https://devzone.nordicsemi.com/f/nordic-q-a/10640/app_button_init-no-longer-existsThe comment above app_button_init says, in part: * @note Normally initialization should be done using the APP_BUTTON_INIT() macro This macro is also mentioned in the documentation . However, I cannot find it anywhere in the code provided. Hasen-USTelligent Community 13Thu, 03 Dec 2015 20:00:11 GMThttps://devzone.nordicsemi.com/thread/39693?ContentTypeID=1Thu, 03 Dec 2015 20:00:11 GMT137ad170-7792-4731-bb38-c0d22fbe4515:c2418518-74c2-4c7d-adac-134bbe0a1eafNikolaus Wittenstein<p>The default config file has <code>#define GPIOTE_CONFIG_NUM_OF_LOW_POWER_EVENTS 1</code>, but I&#39;ve since realized that all of the example projects have <code>#define GPIOTE_CONFIG_NUM_OF_LOW_POWER_EVENTS 4</code> in their config files. I feel slightly dumb but at least it works!</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/39692?ContentTypeID=1Thu, 03 Dec 2015 16:01:57 GMT137ad170-7792-4731-bb38-c0d22fbe4515:34e0cd8c-aeeb-42fc-b0dc-132de71064e1Nikolaus Wittenstein<p>Looks like <code>app_button_init</code> calls the <code>GPIOTE_CONFIG_IN_SENSE_TOGGLE</code> macro and passes <code>false</code> as the argument, which sets the config to low-accuracy mode. In turn, <code>channel_port_alloc</code> only tries to allocate from an array with <code>GPIOTE_CONFIG_NUM_OF_LOW_POWER_EVENTS</code> elements, which is <code>#defined</code> as 1. In short, this means that I can only have one button? The board support package has multiple buttons, and I&#39;m not sure how they get away with it.</p><div style="clear:both;"></div>