STM32CubeF4

/**
  @page RNG_MultiRNG Multiple Random Number Generator example
  
  @verbatim
  ******************** (C) COPYRIGHT 2017 STMicroelectronics *******************
  * @file    RNG/RNG_MultiRNG/readme.txt 
  * @author  MCD Application Team
  * @brief   Description of Multiple Random Number Generator example.
  ******************************************************************************
  *
  * Copyright (c) 2017 STMicroelectronics. All rights reserved.
  *
  * 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 

This example guides you through the different configuration steps by mean of HAL API 
to ensure RNG random 32bit numbers generation.

At the beginning of the main program the HAL_Init() function is called to reset 
all the peripherals, initialize the Flash interface and the systick.
Then the SystemClock_Config() function is used to configure the system
clock (SYSCLK) to run at 180 MHz.

The RNG peripheral configuration is ensured by the HAL_RNG_Init() function.
This later is calling the HAL_RNG_MspInit()function which core is implementing
the configuration of the needed RNG resources according to the used hardware (CLOCK, 
GPIO, DMA and NVIC). You may update this function to change RNG configuration.

After startup, user is asked to press key button.
Multiple Random 32bit numbers are generated as soon as the key is pressed.
The Random numbers are updated and displayed on the debugger in aRandom32bit variable.

LED3 will turn ON, if any error is occurred.


@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

Analog, RNG, Random, FIPS PUB 140-2, Analog Random number generator, Entropy, Period

@par Directory contents 

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

     
@par Hardware and Software environment

  - This example runs on STM32F42xxx/STM32F43xxx devices.
    
  - This example has been tested with STM324x9I-EVAL RevB evaluation 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>
 */