Configure button without BSP_EVENT_HANDLER

[JK0201]

Hello to everyone.
I´m trying to configure the buttons of my SDK nRF52 to turn on LEDs, but all the examples I´ve found here are using BSP_EVENT_HANDLER.
So, my question is: that is the only way to correctly configure the buttons or I can configure them as a simply C++ code? I mean, directly, with only the button´s name.
I got this:

#include "nrf.h"
#include "nrf_gpio.h"

#define LED1 17
#define BTN1 13

int main (void)
{
   nrf_gpio_cfg_output(LED1);
   nrf_gpio_pin_clear(LED1);
   nrf_gpio_cfg_input(BTN1,NRF_GPIO_PIN_PULLDOWN);
   nrf_gpio_pin_clear(BTN1);

   while(1)
   {
       if(BTN1==true)
       {
          nrf_gpio_pin_toggle(LED1);
       }
   }

}

But it doesn´t work. I hope you can help me.

[AndreasF]

Hi.

It is possible, but you need a bit more code.

Here is how I did it:

#include <stdbool.h>
#include <stdint.h>

#include "nrf.h"
#include "nordic_common.h"
#include "boards.h"
#include "nrf_gpio.h"
#include "nrf_delay.h"

/**
 * @brief Function for application main entry.
 */
int main(void)
{
   bool button_pressed = false;

   nrf_gpio_cfg_output(LED_1);
   nrf_gpio_pin_clear(LED_1);

   nrf_gpio_cfg_input(BUTTON_1,NRF_GPIO_PIN_PULLUP);


    while (true)
    { 
        button_pressed = nrf_gpio_pin_read(BUTTON_1);

        if(button_pressed == false)
        {
          nrf_delay_us(1000000);
          nrf_gpio_pin_toggle(LED_1);
          // Do nothing.
        }
    }
}
/** @} */

You can't check if BTN1 is true, this is just a define, it will not change.

I used the function nrf_gpio_pin_read, to see if the button had been pressed.

/**
 * @brief Function for reading the input level of a GPIO pin.
 *
 * Note that the pin must have input connected for the value
 * returned from this function to be valid.
 *
 * @param pin_number Specifies the pin number to read.
 *
 * @return 0 if the pin input level is low. Positive value if the pin is high.
 */
__STATIC_INLINE uint32_t nrf_gpio_pin_read(uint32_t pin_number);

Best regards,

Andreas

[JK0201]

Thank you very much!
That´s exactly what I was seraching for.
I´ve only one question: why you use this line: " * @brief Function for application main entry. "?
What´s its function?