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LP-MSPM0L1306: About GPIO interrupts

ryota.endo
Intellectual 270 points
Part Number: LP-MSPM0L1306

When an input pin set as GPIO is detected, a function program called "GROUP1_IRQHandler" will be executed if interrupt settings are made.
If I want to specify different interrupt destinations (other than GROUP1_IRQHandler) for PA14 and PA18, what kind of settings should I use and what kind of code should I write?

The specific content is
- If PA14 is input, execute "GROUP1_IRQHandler"
- If PA18 is input, I want to set and execute a program that is a different interrupt destination than "GROUP1_IRQHandler".
In conclusion, I would like to separate the interrupt destination programs between PA14 and PA18.

  • +1
    TI__Mastermind 28426 points

    Hi Ryota,

    We combo all GPIO, COMP and TRING interrupt into GROUP1:

    Thus you need to follow the below step to separate PA14 or PA18 GPIO interrupt:

    Step 1: Check if this intrrupt sourcing from GPIO (GROUP IIDX)

    Step 2: Check  GPIO IIDX

    Example:

    void GROUP1_IRQHandler(void)
{
    /*
     * Get the pending interrupt for the GPIOA port and store for
     * comparisons later
     */
    uint32_t gpioA = DL_GPIO_getEnabledInterruptStatus(GPIOA,
        GPIO_SWITCHES_USER_SWITCH_1_PIN | GPIO_SWITCHES_USER_SWITCH_3_PIN);

    /*
     * Bitwise AND the pending interrupt with the pin you want to check,
     * then check if it is equal to the pins. Clear the interrupt status.
     */
    if ((gpioA & GPIO_SWITCHES_USER_SWITCH_1_PIN) ==
        GPIO_SWITCHES_USER_SWITCH_1_PIN) {
        DL_GPIO_togglePins(
            GPIO_LEDS_USER_LED_1_PORT, GPIO_LEDS_USER_LED_1_PIN);
        DL_GPIO_clearInterruptStatus(GPIOA, GPIO_SWITCHES_USER_SWITCH_1_PIN);
    }

    if ((gpioA & GPIO_SWITCHES_USER_SWITCH_3_PIN) ==
        GPIO_SWITCHES_USER_SWITCH_3_PIN) {
        DL_GPIO_togglePins(
            GPIO_LEDS_USER_LED_3_PORT, GPIO_LEDS_USER_LED_3_PIN);
        DL_GPIO_clearInterruptStatus(GPIOA, GPIO_SWITCHES_USER_SWITCH_3_PIN);
    }

    /* Repeat with GPIOB Port */
    uint32_t gpioB = DL_GPIO_getEnabledInterruptStatus(
        GPIOB, GPIO_SWITCHES_USER_SWITCH_2_PIN);

    if ((gpioB & GPIO_SWITCHES_USER_SWITCH_2_PIN) ==
        GPIO_SWITCHES_USER_SWITCH_2_PIN) {
        DL_GPIO_togglePins(
            GPIO_LEDS_USER_LED_2_PORT, GPIO_LEDS_USER_LED_2_PIN);
        DL_GPIO_clearInterruptStatus(GPIOB, GPIO_SWITCHES_USER_SWITCH_2_PIN);
    }
}

    In this examlpe, we just enable two GPIO interrupt, thus we don't run Step 1 to same some time here.

    You can find this examlpe code in our SDK:

    Thanks!

    Best Regards

    Johnson

  • 0 in reply to Johnson He
    Intellectual 270 points

    It worked fine.
    thank you.

    However, since I do not fully understand the contents of the program, I would like to ask you to specifically explain the following parts.

    if ((gpioA & GPIO_SWITCHES_USER_SWITCH_1_PIN) ==
GPIO_SWITCHES_USER_SWITCH_1_PIN)

    I don't really understand this part.

    Why when detecting an input signal
Will (gpioA & GPIO_SWITCHES_USER_SWITCH_1_PIN) and (GPIO_SWITCHES_USER_SWITCH_1_PIN) be equal?
What kind of movements and changes in values ​​are occurring in the system?
  • 0 in reply to ryota.endo
    TI__Mastermind 28426 points

    Hi Ryota,

    No, GPIOA should run read gpio status code, GPIO_SWITCHES_USER_SWITCH_1_PIN should a pre-define.

    You can try to see the low level code and RTM to understand this logic.

    Thanks!

    Best Regards

    Johnson

  • 0 in reply to ryota.endo
    Guru 40400 points

    The comment is pretty clear:

    /*
         * Bitwise AND the pending interrupt with the pin you want to check,
         * then check if it is equal to the pins. Clear the interrupt status.
         */

    gpioa is a combination of all the pins that may have caused the interrupt, so you need to check each individual bit.

  • 0 in reply to Johnson He
    Intellectual 270 points

    Please let me know if there is any difference in understanding.
    For example
    GPIO PA0 to PA7 exist
    When monitoring this bit by bit,
    0bit: PA0, 1bit: PA1, ~7bit: PA7
    GPIO_SWITCHES_USER_SWITCH_0_PIN = PA0GPIO_SWITCHES_USER_SWITCH_1_PIN =
    If GPIO_SWITCHES_USER_SWITCH_1_PIN = PA1,
    Assuming that PA0 is input, and replacing the contents of the code below with bits (gpioA gets GPIO's pending interrupt)
    ・if ((gpioA & GPIO_SWITCHES_USER_SWITCH_1_PIN)
    == GPIO_SWITCHES_USER_SWITCH_1_PIN)
    →00000001 & 00000001 = 00000001
    →This is executed because it is true.
    After that, if PA1 is input while PA0 continues to detect input, (assuming that DL_GPIO_clearInterruptStatus(GPIOA, GPIO_SWITCHES_USER_SWITCH_0_PIN) is executed in the if statement)
    →00000010 & 00000001 = 00000001
    →This is false and will not be executed.
    Am I correct in my understanding that this is how it works?

  • 0 in reply to ryota.endo
    TI__Mastermind 28426 points

    Hi Ryota,

    Yes, correct.

    Thanks!

    Best Regards

    Johnson