105 lines
4.5 KiB
Plaintext
105 lines
4.5 KiB
Plaintext
/**
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@page FreeRTOS_Signal FreeRTOS Signal example
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@verbatim
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******************** (C) COPYRIGHT 2016 STMicroelectronics *******************
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* @file FreeRTOS/FreeRTOS_Signal/readme.txt
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* @author MCD Application Team
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* @brief Description of the FreeRTOS Signal example.
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******************************************************************************
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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 Description
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How to perform thread signaling using CMSIS RTOS API.
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This example creates three threads with the same priority:
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- Thread1 calls osSignalWait to wait for a signal that sets bit0 then toggles LED1
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- Thread2 calls osSignalWait to wait for a signal that sets bit1 and bit2 then toggles LED2
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- Thread3 performs the following actions:
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- calls osSetSiganl to send a signal with bit0 to Thread1
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- delay for 500ms
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- calls osSetSiganl to send a signal with bit1 and bit2 to Thread2
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- delay for 500ms
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As a results LEDs 1 and 2 show the following behaviour :
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- LED1 On, delay 500ms
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- LED2 On, delay 500ms
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- LED1 Off, delay 500ms
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- LED2 off, delay 500ms
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- loop-back
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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 need to ensure that the HAL time base is always set to 1 millisecond
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to have correct HAL operation.
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@note The FreeRTOS heap size configTOTAL_HEAP_SIZE defined in FreeRTOSConfig.h is set according to
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the OS resources memory requirements of the application with +10% margin and rounded to the
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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, Signal,
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@Note<74>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,
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<20><><EFBFBD><EFBFBD><EFBFBD>then it is highly recommended to enable the CPU cache and maintain its coherence at application level.
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<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>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).
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@Note It is recommended to enable the cache and maintain its coherence, but depending on the use case
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<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> It is also possible to configure the MPU as "Write through", to guarantee the write access coherence.
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<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>In that case, the MPU must be configured as Cacheable/Bufferable/Not Shareable.
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<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Even though the user must manage the cache coherence for read accesses.
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<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Please refer to the AN4838 <20>Managing memory protection unit (MPU) in STM32 MCUs<55>
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<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Please refer to the AN4839 <20>Level 1 cache on STM32F7 Series<65>
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@par Directory contents
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- FreeRTOS/FreeRTOS_Signal/Inc/main.h Main program header file
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- FreeRTOS/FreeRTOS_Signal/Inc/stm32f7xx_hal_conf.h HAL Library Configuration file
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- FreeRTOS/FreeRTOS_Signal/Inc/stm32f7xx_it.h Interrupt handlers header file
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- FreeRTOS/FreeRTOS_Signal/Inc/FreeRTOSConfig.h FreeRTOS Configuration file
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- FreeRTOS/FreeRTOS_Signal/Src/main.c Main program
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- FreeRTOS/FreeRTOS_Signal/Src/stm32f7xx_it.c Interrupt handlers
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@par Hardware and Software environment
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- This application runs on STM32F756xx/STM32F746xx devices.
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- This example has been tested with STM327x6G_EVAL evaluation board and can be
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easily tailored to any other supported device and development board.
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- STM327x6G_EVAL Set-up
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- Ensure that JP24 is in position 2-3 to use LED1.
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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 example
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*/
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