STM32CubeF4/Projects/STM32446E_EVAL/Applications/FreeRTOS/FreeRTOS_SemaphoreFromISR/readme.txt

/**
  @page FreeRTOS_SemaphoreFromISR FreeRTOS Semaphore From ISR example
 
  @verbatim
  ******************** (C) COPYRIGHT 2017 STMicroelectronics *******************
  * @file    FreeRTOS/FreeRTOS_SemaphoreFromISR/readme.txt
  * @author  MCD Application Team
  * @brief   Description of the FreeRTOS Semaphore From ISR 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 Application Description

How to use semaphore from ISR with CMSIS RTOS API.

This application creates a thread that toggle LED through semaphore given 
from ISR.
 
Each time the user push the Tamper button of the EVAL board the semaphore 
is given to the SemaphoreTest Thread to toggle the LED1  


@note Care must be taken when using HAL_Delay(), this function provides accurate delay (in milliseconds)
      based on variable incremented in HAL time base ISR. This implies that if HAL_Delay() is called from
      a peripheral ISR process, then the HAL time base interrupt must have higher priority (numerically lower)
      than the peripheral interrupt. Otherwise the caller ISR process will be blocked.
      To change the HAL time base interrupt priority you have to use HAL_NVIC_SetPriority() function.
      
@note The application needs to ensure that the HAL time base is always set to 1 millisecond to have correct 
      HAL operation.
	  
@note The FreeRTOS heap size configTOTAL_HEAP_SIZE defined in FreeRTOSConfig.h is set according to the OS resources memory requirements of the application with +10% margin and rounded to the upper Kbyte boundary.

For more details about FreeRTOS implementation on STM32Cube, please refer to UM1722 "Developing Applications 
on STM32Cube with RTOS".

@par Keywords

RTOS, FreeRTOS, Threading, Semaphore, Priorities, ISR, Interrupt

@par Directory contents

    - FreeRTOS/FreeRTOS_SemaphoreFromISR/Inc/main.h                Main program header file
    - FreeRTOS/FreeRTOS_SemaphoreFromISR/Inc/stm32f4xx_hal_conf.h  HAL Library Configuration file
    - FreeRTOS/FreeRTOS_SemaphoreFromISR/Inc/stm32f4xx_it.h        Interrupt handlers header file
    - FreeRTOS/FreeRTOS_SemaphoreFromISR/Inc/FreeRTOSConfig.h      FreeRTOS Configuration file
    - FreeRTOS/FreeRTOS_SemaphoreFromISR/Src/main.c               Main program
    - FreeRTOS/FreeRTOS_SemaphoreFromISR/Src/stm32f4xx_it.c       Interrupt handlers


@par Hardware and Software environment

  - This example runs on STM32F446xx devices.
  
  - This example has been tested with STM32446E-EVAL 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


 */