https://devzone.nordicsemi.com/f/nordic-q-a/20129/nrf52---need-library-function-equivalent-to-shiftin-and-bitwrite-in-arduino-pls-helphi I&#39;m porting Arduino code which has calls to ShiftIn() to read a byte from a GPIO Pin and bitWrite() to write a bit into a byte variable at a particular position. Below is example arduino code: data[2] = shiftIn(DOUT, PD_SCK, MSBFIRST); data[1en-USTelligent Community 13Fri, 03 Mar 2017 09:30:39 GMThttps://devzone.nordicsemi.com/thread/78366?ContentTypeID=1Fri, 03 Mar 2017 09:30:39 GMT137ad170-7792-4731-bb38-c0d22fbe4515:560c00a8-3e72-4319-a807-9b6a41d384f7J&#248;rgen Holmefjord<p>Hi,</p> <p><a href="https://www.arduino.cc/en/Reference/ShiftIn"><code>shiftIn()</code></a> seems like a software implementation of SPI. You can read about the SPI driver from our SDK <a href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v12.2.0/hardware_driver_spi_master.html?cp=4_0_1_2_14">here</a>. There is also an example <a href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v12.2.0/spi_master_example.html?cp=4_0_1_4_5_31">available here</a>. On the nRF51 and nRF52 series, you can select any of the GPIOs as pins for the SPI interfaces.</p> <p>bitWrite is just basic <a href="http://stackoverflow.com/a/47990">bit manipulation</a>. You can make this into a function if you use it frequently (you should extend it for other types and add some error checking):</p> <pre><code>uint8_t bitWrite(uint8_t x, uint8_t n, uint8_t b) { return (b ? (x | 1 &lt;&lt; n) : (x &amp; ~(1 &lt;&lt; n))); } </code></pre> <p>Best regards,</p> <p>Jørgen</p><div style="clear:both;"></div>