Which of the following is the correct prototype for a FreeRTOS ISR handler that defers processing using task notifications?

easy📝 Syntax Q3 of 15

FreeRTOS - Interrupt Management

Avoid ISR_Handler(void)

Bvoid ISR_Handler(void) { BaseType_t xHigherPriorityTaskWoken = pdFALSE; xTaskNotifyFromISR(..., &xHigherPriorityTaskWoken); portYIELD_FROM_ISR(xHigherPriorityTaskWoken); }

Cvoid ISR_Handler(void) __attribute__((interrupt))

Dvoid ISR_Handler(void) { vTaskDelay(10); }

Step-by-Step Solution

Solution:

Step 1: Recognize correct ISR with deferred processing
void ISR_Handler(void) { BaseType_t xHigherPriorityTaskWoken = pdFALSE; xTaskNotifyFromISR(..., &xHigherPriorityTaskWoken); portYIELD_FROM_ISR(xHigherPriorityTaskWoken); } shows proper use of xTaskNotifyFromISR and portYIELD_FROM_ISR to defer work.
Step 2: Why other options are incorrect
A and C lack deferred processing code; D uses vTaskDelay inside ISR which is invalid.
Final Answer:
ISR with xTaskNotifyFromISR and portYIELD_FROM_ISR -> Option B
Quick Check:
Correct ISR prototype includes notification and yield macros [OK]

Quick Trick: Use portYIELD_FROM_ISR after notifying task in ISR [OK]

Common Mistakes:

Calling vTaskDelay inside ISR
Not using portYIELD_FROM_ISR after notification
Missing BaseType_t variable for task notification

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More FreeRTOS Quizzes

Which of the following is the correct prototype for a FreeRTOS ISR handler that defers processing using task notifications?

Step 1: Recognize correct ISR with deferred processing

Step 2: Why other options are incorrect

Final Answer:

Quick Check:

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