How to use the PORT event

[hbjin]

HI ,all ! I have a question about PORT event function.

as the 4 channels of GPIOTE (channel0 to channel3 ) have been used for other usage.

i need to use a general IO to detect the falling edge signal, the signal is a 50Hz square wave.

How should i do ~~

[hbjin]

Quax64, thank you very much for your reply

I use the function you suggested " nrf_gpio_cfg_sense_input ", but the GPIO PORT event function still can't work normally, The program code is as follows:

void ApplyIO_Init(){
nrf_gpio_cfg_sense_input(PIN_ZERO_INT, NRF_GPIO_PIN_PULLUP, NRF_GPIO_PIN_SENSE_LOW);
nrf_gpio_cfg_sense_input(PIN_SPEED,    NRF_GPIO_PIN_PULLUP, NRF_GPIO_PIN_SENSE_LOW);

NRF_GPIOTE->INTENSET = GPIOTE_INTENSET_PORT_Enabled << GPIOTE_INTENSET_PORT_Pos;

//---------------------------------------------------------------------------------
nrf_gpio_cfg_output(PIN_FAN);
nrf_gpio_cfg_output(PIN_ION);
nrf_gpio_cfg_output(PIN_BUZ);

nrf_gpio_cfg_output(PIN_NTC_EN);
nrf_gpio_cfg_output(PIN_LED1);
nrf_gpio_cfg_output(PIN_LED2);
nrf_gpio_cfg_output(PIN_LED3);

//---------------------------------------------------------------------------------
nrf_gpio_cfg_input(KEYB_D, NRF_GPIO_PIN_NOPULL);
nrf_gpio_cfg_input(PIN_NTC_AD, NRF_GPIO_PIN_NOPULL);

}

void GPIOTE_IRQHandler(void){
u32 pin;
if(NRF_GPIOTE->EVENTS_PORT){
	NRF_GPIOTE->EVENTS_PORT = 0;
	//---------------------------------
//	pin = nrf_gpio_pin_read(PIN_SPEED);
	PortISR();
}

}

However, when 50Hz square-wave signal to the actual IO (name is "SPEED") , GPIOTE PORT event is not trigger

Where is the problem?

[Stian Røed Hafskjold]

Did you enable the interrupt in main()?

NVIC_EnableIRQ(GPIOTE_IRQn);