app_button_init undefined (SDK 12.2)

[paul_tanner]

I got this error when trying to use the button library to debounce noisy buttons. My application is a peripheral. When I looked in the library source I saw

#if NRF_MODULE_ENABLED(BUTTON).

As that is not defined anywhere the build doesn't compile the necessary code.

My question: what is this for and where should it be defined? (I tried commenting out the check but that causes the program to crash on reset.)

(Same problem with app_timer which is also needed for this.)

[Jørn]

Hello paul_tanner

If you look at the NRF_MODULE_ENABLED macro you will see it appends _ENABLED to whatever its argument is. In this case you get BUTTON_ENABLED, which is located in the sdk_config.h file. Try locating and setting the BUTTON_ENABLED define to 1 in sdk_config.h.

Best regards

Jørn Frøysa

[paul_tanner]

Thx @Jørn. I got caught with this one before. Will try this in sdk_config.h:

#ifndef BUTTON_ENABLED
#define BUTTON_ENABLED 1
#endif