nRF8001 sends ACI packets but can&#39;t receive themhttps://devzone.nordicsemi.com/f/nordic-q-a/3021/nrf8001-sends-aci-packets-but-can-t-receive-themI&#39;ve used the nRF8001 on several projects with good success, so I&#39;m generally familiar with the chip&#39;s operation. But I&#39;m seeing an issue on a new (custom) board that I&#39;m not sure how to interpret. I wonder if anyone else has seen something similar. en-USTelligent Community 13Fri, 11 Jul 2014 23:19:08 GMTRE: nRF8001 sends ACI packets but can't receive themhttps://devzone.nordicsemi.com/thread/11375?ContentTypeID=1Fri, 11 Jul 2014 23:19:08 GMT137ad170-7792-4731-bb38-c0d22fbe4515:11799bf1-f86c-4392-988a-7604da950a54Garth Snyder<p>Thanks for the response, Star Destroyer.</p> <p>I believe I have traced this phenomenon to a glitch listed in the errata for the MCU that can affect SPI communication in certain circumstances. So it probably really is the case that the nRF8001 isn&#39;t receiving anything on its MOSI pin.</p> <p>Nevermind! :-)</p><div style="clear:both;"></div>RE: nRF8001 sends ACI packets but can't receive themhttps://devzone.nordicsemi.com/thread/11374?ContentTypeID=1Fri, 11 Jul 2014 22:38:33 GMT137ad170-7792-4731-bb38-c0d22fbe4515:a9428b4c-2fa3-42d2-b677-3cf0ef78d491David Edwin<p>Are you sharing the 16MHz crystal between the mcu and the nRF8001 ? If so you will need to adjust the loading capacitors so the longer line length for XC1 is adjusted for. If you do not get the 16MHz clock in properly the nRF8001 will not startup. The 16MHz seems to be the likely issue.</p><div style="clear:both;"></div>