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MSP432P401R: Any delay function example code from examples?

Tajpeer H
Intellectual 690 points

Part Number: MSP432P401R

Hello,

I want to implement a delay function.

From the SDK, I couldn't get any examples for Delay usage.

Can someone share, any examples or any APis to use for the same purpose. Like having a delay of 1ms or 5ms delay in code.

  • 0
    TI__Genius 14165 points

    Hi Tajpeer,

    would the intrinsic function "__delay_cycles(10);" help you here.

  • 0 in reply to Dietmar Walther
    Intellectual 690 points

    I have seen this API. But couldn't get the implementation details for it.

    And also I have one function which actually requires actually a delay of ~2ms to function as expected. But using this it's not happening.

    And moreover, is this API depends on any parameters like clock?

    Let me know the exact details. Like setting the clock and passing values to this API's etc

  • 0 in reply to Tajpeer H
    TI__Genius 14165 points

    Hi

    its not an API it's a low level macro and yes it depends on frequency.

    Finally it is nothing else than executing 1 cycle instruction (nop) in a loop means if you run a 1 MHz CPU clock the delay would be for 100 cycles ~100us.

    If you want to have a more accurate one you have to use a TimerA and configure it to compare mode and select the count value in relation to the selected clock frequency. If you do this in low power mode and wake-up via interrupt it would safe power too

    Hope this helps.

  • 0 in reply to Tajpeer H
    Guru 41995 points

    I use SysTick to implement an arduino-like millis function The LED toggle is an optional blinky-light. Of course, Millis must be volatile.

    void SysTick_Handler(void)
{
    Millis++;

    if (Millis%10000 == 0)
    {
        // Every 10 seconds
        MAP_GPIO_toggleOutputOnPin(GPIO_PORT_P1, GPIO_PIN0);

    }
}

void Delay(int msec) {
    // Busy wait msec ms
    int starttime = Millis;

    while((Millis - starttime) < msec);
}

  • 0 in reply to Tajpeer H
    Guru 41995 points

    Oh, here is how I set up SysTick:

    // Configure SysTick
    MAP_SysTick_enableModule();
    // 48M = 1 sec, 4.8M = 100ms, 480000 = 10ms...
    MAP_SysTick_setPeriod(48000); // Every 1 msec
    MAP_SysTick_enableInterrupt();

  • 0 in reply to Keith Barkley
    TI__Genius 14165 points

    This thread will be closed due to inactivity since 2 weeks. If anything pops up pls open a new thread.

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