STM32CubeF4

/**
  @page ADC_SingleConversion_TriggerTimer_DMA ADC example
  
  @verbatim
  ******************** (C) COPYRIGHT 2017 STMicroelectronics *******************
  * @file    Examples_LL/ADC/ADC_SingleConversion_TriggerTimer_DMA/readme.txt 
  * @author  MCD Application Team
  * @brief   Description of the ADC_SingleConversion_TriggerTimer_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 a ADC peripheral to perform 
a single ADC conversion of a channel, at each trigger event from timer; 
Conversion data are transferred by DMA into a table,
indefinitely (circular mode); 
This example is based on the STM32F4xx ADC LL API; 
peripheral initialization 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 HW trigger: timer peripheral.
DMA is configured to transfer conversion data in an array, in circular mode.
A timer is configured in time base and to generate TRGO events.

Example execution:
From the first press on User Button, the ADC performs 1 conversion of the selected
channel at each trig from timer.
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)

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


@par Directory contents 

  - ADC/ADC_SingleConversion_TriggerTimer_DMA/Inc/stm32f4xx_it.h          Interrupt handlers header file
  - ADC/ADC_SingleConversion_TriggerTimer_DMA/Inc/main.h                  Header for main.c module
  - ADC/ADC_SingleConversion_TriggerTimer_DMA/Inc/stm32_assert.h          Template file to include assert_failed function
  - ADC/ADC_SingleConversion_TriggerTimer_DMA/Src/stm32f4xx_it.c          Interrupt handlers
  - ADC/ADC_SingleConversion_TriggerTimer_DMA/Src/main.c                  Main program
  - ADC/ADC_SingleConversion_TriggerTimer_DMA/Src/system_stm32f4xx.c      STM32F4xx system source file


@par Hardware and Software environment

  - This example runs on STM32F411xx devices.
    
  - This example has been tested with NUCLEO-F411RE 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>
 */