[Solved] You wrote the following code to get the task list but the output is garbage or empty. What is the most likely cause? char *buffer; vTaskList(buffer); printf("%s", buffer); | FreeRTOS

FreeRTOS - Debugging and Monitoring

You wrote the following code to get the task list but the output is garbage or empty. What is the most likely cause?

char *buffer;
vTaskList(buffer);
printf("%s", buffer);

ABuffer pointer is uninitialized and does not point to valid memory

BvTaskList() requires two arguments, so this call is invalid

CThe buffer size is too large causing overflow

DvTaskList() only works if tasks are suspended

Step-by-Step Solution

Solution:

Step 1: Check buffer initialization
The buffer pointer is declared but not assigned memory, so it points to an unknown location.
Step 2: Understand vTaskList() usage
vTaskList() writes to the buffer pointer, so it must point to valid writable memory (like an array).
Final Answer:
Buffer pointer is uninitialized and does not point to valid memory -> Option A
Quick Check:
Uninitialized buffer pointer causes invalid output [OK]

Quick Trick: Always allocate buffer memory before passing to vTaskList() [OK]

Common Mistakes:

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You wrote the following code to get the task list but the output is garbage or empty. What is the most likely cause?