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OMAP3530 Interrupts (Gumstix Overo Water with Palo43)

John Thomas43830
Prodigy 130 points
Other Parts Discussed in Thread: OMAP3530

Looking at the pin assignments for the Gumstix and its extension card, there are three assigned interrupts.  One for a digital camera, one for a touch screen, and one for Ethernet.  They all use GPIO pin assignments on the OMAP3530.  Does this mean that these interrupts may take more than six clock cycles to get an OMAP response?  I also note from page 1193 of the OMAP Tech Ref Manual that up to six GPIO lines can be assigned to the MPU INTCPS environment, is this true?

Thanks,

John Thomas

  • 0
    Genius 3685 points

    Hi John,

    You are right, that the three suggested pins are just "ordinary" GPIO pins, and you could use them (or some others) for whatever you want. I'm not sure about your reference to page 1193 in the TRM (seems like you have another version than mine), but I think the 6 MPU INTCPS signals you refer is related to the 6 GPIO blocks each containing 32 GPIO's. You can get Interrupts from all GPIOs, and are not in any way limited to only 6 GPIO interrupt lines. THis is just internal wiring of the OMAP chip. More info to be found about this in the Interrupt and GPIO chapters (ch10 and ch25) of the TRM ...

    Hope this helps you forward? Good luck
      Søren

  • 0 in reply to Soren Steen Christensen
    Prodigy 130 points

    Hi Soren,

    The Technical Reference Manual version is spruf98d and was published in October 2009.  The page I referenced is within Chapter 10.  I will take a look at Chapter 25 as well.  Thank you for your input.

    I was hoping I might hear from Brandon Azbell of TI to get further insight.

     

    Thanks,

    John Thomas