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RM46L852: How to enable/disable Interrupt notification from a HET pin

Arthur Yang
Prodigy 20 points
Part Number: RM46L852


Hello, Friends

I involved in a project (RM46L852), that use a HET pin ( hetPort1, PIN_HET_7) as interrupt pin. 

For the GIO, I can use below function to get notification, 

void gioEnableNotification(gioPORT_t *port, uint32 bit)
{
/* USER CODE BEGIN (11) */
/* USER CODE END */

    if (port == gioPORTA)
    {
        gioREG->ENASET = (uint32)1U << bit;
    }
    else if (port == gioPORTB)
    {
        gioREG->ENASET = (uint32)1U << (bit + 8U);
    }
    else
    {
        /* Empty */
    }
}
 

But how about HET pin, which function should be use, or it needs add USER CODE in above function?

Thanks!

  • 0
    TI__Guru**** 198766 points

    Hi Arthur,

    If the NHET pin is used as GPIO pin, the input interrupt is not supported.

  • 0 in reply to QJ Wang
    Prodigy 20 points

    Hi, QJ

    Thanks for your quick reply!
    I see. Actually, we use a HET pin (eg N2HET1[7]) to catch the external pulse to see if the pulse arrives, and to get the notification.
    Typically, the pulse width is about 50us, but it is variable.
    Besides the interrupt method, can I use the HET pin to catch the pulse?

    Regards, 

    Arthur

  • 0 in reply to Arthur Yang
    TI__Guru**** 198766 points

    HI Arthur,

    For using the pins as N2HET pins, the interrupts can be generated by any instruction that has an interrupt enable bit in its instruction format.

    When the interrupt condition in an instruction is true and the interrupt enable bit of that instruction is set, an interrupt flag is then set in the N2HET Interrupt Flag Register (HETFLG). The address code for this flag is determined by the five LSBs of the current timer program address. The flag in the N2HET Interrupt Flag Register (HETFLG) is set even if the corresponding bit in the N2HET Interrupt Enable Set Register (HETINTENAS) is 0. To generate an interrupt, the corresponding bit in the N2HET Interrupt Enable Set Register (HETINTENAS) must be 1. In the N2HET interrupt service routine, the main CPU must first determine which source inside the N2HET created the interrupt request. 

  • 0 in reply to QJ Wang
    Prodigy 20 points

    Hi, QJ

    Ok, I can follow it and try to create the interrupt. 

    Thanks for your always support!

    Best regards, 

    Arthur