Use Case
Your senior engineer left.
Their knowledge didn't.
100K lines of STM32 + FreeRTOS code for a railway signal controller. The lead engineer is gone. No documentation. A new hire needs to make changes.
EmByte Code Intelligence
> What does signal_controller_task do?
FreeRTOS task at priority 5. Reads interlocking commands from the CAN bus, validates them against the route table in flash, and drives the signal output GPIOs.
Communicates with watchdog_task via message queue. Fail-safe timeout: 2 seconds.
See signal_controller.c:89-247
> Is there a priority inversion risk?
Yes. signal_controller_task (priority 5) and data_logger_task (priority 2) both use mutex_flash_access.
If data_logger holds the mutex during a long flash write, signal_controller will be blocked.
FreeRTOS priority inheritance is NOT enabled for this mutex.
This is a potential safety issue.
Recommendation: Enable priority inheritance via xSemaphoreCreateMutex() or switch to xSemaphoreCreateRecursiveMutex().
> I need to add a new signal aspect (flashing yellow)
Based on the codebase analysis, you need to modify:
1. signal_types.h — add SIGNAL_FLASHING_YELLOW to enum
2. signal_controller.c — add case in process_signal_command()
3. gpio_output.c — add flashing pattern with timer
4. test_signal_controller.c — add test cases
MISRA impact: 0 new violations expected. The flashing timer pattern should use TIM3 (currently unused).
EmByte indexes your codebase with hardware context.
RTOS task structure and priorities
Peripheral usage and pin assignments
Interrupt routing and ISR handlers
Clock tree configuration
Shared resources and mutex usage
Safety-critical code paths
Hardware dependency map
DMA channel assignments
Months → Days
Onboarding time for new engineers joining embedded teams
Zero
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