https://devzone.nordicsemi.com/f/nordic-q-a/9019/spi-couldn-t-read-after-update-sdk-9-0Hi. All. I am in the process of update SDK 9.0 from 5.2. Meanwhile, SPI couldn&#39;t read from external flash&#39;s data. Unusually SPI works well before infinite loop, I tested several times read and write before infinite loop, but it couldn&#39;t read on interrupten-USTelligent Community 13Thu, 03 Sep 2015 06:02:15 GMThttps://devzone.nordicsemi.com/thread/33229?ContentTypeID=1Thu, 03 Sep 2015 06:02:15 GMT137ad170-7792-4731-bb38-c0d22fbe4515:6edfcbe2-ce50-427e-ba74-ff88fe8580e7jongkyu.yi<p>Thank you for your reply. And sorry to I didn&#39;t show any codes.</p> <p>And I tested the your suggestion, I tried start on SPI example. But it still didn&#39;t work. Same phenomenon. All of signals are occurred correctly, but variable p_rx_buf is always &#39;0&#39;.</p> <p>How can I solve this problem?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/33228?ContentTypeID=1Wed, 02 Sep 2015 14:59:52 GMT137ad170-7792-4731-bb38-c0d22fbe4515:7057cfde-1163-4ef8-9dc4-9509777c3913Stian R&#248;ed Hafskjold<p>It&#39;s not easy to know what is wrong without seeing any code. Did you try to start with the SPI example in SDK9, and see if that is working. Then you can try to work your way back to your code, and see where it went wrong.</p><div style="clear:both;"></div>