https://devzone.nordicsemi.com/f/nordic-q-a/6896/simple-example-of-spi-s110-on-sdk-8-xHello, I wrote a firmware for my project, based on the UART over BLE example, so using the softdevice, establishing connections, etc. It works. I&#39;d now like to use a sensor connected via SPI. I have looked at the spi_master_with_spi_slave exampleen-USTelligent Community 13Fri, 29 May 2015 10:32:16 GMThttps://devzone.nordicsemi.com/thread/24307?ContentTypeID=1Fri, 29 May 2015 10:32:16 GMT137ad170-7792-4731-bb38-c0d22fbe4515:5c835986-251f-4934-97c7-c4a2c0f40670Susheel Nuguru<p>Have accepted RK&#39;s answer as you have not responded and his answer is convincing.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/24308?ContentTypeID=1Wed, 06 May 2015 02:56:14 GMT137ad170-7792-4731-bb38-c0d22fbe4515:b6104ce4-36fb-4ae1-8a47-17bf51bdb0a7RK<p>The SPI master works fine with the softdevice. I think all Nordic&#39;s library code works fine with the softdevice.</p> <p>while() loops don&#39;t block the softdevice, it runs on interrupts so your while loop just gets interrupted when it needs service and returns to it later, so it&#39;s not a problem. It may not be the most efficient way to do it, but it won&#39;t block.</p> <p>Don&#39;t forget to initialize the spi master with an available IRQ priority, you can&#39;t use 0 or 2, you need to use 1 or 3, there are defines for those, &quot;APP_IRQ_PRIORITY_HIGH&quot; and &quot;APP_IRQ_PRIORITY_LOW&quot;.</p><div style="clear:both;"></div>