https://devzone.nordicsemi.com/f/nordic-q-a/16784/custom-board---can-t-use-more-than-4-buttonsWe did initial work on the NRF51DK (PCA_10028). We are using SDK 12 and ARM-GCC. We were able to compile and run successfully the experimental_ble_app_blinky and connect using your android App - nRF Blinky. We developed a custom board and were ableen-USTelligent Community 13Fri, 30 Sep 2016 16:33:00 GMThttps://devzone.nordicsemi.com/thread/64214?ContentTypeID=1Fri, 30 Sep 2016 16:33:00 GMT137ad170-7792-4731-bb38-c0d22fbe4515:c7e23d6e-667f-4b53-9040-e928d5cc4b08Bryan H<p>THANK YOU! I simply added the: &quot;#define GPIOTE_CONFIG_NUM_OF_LOW_POWER_EVENTS 6&quot; in my program and it works now. Thanks Again!</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/64213?ContentTypeID=1Fri, 30 Sep 2016 16:23:17 GMT137ad170-7792-4731-bb38-c0d22fbe4515:839be3d9-dafe-40f8-bbc5-e982887e2aa7Sigurd<p>With a custom board you will need to modify the board files. You can find the board files under:</p> <pre><code>\SDK_INSTALL_FOLDER\examples\bsp </code></pre> <p>When creating a new board file, simply copy the pca10028.h file, rename it, and modify it after your requirements. Then you have to modify boards.h to support your new file, and add a new define that you can specify in the makefile to include your modified file.</p> <p>A button press is a low power event, so you will also need to increase GPIOTE_CONFIG_NUM_OF_LOW_POWER_EVENTS which can be found in sdk_config.h.</p><div style="clear:both;"></div>