https://devzone.nordicsemi.com/f/nordic-q-a/5125/nrf8001-init-problemI have met a problem in communicating with nrf8001. After reset nrf8001, RDYN is low which means it has something to send. Then I pull low of REQN and start receiving data via SPI bus. What I received are 0xC0, 0x10, 0xC0, 0x20,0x00,0x20,0x00,0x00en-USTelligent Community 13Tue, 13 Jan 2015 11:56:35 GMThttps://devzone.nordicsemi.com/thread/17993?ContentTypeID=1Tue, 13 Jan 2015 11:56:35 GMT137ad170-7792-4731-bb38-c0d22fbe4515:b1e5dd11-c8ee-414a-bcd4-9171de7c509cweil<p>Hi Star,</p> <p>Yes, the problem is the SPI clock. We set it to 16MHZ, but I just noticed that the highest freq nrf8001 supports is only 3MHZ. After I change it to 3MHZ, the problem goes away.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/17992?ContentTypeID=1Tue, 13 Jan 2015 10:48:13 GMT137ad170-7792-4731-bb38-c0d22fbe4515:52d4f207-7421-4f1e-86d8-932edf2b8b4fDavid Edwin<p>Your understanding is correct, i.e. after the reset of the nRF8001 you should get the ACI_EVT_DEVICE_STARTED. However I suspect that your SPI settings may not be correct so take a look at it again. Look at Section 7 of the nRF8001 data sheet to verify your settings. Additionally post a logic analyzer trace to see if the transaction is done correctly.</p><div style="clear:both;"></div>