External interrupts priority in SM320F28335-EP 32 bit DSC.

izhar ul haq

Prodigy 10 points

Dear All EXPERT Engineerz,

I am fresh Electronics Engineer and facing some problems given below....plzz help me in this regard.

How to give priority to external interrupts coming from 4 external peripheral though Quad UART to F28335 DSC.

There are 8 external interrupts in F28335 DSC. I am using XINT3, XINT4, XINT5, AND XINT6.

In its datasheet there are no info about the register used for interrupt priority.

Plzz write in detail your effort will highly appreciated .....

Many thnx in advance.

Engr.Izhar Ul Haq

over 14 years ago

newtothis over 14 years ago

Intellectual 970 points

I dont think you can assign priority levels. According to page 125 of http://www.ti.com/lit/ug/sprufb0d/sprufb0d.pdf, priority levels are pre-assigned to various interrupts within a group. Others can confirm this, but one way to get priority behaviour is to acknowledge the interrupt as soon as you enter it and not wait until the end of the interrupt. Something along the lines of PieCtrlRegs.PIEACK.all = PIEACK_GROUP3; This way other interrupts (ones with "higher" priority at least in the context of your code) can be executed during the execution of one.

The following post may be relevant:

http://e2e.ti.com/support/microcontrollers/tms320c2000_32-bit_real-time_mcus/f/171/t/126176.aspx#451418

C2000™︎ microcontrollers

C2000 microcontrollers forum

External interrupts priority in SM320F28335-EP 32 bit DSC.