Disable interrupts

[isaac]

Posted on November 21, 2017 at 05:47

STMF4 is running and using some of the interrupts.

A a new piece of code needs to be protected from all interrupts but a specific one, which has the highest priority in this application.

The trivial solution: 

Go through the entire NVIC, disable every interrupt which is enabled besides the mentioned one, remember these interrupts and at the end of the code enable those interrupts. 

Is there a nicer solution ( RTOS is not used) ?

Maybe something that utilize the fact that it is the highest level interrupt?

Thanks,

#stm32-interrupts

[David SIORPAES]

Posted on November 21, 2017 at 10:00

You can configure BASEPRI register with:

void __set_BASEPRI ( uint32_t basePri );

This allows you to disable all interrupts with priority level value bigger or equal to a given threshold.

See 

https://www.keil.com/pack/doc/CMSIS/Core/html/group__Core__Register__gr.html#ga360c73eb7ffb16088556f9278953b882

[AvaTar]

Posted on November 21, 2017 at 10:14

I suggest to go to

, and read/download the M4 technical reference manuals - especially the interrupt section.

The ST manuals leave this out, usually.

Then read the F4 ref manual for specifics, and assign your interrupt priorities appropriately.

[Tesla DeLorean]

Posted on November 22, 2017 at 01:42

Could you configure the preemption levels to create the fencing you want, use SCB->SHP to setup where the SVCHandler falls in the hierarchy and then execute the critical code via the SVC?