K82: ARM errata 838869 and SysTick handler

EugeneHiihtaja — Tue, 04 Sep 2018 11:51:59 GMT

Hi !

I can see _DSB() entry in almost all interrupt handlers for fix errata case.

But not in TickTimerHandler in FreeRTOS port.c:

void xPortSysTickHandler(void)
{
uint32_t ulDummy;

   ulDummy = portSET_INTERRUPT_MASK_FROM_ISR();
   {
   /* Increment the RTOS tick. */
      if (xTaskIncrementTick() != pdFALSE)
      {
         /* Pend a context switch. */
         portNVIC_INT_CTRL_REG = portNVIC_PENDSVSET_BIT;
      }
   }
   portCLEAR_INTERRUPT_MASK_FROM_ISR(ulDummy);

// ???

}

Even if I unroll all macros, _DSB is not visible.

Or errata is not effect special handlers ?

By the way, do you have idea when new SDK will be released with new FreeRTOS 10.1.0 for K82 ?

Regards,

Eugene

Re: K82: ARM errata 838869 and SysTick handler

victorjimenez — Thu, 06 Sep 2018 14:53:22 GMT

Hello Eugene,

DSB is used before ISR return only if ISR's last operation is accessing peripheral registers.

Regarding your other question, we don't have a date for the release of the SDK with the new version of FreeRTOS.

Hope it helps!

Victor.

-----------------------------------------------------------------------------------------------------------------------

Note: If this post answers your question, please click the Correct Answer button. Thank you!

-----------------------------------------------------------------------------------------------------------------------

topic K82: ARM errata 838869 and SysTick handler in Kinetis Microcontrollers

K82: ARM errata 838869 and SysTick handler

Re: K82: ARM errata 838869 and SysTick handler