FreeRTOS: Change the priority of a task from within an ISR?

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本文探讨了在FreeRTOS环境下从中断服务例程(ISR)内部更改任务优先级的方法。虽然FreeRTOS没有提供直接的API来实现这一功能，但可以通过创建自定义函数来实现，该函数移除了关键部分并使用taskYIELD_FROM_ISR()函数代替taskYIELD()。

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URL: http://ehc.ac/p/freertos/discussion/382005/thread/4c7ba356/

URL: http://www.freertos.org/FreeRTOS_Support_Forum_Archive/May_2008/freertos_vTaskPrioritySet_from_an_ISR._2030373.html

Does there exist a way to change the priority of a task from within an ISR?

Thanks,

There is no vTaskPrioritySetFromISR() function but you could create one yourself. I think this would be basically the same as the vTaskPrioritySet() function but with the critical sections removed, and the call to taskYIELD() moved to the end of the function. If a yield was required you would set a flag instead of calling taskYIELD(), then use the taskYIELD_FROM_ISR() function as demonstrated in the examples for your port.