STM32CubeF3

@verbatim
******************** (C) COPYRIGHT 2016 STMicroelectronics *******************
* @file ADC/ADC_Sequencer/readme.txt
* @author MCD Application Team
* @brief Description of the ADC conversion example
******************************************************************************
* @attention
*
* Copyright (c) 2016 STMicroelectronics.
* All rights reserved.
*
* This software is licensed under terms that can be found in the LICENSE file
* in the root directory of this software component.
* If no LICENSE file comes with this software, it is provided AS-IS.
*
******************************************************************************
@endverbatim

@par Example Description

How to use the ADC peripheral with a sequencer to convert several channels.
The channels converted are, in order, one external channel and two internal
channels (VrefInt and temperature sensors).
Moreover, voltage and temperature are then computed.

Other peripherals related to ADC are used:
Mandatory:
- GPIO peripheral is used in analog mode to drive signal from device pin to
ADC input.
Optionally:
- DMA peripheral is used to transfer ADC conversions data.

ADC settings:
Sequencer is enabled, and set to convert 3 ranks (3 channels) in discontinuous
mode, one by one at each conversion trig.

ADC conversion results:
- ADC conversions results are transferred automatically by DMA, into variable
array "aADCxConvertedValues".
- Each address of this array is containing the conversion data of 1 rank of the
ADC sequencer.
- When DMA transfer half-buffer and buffer length are reached, callbacks
HAL_ADC_ConvCpltCallback() and HAL_ADC_ConvCpltCallback() are called.
- When the ADC sequence is fully completed (3 ADC conversions), the
voltage and temperature are computed and placed in variables:
uhADCChannelToDAC_mVolt, uhVrefInt_mVolt, wTemperature_DegreeCelsius.

Board settings:
- ADC is configured to convert ADC_CHANNEL_2 (pin PA.01).
- The voltage input on ADC channel is provided from DAC channel.
DAC channel output is on pin PA.04.
Note: ADC channel could have been chosen on pin PA.04 to be directly connected to DAC output,
but this channel is on ADC2 only on this device. This example must use ADC1 because temperature sensor
can be read from ADC1 only. Pin PA.01 is connected to a channel of ADC1.
==> Therefore, external connection is needed between pins PA.04 and PA.01 to run this example.
- Voltage is increasing at each click on push button, from 0 to maximum range in 4 steps.
Clicks on push button follow circular cycles: At clicks counter maximum value reached, counter is set back to 0.

STM32F303RE-Nucleo Rev C board's LED is be used to monitor the program execution status:
- Normal operation: LED2 is turned-on/off in function of ADC conversion
result.
- Turned-off if sequencer has not yet converted all ranks
- Turned-on if sequencer has converted all ranks
- Error: In case of error, LED2 is toggling at a frequency of 1Hz.

@note Care must be taken when using HAL_Delay(), this function provides accurate delay (in milliseconds)
based on variable incremented in SysTick ISR. This implies that if HAL_Delay() is called from
a peripheral ISR process, then the SysTick interrupt must have higher priority (numerically lower)
than the peripheral interrupt. Otherwise the caller ISR process will be blocked.
To change the SysTick interrupt priority you have to use HAL_NVIC_SetPriority() function.

@note The application needs to ensure that the SysTick time base is always set to 1 millisecond
to have correct HAL operation.

@par Directory contents

- ADC/ADC_Sequencer/Inc/stm32f3xx_hal_conf.h HAL configuration file
- ADC/ADC_Sequencer/Inc/stm32f3xx_it.h DMA interrupt handlers header file
- ADC/ADC_Sequencer/Inc/main.h Header for main.c module
- ADC/ADC_Sequencer/Src/stm32f3xx_it.c DMA interrupt handlers
- ADC/ADC_Sequencer/Src/main.c Main program
- ADC/ADC_Sequencer/Src/stm32f3xx_hal_msp.c HAL MSP file
- ADC/ADC_Sequencer/Src/system_stm32f3xx.c STM32F3xx system source file

@par Hardware and Software environment

- This example runs on STM32F303RE devices.

- This example has been tested with STM32F303RE-Nucleo Rev C 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