README

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event

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Example Summary

The event example shows how to use the ti.sysbios.knl.Event module which addresses the problem of a task needing to Wait on Multiple events prior to continuing its’ execution.

Example Usage

• Run the application, two tasks the, writertask and readertask, will print messages being passed between them to the console.

Application Design Details

• A reader task, readertask, waits on several events. It needs to wake up when events with Ids Event_Id_0 and Event_Id_1 or ifEvent_Id_2 occurs. The ti.sysbios.knl.Event module provides an Event_pend() API that allows a task to specify an AND mask and an ORmask. These masks determine which event(s) must occur before returning from Event_pend().

• The event related to Event_Id_0 is posted by a Clock Instance using a call to Event_post(). This is an example of the Explicit posting of events.

• Event_Id_1 is posted from within a Semaphore Instance. This is an example of the Implicit posting of events. This is useful when a task needs to wait on a semaphore and an event which is explicitly posted. Event_id_2 is posted from within a Mailbox Instance which occurs wihtin the context of the writertask. This is also an example of Implicit posting of events.

The Semaphore Module does not support events by default, as such, the Semaphore.supportsEvents flag is set to true within the applications configuration file event.cfg.

References

• For more help, search the SYS/BIOS User Guide.