AM2432: FreeRTOS configuration for product and cpu load

Hi Moonil,

CPU and Task loading are documented here:

• https://software-dl.ti.com/mcu-plus-sdk/esd/AM243X/08_02_00_31/exports/docs/api_guide_am243x/KERNEL_DPL_TASK_PAGE.html
• https://software-dl.ti.com/mcu-plus-sdk/esd/AM243X/08_02_00_31/exports/docs/api_guide_am243x/KERNEL_FREERTOS_IMPORTANT_GUIDELINES_PAGE.html#autotoc_md337

Moonil Heo said:

and the system is not properly working.

Moonil Heo said:

All those tasks' implementation was running on other OS like cesiumOS. At that time, this kind of high cpu load was not found. Their implementation is almost the same except for calling FreeRTOS APIs.

Do you mean your code isn't working as expected or the CPU load measurement isn't working?

These tools might be helpful for debugging your problem:

• https://software-dl.ti.com/mcu-plus-sdk/esd/AM243X/08_02_00_31/exports/docs/api_guide_am243x/KERNEL_FREERTOS_IMPORTANT_GUIDELINES_PAGE.html#autotoc_md365
• https://software-dl.ti.com/mcu-plus-sdk/esd/AM243X/08_02_00_31/exports/docs/api_guide_am243x/KERNEL_FREERTOS_IMPORTANT_GUIDELINES_PAGE.html#autotoc_md366

Moonil Heo said:

Should I modify some defined value in "FreeRTOSConfig.h"?

CPU and Task loading should be enabled by default.

Regards,
Frank

Hi Frank,

Thank you for sharing the information.

My issue is that the CPU load is too high even though we didn't do many things. I am using "TaskP_loadGetTotalCpuLoad" for CPU load measurement. This measurement function itself seems no problem.

Most tasks are idle in the current implementation and only two or three tasks are busy as you can see in the picture I added to this thread. They are working with 125us timer interrupt (timer ISR post semaphore to task).

r5f0 core has an 800Mhz CPU clock rate, so we expected very less CPU load in the current implementation but we found CPU load is abnormally high.

Now, we have to find the reason causing this issue, because we didn't implement the main features yet but the CPU load has already been over 98%. 

Frank Livingston said:

CPU and Task loading should be enabled by default.

What do you mean?  CPU and Task loading? configOPTIMIZE_FOR_LATENCY is 0 in my setting so configGENERATE_RUN_TIME_STATS is enabled by default. I didn't change anything in "FreeRTOSConfig.h" of SDK except for changing "configMAX_PRIORITIES" to 32. 

Input clock frequency in syscfg is also the same as the SDK example.

I would appreciate it if you let me know checkpoints related to any factors impacting CPU load in FreeRTOS configuration, syscfg or else.

Regards,

Moonil

Hi Moonil,

Sorry for the delayed response. Is this still an issue?

Moonil Heo said:

What do you mean?

I mean no code updates are required for CPU and Task loading to be enabled.

Moonil Heo said:

I would appreciate it if you let me know checkpoints related to any factors impacting CPU load in FreeRTOS configuration, syscfg or else.

I can't think of any checkpoints.

Are you certain your tasks are running at the expected frequency? You might consider driving SOC GPIOs in the task to confirm timing. Maybe one of your tasks it executing more frequently than expected.

Have you measured the CPU cycles spent doing the work in the tasks?

If you can share a toy example demonstrating the problem I can help root cause the problem.

Regards,
Frank