Interrupt handler

[mosgaard2000]

Hi,

I use the nRF52840 DK with Segger IDE.

I would like to use different peripherals on the MCU (GPIO, SPI, Timers etc), but I would like to avoid using the Nordic SDK, because I find the documentation quite confusing and lacks descriptions.

I would like to just address the different registers directly - which is working ok. I can't however find any documentation on how to declare interrupts for different events. Does anybody knows how to declare a callback function that gets triggered every time a GPIO changes?

Hope someone can help.

[Marjeris Romero]

Hi,

It is much easier to use our drivers directly, the GPIO driver is documented here. We have an example which demonstrates interrupts on pin changes in our SDK, documented here. If you still want to address the registers directly you will need to look up the registers in the Product Specification, here.

Best Regards,

Marjeris

[mosgaard2000]

Hi,

Thank you for your reply.

I am looking for some info to actually setup the interrupts handler in the code. I have set all the registers to run the RTC and that seems to work ok, but I would then like to catch the interrupts on the TICK event, but I can't find any info about how to setup the interrupt handler in the code.

[Marjeris Romero]

Hi,

Take a look at the example under "examples\peripheral\rtc". You will need to declare a void function for "RTC0_IRQHandler", see the declarations of irq_handler and nrfx_rtc_0_irq_handler in nrfx_rtc.c, and the define in line 104 in nrfx_irqs_nrf52840.h

// TIMER0_IRQn
#define nrfx_timer_0_irq_handler    TIMER0_IRQHandler

#if NRFX_CHECK(NRFX_RTC0_ENABLED)
void nrfx_rtc_0_irq_handler(void)
{
    irq_handler(NRF_RTC0, NRFX_RTC0_INST_IDX, NRF_RTC_CC_CHANNEL_COUNT(0));
}
#endif

You can also take a look at this snippet here.