[Solved] Given this snippet inside a watchdog task:if(xTaskNotifyWait(0, 0, &ulNotificationValue, pdMS_TO_TICKS(1000)) == pdTRUE) {... }What happens if no notification is received within 1000 ms? | FreeRTOS

FreeRTOS - Design Patterns for RTOS

Given this snippet inside a watchdog task:

if(xTaskNotifyWait(0, 0, &ulNotificationValue, pdMS_TO_TICKS(1000)) == pdTRUE) { resetWatchdogTimer(); }

What happens if no notification is received within 1000 ms?

AThe watchdog timer is not reset and may trigger a system reset

BThe watchdog timer is reset anyway

CThe task blocks indefinitely

DThe system immediately resets

Step-by-Step Solution

Solution:

Step 1: Understand xTaskNotifyWait timeout behavior
If no notification arrives within the timeout, xTaskNotifyWait returns pdFALSE.
Step 2: Analyze conditional code effect
resetWatchdogTimer() is called only if pdTRUE is returned, so no notification means no reset.
Final Answer:
The watchdog timer is not reset and may trigger a system reset -> Option A
Quick Check:
No notification = no reset = possible system reset [OK]

Quick Trick: No notification means watchdog timer not reset [OK]

Common Mistakes:

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