What will happen if a task calls xEventGroupWaitBits() with waitForAllBits set to pdTRUE but only some bits are set?

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FreeRTOS - Design Patterns for RTOS

What will happen if a task calls xEventGroupWaitBits() with waitForAllBits set to pdTRUE but only some bits are set?

AThe task will block until all specified bits are set

BThe task will immediately return with the bits set

CThe task will cause a runtime error

DThe task will ignore the bits and continue

Step-by-Step Solution

Solution:

Step 1: Understand waitForAllBits parameter
When waitForAllBits is pdTRUE, the task waits for all bits to be set before returning.
Step 2: Behavior when only some bits are set
The task blocks until all bits are set, so it does not return immediately.
Final Answer:
The task will block until all specified bits are set -> Option A
Quick Check:
waitForAllBits true means wait for all bits [OK]

Quick Trick: waitForAllBits true blocks until all bits set [OK]

Common Mistakes:

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