https://devzone.nordicsemi.com/f/nordic-q-a/2345/spi-pin-numberPlease help me ! (spi_maseter_config.h at line 29) #define SPI_PSELMOSI0 20u /**&lt; SPI Master Out Slave In GPIO pin number. */ nRF51822 QFAA Package pin no.20 = P0.14 but SDK document write (Used SPI master pin configurations) .. MOSI0 (Pin 20en-USTelligent Community 13Sat, 26 Apr 2014 00:21:27 GMThttps://devzone.nordicsemi.com/thread/9643?ContentTypeID=1Sat, 26 Apr 2014 00:21:27 GMT137ad170-7792-4731-bb38-c0d22fbe4515:d7d25287-1e8e-426d-98df-5ed9fbfa03ddTatsuya Anami<p>Hi</p> <p>Nice advice! Thanks! I understand pin layout and GPIO pin no.</p> <p>Package pin layout = P0.xx SDK document = P0.x .. P1.x .. P2.x</p> <p>It&#39;s very mistakable &gt;&lt;</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/9642?ContentTypeID=1Fri, 25 Apr 2014 11:35:24 GMT137ad170-7792-4731-bb38-c0d22fbe4515:1a18c750-ed1e-4f9a-986c-abefb19aaeaaH&#229;kon Alseth<p>Hi,</p> <p>It is GPIO P0.20, which is physically pin 28 on the QFN. Whenever you set a GPIO, it&#39;s mapped to P0.x, and its not related to the physical chip pin number.</p> <p>Best regards Håkon</p><div style="clear:both;"></div>