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How can I use more than 3 external interrupts on F28069?

Manh Nguyen Tien
Prodigy 10 points
Other Parts Discussed in Thread: TMS320F28069

Hi,

I am coding Piccolo TMS320F28069 on a machine which have 5 buttons as external inputs.

I have read the Manual of this MCU and I notice that F28069 have only 3 external interrupts, and each external interrupt support only 1 GPIO pin on port A.

So, how can get into interrupt service routines for all 5 button-pushing events?

Thank you for your help,

Sorry for my poor English,

  • 0
    Guru 192875 points

    Hi,

    Manh Nguyen Tien said:
    So, how can get into interrupt service routines for all 5 button-pushing events?

    As you correctly indicated there are only 3 external interrupts and if you want more there aren't! Instead you'll have to implement in the traditional way by regularly scanning 5 input GPIOs & set respective flags. You can use a CPUtimer for giving scanning a higher priority.

    Regards,

    Gautam