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Nested Interrupt CM3

Nino Caruso
Note: This was originally posted on 29th May 2012 at http://forums.arm.com

Hello everyone,
i just want to know how does nesting interrupt work on Cortex M3.
Register PRIMASK, BASEPRI and FAULTMASK are usefull if i want to ignore ,when occurs, certain interrupt (by setting a priority level threshold) ignore= interrup not accepted,  interrupt not nested
Register like SETENA enable or disable specific interrupt ( by # )
When the processor  is handling an exception and comes an interrupt that has upper priority level, the current exception is nested (save register etc etc ) and the new exception is executed. If the priority of the new interrupt is lower , the NVIC will not nest the interrupt, it will be ignored.

is correct what i've understood? is there something that i miss?



thank you in advance
Nino

ps i'm sorry for my bad english
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  • Note: This was originally posted on 12th June 2012 at http://forums.arm.com

    Questions about WICSENSE,WICLOAD,WICMASK.

    both WICMASK and WICSENSE are used to indicate that the WIC must wake up in response to the corresponding WICINT signal, but in particular WICSENSE what does it do?

    WICMASK comes from the core of CM3(from NVIC) to WIC but what make me confuse is that WICSENSE comes out from the WIC to i don't know where.

    How can WICLOAD is usefull(togheter WICMASK) to enable certain interrupt or event to cause a wakeup?

    WIC works only when there is deep sleep, normal sleep don't causes power down to the nvic like deep sleep, right?

    Thank you in advance
Reply
  • Note: This was originally posted on 12th June 2012 at http://forums.arm.com

    Questions about WICSENSE,WICLOAD,WICMASK.

    both WICMASK and WICSENSE are used to indicate that the WIC must wake up in response to the corresponding WICINT signal, but in particular WICSENSE what does it do?

    WICMASK comes from the core of CM3(from NVIC) to WIC but what make me confuse is that WICSENSE comes out from the WIC to i don't know where.

    How can WICLOAD is usefull(togheter WICMASK) to enable certain interrupt or event to cause a wakeup?

    WIC works only when there is deep sleep, normal sleep don't causes power down to the nvic like deep sleep, right?

    Thank you in advance
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