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/**
@page FreeRTOS_SemaphoreFromISR FreeRTOS semaphore from ISR example
@verbatim
******************************************************************************
* @file FreeRTOS/FreeRTOS_SemaphoreFromISR/readme.txt
* @author MCD Application Team
* @brief Description of the FreeRTOS semaphore from ISR example.
******************************************************************************
*
* Copyright (c) 2019 STMicroelectronics International N.V. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted, provided that the following conditions are met:
*
* 1. Redistribution of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. Neither the name of STMicroelectronics nor the names of other
* contributors to this software may be used to endorse or promote products
* derived from this software without specific written permission.
* 4. This software, including modifications and/or derivative works of this
* software, must execute solely and exclusively on microcontroller or
* microprocessor devices manufactured by or for STMicroelectronics.
* 5. Redistribution and use of this software other than as permitted under
* this license is void and will automatically terminate your rights under
* this license.
*
* THIS SOFTWARE IS PROVIDED BY STMICROELECTRONICS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS, IMPLIED OR STATUTORY WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
* PARTICULAR PURPOSE AND NON-INFRINGEMENT OF THIRD PARTY INTELLECTUAL PROPERTY
* RIGHTS ARE DISCLAIMED TO THE FULLEST EXTENT PERMITTED BY LAW. IN NO EVENT
* SHALL STMICROELECTRONICS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
* OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
******************************************************************************
@endverbatim
@par Application Description
How to use semaphore from ISR with CMSIS RTOS API.
This application creates a thread that toggle a LED through semaphore given from ISR.
Each time the user pushes the User push-button (SW1) of the P-NUCLEO-WB55 board the semaphore
is given to the SemaphoreTest thread to toggle the LED2.
@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 accordingly 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, Thread, Semaphore, Priorities, ISR, Interrupt
@par Directory contents
- FreeRTOS/FreeRTOS_SemaphoreFromISR/Src/main.c Main program
- FreeRTOS/FreeRTOS_SemaphoreFromISR/Src/app_FreeRTOS.c Code for freertos applications
- FreeRTOS/FreeRTOS_SemaphoreFromISR/Src/stm32wbxx_hal_timebase_tim.c HAL timebase file
- FreeRTOS/FreeRTOS_SemaphoreFromISR/Src/stm32wbxx_it.c Interrupt handlers
- FreeRTOS/FreeRTOS_SemaphoreFromISR/Src/stm32wbxx_hal_msp.c MSP Initialization file
- FreeRTOS/FreeRTOS_SemaphoreFromISR/Src/system_stm32wbxx.c STM32WBxx system clock configuration file
- FreeRTOS/FreeRTOS_SemaphoreFromISR/Inc/main.h Main program header file
- FreeRTOS/FreeRTOS_SemaphoreFromISR/Inc/stm32wbxx_hal_conf.h HAL Library Configuration file
- FreeRTOS/FreeRTOS_SemaphoreFromISR/Inc/stm32wbxx_it.h Interrupt handlers header file
- FreeRTOS/FreeRTOS_SemaphoreFromISR/Inc/FreeRTOSConfig.h FreeRTOS Configuration file
@par Hardware and Software environment
- This application runs on STM32WB55RGVx devices.
- This application has been tested with P-NUCLEO-WB55 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>© COPYRIGHT STMicroelectronics</center></h3>
*/
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