https://devzone.nordicsemi.com/f/nordic-q-a/7888/migrating-from-nrf51-dk-to-custom-moduleHi, I wan to load ble_app_hrs_s110_pca10028 project example from SDK 8.10 to a module purchased on eBay: www.ebay.com/.../111600483137 This module has nrf51822 qfaag2 (instead of nrf51422 on nrf 51 DK) and has no 32 khz crystal. I assumed Ien-USTelligent Community 13Fri, 23 Oct 2015 11:20:38 GMThttps://devzone.nordicsemi.com/thread/28182?ContentTypeID=1Fri, 23 Oct 2015 11:20:38 GMT137ad170-7792-4731-bb38-c0d22fbe4515:b1257774-6979-4678-a38d-57b8ca47c653Nguyen Hoan Hoang<p>Yes it does, that is why there is the calibration parameter. It allows to period periodically recalibrate the oscillator. The effect on performance is minimal.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/28181?ContentTypeID=1Thu, 22 Oct 2015 11:45:09 GMT137ad170-7792-4731-bb38-c0d22fbe4515:899cc84b-f216-4a1f-943e-ebeeac35ea3aRiZsho<p>I had the same problem and this resolved the issue. May I ask, for what purpose is this RC oscillator used? Will it affect performance and functionality when exposed to different temperatures?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/28180?ContentTypeID=1Mon, 29 Jun 2015 14:09:01 GMT137ad170-7792-4731-bb38-c0d22fbe4515:a62c05b7-5d66-4843-8ad7-6a9e32156434gaminn<p>Thanks, NRF_CLOCK_LFCLKSRC_RC_250_PPM_4000MS_CALIBRATION solved the problém. The device is QFAAG2 = 256 kB flash.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/28179?ContentTypeID=1Sun, 28 Jun 2015 15:50:06 GMT137ad170-7792-4731-bb38-c0d22fbe4515:896afef3-3156-495f-943d-dc662070af4dNguyen Hoan Hoang<p>You need to call <code>SOFTDEVICE_HANDLER_INIT</code> with <code>NRF_CLOCK_LFCLKSRC_RC_250_PPM_4000MS_CALIBRATION</code>. The other one is to use the crystal. I see on the photo that the device is marking QFAB which is the 128KB Flash version. So make sure you adjust the linker script to the right value.</p><div style="clear:both;"></div>