Attaching pin to External Interrupt Control

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1

Dear Sodaq forums,

I have been trying to use the external interrupt controller to generate an event for a counter, but so far the EIC does not appear to work as intended. In the code below, Pin A7, or PA07, is supposedly configured as a pulldown input, and MUXed to EXTINT7 in the PORT registers, which should allow the EIC to use it as an external interrupt source. When pulsing 3.3V on the pin with a button nothing happens though, and the handler does not light up the LED. Is someone able to help successfully trigger the event?
Code: Runs on Sodaq One V3
void EICSetup(void)
{
PM->APBAMASK.reg |= (PM_APBAMASK_EIC); //enable EIC in clock power manager

// 2. Configure Pin A7 and assign to EXTINT0
PORT->Group[0].DIRCLR.reg = (1 << 7);
PORT->Group[0].PINCFG[7].reg= (PORT_PINCFG_INEN | PORT_PINCFG_PMUXEN |PORT_PINCFG_PULLEN ); //Input Enable, MUX on, Pull Resistor
PORT->Group[0].DIR.reg = 0; //Configure as Input
PORT->Group[0].OUT.reg = 0; //Configure as Pull_down
//Pin MUX forwarding is asynchronous and has no delay
PORT->Group[0].PMUX[3].bit.PMUXO = 0; //PinMux to EXTINT7
// Configure External Interrupt Controller
EIC->INTENSET.reg |= EIC_INTENSET_EXTINT7; //Enable EXTINT0 Interrupt, see if not doing so still triggers Event
EIC->CONFIG[0].reg |= EIC_CONFIG_SENSE7_RISE ; //Detect rising edge
EIC->EVCTRL.reg |= EIC_EVCTRL_EXTINTEO7; //Enable Event trigger for every detection

//attach clock to EIC
SYSCTRL->OSC32K.bit.ONDEMAND = 0;
SYSCTRL->OSC32K.bit.RUNSTDBY = 1;
SYSCTRL->OSC32K.bit.EN32K = 1;
SYSCTRL->OSC32K.bit.ENABLE = 1;
while((SYSCTRL->PCLKSR.bit.OSC32KRDY) == 0);

GCLK->GENDIV.reg = ( GCLK_GENDIV_DIV(32) | GCLK_GENDIV_ID(RTC_GCLK_ID));
GCLK->GENCTRL.reg = (GCLK_GENCTRL_GENEN | GCLK_GENCTRL_SRC_OSC32K | GCLK_GENCTRL_ID(RTC_GCLK_ID));
while (GCLK->STATUS.reg & GCLK_STATUS_SYNCBUSY);

GCLK->CLKCTRL.reg = ( GCLK_CLKCTRL_ID_EIC | GCLK_CLKCTRL_GEN(RTC_GCLK_ID) | GCLK_CLKCTRL_CLKEN);
while ( GCLK->STATUS.reg & GCLK_STATUS_SYNCBUSY );

NVIC_EnableIRQ(EIC_IRQn);
}

void EIC_Handler(void)
{ EIC->INTFLAG.bit.EXTINT7 = 1; // if flag high and IRQ handler is called, write a 1 to remove flag setLedColor(WHITE); //indicate external interrupt has occurred }

Any tips would be greatly appreciated. The pin does not have to be A7, but any GPIO pin not used for I2C communication would be fine.
Sincerely
Daniel

2

Nevermind. After extensive digging in the manuals, not only does the event generator work but so does the counter which is supposed to keep track of the pulses. Problem solved

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