https://devzone.nordicsemi.com/f/nordic-q-a/7145/softdevice-with-spi-rx-byte-replaced-with-0x00I have a program running with SD 7.2 and SPI on my nrF51822 talking to a SPI slave device. I use GPIOTE triggered on an edge to set a chip select line and read bytes from the slave. I do not use Timer 0 or PPI for my SPI implementation. The methoden-USTelligent Community 13Wed, 20 May 2015 21:31:07 GMThttps://devzone.nordicsemi.com/thread/25256?ContentTypeID=1Wed, 20 May 2015 21:31:07 GMT137ad170-7792-4731-bb38-c0d22fbe4515:88fff287-bdec-4ab8-bec6-9c36fbd4abbfbrandon<p>I believe I identified my issue. I use GPIOTE to trigger a notification that I need to select an SPI slave but I am using a polling method to capture bytes over SPI instead of an interrupt driven method. Before I used SD the timer could run without problems. With SD, I may be able to get a couple messages alright, but the softdevice will eventually conflict and screw up my app if it takes control during a polled transfer.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/25255?ContentTypeID=1Wed, 20 May 2015 00:03:35 GMT137ad170-7792-4731-bb38-c0d22fbe4515:06f57b99-771c-49fb-97b1-480a046f7175RK<p>Post code. Buffer definition, code which does the assignment, comments showing where you check what to find it zero/non-zero.</p><div style="clear:both;"></div>