Enabling configGENERATE_RUN_TIME_STATS on FreeRTOS MicroBlaze breaks the OS tick timer

Kernel
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1

Hello!

I am running into a problem trying to analyze task preemption in a FreeRTOS application running on MicroBlaze.

I am using Vitis 2020.2 with FreeRTOS 1.7 and freertos_hello_world.c sample app.

When I have “generate_runtime_stats” set to 0 (sets configGENERATE_RUN_TIME_STATS to 0) in the BSP OS configuration the app runs fine. However, when I do enable it (configGENERATE_RUN_TIME_STATS 1) the OS tick / timer interrupt stops working. The main symptom is that tasks block forever in vTaskDelay().

I placed a breakpoint in vPortTickISR() and it never gets hit indicating that the timer interrupt is disabled, or all interrupts are disabled.

I verified that the timer interrupt handler is installed via Xilinx API.

Has anyone here seen this or similar issue?

2

Is the clock used for the run time stats the same as that used to generate the RTOS tick? If so, initialising the run-time stats might undo any configuration already done to generate the tick (just guessing).

3

Did you enable/define configASSERT and is it hit ?
Maybe there is an issue occurring while starting the scheduler and the SysTick isn’t started. You might also try to step into the vTaskStartScheduler code with a debugger given that everything is fine (including task stack sizes) until starting the scheduler.