/**
  @page ADC_MultiChannelSingleConversion ADC example
  
  @verbatim
  ******************** (C) COPYRIGHT 2016 STMicroelectronics *******************
  * @file    Examples_LL/ADC/ADC_MultiChannelSingleConversion/readme.txt 
  * @author  MCD Application Team
  * @brief   Description of the ADC_MultiChannelSingleConversion example.
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; Copyright (c) 2016 STMicroelectronics.
  * All rights reserved.</center></h2>
  *
  * This software component is licensed by ST under BSD 3-Clause license,
  * the "License"; You may not use this file except in compliance with the
  * License. You may obtain a copy of the License at:
  *                        opensource.org/licenses/BSD-3-Clause
  *
  ******************************************************************************
  @endverbatim

@par Example Description

How to use an ADC peripheral to convert several channels. ADC conversions are 
performed successively in a scan sequence.
This example is based on the STM32F0xx ADC LL API.
The peripheral initialization is done using LL unitary service functions 
for optimization purposes (performance and size).

Example configuration:
ADC is configured in single conversion mode, from SW trigger.
Sequencer of group regular (default group available on ADC of all STM32 devices)
is configured to convert 3 channels: 1 channel from GPIO, 2 internal channels:
temperature sensor and VrefInt.
DMA is configured to transfer conversion data in an array of size three (one array
address for conversion data of each channel), in circular mode to update
results array at each ADC sequence conversions.

Example execution:
At each press on push button, the ADC executes the scan sequence: 
ADC performs conversion of the three selected channels successively,
in burst (discontinuous mode not enabled).
The 3 ADC conversions data are transferred by DMA into the results array
"aADCxConvertedData".
ADC conversion data of each sequence rank is at an address of the array:
 - aADCxConvertedData[0]: ADC channel set on rank1 (GPIO as analog input)
 - aADCxConvertedData[2]: ADC channel set on rank3 (VrefInt)
 - aADCxConvertedData[1]: ADC channel set on rank2 (Temperature sensor)
LED is turned on when ADC conversions and DMA transfer of the sequence
are completed.

ADC conversions raw data are computed to physical values
using LL ADC driver helper macro:
 - Value of voltage on GPIO pin (on which is mapped ADC channel) (unit: mV)
 - Value of internal voltage reference VrefInt (unit: mV)
 - Value of temperature (unit: degree Celcius)
 - Value of analog reference voltage (Vref+), connected to analog voltage supply Vdda (unit: mV)

For debug: variables to monitor with debugger watch window:
 - "aADCxConvertedData": ADC group regular conversion data
 - "ubDmaTransferStatus": status of DMA transfer of ADC group regular conversions
 - "uhADCxConvertedData_VoltageGPIO_mVolt":        Value of voltage on GPIO pin (on which is mapped ADC channel) (unit: mV)
 - "uhADCxConvertedData_VrefInt_mVolt":            Value of internal voltage reference VrefInt (unit: mV)
 - "hADCxConvertedData_Temperature_DegreeCelsius": Value of temperature (unit: degree Celcius)
 - "uhADCxConvertedData_VrefAnalog_mVolt":         Value of analog reference voltage (Vref+), connected to analog voltage supply Vdda (unit: mV)

Connection needed:
None.
Note: Optionally, a voltage can be supplied to the analog input pin (cf pin below),
      between 0V and Vdda=3.3V, to perform a ADC conversion on a determined
      voltage level.
      Otherwise, this pin can be let floating (in this case ADC conversion data
      will be undetermined).

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


@par Directory contents 

  - ADC/ADC_MultiChannelSingleConversion/Inc/stm32f0xx_it.h          Interrupt handlers header file
  - ADC/ADC_MultiChannelSingleConversion/Inc/main.h                  Header for main.c module
  - ADC/ADC_MultiChannelSingleConversion/Inc/stm32_assert.h          Template file to include assert_failed function
  - ADC/ADC_MultiChannelSingleConversion/Src/stm32f0xx_it.c          Interrupt handlers
  - ADC/ADC_MultiChannelSingleConversion/Src/main.c                  Main program
  - ADC/ADC_MultiChannelSingleConversion/Src/system_stm32f0xx.c      STM32F0xx system source file


@par Hardware and Software environment

  - This example runs on STM32F072xx devices.
    
  - This example has been tested with STM32F072RB-Nucleo RevC 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>
 */
