https://devzone.nordicsemi.com/f/nordic-q-a/34490/can-program-custom-nrf52832-board-but-not-runningi have a custom NRF52832 board. it have a 32mHz crystal but have not 32kHz crystal. i use keil Uvision for programming, compile and burn the chip. i use this example: nRF5_SDK_11.0.0_89a8197\examples\ble_peripheral\ble_app_beacon\pca10040\s132en-USTelligent Community 13Wed, 21 Apr 2021 16:21:14 GMThttps://devzone.nordicsemi.com/thread/306180?ContentTypeID=1Wed, 21 Apr 2021 16:21:14 GMT137ad170-7792-4731-bb38-c0d22fbe4515:17bae10c-3a8c-4508-a589-5d56ed00e443Einar Thorsrud<p>Hi,</p> <p>Based on what you write it seems likely that the LF oscillator is less accurate then configured, then. So you should both check your HW (if using 32.768 kHz xtal) and SW configuration, particularly ensure that&nbsp;NRF_SDH_CLOCK_LF_ACCURACY is set to 1 in sdk_config.h if using LFRC.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/306121?ContentTypeID=1Wed, 21 Apr 2021 12:48:24 GMT137ad170-7792-4731-bb38-c0d22fbe4515:6e36c377-4655-4d7f-972a-2a1ff426f9ddNisubaba<p>i have also face the same issue. but my ble advertise fine but can not send the data.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/132996?ContentTypeID=1Wed, 23 May 2018 12:24:46 GMT137ad170-7792-4731-bb38-c0d22fbe4515:5f948910-c3c9-40f6-ab19-a05e22b5f5d3Andreas<p>Hi,</p> <p>&nbsp;</p> <p>You should configure 250ppm or 500ppm accuracy at least.</p> <p>&nbsp;</p> <p>I still have some concerns about the 32 MHz crystal, is it correctly loaded? I can not see any load capacitors. Are you able to see any radio activity at all, e.g. by measuring current?</p> <p>&nbsp;</p> <p>Also, are you certain that you have loaded the Softdevice?</p> <p>&nbsp;</p> <p>Best regards,</p> <p>Andreas</p><div style="clear:both;"></div>