/**
  @page DMA_ADC_TIM2 ADC DMA transfer to TIM2 example
  
  @verbatim
  ******************** (C) COPYRIGHT 2012 STMicroelectronics *******************
  * @file    DMA/ADC_TIM2/readme.txt 
  * @author  MCD Application Team
  * @version V1.1.1
  * @date    13-April-2012
  * @brief   Description of the ADC DMA transfer to TIM2 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 provides a description of how to use a DMA channel to transfer
continuously a data from a peripheral (ADC1) to another peripheral (TIM2) supporting
DMA transfer.The ADC channel18 ( when using the STM32L152-EVAL) or ADC channel31 
(when using the STM32L152D-EVAL) is configured to be converted continuously. 
TIM2_CH1 is configured to generate a PWM signal on its output.
The dedicated DMA1 channel2 is configured to transfer in circular mode the last ADC 
channel18/31 converted value to the TIM2_CCR1 register. The DMA channel request is driven
by the TIM2 update event. The duty cycle of TIM2_CH1 output signal is then changed
each time the input voltage value on ADC channel18/31 pin is modified.
The duty cycle variation can be visualized on oscilloscope on the TIM2_CH1 pin
PA.00 while changing the analog input on ADC channel18/31 using the potentiometer.

@par Directory contents 

  - DMA/ADC_TIM2/stm32l1xx_conf.h    Library Configuration file
  - DMA/ADC_TIM2/stm32l1xx_it.c      Interrupt handlers
  - DMA/ADC_TIM2/stm32l1xx_it.h      Interrupt handlers header file
  - DMA/ADC_TIM2/main.c              Main program
  - DMA/ADC_TIM2/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 ADC Channel18 mapped on pin 
      PB.12 (potentiometer RV3)
    - Connect an oscilloscope to TIM2_CH1 (PA.00) pin.


  - STM32L152D-EVAL Set-up
    - Connect a variable power supply 0-3.3V to ADC Channel31 mapped on pin 
      PF.10 (potentiometer RV3)
    - Connect an oscilloscope to TIM2_CH1 (PA.00) pin.

@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>
 */


