STM32CubeF0

@verbatim
******************** (C) COPYRIGHT 2016 STMicroelectronics *******************
* @file DAC/DAC_SignalsGeneration/readme.txt
* @author MCD Application Team
* @brief Description of the DAC Signals generation 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 the DAC peripheral to generate several signals using the DMA
controller.
For each press on User push-button, a signal has been selected and can be monitored on
the DAC channel one:
- Triangle waveform (Channel 1).
- Escalator waveform (Channel 1) using DMA transfer.

STM32 Discovery board's LEDs can be used to monitor the transfer status:
- LED5 is ON when there is an error in initialization.

@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 need to ensure that the SysTick time base is always set to 1 millisecond
to have correct HAL operation.

@par Directory contents

- DAC/DAC_SignalsGeneration/Inc/stm32f0xx_hal_conf.h HAL configuration file
- DAC/DAC_SignalsGeneration/Inc/stm32f0xx_it.h DMA interrupt handlers header file
- DAC/DAC_SignalsGeneration/Inc/main.h Header for main.c module
- DAC/DAC_SignalsGeneration/Src/stm32f0xx_it.c DMA interrupt handlers
- DAC/DAC_SignalsGeneration/Src/main.c Main program
- DAC/DAC_SignalsGeneration/Src/stm32f0xx_hal_msp.c HAL MSP file
- DAC/DAC_SignalsGeneration/Src/system_stm32f0xx.c STM32F0xx system source file

@par Hardware and Software environment
- This example runs on STM32F072RB devices.

- This example has been tested with STM32F072B-Discovery RevC board and can be
easily tailored to any other supported device and development board.

- STM32F072B-Discovery RevC Set-up
- Use User push-button connected to PA.00.
- Connect PA4 (DAC Channel1) pin to an oscilloscope.

@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