https://devzone.nordicsemi.com/f/nordic-q-a/2576/spi-using-pca10001-issuesHi I used the example from nrf51822_v4.4.1.31827\Board\nrf6310\spi_master_example for my PCA10001 board, as I know the pins configured in this example are for nrf6310 board I modified the section as follows for the PCA10001 board in spi_master_configen-USTelligent Community 13Thu, 22 May 2014 08:46:33 GMThttps://devzone.nordicsemi.com/thread/10221?ContentTypeID=1Thu, 22 May 2014 08:46:33 GMT137ad170-7792-4731-bb38-c0d22fbe4515:8d7a4410-55b5-4671-a62d-e168f77e2388Stefan Birnir Sverrisson<p>Hi</p> <p>I think you are misunderstanding table 1 in nRF51822 PS v1.3. Pin 42 in the table refers to the physical mapping of the pins in figure 2. When you want to configure pin P0.22 to be the SPI clock, then you should simply write:</p> <p>#define SPI_PSELSCK0 22 /**&lt; Pin P0.22 for clock */</p> <p>Do the same for the other SPI pins and it should work</p><div style="clear:both;"></div>