mirror of
https://github.com/STMicroelectronics/STM32CubeF7.git
synced 2025-05-07 19:29:17 +08:00
83 lines
4.0 KiB
Plaintext
83 lines
4.0 KiB
Plaintext
/**
|
||
@page RNG_GenerateRandomNumbers_IT RNG : Random Number Generation using IT
|
||
|
||
@verbatim
|
||
******************************************************************************
|
||
* @file Examples_LL/RNG/RNG_GenerateRandomNumbers_IT/readme.txt
|
||
* @author MCD Application Team
|
||
* @brief Description of the RNG_GenerateRandomNumbers_IT 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
|
||
|
||
Configuration of the RNG to generate 32-bit long random numbers using interrupts. The peripheral initialization uses LL unitary service
|
||
functions for optimization purposes (performance and size).
|
||
|
||
Example execution:
|
||
After startup from reset and system configuration, RNG configuration is performed.
|
||
(Configure PLLSA11 to enable 48M domain, then enable PLLSAI1 output mapped on 48MHz domain clock
|
||
and configure PLLSAI as RNG clock source).
|
||
|
||
User is then asked to press key button (LED1 blinking fast).
|
||
On user button press, several (8) Random 32bit numbers are generated
|
||
(On each raised RNG interrupt, a random number is generated and retrieved from DR register).
|
||
Corresponding generated values are available and stored in a u32 array (aRandom32bit),
|
||
whose content could be displayed using debugger (Watch or LiveWatch features).
|
||
After successful Random numbers generation, LED1 is turned On.
|
||
In case of errors, LED1 is slowly blinking (1sec period).
|
||
|
||
@par Keywords
|
||
|
||
Analog, RNG, Random, FIPS PUB 140-2, Analog Random number generator, Entropy, Period, Interrupt
|
||
|
||
@Note If the user code size exceeds the DTCM-RAM size or starts from internal cacheable memories (SRAM1 and SRAM2),that is shared between several processors,
|
||
then it is highly recommended to enable the CPU cache and maintain its coherence at application level.
|
||
The address and the size of cacheable buffers (shared between CPU and other masters) must be properly updated to be aligned to cache line size (32 bytes).
|
||
|
||
@Note It is recommended to enable the cache and maintain its coherence, but depending on the use case
|
||
It is also possible to configure the MPU as "Write through", to guarantee the write access coherence.
|
||
In that case, the MPU must be configured as Cacheable/Bufferable/Not Shareable.
|
||
Even though the user must manage the cache coherence for read accesses.
|
||
Please refer to the AN4838 “Managing memory protection unit (MPU) in STM32 MCUs”
|
||
Please refer to the AN4839 “Level 1 cache on STM32F7 Series”
|
||
|
||
@par Directory contents
|
||
|
||
- RNG/RNG_GenerateRandomNumbers_IT/Inc/stm32f7xx_it.h Interrupt handlers header file
|
||
- RNG/RNG_GenerateRandomNumbers_IT/Inc/main.h Header for main.c module
|
||
- RNG/RNG_GenerateRandomNumbers_IT/Inc/stm32_assert.h Template file to include assert_failed function
|
||
- RNG/RNG_GenerateRandomNumbers_IT/Src/stm32f7xx_it.c Interrupt handlers
|
||
- RNG/RNG_GenerateRandomNumbers_IT/Src/main.c Main program
|
||
- RNG/RNG_GenerateRandomNumbers_IT/Src/system_stm32f7xx.c STM32F7xx system source file
|
||
|
||
|
||
@par Hardware and Software environment
|
||
|
||
- This example runs on STM32F767xx devices.
|
||
|
||
- This example has been tested with NUCLEO-F767ZI 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
|
||
- Push User button and use Variable watch window from debugger to access to values of generated numbers.
|
||
(A break point could be set on LED_On() call, at end of RandomNumbersGeneration_IT() function).
|
||
|
||
|
||
*/
|