nrf_gpio_read_pin doesn't seem to be working

[LuGr]

I am trying to read if an input is 0 or 1 but for some reason it takes the first one its offered and then it does not change anymore.

int main(void)
{
   nrf_gpio_cfg_output(24);
        	
   nrf_gpio_cfg_input(26, NRF_GPIO_PIN_NOPULL);	

   for(;;)
   {      
      if(nrf_gpio_pin_read(26) == 1)
      {
         nrf_gpio_pin_toggle(24);
      }
   }
}

I've also tried to read the input into a variable like this in a while/for loop:

int value = nrf_gpio_pin_read(26);

But for some reason it keeps sticking to either the first value I stored in it or the direction of the pull up/down. I'm a bit at a loss at what to try as the problem seems wierd. I have tried multiple DKs and pins to ensure it wasn't faulty hardware.

EDIT: What i want to be able to do is make something happen depending on if the input is high or low at the moment I read this. It is connected to a comparator that puts either a digital 1 or 0 value on the pin I am using as input.

EDIT: After I thought it worked last time with the code that uses a button and led on the DK I gave the comperator another go but it starts acting up again that it sets the nrf_gpio_pin_read only once in a while/for loop. When I use the code below in combination with an external comperator and I hook the comperator up to a PSU it waits for the condition while(nrf_gpio_pin_read(26) > 0) once afterwards even if I lower the voltage so this is no longer true the blinky light remains.

nrf_gpio_cfg_output(21);
nrf_gpio_cfg_input(26, NRF_GPIO_PIN_NOPULL);

int main(void)
{
	nrf_gpio_pin_write(21, 0);
	nrf_delay_ms(5000);
	
	for(;;)
	{
		while(nrf_gpio_pin_read(26) > 0)
		{
			nrf_gpio_pin_toggle(21);
			nrf_delay_ms(500);
		}
		nrf_gpio_pin_toggle(24);
	}
}

[Einar Thorsrud]

I'm a bit uncertain about your code. If you execute it like you show, nrf_gpio_pin_read() is only called once, and so it is no wander that it never changes. Or do you call it in a loop, just that you did not include the code for it? If you can post more of your code or a better explanation we will not have to make so many assumptions, and it will be easier to find a good answer.

[diya]

hii sir,

how to use the nrf_gpio_pin_read(pin_number) in our required application?can you tell what directory or headerfile or makefile is required for using the gpio functions

[Einar Thorsrud]

Hi,

You can refer to the API documentation. If you need more assistance, please create a new question as this thread is old.