You want to notify a task from multiple ISRs using ISR-to-task notifications. Which approach ensures the task processes all notifications without missing any?

hard📝 Application Q15 of 15

FreeRTOS - Task Notifications

AUse vTaskNotifyGiveFromISR() once and ulTaskNotifyTake() once; task processes only one notification

BUse xTaskNotifyGive() in ISRs and ulTaskNotifyTake() in task with zero timeout

CUse ulTaskNotifyTake() with clear count and call vTaskNotifyGiveFromISR() in each ISR; task loops to process all notifications

DUse a global variable incremented in ISRs and checked in task without notifications

Step-by-Step Solution

Solution:

Step 1: Understand multiple ISR notifications
Each ISR calls vTaskNotifyGiveFromISR() to increment notification count.
Step 2: Task processes all notifications
Task uses ulTaskNotifyTake(pdTRUE, portMAX_DELAY) in a loop to clear all counts and process each notification.
Final Answer:
Use ulTaskNotifyTake() with clear count and call vTaskNotifyGiveFromISR() in each ISR; task loops to process all notifications -> Option C
Quick Check:
Multiple ISR notifications require counting and looping [OK]

Quick Trick: Loop ulTaskNotifyTake() to handle multiple ISR signals [OK]

Common Mistakes:

Assuming one notification covers all ISR events
Using non-FromISR functions in ISR
Ignoring notification count clearing

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More FreeRTOS Quizzes

You want to notify a task from multiple ISRs using ISR-to-task notifications. Which approach ensures the task processes all notifications without missing any?

Step 1: Understand multiple ISR notifications

Step 2: Task processes all notifications

Final Answer:

Quick Check:

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