https://devzone.nordicsemi.com/f/nordic-q-a/18398/nrf8001-0x88-crc-mismatchBLE_Nordic.zip Hi, We are a couple of students trying to implement NRF8001 in our project, we made a SPI setup on our Atmega328p to communicate with the NRF. After sending our setup packages and 3 packages with 0s we get a response from the NRFen-USTelligent Community 13Mon, 19 Dec 2016 11:50:59 GMThttps://devzone.nordicsemi.com/thread/71022?ContentTypeID=1Mon, 19 Dec 2016 11:50:59 GMT137ad170-7792-4731-bb38-c0d22fbe4515:1ddd94cc-f706-4be3-ab5e-b96f3366b5ferun_ar<p>Thanks you for the update, glad to hear you figured it out.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/71021?ContentTypeID=1Fri, 16 Dec 2016 11:31:40 GMT137ad170-7792-4731-bb38-c0d22fbe4515:488f56c9-c874-4a48-afc0-70280425ef9dKristian Hansen<p>Hi, thank you for the quick response. We are at a very basic level in avr and c, when we tried to convert the arduino project to avr, we failed. Therefore we decided to try to create our own program to be able to understand SPI better. It looks like we did not send the last byte on some of the transmissions, after we fixed this the BLE responded with success! I attached our &quot;try&quot; at the conversion if you are interested.</p> <p>Regards, Kristian</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/71020?ContentTypeID=1Thu, 15 Dec 2016 14:47:40 GMT137ad170-7792-4731-bb38-c0d22fbe4515:14746bf9-1dbc-4bd3-9fae-f10e34f113dcrun_ar<p>Why don&#39;t you use <a href="https://github.com/NordicSemiconductor/ble-sdk-arduino">ble-sdk-arduino</a> for this? it would also be interesting to see the complete logic trace.</p><div style="clear:both;"></div>