88 lines
3.9 KiB
Plaintext
88 lines
3.9 KiB
Plaintext
/**
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@page FreeRTOS_Queues FreeRTOS Mail queue example
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@verbatim
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******************** (C) COPYRIGHT 2016 STMicroelectronics *******************
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* @file FreeRTOS/FreeRTOS_Mail/readme.txt
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* @author MCD Application Team
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* @brief Description of the FreeRTOS Mail example.
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******************************************************************************
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* @attention
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*
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* <h2><center>© Copyright (c) 2016 STMicroelectronics.
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* All rights reserved.</center></h2>
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*
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* This software component is licensed by ST under Ultimate Liberty license
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* SLA0044, the "License"; You may not use this file except in compliance with
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* the License. You may obtain a copy of the License at:
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* www.st.com/SLA0044
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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 use mail queues with CMSIS RTOS API.
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This example creates two threads that send and receive mail
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the mail to send/receive is a structure that holds three variables (var1 and var2 are uint32, var3 is a uint8)
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One thread acts as a producer and the other as the consumer.
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The consumer is a higher priority than the producer and is set to block on mail receiving.
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The Mail queue has space for one item. The producer allocates the mail and put it on the mail queue.
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As soon as the producer posts a mail on the queue the consumer will unblock, preempt the producer,
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get the mail and free it.
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Add the following variables to LiveWatch, the three producer values must respectively remain equals to the three consumer values all the time:
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- ConsumerValue1 must remain equal to ProducerValue1
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- ConsumerValue2 must remain equal to ProducerValue2
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- ConsumerValue3 must remain equal to ProducerValue3
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LEDs can be used to monitor the example status:
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- LED1 should toggle when the example runs successfully.
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- LED3 is ON when any error occurs.
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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 SysTick ISR. This implies that if HAL_Delay() is called from
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a peripheral ISR process, then the SysTick 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 SysTick interrupt priority you have to use HAL_NVIC_SetPriority() function.
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@note The application need to ensure that the SysTick 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 accordingly to the
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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 Directory contents
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- FreeRTOS/FreeRTOS_Mail/Src/main.c Main program
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- FreeRTOS/FreeRTOS_Mail/Src/stm32f1xx_it.c Interrupt handlers
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- FreeRTOS/FreeRTOS_Mail/Src/system_stm32f1xx.c STM32F1xx system clock configuration file
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- FreeRTOS/FreeRTOS_Mail/Inc/main.h Main program header file
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- FreeRTOS/FreeRTOS_Mail/Inc/stm32f1xx_hal_conf.h HAL Library Configuration file
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- FreeRTOS/FreeRTOS_Mail/Inc/stm32f1xx_it.h Interrupt handlers header file
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- FreeRTOS/FreeRTOS_Mail/Inc/FreeRTOSConfig.h FreeRTOS Configuration file
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@par Hardware and Software environment
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- This example runs on STM32F103xG devices.
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- This example has been tested with STM3210E-EVAL RevD 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 example
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* <h3><center>© COPYRIGHT STMicroelectronics</center></h3>
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*/
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