78 lines
3.2 KiB
Plaintext
78 lines
3.2 KiB
Plaintext
/**
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@page FreeRTOS_SemaphoreFromISR FreeRTOS Semaphore From ISR application
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@verbatim
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******************** (C) COPYRIGHT 2017 STMicroelectronics *******************
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* @file FreeRTOS/FreeRTOS_SemaphoreFromISR/readme.txt
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* @author MCD Application Team
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* @brief Description of the FreeRTOS Semaphore From ISR application.
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******************************************************************************
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* @attention
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*
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* Copyright (c) 2017 STMicroelectronics.
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* All rights reserved.
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*
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* This software is licensed under terms that can be found in the LICENSE file
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* in the root directory of this software component.
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* If no LICENSE file comes with this software, it is provided AS-IS.
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*
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******************************************************************************
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@endverbatim
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@par Application Description
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How to use semaphore from ISR with CMSIS RTOS API.
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This application creates a thread that toggle LED through semaphore given
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from ISR.
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Each time the user push the key button of the EVAL board the semaphore
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is given to the SemaphoreTest Thread to toggle the LED1
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@note Care must be taken when using HAL_Delay(), this function provides accurate delay (in milliseconds)
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based on variable incremented in HAL time base ISR. This implies that if HAL_Delay() is called from
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a peripheral ISR process, then the HAL time base interrupt must have higher priority (numerically lower)
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than the peripheral interrupt. Otherwise the caller ISR process will be blocked.
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To change the HAL time base interrupt priority you have to use HAL_NVIC_SetPriority() function.
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@note The application needs to ensure that the HAL time base is always set to 1 millisecond to have correct
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HAL operation.
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@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.
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For more details about FreeRTOS implementation on STM32Cube, please refer to UM1722 "Developing Applications
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on STM32Cube with RTOS".
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@par Keywords
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RTOS, FreeRTOS, Threading, Semaphore, Priorities, ISR, Interrupt
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@par Directory contents
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- FreeRTOS/FreeRTOS_SemaphoreFromISR/Inc/main.h Main program header file
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- FreeRTOS/FreeRTOS_SemaphoreFromISR/Inc/stm32f4xx_hal_conf.h HAL Library Configuration file
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- FreeRTOS/FreeRTOS_SemaphoreFromISR/Inc/stm32f4xx_it.h Interrupt handlers header file
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- FreeRTOS/FreeRTOS_SemaphoreFromISR/Inc/FreeRTOSConfig.h FreeRTOS Configuration file
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- FreeRTOS/FreeRTOS_SemaphoreFromISR/Src/main.c Main program
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- FreeRTOS/FreeRTOS_SemaphoreFromISR/Src/stm32f4xx_it.c Interrupt handlers
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@par Hardware and Software environment
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- This application runs on STM32F42xxx/STM32F43xxx devices
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- This application has been tested with STM324x9I-EVAL RevB evaluation board and can be
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easily tailored to any other supported device and development board.
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@par How to use it ?
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In order to make the program work, you must do the following :
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- Open your preferred toolchain
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- Rebuild all files and load your image into target memory
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- Run the application
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*/
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