How to use GPIO 09, GPIO 10 nrf52840 as GPIO interrupt

[John Nguyen]

Dear support team,

I would like to use GPIO 09/10 as a GPIO interrupt.

I just searched and I see that need to define CONFIG_NFCT_PINS_AS_GPIOS.

But I can't do it. Please help!

P/s: I use nrf52840 with segger embedded.

Thanks and regards,

John N

[Andre]

Why can't you define CONFIG_NFCT_PINS_AS_GPIOS?

Nevertheless, if for some reason you cannot define CONFIG_NFCT_PINS_AS_GPIOS you can run the code it would trigger by yourself

	// Making sure the NFC pins are set as GPIO
	if ((NRF_UICR->NFCPINS & UICR_NFCPINS_PROTECT_Msk)
			== (UICR_NFCPINS_PROTECT_NFC << UICR_NFCPINS_PROTECT_Pos)) {
		NRF_NVMC->CONFIG = NVMC_CONFIG_WEN_Wen << NVMC_CONFIG_WEN_Pos;
		while (NRF_NVMC->READY == NVMC_READY_READY_Busy) {
		}
		NRF_UICR->NFCPINS &= ~UICR_NFCPINS_PROTECT_Msk;
		while (NRF_NVMC->READY == NVMC_READY_READY_Busy) {
		}
		NRF_NVMC->CONFIG = NVMC_CONFIG_WEN_Ren << NVMC_CONFIG_WEN_Pos;
		while (NRF_NVMC->READY == NVMC_READY_READY_Busy) {
		}
		NVIC_SystemReset();
	}

[John Nguyen]

I mean when I defined CONFIG_NFCT_PINS_AS_GPIOS, my code still doesn't work.

Can I put this code in main.c, before init gpio, right?

Thanks,

John N

[Marte Myrvold]

Hi John,

How have you defined CONFIG_NFCT_PINS_AS_GPIOS?

You should add this to the preprocessor definitions in SEGGER Embedded Studio. You can do so by doing the following: Go to Project > Edit Options > Code > Preprocessor > Preprocessor Definitions and add CONFIG_NFCT_PINS_AS_GPIOS there.

Best regards,

Marte

[John Nguyen]

Hi,

my application is config GPIO 10 as GPIO interrupt. I already defined CONFIG_NFCT_PINS_AS_GPIOS in Preprocessor Definitions as you refer.
This is my code. Could you help me check it?

P/S; macro FLOW_SS_PIN_INPUT is defined as GPIO 10

static void in_pin_handler(nrf_drv_gpiote_pin_t pin, nrf_gpiote_polarity_t action)
{ 
    test_adc = true;
    flow_cnt ++;
    FLOW_DBG(TAG, "cnt = %d\r\n", flow_cnt);
}

void flow_sensor_init(void)
{
  ret_code_t err_code;
  
    if ((NRF_UICR->NFCPINS & UICR_NFCPINS_PROTECT_Msk)== (UICR_NFCPINS_PROTECT_NFC << UICR_NFCPINS_PROTECT_Pos))
    {
        NRF_NVMC->CONFIG = NVMC_CONFIG_WEN_Wen << NVMC_CONFIG_WEN_Pos;
        while (NRF_NVMC->READY == NVMC_READY_READY_Busy);
        NRF_UICR->NFCPINS &= ~UICR_NFCPINS_PROTECT_Msk;
        while (NRF_NVMC->READY == NVMC_READY_READY_Busy);
        NRF_NVMC->CONFIG = NVMC_CONFIG_WEN_Ren << NVMC_CONFIG_WEN_Pos;
        while (NRF_NVMC->READY == NVMC_READY_READY_Busy);
        NVIC_SystemReset();
    }

  //init gpioe
  err_code = nrf_drv_gpiote_init();
  APP_ERROR_CHECK(err_code);

  //init input
  nrf_drv_gpiote_in_config_t in_config = GPIOTE_CONFIG_IN_SENSE_HITOLO(true);
  in_config.pull = NRF_GPIO_PIN_PULLUP;

  err_code = nrf_drv_gpiote_in_init(FLOW_SS_PIN_INPUT, &in_config, in_pin_handler);
  APP_ERROR_CHECK(err_code);

  nrf_drv_gpiote_in_event_enable(FLOW_SS_PIN_INPUT, true);

}

[John Nguyen]

Hi,

Thanks for your support.

I already defined in Preprocessor Definitions.

Could you check the code that I posted above? Hope that You can find out issue.

Thanks