/**
  @page ADC_SingleConversion_TriggerSW_DMA ADC example
  
  @verbatim
  ******************** (C) COPYRIGHT 2016 STMicroelectronics *******************
  * @file    Examples_LL/ADC/ADC_SingleConversion_TriggerSW_DMA/readme.txt 
  * @author  MCD Application Team
  * @version V1.0.0
  * @date    14-April-2017
  * @brief   Description of the ADC_SingleConversion_TriggerSW_DMA 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 use an ADC peripheral to
perform a single ADC channel conversion at each
software start. It uses the DMA transfer programming
model (for details on polling or interrupt programming
models, refer to other examples). This example is based
on the STM32F1xx ADC LL API. The peripheral
initialization is done using LL unitary services functions for
optimization purpose (performance and size).

Example configuration:
ADC is configured to convert a single channel, in single conversion mode,
from SW trigger.
DMA is configured to transfer conversion data in an array, in circular mode.
Note: In this example, array size can be set to 1 (equivalent to a single variable)
      to have a scenario comparable to other ADC examples using programming model
      polling or interruption.
      Size of array can be modified with literal ADC_CONVERTED_DATA_BUFFER_SIZE).

Example execution:
At each press on User Button, the ADC performs 1 conversion of the selected
channel.
DMA transfers conversion data to the array.
When DMA reaches the selected number of transfers,
DMA half transfer and transfer complete interruptions occurs.
Data array is updated indefinitely (DMA in circular mode).
LED2 is turned off at DMA half transfer and turned on at DMA transfer complete.

For debug: variables to monitor with debugger watch window:
 - "aADCxConvertedData": ADC group regular conversion data
 - "aADCxConvertedData_Voltage_mVolt": ADC conversion data computation to physical values (array of data)
 - "ubDmaTransferStatus": status of DMA transfer of ADC group regular conversion

Connection needed:
Use an external power supply, adjust supply voltage and connect it to analog input pin (cf pin below).

Other peripherals used:
  1 GPIO for User Button
  1 GPIO for LED2
  1 GPIO for analog input: PA.04 (Arduino connector CN8 pin A2, Morpho connector CN7 pin 32)
  DMA

@par Directory contents 

  - ADC/ADC_SingleConversion_TriggerSW_DMA/Inc/stm32f1xx_it.h          Interrupt handlers header file
  - ADC/ADC_SingleConversion_TriggerSW_DMA/Inc/main.h                  Header for main.c module
  - ADC/ADC_SingleConversion_TriggerSW_DMA/Inc/stm32_assert.h          Template file to include assert_failed function
  - ADC/ADC_SingleConversion_TriggerSW_DMA/Src/stm32f1xx_it.c          Interrupt handlers
  - ADC/ADC_SingleConversion_TriggerSW_DMA/Src/main.c                  Main program
  - ADC/ADC_SingleConversion_TriggerSW_DMA/Src/system_stm32f1xx.c      STM32F1xx system source file


@par Hardware and Software environment

  - This example runs on STM32F103xB devices.
    
  - This example has been tested with STM32F103RB-Nucleo 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>
 */
