Unprivileged task doesn't work with configUSE_TICKLESS_IDLE set to 1

Kernel
1

Hello.
I am trying to implement MPU mode and TICKLESS mode (for power saving) on cortex-M4 mcu. When I launch the execution, only the privileged tasks remain active after the first vTaskDelay(the first call to vPortSuppressTickAndSleep). Does anyone know if unprivileged tasks can work with configUSE_TICKLESS_IDLE set to 1? or Why it does not work?

2

Hi @myriamKC,

The CM4 MPU port doesn’t support tickless idle. Have you modified the official port? If so, what modifications did you make? Or are you using a 3rd party port – one not provided by FreeRTOS?

1 Like
4

Yes, I have modified the official port. I add the implementation of vPortSuppressTicksAndSleep of CM4F port in port.c of CM4 MPU

5

I do not think we have tested MPU ports with tickless idle. Just to make sure - does your code work when you disable tickless idle? And where did you get the implementation of vPortSuppressTickAndSleep from?

6

It should work on the MPU port. As Gaurav said please make sure the application works with tickless idle disabled.

Do you mean portable/GCC/ARM_CM4F/port.c? Did you copy all of the code blocks marked with #if ( configUSE_TICKLESS_IDLE == 1 ) ?

Did you copy this block of code inside vPortSetupTimerInterrupt()?

Which kernel version are you using? Where did you get it?