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about C6748 interrupt

rookie16157
Prodigy 30 points

Hi

It's my first application on OMAP L-138  so please any help will be greatly appreciated.

I am trying to generate an interrupt using the user buttons(s1-s8) on UI board but I can't find info on how to realize it.

Is there any source code example in C?

thanks!

  • 0
    TI__Mastermind 18130 points

    I don't think it will be easy to generate an interrupt via external GPIO on this board. The GPIO switches coming from switches S1-S8 go in through a GPIO extender (U31) which is connected to the DSP via I2C. Because these are read through the I2C port and they aren't directly connected to the DSP they cannot be used to generate interrupts directly. I think that if you had a task or a periodic function that manually read the status of the pins via the I2C bus you could fake an interrupt, but this would have a latency and would not be instant.