problem with using gpio pins and functions in nrf52840-PCA10056

[diya]

how to use the gpio pins functions in our program ? do we need a makefile and header file to read or write or use the gpio functions ?if so can you attach the makefile or header file required for gpio pins?

[Caner Celiktas]

You don't need make a header file. Nordic already did for you.

This works for me ;

1. Include "nrf_gpio.h"
2. init your gpio (decide your pin's direction input/output )
3. use nrf_gpio_pin_set or nrf_gpio_pin_clear for set or clear your pins.

or you can include "nrf_drv_gpiote.h" and you can use it's function it's similiar to "nrf_gpio.h"

there is an example in "SDK / examples/peripheral/pin_change_int" which can help you. Look over it.

[diya]

eventhogh after including #include "nrf_gpio.h" it is showing error
error: implicit declaration of function 'nrf_gpio_pin_set' [-Wimplicit-function-declaration]
     pinStatus = nrf_gpio_pin_set(8);
                 ^~~~~~~~~~~~~~~~
'-Wno-gnu-zero-variadic-macro-arguments' [-Werror]

how to resolve those issues ?

[Caner Celiktas]

Implict declaration means the compiler doesn't see the function's declaration. Which means likely you did something wrong when include header files. 

diya said:

pinStatus = nrf_gpio_pin_set(8);

nrf_gpio_pin_set is a void function so it can not return any value. You can't equate it to anything.