You want to design a system where Task A waits for either event bit 0x01 or 0x02 to be set by Task B without clearing them on exit. Which call to xEventGroupWaitBits() achieves this?
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FreeRTOS - Design Patterns for RTOS
You want to design a system where Task A waits for either event bit 0x01 or 0x02 to be set by Task B without clearing them on exit. Which call to xEventGroupWaitBits() achieves this?
To wait for either bit 0x01 or 0x02, waitForAllBits must be false (pdFALSE).
Step 2: Match parameters to requirement
xEventGroupWaitBits(xEventGroup, 0x03, pdFALSE, pdFALSE, portMAX_DELAY); sets waitForAllBits to pdFALSE and clears bits on exit to pdFALSE, which fits the requirement.
Final Answer:
xEventGroupWaitBits(xEventGroup, 0x03, pdFALSE, pdFALSE, portMAX_DELAY); -> Option D
Quick Check:
waitForAllBits false waits for any bit [OK]
Quick Trick:Use waitForAllBits = pdFALSE to wait for any bit [OK]
Common Mistakes:
Setting waitForAllBits true to wait for any bit
Confusing clear on exit parameter
Using wrong bit mask
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