topic Re: Use of GPIO Interruptions in Kinetis Microcontrollers

Use of GPIO Interruptions

pablo_cosgaya — Tue, 20 Aug 2019 10:56:30 GMT

Hello,

I've been trying to setup interruptions on PTB5 (Pin 12) of MKE16Z64VLD but it is not working. I am following the example called gpio_input_interrupt present on the SDK but still I cannot get it to work.

void PORTBCD_IRQHandler(void)
{
/*GPIOB5 PORTB PIN 12*/
GPIO_PortClearInterruptFlags(GPIOB, 1U << 5U);
INT= 1;

/* 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
}

int main(void) {
/* Init board hardware. */
BOARD_InitBootPins();
BOARD_InitBootClocks();
BOARD_InitBootPeripherals();
/* Init FSL debug console. */
BOARD_InitDebugConsole();

/* Define the init structure for the input pin */
gpio_pin_config_t sw_config = {
kGPIO_DigitalInput, 0,
};

#if (defined(FSL_FEATURE_PORT_HAS_NO_INTERRUPT) && FSL_FEATURE_PORT_HAS_NO_INTERRUPT)
GPIO_SetPinInterruptConfig(GPIOB, 5U, kGPIO_InterruptFallingEdge);
#else
PORT_SetPinInterruptConfig(PORTB, 5U, kPORT_InterruptFallingEdge);
#endif
EnableIRQ(PORTBCD_IRQHandler);
GPIO_PinInit(GPIOB, 5U, &sw_config);

while(1) {

       if (INT)
      {PRINTF (" Interruption");
       INT=0;}

}
return 0 ;

}

As you can see the code I am using is almost the same one as the example. I am kind of clueless of why it may be failing, so any kind of help will be appreciated.

Best Regards,

Pablo Cosgaya

Re: Use of GPIO Interruptions

mjbcswitzerland — Tue, 20 Aug 2019 23:22:08 GMT

Are you sure that you have enabled interrupts globally?

General guide to GPIO interrupts: https://www.youtube.com/watch?v=CubinvMuTwU&list=PLWKlVb_MqDQFZAulrUywU30v869JBYi9Q&index=18

Regards

Mark

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Re: Use of GPIO Interruptions

pablo_cosgaya — Wed, 21 Aug 2019 09:49:13 GMT

Hello,

I am not completely sure of what you mean, I've tried NVIC_GetEnableIRQ(PORTBCD_IRQn)) and it tells me interrupts are active, so it should be working but nevertheless the code never enters the interruption function. I have also tried enabling the interrupts on the main function just in case something was overwriting it but there was no response with that method either.

The GPIO port and pins are initialized using the BOARD_InitBootPins(); and BOARD_InitBootPeripherals(); functions which seem to be working properly, I have checked inside of those the details of the initialization of the GPIO port and they seem to be correct and the port has the clock gate enabled as well.

I don't really know what could be the problem, I will attach both the .mex I am using as well as the code just in case I am missing something obvious, which could honestly just be the case as I am quite new to microcontroller programming.

Best Regards,

Pablo

Re: Use of GPIO Interruptions

FelipeGarcia — Wed, 21 Aug 2019 17:42:13 GMT

Hello Pablo,

I checked your code and it seems that you are not enabling the pin mux functionality on pin_mux.c

You should set is as follows:

PORT_SetPinMux(PORTB, 5U, kPORT_MuxAsGpio);

I hope this helps.

Best regards,

Felipe

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Re: Use of GPIO Interruptions

mjbcswitzerland — Wed, 21 Aug 2019 19:17:19 GMT

Check that the Cortex core's global interrupt mask (PRIMASK) is not set. You will find an instruction like

asm("cpsie i")

which clears it from its masked state after reset.

Regards

Mark

Re: Use of GPIO Interruptions

pablo_cosgaya — Thu, 22 Aug 2019 07:04:13 GMT

Hello again,

I have added this function and it doesn't seem to be working either, the code neer enters the interruption is still not working yet. I have also tried using asm("cpsie i") and there has been no luck either. I have also tried using the DisableGlobalIRQ and EnableGlobalIRQ functions as well to check if gloal interrupts were off but that method has also failed.

Is there any kind of setup guide or aplication note that goes step by step that I can check?

Best Regards,

Pablo

Re: Use of GPIO Interruptions

FelipeGarcia — Mon, 26 Aug 2019 20:42:37 GMT

Hello Pablo,

Unfortunately, we do not have such an application note explaining that. What I recommend you is to base your project in gpio_input_interrupt example from SDK and change the interrupt pin for PTB5. Please make sure of the following:

-Initialize clock.

-Initialize corresponding pin.

-Configure interrupt.

-Initialize GPIO.

-Use the appropriate interrupt handler.

I hope this helps.

Best regards,

Felipe

Re: Use of GPIO Interruptions

pablo_cosgaya — Thu, 29 Aug 2019 06:33:18 GMT

Hello again,

I finally found the problem, turns out it was a HW problem instead of a SW one. I had pin 30 connected pulled down via a resistor on my PCB which caused the interruptions to never happen as it was the NMI pin which according to the reference manual should not have a LOW logic level if you need to use Interrupts. Thanks everyone for the help!

Regards,

Pablo