FreeRTOS - Interrupt Management
Which of the following is the correct way to declare a variable to track if a higher priority task was woken inside an ISR?
?Which of the following is the correct way to declare a variable to track if a higher priority task was woken inside an ISR?
easy📝 Syntax Q12 of 15
Step-by-Step Solution
Solution:
Step 1: Identify FreeRTOS type for ISR task wake flag
FreeRTOS usesBaseType_tfor portability and definespdFALSEandpdTRUEfor boolean values.Step 2: Correct initialization
The variable must start aspdFALSEto indicate no task was woken yet.Final Answer:
BaseType_t higherPriorityTaskWoken = pdFALSE; -> Option CQuick Check:
Use BaseType_t and pdFALSE for ISR flags [OK]
Quick Trick: Use BaseType_t and pdFALSE to track task wake in ISR [OK]
Common Mistakes:
- Using plain int instead of BaseType_t
- Initializing flag to 1 instead of pdFALSE
- Using bool which may not be portable
Master "Interrupt Management" in FreeRTOS
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