Grouped External Interrupt

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Grouped External Interrupt

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cleonbrown
Contributor I

I am using LPC1833 Gruop Interrupt, I have 16 external interrupt spread across 2 ports (port 5 and 2) grouped into in one group (GROUP 0). They are pullup resistors on all 16 inputs and it works fine; however, if there is a bad input that pull any of the input low it prevents the microcontroller from getting additional interrupts on the remaining pins regardless of their state.

is this a limitation of the group interrupt?

Please see code below:


void Configure_GroupInt_GpIOs(void)
{
      uint8_t i;

      for( i=0; i <= 15 ;i++ )
      {
            if(i == 7)
            {
                  Chip_GPIO_SetPinDIRInput(LPC_GPIO_PORT, 5, 12);
                  Chip_GPIOGP_SelectLowLevel (LPC_GPIOGROUP, 0, 5, 1 << 12);
                  Chip_GPIOGP_EnableGroupPins(LPC_GPIOGROUP, 0, 5, 1 << 12);
            }
            else
            {
                  Chip_GPIO_SetPinDIRInput(LPC_GPIO_PORT, 2, i);
                  Chip_GPIOGP_SelectLowLevel (LPC_GPIOGROUP, 0, 2, 1 << i);
                  Chip_GPIOGP_EnableGroupPins(LPC_GPIOGROUP, 0, 2, 1 << i);
            }
      }
      Chip_GPIOGP_SelectOrMode(LPC_GPIOGROUP, 0);
      Chip_GPIOGP_SelectEdgeMode(LPC_GPIOGROUP, 0);

      /* Enable Group GPIO interrupt 0 */

      NVIC_EnableIRQ(GINT0_IRQn);
}

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jeremyzhou
NXP TechSupport
NXP TechSupport

Hi Cleon Brown,
Thank you for your interest in NXP Semiconductor products and
the opportunity to serve you.
Actually, I'm not clear on the below statement, and I was wondering if you can explain and show me the testing result.

however, if there is a bad input that pull any of the input low it prevents the microcontroller from getting additional interrupts on the remaining pins regardless of their state.
Have a great day,

TIC

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