[Solved] Given this code snippet enabling trace hooks and starti... // Task creation and scheduler start vTaskStartScheduler();What will happen if configUSE_TRACE_FACILITY is not set to 1 in FreeRTOSConfig.h? | FreeRTOS

FreeRTOS - Debugging and Monitoring

Given this code snippet enabling trace hooks and starting FreeRTOS+Trace recording:

vTraceEnable(TRC_START);
// Task creation and scheduler start
vTaskStartScheduler();

What will happen if configUSE_TRACE_FACILITY is not set to 1 in FreeRTOSConfig.h?

ATrace recording will start but with limited data

BTrace recording will not start and no trace data will be collected

CThe code will fail to compile

DThe scheduler will not start

Step-by-Step Solution

Solution:

Step 1: Understand configUSE_TRACE_FACILITY role
This config enables trace hooks; if disabled, trace functions do nothing.
Step 2: Analyze effect on vTraceEnable(TRC_START)
Without enabling trace facility, vTraceEnable(TRC_START) runs but no trace data is collected; code compiles and scheduler runs normally.
Final Answer:
Trace recording will not start and no trace data will be collected -> Option B
Quick Check:
Trace facility disabled = no trace data [OK]

Quick Trick: Enable configUSE_TRACE_FACILITY to collect trace data [OK]

Common Mistakes:

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Given this code snippet enabling trace hooks and starting FreeRTOS+Trace recording: