GPIO Interrupt in MCUXpresso

alejandrovelez — Mon, 27 May 2019 19:43:52 GMT

Hello,

I'm trying to start a new project and add some peripherals, one of them is the gpio interrupt, but i can't get it to work properly. If i import the example it works fine, but when add as a peripheral it doesn't work.

I'm working with a FRDM-K64F and want to make an interrupt with the SW3 switch of the board wich is in the PIN 6 of PORTC.

This is the generated code in

peripherals.h:

/* Alias for GPIOC peripheral */
#define GPIO_BUTTON_GPIO GPIOC
/* Alias for PORTC */
#define GPIO_BUTTON_PORT PORTC
/* GPIO_BUTTON interrupt vector ID (number). */
#define GPIO_BUTTON_IRQN PORTC_IRQn
/* GPIO_BUTTON interrupt handler identifier. */
#define IRQ_SW2 PORTC_IRQHandler

peripherals.c:

void GPIO_BUTTON_init(void) {
/* Make sure, the clock gate for port C is enabled (e. g. in pin_mux.c) */
/* Enable interrupt PORTC_IRQn request in the NVIC */
EnableIRQ(PORTC_IRQn);
}

/***********************************************************************************************************************
* Initialization functions
**********************************************************************************************************************/
void BOARD_InitPeripherals(void)
{
/* Initialize components */
PIT_1_init();
GPIO_BUTTON_init();
}

/***********************************************************************************************************************
* BOARD_InitBootPeripherals function
**********************************************************************************************************************/
void BOARD_InitBootPeripherals(void)
{
BOARD_InitPeripherals();
}

and in

pinmux.h:

#define BOARD_INITPINS_SW2_GPIO GPIOC /*!<@brief GPIO device name: GPIOC */
#define BOARD_INITPINS_SW2_PORT PORTC /*!<@brief PORT device name: PORTC */
#define BOARD_INITPINS_SW2_PIN 6U /*!<@brief PORTC pin index: 6 */

pinmux.c:

void BOARD_InitPins(void)
{
/* Port C Clock Gate Control: Clock enabled */
CLOCK_EnableClock(kCLOCK_PortC);

gpio_pin_config_t SW2_config = {
.pinDirection = kGPIO_DigitalInput,
.outputLogic = 0U
};
/* Initialize GPIO functionality on pin PTC6 (pin 78) */
GPIO_PinInit(BOARD_INITPINS_SW2_GPIO, BOARD_INITPINS_SW2_PIN, &SW2_config);

gpio_pin_config_t LED_GREEN_config = {
.pinDirection = kGPIO_DigitalOutput,
.outputLogic = 1U
};

/* PORTC6 (pin 78) is configured as PTC6 */
PORT_SetPinMux(BOARD_INITPINS_SW2_PORT, BOARD_INITPINS_SW2_PIN, kPORT_MuxAsGpio);

/* Interrupt configuration on PORTC6 (pin 78): Interrupt on falling edge */
PORT_SetPinInterruptConfig(BOARD_INITPINS_SW2_PORT, BOARD_INITPINS_SW2_PIN, kPORT_InterruptFallingEdge);

PORTC->PCR[6] = ((PORTC->PCR[6] &
        /* Mask bits to zero which are setting */
        (~(PORT_PCR_PS_MASK | PORT_PCR_PE_MASK | PORT_PCR_ISF_MASK)))

        /* Pull Select: Internal pullup resistor is enabled on the corresponding pin, if the
        * corresponding PE field is set. */
        | (uint32_t)(kPORT_PullUp));
}

Then implement my IRQ handler in main.c:

void IRQ_SW2(void){
    /* Clear external interrupt flag. */
     GPIO_PortClearInterruptFlags(GPIOC, 1U << 6);
     /* Change state of button. */
     sw2_interrupt = true;
    /* Add for ARM errata 838869, affects Cortex-M4, Cortex-M4F Store immediate overlapping
     exception return operation might vector to incorrect interrupt */
    #if defined __CORTEX_M && (__CORTEX_M == 4U)
     __DSB();
    #endif
}

But it never enter in this function handler.

When push the button, it always goes directly to:

And stays there forever.

My pins configuration:

What could I be missing?

Thanks and regards

Re: GPIO Interrupt in MCUXpresso

danielchen — Tue, 28 May 2019 07:43:31 GMT

Hi Alejandro:

SW3 in Frdm-k64 board is very special, it connects to NMI.

I would suggest you try SW2.

Regards

Daniel

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Re: GPIO Interrupt in MCUXpresso

alejandrovelez — Tue, 28 May 2019 13:56:38 GMT

Hi danielchen@fsl‌, Thanks for your answer, seems i've been pressing the wrong switch :smileyconfused:.

Regards

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