The event group unit tests would previously use a single call bit (the
"BIT_CALL" macro) to unblock all the test tasks. However, if one or more tasks
were delayed in calling xEventGroupWaitBits(), the other tasks would clear the
test bits, leading to the test deadlocking.
This commit updates the bits used so that each task gets their own CALL and
RESPONSE bits.
The "FreeRTOS Event Groups" main task will only wait a single tick for the created
tasks to set their response bits. This short delay may not be sufficent if the tick
frequency is high.
This commit updates the test so that
- the main task waits indefinitely for all the response bits to be set.
- created tasks are cleand up by the main task