https://devzone.nordicsemi.com/f/nordic-q-a/80788/cannot-read-max30003wing-board-using-spi-communicationHello, I tried to check SPI communication with a test board. However, I couldn&#39;t read the device info from the max30003wing board. Board: NRF52840DK --&gt; MAX30003WING Using SPI. SDK: nRF5_SDK_17.1.0_ddde560 this is my code I don&#39;t knowen-USTelligent Community 13Tue, 19 Oct 2021 07:14:12 GMThttps://devzone.nordicsemi.com/thread/334740?ContentTypeID=1Tue, 19 Oct 2021 07:14:12 GMT137ad170-7792-4731-bb38-c0d22fbe4515:e147526d-54fb-4363-abf9-308278e90736Kenneth<p>Do you have proper grounding between the boards?</p> <p>Kenneth</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/334704?ContentTypeID=1Tue, 19 Oct 2021 01:12:15 GMT137ad170-7792-4731-bb38-c0d22fbe4515:28561719-e0f0-4db8-b42b-7423ef96e605ray<p>thank you. We will review your suggestion.<br />additionally, Can&#39;t find a problem in the attached logic analyzer signal?</p> <p>I can&#39;t understand the part marked in red.&nbsp;Do you have any advice for me?</p> <p><img src="https://devzone.nordicsemi.com/resized-image/__size/640x480/__key/communityserver-discussions-components-files/4/pastedimage1634605783703v1.png" alt=" " /></p> <p>Regards,</p> <p>ray</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/334631?ContentTypeID=1Mon, 18 Oct 2021 13:15:12 GMT137ad170-7792-4731-bb38-c0d22fbe4515:3b3c2913-36cc-4206-9393-051c2e5151dbKenneth<p>Looking at your implementation of&nbsp;max30003ReadStatus() and trace, then it looks like the SPI is doing exactly as programmed. So, you need to look at whether the <span>MAX30003WING</span><span>&nbsp;is powered, configured for SPI, and that all SPI pins (including GND) are connected correctly between the boards.</span></p> <p><span>Kenneth</span></p><div style="clear:both;"></div>