STM32CubeF4

@verbatim
******************** (C) COPYRIGHT 2017 STMicroelectronics *******************
* @file PWR/PWR_STOP/readme.txt
* @author MCD Application Team
* @brief Description of the PWR Programmable Voltage Detector (PVD) example.
******************************************************************************
* @attention
*
* Copyright (c) 2017 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
This example shows how to configure the programmable voltage detector using
an external interrupt line. In this example, EXTI line 16 is configured to generate
an interrupt on each rising or falling edge of the PVD output signal (which
indicates that the Vdd voltage is below the PVD threshold).
In the interrupt routine a LED connected to a specific GPIO pin is toggled every
time the voltage drops below or above the target threshold.

A LED connected to a specific GPIO pin is toggling to indicate that the system
is in RUN.

@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 Keywords

Power, PWR, EXTI, PVD, Interrupt, Wakeup, External reset

@par Directory contents

- PWR/PWR_PVD/Inc/stm32f4xx_hal_conf.h HAL configuration file
- PWR/PWR_PVD/Inc/stm32f4xx_it.h Interrupt handlers header file
- PWR/PWR_PVD/Inc/main.h header file for main.c
- PWR/PWR_PVD/Src/system_stm32f4xx.c STM32F4xx system clock configuration file
- PWR/PWR_PVD/Src/stm32f4xx_it.c Interrupt handlers
- PWR/PWR_PVD/Src/main.c Main program
- PWR/PWR_PVD/Src/stm32f4xx_hal_msp.c HAL MSP module

@par Hardware and Software environment

- This example runs on STM32F429xx/STM32F439xx devices.

- This example has been tested with STMicroelectronics STM324x9I-EVAL RevB
evaluation boards and can be easily tailored to any other supported device
and development board.

- STM324x9I-EVAL RevB Set-up
- Use LED1, LED2 and LED3 connected respectively to PG.06, PG.07 and PG.10 pins
@note This example can't run on the STM324x9I-EVAL 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