[Solved] Which of the following is the correct way to write an ISR (Interrupt Service Routine) in FreeRTOS? — Ans: void ISR_Handler() { BaseType_t xHigherPriorityTaskWoken = pdFALSE;... | FreeRTOS

FreeRTOS - Interrupt Management

Which of the following is the correct way to write an ISR (Interrupt Service Routine) in FreeRTOS?

Avoid ISR_Handler() { vTaskDelay(100); }

Bvoid ISR_Handler() { while(1) {} }

Cvoid ISR_Handler() { delay(1000); }

Dvoid ISR_Handler() { BaseType_t xHigherPriorityTaskWoken = pdFALSE; xSemaphoreGiveFromISR(&xSemaphore, &xHigherPriorityTaskWoken); }

Step-by-Step Solution

Solution:

Step 1: Identify correct ISR practices in FreeRTOS
ISRs must be quick and use FreeRTOS-safe functions like xSemaphoreGiveFromISR.
Step 2: Check each option for ISR correctness
void ISR_Handler() { BaseType_t xHigherPriorityTaskWoken = pdFALSE; xSemaphoreGiveFromISR(&xSemaphore, &xHigherPriorityTaskWoken); } uses xSemaphoreGiveFromISR with proper parameters, which is correct.
Final Answer:
void ISR_Handler() { BaseType_t xHigherPriorityTaskWoken = pdFALSE; xSemaphoreGiveFromISR(&xSemaphore, &xHigherPriorityTaskWoken); } -> Option D
Quick Check:
Use FreeRTOS-safe calls in ISR [OK]

Quick Trick: Use FreeRTOS-safe calls inside ISR [OK]

Common Mistakes:

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More FreeRTOS Quizzes

Which of the following is the correct way to write an ISR (Interrupt Service Routine) in FreeRTOS?