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portSAVE_CONTEXT not used in Cortex m0+? Isn't it needed for ISR wrapper?

Posted by thegi on January 10, 2014

Hi, I found that on Cortex M0 or on Cortex M3 GCC ports, there is no api for portSAVECONTEXT or port RESTORECONTEXT. I guess the task can handle context switching without those api's in arm architecture, but what about ISR? Don't I need to wrap my ISR functions with portSAVECONTEXT and portRESTROECONTEXT, if a context switch will occur inside my ISR function? If so, how should I define my own portSAVECONTEXT and portRESTORECONTEXT for cortex m series?

Thanks, GI

portSAVE_CONTEXT not used in Cortex m0+? Isn't it needed for ISR wrapper?

Posted by rtel on January 10, 2014

No they are not needed. Please read the "Interrupt Service Routines" section of any of the Cortex M0 or M3 documentation pages, and refer to the many examples provided.


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