Change interrupt priority

Stefano De Blasiis

I use a TM4C123AH Tiva microcontroller.

Sorry but I did not understand the management of priority interrupt.

I have try to use this code, but it don't work !

IntPrioritySet(INT_UART1, 0x82);
IntPrioritySet(INT_TIMER0A, 0x80);

In my application the serial interrupt routine must be interrupted from the timer interrupt routine, which register I have to change to do this?

Thanks

0 Amit Ashara over 12 years ago

Hello Stefano,

The priority is taken from the upper 3 bits. In this case both of them still have the same priority.

Also the priority means that if both occur together then the one with the highest priority (lower number) will be serviced.

Regards

Amit

0 Stefano De Blasiis over 12 years ago in reply to Amit Ashara

OK Thank you for the speed of response

    IntPrioritySet(INT_UART1,   0x20);
    IntPrioritySet(INT_TIMER0A, 0x00);

In this way the Timer have a upper priority of serial

0 Amit Ashara over 12 years ago in reply to Stefano De Blasiis

Hello Stefano

Yes, the timer will have higher priority if both interrupts come at the same time

Regards

Amit

0 Sanchit Mehra over 11 years ago in reply to Amit Ashara

Expert 1360 points

Hi Amit,

Timer will have higher priority if both interrupts come at the same time ,

But will this cause the Pre-emption of the interrupt, if the Timer Interrupt comes in between ?

How Pre-emption can be achieved , if Timer Interrupt comes in between the lower priority interrupt?

Thanks,

Sanchit Mehra

0 Amit Ashara over 11 years ago in reply to Sanchit Mehra

Hello Sanchit,,

Please refer to the excellent explanation by Austin...

http://e2e.ti.com/support/microcontrollers/tiva_arm/f/908/t/253622.aspx

Regards

Amit

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