https://devzone.nordicsemi.com/f/nordic-q-a/67378/two-spi-instances-running-at-the-same-timeHello, I have one SPI instance (instance 3, but have tried others) reading data from an ADC. It&#39;s reading data from an ADC triggered by a DRDY signal at 25khz. I setup a PPI chain where the DRDY interrupt will trigger the SS line to low, SPI transferen-USTelligent Community 13Tue, 20 Oct 2020 13:32:49 GMThttps://devzone.nordicsemi.com/thread/275952?ContentTypeID=1Tue, 20 Oct 2020 13:32:49 GMT137ad170-7792-4731-bb38-c0d22fbe4515:af5dd1d5-d19b-4fe2-b089-a647863469e9Edvin<p>Is it possible that the SPI is reading memory that the SAADC is not writing to? e.g if the SAADC buffers are shorter than the &quot;certain threshold&quot; for the counting timer?</p> <p>Have you tried to debug to check where the data is lost? I know you are using PPI, but it should still be possible to set a breakpoint in an event handler. Use this to check whether it is the SPI or ADC that originally contains the 0 values.</p> <p></p> <p>Best regards,</p> <p>Edvin</p><div style="clear:both;"></div>