/**
  @page GPIO_IOToggle GPIO IO Toggle example
  
  @verbatim
  ******************** (C) COPYRIGHT 2014 STMicroelectronics *******************
  * @file    Demonstrations/LED_Blinking/readme.txt 
  * @author  MCD Application Team
  * @version $VERSION$
  * @date    $DATE$
  * @brief   Description of the STM32L100C-Discovery Demonstration firmware.
  ******************************************************************************
  *
  * 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 demonstration will use USER button, LED3 & LED4 available on the board.

At the beginning of the main program the HAL_Init() function is called to reset 
all the peripherals, initialize the Flash interface and the systick.
Then the SystemClock_Config() function is used to configure the system
clock (SYSCLK) to run at 32 MHz.

Each time user will press USER push-button, LEDs programmation will be done.
1) LED3 blinking every 200ms
2) press button, LED4 ON during 1s and then off
3) LED3 blinking every 100ms
4) press button, LED4 ON during 1s and then off
5) LED3 OFF
6) press button, LED4 ON during 1s and then off => go to step 1)

@note The application need to ensure that the SysTick time base is always set to 1 millisecond
      to have correct HAL operation.

@par Directory contents 

  - Demonstrations/LED_Blinking/Inc/stm32l1xx_hal_conf.h    HAL configuration file
  - Demonstrations/LED_Blinking/Inc/stm32l1xx_it.h          Interrupt handlers header file
  - Demonstrations/LED_Blinking/Inc/main.h                  Header for main.c module  
  - Demonstrations/LED_Blinking/Src/stm32l1xx_it.c          Interrupt handlers
  - Demonstrations/LED_Blinking/Src/main.c                  Main program
  - Demonstrations/LED_Blinking/Src/system_stm32l1xx.c      STM32L1xx system source file
  - Demonstrations/LED_Blinking/Binary/STM32L100C_Discovery_Demo_V1.0.0.hex      STM32L100C-Discovery Demonstration
firmware


@par Hardware and Software environment

  - This example runs on STM32L100xC devices.
    
  - Connect the STM32L100C-Discovery board to a PC with a 'USB type A to Mini-B'
    cable through USB connector CN1 to power the board.
    
  - Make sure that the embedded ST-LINK/V2 is configured for in-system programming
    (both CN3 jumpers ON)
    
  - Use "STM32L100C_Discovery_Demo_V1.0.0.hex" binary with your preferred 
    in-system programming tool to reprogram the demonstration firmware 
    (ex. STM32 ST-LINK Utility, available for download from www.st.com).


@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>
 */
