/**
  @page ADC_ADC1_AnalogWatchdog ADC Analog Watchdog example
  
  @verbatim
  ******************** (C) COPYRIGHT 2012 STMicroelectronics *******************
  * @file    ADC/ADC1_AnalogWatchdog/readme.txt 
  * @author  MCD Application Team
  * @version V1.1.1
  * @date    13-April-2012
  * @brief   Description of the ADC Analog Watchdog example.
  ******************************************************************************
  *
  * Licensed under MCD-ST Liberty SW License Agreement V2, (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.st.com/software_license_agreement_liberty_v2
  *
  * 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.
  *
  ******************************************************************************
   @endverbatim

@par Example Description 

This example describes how to use the ADC analog watchdog to guard continuously  
an ADC channel.
The ADC1 is configured to convert continuously ADC channel18 when using the
STM32L152-EVAL or ADC channel31 when using the STM32L152D-EVAL.
The analog watchdog is configured and enabled to guard a single regular channel.
Each time the channel18/31 converted value exceeds programmed analog watchdog high 
threshold (value 0xE8B) or goes down analog watchdog low threshold (value 0x26D)
an AWD interrupt is generated and the output pin connected to LED1 is toggled. The
LED will bright as long as the AWD interrupt is generated which means that the 
converted value of regular ADC channel18/31 is outside the range limited by high and 
low analog watchdog thresholds.

@note that ADC channel18/31 is connected to a potentiometer (RV3) which can deliver 
a voltage between 0V and 3.3V.

Since ADC_Vref+ = 3.3V and ADC_Vref- = 0V, the low analog watchdog threshold, 
0x26D, corresponds to 0.500V (0x26D * 3.300V / 0xFFF) and the High analog watchdog 
threshold,0xE8B, corresponds to 3.000V (0xE8B * 3.300V / 0xFFF). 
The ADC1 clock is set to HSI (16MHz).

@par Directory contents 

  - ADC/ADC1_AnalogWatchdog/stm32l1xx_conf.h    Library Configuration file
  - ADC/ADC1_AnalogWatchdog/stm32l1xx_it.c      Interrupt handlers
  - ADC/ADC1_AnalogWatchdog/stm32l1xx_it.h      Interrupt handlers header file
  - ADC/ADC1_AnalogWatchdog/main.c              Main program
  - ADC/ADC1_AnalogWatchdog/system_stm32l1xx.c  STM32L1xx system source file
  
@note The "system_stm32l1xx.c" is generated by an automatic clock configuration 
      system and can be easily customized to your own configuration. 
      To select different clock setup, use the "STM32L1xx_Clock_Configuration_V1.1.0.xls" 
      provided with the AN3309 package available on <a href="http://www.st.com/internet/mcu/family/141.jsp">  ST Microcontrollers </a>
         
@par Hardware and Software environment

  - This example runs on STM32L1xx Ultra Low Power High-, Medium-Density and Medium-Density Plus Devices.
  
  - This example has been tested with STMicroelectronics STM32L152D-EVAL (STM32L1xx 
    Ultra Low Power High-Density) and STM32L152-EVAL (STM32L1xx Ultra Low 
    Power Medium-Density) evaluation board and can be easily tailored to any 
    other supported device and development board.

  - STM32L152-EVAL Set-up
    - Use LED1 led connected to PD.00 pin
    - Connect a variable power supply 0-3.3V to ADC Channel18 mapped on pin PB.12
      (potentiometer RV3) 
    - Make sure that the Jumper JP17 is in PB12 position.

  - STM32L152D-EVAL Set-up
    - Use LED1 led connected to PD.03 pin
    - Connect a variable power supply 0-3.3V to ADC Channel31 mapped on pin PF.10
      (potentiometer RV3) 
    - Make sure that the Jumper JP13 is in PF10 position.

@par How to use it ? 

In order to make the program work, you must do the following :
 - Copy all source files from this example folder to the template folder under
   Project\STM32L1xx_StdPeriph_Templates
 - Open your preferred toolchain 
 - Rebuild all files and load your image into target memory
 - Run the example

@note
- Ultra Low Power Medium-density devices are STM32L151xx and STM32L152xx 
  microcontrollers where the Flash memory density ranges between 64 and 128 Kbytes.
- Ultra Low Power Medium-density Plus devices are STM32L151xx, STM32L152xx and 
  STM32L162xx microcontrollers where the Flash memory density is 256 Kbytes.
- Ultra Low Power High-density devices are STM32L151xx, STM32L152xx and STM32L162xx 
  microcontrollers where the Flash memory density is 384 Kbytes.
    
 * <h3><center>&copy; COPYRIGHT STMicroelectronics</center></h3>
 */


