/**
  @page DAC_ADC Loopback DAC to ADC example
  
  @verbatim
  ******************** (C) COPYRIGHT 2012 STMicroelectronics *******************
  * @file    DAC/DAC_ADC/readme.txt 
  * @author  MCD Application Team
  * @version V1.1.1
  * @date    13-April-2012
  * @brief   Description of the Loopback DAC to ADC 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 ADC1 and DAC to output on DAC_OUT1 sampled
values of ADC1.
The ADC1 is configured to convert continuously ADC1 channel18 (PB12) for STM32L152-EVAL 
or ADC1 channel31 (PF10) for STM32L152D-EVAL . The End Of Conversion (EOC) interrupt 
is enabled and the conversion is triggered by software.

The DAC channel 1 is configured with output buffer enabled.

Each time the end of conversion interrupt occurs, converted value by ADC1 is written
in DAC channel 1 register.
Thus applied voltage on ADC1 channel18/31 (PB12/PF10) is outputted on DAC_OUT1 (PA4).

@par Directory contents 

  - DAC/DAC_ADC/stm32l1xx_conf.h    Library Configuration file
  - DAC/DAC_ADC/stm32l1xx_it.c      Interrupt handlers
  - DAC/DAC_ADC/stm32l1xx_it.h      Interrupt handlers header file
  - DAC/DAC_ADC/main.c              Main program
  - DAC/DAC_ADC/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
    - Connect a variable power supply 0-3.3V to ADC1 Channel18 mapped on pin PB.12
      (potentiometer RV3 can be used).
    @note Make sure that the Jumper JP17 is in PB12 position in case of using RV3.  
    - Connect PA4 (DAC_OUT1) pin to an oscilloscope.

  - STM32L152D-EVAL Set-up
    - Connect a variable power supply 0-3.3V to ADC1 Channel31 mapped on pin PF.10
      (potentiometer RV3 can be used).
    @note Make sure that the Jumper JP13 is in ADC position in case of using RV3.  
    - Connect PA4 (DAC_OUT1) pin to an oscilloscope.
    
@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>
 */


