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MSP432 RTC Interrupt

Luca Palombella
Intellectual 560 points

Hi,

i'm using rtc interrupt to have an event every 1 minute (default setting of rtc is minute changed event). It works and i have no problem. Is it possible using rtc interrupt for second changed event? For example every 30 seconds i want p1.0 led on.

Thanks,

Luca

  • 0
    TI__Mastermind 25045 points

    Hi Luca,

     Yes this is possible. The easiest way is just to enable the RT1PS interrupt. Please take a look at the Technical Reference Manual Section 18.2.6 Real-Time Clock Interrupts and let me know if you need some help writing this code.

      "RT1PSIFG can be used to generate interrupt intervals selectable by the RT1IP bits. RT1PS is sourced with the output of RT0PS, which is 128 Hz (32768/256 Hz). Therefore, intervals of 64 Hz, 32 Hz, 16 Hz, 8 Hz, 4 Hz, 2 Hz, 1 Hz, or 0.5 Hz are possible. Setting the RT1PSIE bit enables the interrupt."

      Hopefully this helps.

        David

  • 0 in reply to DavidL
    Intellectual 560 points

    ok i'll read the manual. Could i have A simple example of this interrupt? led on off every X seconds. Thanks Luca

  • 0 in reply to DavidL
    Intellectual 820 points
    The wording of this portion of the RTC documentation made me think that this would only change the RTC Ready interrupt interval. That's good and all, but I'm looking to do the same as the OP with the RTC and have it interrupt the system on a time under 1 minute.

    For instance, lets say I would want a periodic interrupt of the system at 90 seconds. To achieve this, I believe I'd have to set the Alarm interrupt signal for 1 minute, and then have a counter with this RTC Ready interrupt signal that keeps track of 30 more interrupts at 1s each, and on the last one, signal the system to do something.

    Its possible to achieve a seconds-based signaling with the interrupts, but I think this RTC module needed to go one more step and have it look for Seconds for its Alarm feature.

    If I'm missing something pertaining to this, please let me know.

    Thanks,

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