/**
@page FreeRTOS_Signal FreeRTOS Signal example
@verbatim
******************** (C) COPYRIGHT 2017 STMicroelectronics *******************
* @file FreeRTOS/FreeRTOS_Signal/readme.txt
* @author MCD Application Team
* @brief Description of the FreeRTOS Signal 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 perform thread signaling using CMSIS RTOS API.
This example creates three threads with the same priority.
Thread1 calls osSignalWait to wait for a signal that sets bit0, then toggles LED3
Thread2 calls osSignalWait to wait for a signal that sets bit1 and bit2, then toggles LED4
Thread3 performs the following actions:
- calls osSetSignal to send a signal with bit0 to Thread1
- delay for 500ms
- calls osSetSignal to send a signal with bit1 and bit2 to Thread2
- delay for 500ms
As a result, LEDs 3 and 4 show the following behaviour:
- LED3 On, delay 500ms
- LED4 On, delay 500ms
- LED3 Off, delay 500ms
- LED4 off, delay 500ms
- loop-back
@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 need 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, Threading, Signal,
@par Directory contents
- FreeRTOS/FreeRTOS_Signal/Src/main.c Main program
- FreeRTOS/FreeRTOS_Signal/Src/stm32f4xx_it.c Interrupt handlers
- FreeRTOS/FreeRTOS_Signal/Src/system_stm32f4xx.c STM32F4xx system clock configuration file
- FreeRTOS/FreeRTOS_Signal/Inc/main.h Main program header file
- FreeRTOS/FreeRTOS_Signal/Inc/stm32f4xx_hal_conf.h HAL Library Configuration file
- FreeRTOS/FreeRTOS_Signal/Inc/stm32f4xx_it.h Interrupt handlers header file
- FreeRTOS/FreeRTOS_Signal/Inc/FreeRTOSConfig.h FreeRTOS Configuration file
@par Hardware and Software environment
- This example runs on STM32F413xx devices.
- This example has been tested with STM32413H-DISCOVERY 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
*/
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