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How long (cycles) is a yield on a Cortex-M0+?

Posted by ljskinny on May 11, 2017

Hi all,

We have a strange problem in using a time critial interrupt (samplin input) in conjunction with the freeRTOS.

my first question is, how long a yield is, which uses the critical section and disables the global interrupts.

So this could be the reason for blocking the interrupt.

I would expect, that the yield should not block that long the interupt or i am i something missing?

Any ideas are welcome. I have to check, if the RTOS itself is the problem for the issues in our application.

Best regards

Holle


How long (cycles) is a yield on a Cortex-M0+?

Posted by rtel on May 11, 2017

If you are referring to the context switch time then you can find some information for a Cortex-M3 on the link below. An M0 will be a bit slower due to its more limited instruction set.

Also unlike an M3, the M0 will globally disable interrupts in a critical section - do you have long critical sections? (taskENTERCRITICAL()/taskEXITCRITICAL)

http://www.freertos.org/FAQMem.html#ContextSwitchTime


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