topic Re: GPIO Interrupt not working- falling edge in LPC Microcontrollers

GPIO Interrupt not working- falling edge

vivienwong — Tue, 20 Dec 2016 04:32:55 GMT

Hi,

I am trying to use GPIO interrupt to detect a falling edge. I have GPIO6[13] set up for interrupt. However, whenever GPIO6[3] goes from high to low, no interrupt occurs. My code:

Code never gets to the GPIO6_IRQHandler().

void GPIOInt_Setup()
{
    Chip_GPIO_IntClear(LPC_GPIO_PIN_INT, 6, 13);
    Chip_SCU_GPIOIntPinSel(LPC_GPIO_PIN_INT, 6, 13);
    Chip_GPIO_IntCmd(LPC_GPIO_PIN_INT, 6, 0, GPIOPININT_FALLING_EDGE);

    NVIC_DisableIRQ(PIN_INT6_IRQn);
    NVIC_SetPriority(PIN_INT6_IRQn, configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY);
    NVIC_EnableIRQ(PIN_INT6_IRQn);
}

void GPIO6_IRQHandler (void)
{
NVIC_DisableIRQ(PIN_INT6_IRQn);

    if (Chip_GPIO_IntGetStatus(LPC_GPIO_PIN_INT, 6, 0, 0))
    {
        Chip_GPIO_IntClear(LPC_GPIO_PIN_INT, 6, 0);
    }
}

Any ideas or replies would be very much appreciated.

Thank you

Vivien

Re: GPIO Interrupt not working- falling edge

soledad — Mon, 26 Dec 2016 19:19:37 GMT

Could you let us know which LPC product you are using?

If you are using LPCOpen, can you try using the periph_pinint example?

In addition please check the attached example.

Have a great day,
Sol

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Re: GPIO Interrupt not working- falling edge

vivienwong — Wed, 28 Dec 2016 00:57:19 GMT

Hi,

I am using the LPC1857. I will try out your solution and let you know how it goes.

Thanks

Regards

Vivien