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Migrating from CM3 to CM0

Posted by alainm3 on November 7, 2014

Hi, I just ported FreeRTOS from CortexM3 (STM32F101) to CortexM0 (STM32F030), I copied the files from FreeRTOS/Source/portable and it is working with just minor adjustments ;)

Please I need help in just two items: 1) Interrupt configurations has visible changed, what do I have to change and is there any recomended configuration? 2) is there anything else that I must be aware of?

Thanks, Alain

Migrating from CM3 to CM0

Posted by edwards3 on November 7, 2014

Did you see this page http://www.freertos.org/FreeRTOS-for-STM32F051-Cortex-M0-IAR.html

Migrating from CM3 to CM0

Posted by alainm3 on November 7, 2014

Yes thanks, but I have not fount anything about interrupt priority configuration. CM3 had a rather complex priority setup, CM0 is simpler and I would like to have some better explanation about it.

Anyway, if I don't find any better explanation I will copy from that example and use it more or less "as is"...


Migrating from CM3 to CM0

Posted by rtel on November 8, 2014

You are correct - the M0 is much simpler - primarily as there is no BASEPRI register, so the complexity of getting the masks right that you have in the M3/4 don't exist in the M0/0+. The interrupt enable in the core is used instead of the mask in the NVIC.


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