https://devzone.nordicsemi.com/f/nordic-q-a/33189/ble-crcinit-value-is-0x555555I am getting BLE working on an nRF52832, and I am a bit confused as to what I should be setting RADIO-&gt;CRCINIT to. I was hoping someone could clear this up, which is more about understanding BLE CRC calculation than the hardware itself. From what Ien-USTelligent Community 13Thu, 12 Apr 2018 13:06:51 GMThttps://devzone.nordicsemi.com/thread/128071?ContentTypeID=1Thu, 12 Apr 2018 13:06:51 GMT137ad170-7792-4731-bb38-c0d22fbe4515:fa286ca9-0b44-4f81-bc9a-0fb8371766beSigurd<p>Hi,</p> <p>I can confirm that setting&nbsp;<span>CRCINIT to&nbsp;0x555555 is correct when doing advertising. This is also what is done in <a href="https://github.com/zephyrproject-rtos/zephyr/blob/master/subsys/bluetooth/controller/ll_sw/ctrl.c#L5894">Zephyr</a>. Regarding preset value transformation, it could be that the CRC&nbsp;generator does this internally.</span></p><div style="clear:both;"></div>