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CCS/MSP432P401R: Enable&disable interrupts

Keith Xia
Intellectual 340 points

Part Number: MSP432P401R

Tool/software: Code Composer Studio

Hi all,

I am trying to enable the GPIO interrupts for a certain amount of time (noted as t1). For example, I initiate the GPIO interrupts and then I initiate the SysTick with frequency 36MHz. I would love to have my t1-2.65ms. Therefore, from t=0 to t=.65ms, some of my GPIOs will enable the interrupts, and it will execute some actions. However, at the moment of t=t1=2.65ms, I would love to disable the GPIOs and stop all the current operations.

I know there is a function in DriverLib that says MAP_GPIO_dIsableInterrupt() but I really wonder where I should place this function and what else I should be coding to accommodate the situation that the Interrupts will be called off after 2.65ms.

So far I am thinking about something like,

//enable the clock and GPIO interrupts;

while (1){

if (clock value >count number equivalent to 2.65ms){

MAP_GPIO_dIsableInterrupt()

}

}

Does it look like a good approach? What else can I do to make it work?

BR,

Keith

  • 0
    Guru 41995 points

    While it is essentially a NOP after the interrupts are disabled, I don't think it is very elegant to just keep disabling interrupts, I think it a bit better to:

    disable interruts

    wait X seconds

    enable interrupts.

  • 0 in reply to Keith Barkley
    Intellectual 340 points

    I am sorry but I don't really get the logic you were applying here. I want to activate the GPIO interrupts immediately in order to receive incoming signals from the GPIOs and execute the interrupts. After 2.65ms the interrupts will be disabled. After 2.65ms no matter what signal flows into the system it will not change anything. 

    However, it seems like you disable the interrupts and then wait for a bit, then you enable the interrupts, which is not what I want at all

  • 0 in reply to Keith Xia
    Guru 41995 points

    OK

    Enable interrupts

    wait X seconds

    disable interrupts

    You can also set a global flag which you check at the start of your interrupt routine. Depending on the state of the flag, you return immediately or finish interrupt processing.

  • 0 in reply to Keith Barkley
    Intellectual 340 points

    I am thinking about editing my while loop like this.

    while (/*time <2.65ms*/){

    system works}

    will this solve my problem?

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