https://devzone.nordicsemi.com/f/nordic-q-a/8008/problem-in-spi-communication-with-nrf24l01I write PWR_UP using SPI and then read the Reg &lt;0&gt;. but I am not getting what I wrote. Step 1 : Power ON using 3V. Step 2 : Delay for 1 Sec to get into POWER DOWN MODE. Step 3 : CSN low Step 4 : SPI (4 wire connected; 2Mbps) SPI Send commanden-USTelligent Community 13Sat, 04 Jul 2015 12:33:51 GMThttps://devzone.nordicsemi.com/thread/28684?ContentTypeID=1Sat, 04 Jul 2015 12:33:51 GMT137ad170-7792-4731-bb38-c0d22fbe4515:5ead298e-2a2e-4ce2-a1e1-e8aa4ed0deffruchit<p>I got it solved; my SPI configuration was different than required for nRF24L01+.</p> <p>SMP=1 CKE=1 CKP=0</p> <p>This setting for PIC18F is required. Any other setting may work while communicating between two controller ( where you can program both terminals ). but with nRF24L01+ stick to above settings.</p><div style="clear:both;"></div>