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Interrupt priority on omap3703

learnom learnomg2
Prodigy 140 points

Hi All,

I see in the datasheet that we can change the priority of interrupt.

Can anyone share some information on how to set the priority of an interrupt? any sample code.

I want to increase it to high priority.

Thanks.

learnom

  • 0
    TI__Guru**** 161600 points

    Hello learnom,

    There is a set of (96) registers INTCPS_ILRm that are used to set the priority of the interrupts in OMAP35x devices:

    this is done by configuring the INTCPS_ILRm[7:2]PRIORITY bit field. Setting this bit field to 0x0 gives the interrupt the highest priority; setting it to 0x3F gives the lowest priority.

    You can check Section 10.4.1.3 Priority Sorting in OMAP35x TRM (http://www.ti.com/lit/ug/spruf98x/spruf98x.pdf) for more information.

    Regarding sample code (if any) I suggest you post in the dedicated OMAP35x Processors Forum (http://e2e.ti.com/support/dsp/omap_applications_processors/f/447.aspx).

    Best Regards,

    Yordan

  • 0 in reply to Yordan Kovachev
    Prodigy 140 points

    Thanks Yordan.

    I have put the post in omap3.

    Regards,

    learnom

  • 0 in reply to Yordan Kovachev
    Prodigy 140 points

    Thanks Yordan.

    I added the code to modify the priority of the interrupt by setting INTCPS_ILRm.

    I am just wondering, If the pin is configured as GPIO, can i still change the priority of it? As i dont see a difference, and the input pin is configured as GPIO. Any suggestions please?

    Regards,

    learnom

     

  • 0 in reply to learnom learnomg2
    TI__Guru**** 161600 points

    Hello,

    You should be able to change priority of a pin when it is configured as GPIO.

    Have you tried setting the corresponding MPU_INTC.INTCPS_THRESHOLD[7:0] PRIORITYTHRESHOLD bit field (for guidance see  Section 10.4.1.2.2 Priority Masking of the OMAP35x TRM). According to TRM: To enable faster processing of high-priority interrupts, a programmable priority masking threshold is provided (the MPU_INTC.INTCPS_THRESHOLD[7:0] PRIORITYTHRESHOLD field).

    Best Regards,

    Yordan