-activate the WWDG

@par Directory contents 

  - WWDG/WWDG_RefreshUntilUserEvent/Inc/stm32f0xx_it.h          Interrupt handlers header file
  - WWDG/WWDG_RefreshUntilUserEvent/Inc/main.h                  Header for main.c module
  - WWDG/WWDG_RefreshUntilUserEvent/Inc/stm32_assert.h          Template file to include assert_failed function
  - WWDG/WWDG_RefreshUntilUserEvent/Src/stm32f0xx_it.c          Interrupt handlers
  - WWDG/WWDG_RefreshUntilUserEvent/Src/main.c                  Main program
  - WWDG/WWDG_RefreshUntilUserEvent/Src/system_stm32f0xx.c      STM32F0xx system source file


@par Hardware and Software environment

  - This example runs on STM32F072xB devices.
    
  - This example has been tested with STM32F072RB-Nucleo RevC board and can be
    easily tailored to any other supported device and development board.


@par How to use it ? 

In order to make the program work, you must do the following :
 - Open your preferred toolchain
 - Rebuild all files and load your image into target memory
 - Run the example

 * <h3><center>&copy; COPYRIGHT STMicroelectronics</center></h3>
 */
