[Solved] What is wrong with this ISR code snippet if configMAX_SYSCALL_INTERRUPT_PRIORITY is set to 0x30?void ISR_Handler(void) { vTaskDelay(10); } | FreeRTOS

FreeRTOS - Interrupt Management

What is wrong with this ISR code snippet if configMAX_SYSCALL_INTERRUPT_PRIORITY is set to 0x30?

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

ANo issue; this is valid ISR code

BISR priority is too low to call <code>vTaskDelay</code>

CThe ISR should disable interrupts before calling <code>vTaskDelay</code>

DCalling <code>vTaskDelay</code> inside ISR is invalid regardless of priority

Step-by-Step Solution

Solution:

Step 1: Understand vTaskDelay usage
vTaskDelay is a blocking API function that must not be called from an ISR.
Step 2: Check ISR context restrictions
Only special 'FromISR' API functions are safe to call inside ISRs, regardless of priority.
Final Answer:
Calling vTaskDelay inside ISR is invalid regardless of priority -> Option D
Quick Check:
Blocking API calls inside ISR = Invalid [OK]

Quick Trick: Use FromISR APIs inside interrupts only [OK]

Common Mistakes:

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What is wrong with this ISR code snippet if configMAX_SYSCALL_INTERRUPT_PRIORITY is set to 0x30?