topic ARM Interrupt question... in i.MX RT Crossover MCUs

ARM Interrupt question...

EdSutter — Mon, 17 Aug 2020 17:22:47 GMT

I'm still trying to get my head around the IMXRT processor...

What is the difference between clearing the PRIMASK register and the CPSIDI instruction?

Re: ARM Interrupt question...

kerryzhou — Tue, 18 Aug 2020 03:18:56 GMT

Hi Ed Sutter,

At first, you need to know the PRIMASK detail meaning.

Then, about the CPSID I, please check the following information.

More details, please check the ARM core document.

Wish it helps you!

If you still have questions about it, please kindly let me know.

Best Regards,

Kerry

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Re: ARM Interrupt question...

EdSutter — Tue, 18 Aug 2020 11:47:15 GMT

Hi Kerry,

I read all that; which is precisely why I asked the question...

The documentation --as far as I can tell-- seems to indicate that they both do the same thing...

The TRM for M7 from ARM basically has the same stuff. I'll keep digging, if I find an answer

I'll post it here...

Thanks,

Re: ARM Interrupt question...

kerryzhou — Wed, 19 Aug 2020 02:07:45 GMT

Hi Ed Sutter，

My understanding is:

From the function viewpoint, PRIMASK=1 is the same as CPSID I;

CPSID I is the instruction which can control PRIMASK quickly. If you just use the register code to control PRIMASK, the total execution time should longer than CPSID I.

Wish it helps you!

If you still have questions about it, please kindly let me know.

Best Regards,

Kerry

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