Kinetis MicrocontrollersのトピックRe: GPIO_PortClearInterruptFlags not working

GPIO_PortClearInterruptFlags not working

rudycoppens — Mon, 10 Sep 2018 14:24:59 GMT

Hardware:

- MKE14F16

Software:

MCUXpresso IDE 10.1.1

I made a simple program when there is an interrupt on pin 7 from port A clear the interrupt pin.

But the function "GPIO_PortClearInterruptFlags(GPIOA, 1U << 7U);" doesn't clear the flag...

Bit eight stays high.

void IRQ_HANDLER_PORT_A(void)
{

   uint32_t Interrupt_Flags_A = GPIO_PortGetInterruptFlags(GPIOA);
   if((Interrupt_Flags_A >> 7u) & 1)
   {
      GPIO_PortClearInterruptFlags(GPIOA, 1u << 7);
      Interrupt_Flags_A = GPIO_PortGetInterruptFlags(GPIOA);
      DisableIRQ(PORTA_IRQn);

}

Re: GPIO_PortClearInterruptFlags not working

jorge_a_vazquez — Wed, 12 Sep 2018 22:28:07 GMT

Hi Rudy Coppens

Could you clarify how you set your interruption in the GPIO module? Will it detect a falling edge? also, are you able to see that you get into the interrupt handler?

I use the code that you post and I can see that the interrupt flag is correctly cleared.

Best regards

Jorge Alcala

Re: GPIO_PortClearInterruptFlags not working

rudycoppens — Fri, 14 Sep 2018 08:21:28 GMT

Thanks for your reaction!

Yes I get into the interrupt handler. I putted there a break point and step through the code.

That's why I did two times the reading of the flags. First, is the flag high than a clear on the interrupt flag and a reading again.

It is always high... Maybe it takes some more time to clear the flag?