https://devzone.nordicsemi.com/f/nordic-q-a/11999/spi-with-softdeviceGood morning. I &#180;m working with nrf51-dk, sdk 9.0.0 and softdevice 110. I have done a proyect without softdevice, only uart and master spi (mode 0) and works perfect. Here code of the spi_init void spi_master_inicio(void){ spi_master_config_ten-USTelligent Community 13Mon, 22 Feb 2016 10:31:09 GMThttps://devzone.nordicsemi.com/thread/45421?ContentTypeID=1Mon, 22 Feb 2016 10:31:09 GMT137ad170-7792-4731-bb38-c0d22fbe4515:466a5ddf-175f-4781-9e6e-5722882ac57bJavier<p>Thank you very much, I was using an e.g the dk that has bsp, and it has defined all pins.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/45422?ContentTypeID=1Mon, 22 Feb 2016 10:02:12 GMT137ad170-7792-4731-bb38-c0d22fbe4515:1ea08730-1ce5-487a-8305-40a5ff69f3e9Einar Thorsrud<p>All GPIO&#39;s are available to the application even when the SoftDevice is used. Are you using custom HW or are you using e.g. the DK? Pin 17 and 20 are connected to buttons on the DK, though it should not matter as long as you do not press the button. However you should verify that you have not configured the buttons, possibly indirectly using the <a href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v11.0.0/lib_bsp.html">BSP library</a>.</p><div style="clear:both;"></div>