https://devzone.nordicsemi.com/f/nordic-q-a/8521/connect-nrf51822-with-dwm1000Hi, I&#39;m trying to connect DWM1000 with SPI using spi_master.h. When I have written to registry e.g. 0x11, 0x12 and read it I&#39;ve got bytes: 0xFF, 0x11. If I read three bytes I&#39;ve got 0xFF, 0x11, 0x12. When I connect with DWM1000 on Raspberry usingen-USTelligent Community 13Thu, 27 Oct 2016 12:07:39 GMThttps://devzone.nordicsemi.com/thread/31127?ContentTypeID=1Thu, 27 Oct 2016 12:07:39 GMT137ad170-7792-4731-bb38-c0d22fbe4515:e0ff53c8-7f15-4f64-8400-d75a18e3a523LMf<p>Did you get enough speed in spi transmissions to comunicate with DWM1000? When you have to use Spi_high_rate in the decawave examples, you need 20 MHz and nRF5 max Spi speed is 4Mhz :/</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/31126?ContentTypeID=1Wed, 05 Aug 2015 11:58:02 GMT137ad170-7792-4731-bb38-c0d22fbe4515:85033ad1-0897-42f6-b389-e7f30c837f49Artur<p>Yes but I need 2 kind of function: read and write. In first I send header to control DWM and data In second I send only header and I&#39;m reading data from DWM</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/31125?ContentTypeID=1Wed, 05 Aug 2015 10:05:48 GMT137ad170-7792-4731-bb38-c0d22fbe4515:12bd9417-11a2-4fab-ad8e-f9ee9c22af82Susheel Nuguru<p>I did not read the data sheet for DWM1000, so i am mostly guessing here. Seems like you are writing twice using spi_master_send_recv? why are you doing that? you know that spi_master_send_recv can write and read at the same time</p><div style="clear:both;"></div>