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How to make a task block on a specific notification?

Posted by bencohavi on January 16, 2018


Is there a way to make a task block on a specific notification?

In other words, I want to block the task until a certain notification arrives. In case other notifications have arrived during that time, I don't want my task to resume action.



How to make a task block on a specific notification?

Posted by richard_damon on January 16, 2018

In general, when a task blocks in FreeRTOS it is blocking for a specific event. If it gets from a Queue (and no data is available), the task blocks on that Queue. If it takes a Semaphore or a Mutex, it waits for that Semaphore or Mutex.

If you are waiting on a direct to task notification, the task will only unblock on a direct to task notification, but I don't think you can choose to only be unblocked on certain bits. I think you could use an EventGroup to do something like that.

The more common question is how to make a task unblock on multiple sources, which is where the QueueSets and EventGroups came from, to provide solutions to that.

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