topic Re: Interrupt in kl46Z in Kinetis Design Studio

Interrupt in kl46Z

bheemarao — Fri, 21 Aug 2015 13:48:03 GMT

I am working on freedom KL46Z board using interrupt on KDS3.0 with KSDK1.2.0

switch SW1 on freedom board is connected to PTC-3 and SW2 is conected to PTC-12 port pin

i have enable interrupts for the SW1 and SW2 on processor expert

when i generate a code i can see Events.c as below

void PORTC_PORTD_IRQHandler(void)

{

PORT_HAL_ClearPortIntFlag(PORTC_BASE_PTR);

/* Write your code here ... */

}

how can i access individual interrupt from SW1 or SW2

i tried to identify interrupt from SW1 from function: GPIO_DRV_ReadPinInput(BUTTON_SW1)

but not able to identify the interrupt is from the source SW1 or SW2 ?

can any one has come across this scenario?

Re: Interrupt in kl46Z

EarlOrlando — Fri, 21 Aug 2015 20:04:42 GMT

Hello Bheema,

You need to call the function PORT_HAL_IsPinIntPending (the second parameter is the pin) before to clear the flag.

Example:

void PORTC_PORTD_IRQHandler(void)
{
   if(PORT_HAL_IsPinIntPending(PORTC_BASE_PTR, 3))
   {
      PORT_HAL_ClearPinIntFlag(PORTC_BASE_PTR, 3);
      /* Write your code here ... */
   }
}

Best regards,

Earl.

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Re: Interrupt in kl46Z

bheemarao — Mon, 24 Aug 2015 05:38:58 GMT

Yes it worked fine for me.

Thanks for sharing

Re: Interrupt in kl46Z

bheemarao — Mon, 24 Aug 2015 06:48:51 GMT

The mistake i was making is: i was clearing the interrupt flag using " GPIO_DRV_ClearPinIntFlag(BUTTON_SW2);" which was not working i believe, we have to clear flag using "PORT_HAL_ClearPortIntFlag(PORTC_BASE_PTR);"

if(GPIO_DRV_IsPinIntPending(BUTTON_SW2)!=1){

GPIO_DRV_TogglePinOutput(LED2_RED);

// GPIO_DRV_ClearPinIntFlag(BUTTON_SW2); //wrong way of clearing int flag

PORT_HAL_ClearPortIntFlag(PORTC_BASE_PTR); // correct way which is working fine

}

and instead of using the HAL " PORT_HAL_IsPinIntPending(PORTC_BASE_PTR, 3)" we can use "GPIO_DRV_IsPinIntPending(BUTTON_SW2)" which is user friendly.

Re: Interrupt in kl46Z

yusufyelkovan — Wed, 21 Dec 2016 12:58:00 GMT

Also we can control multiple pin interrupt requests for the same port. There is an example code below which written directly to relevant registers for frdm_kl46z.

void PORTC_PORTD_IRQHandler(void){

      switch((uint32_t)PORTC_ISFR)       // to determine pin number look into PORTC_ISFR register.
      {
            case ((uint32_t)1<<SW1) :          // if SW1 button pressed
                  PORTC_PCR(SW1) |= PORT_PCR_ISF_MASK;       // Clear interrupt service flag in port control register otherwise int. remains active
                  GPIOD_PTOR |= GPIO_PTOR_PTTO(GreenLedMask);    // toggle Green LED
                  break;
            case ((uint32_t)1<<SW3) :          // if SW3 button pressed
                  PORTC_PCR(SW3) |= PORT_PCR_ISF_MASK;       // Clear interrupt service flag in port control register otherwise int. remains active
                  GPIOD_PTOR |= GPIO_PTOR_PTTO(RedLedMask);       // toggle Red LED
                  break;
            default :
                  PORTC_ISFR |= (0xFFFFFFFF);     // clear all flags to prevent being stuck in repetitive interrupt.
GPIOD_PTOR |= GPIO_PTOR_PTTO(RedLedMask); // toggle Red LED
GPIOD_PTOR |= GPIO_PTOR_PTTO(GreenLedMask); // toggle Green LED
                  break;

}

and definitions like this :

#define RedLED    29     // PTE pin 29
#define GreenLED 5       // PTD pin 5
#define SW1          3       // PTC pin 3
#define SW3          12     // PTC pin 12
#define PORTC_D_IRQ_NBR (IRQn_Type)31 // IRQ number

const uint32_t GreenLedMask = (1<<GreenLED);
const uint32_t RedLedMask     = (1<<RedLED);
const uint32_t SW1Mask         = (1<<SW1);
const uint32_t SW3Mask         = (1<<SW3);