FreeRTOS xTaskIncrementTick() never gets called.

[peterfurey]

Hi,

I'm using FreeRTOS with SDK_2.0_MK24FN1M0xxx12 on a custom board. And I'm using the default clock configuration created with the new clock tool in KEx Tools v2.0 (FEI MCG Mode, System clock 20.97152 MHz). Also I'm using the default FreeRTOSConfig.h. I wrote a simple task to periodically print the tick count but xTaskIncrementTick() in task.c never gets called and the tick count remains 0. Any ideas on what the problem is? I'm assuming the SysTick interrupt is enabled by default (bad assumption?).

Thank you,

Peter

[DavidS]

Hi Peter,

A simple way to have default clocking to the FreeRTOS example code is just to comment out the BOARD_BootClockRUN(); function call like below:

int main(void)
{
BOARD_InitPins();
//DES test BOARD_BootClockRUN();
BOARD_InitDebugConsole();

If you look into the BOARD_BootClockRUN() function it will safely increase the clock and lastly call following:

    SystemCoreClock = g_defaultClockConfigRun.coreClock; 

When "SystemCoreClock" is used by FreeRTOS and peripheral init routines.  So if you have a UART or SysTick running, it will set according to the "SystemCoreClock" setting.

If commenting BOARD_BootClockRUN() makes things work Ok, then something in the KEx Tool might not have been configured right (or it is wrong).

Regards,

David 

[peterfurey]

Hi David,

Thank you for your response. I tried your suggestion and got the same result. Any other ideas?

Best,

Peter

[DavidS]

Hi Peter,

Can you post your project?

I don't have a K24 but hope to run it on the FRDM-K64F.

Regards,

David

[peterfurey]

Sure, what is the easiest way to do that?

[DavidS]

Hi Peter,

When doing a "Reply" there is a "Use advanced editor"  link to the upper right hand corner.  Click it.

The new window that opens has "Attach" at lower left corner of window.  Click it and then attach the ZIP file.

Regards,

David 

[peterfurey]

Hi David,

My project is attached. Thank you for looking at it.

Best,

Peter

[DavidS · Accepted solution]

Hi Peter,

Your event.c had SysTick_Handler() implemented and this was trumping the port.c SysTick_Handler() function causing the tick not to occur properly.

In event.c I did following:

#if 0         //DES 0=test, 1=default code

void SysTick_Handler(void)

{

    g_timeMilliseconds++;

}

#endif

Re-compile and ran and hit breakpoint inside the port.c void xPortSysTickHandler(void) handler.

BTW: when your event.c SysTick_Handler() used, it is working but other  RTOS scheduler stuff needs xTickCount to be incrementing to allow RTOS to function correctly (I think).

Regards,

David

[peterfurey]

Thank you very much David! That event.c module is something that I imported from the sdcard_fatfs_frdmk64f example project when I was trying to get my sdcard/filesystem interface working but I notice now that that project wasn't using FreeRTOS so there was no conflict. I very much appreciate you taking the time to track that down for me, I was stumped.

Best,

Peter