https://devzone.nordicsemi.com/f/nordic-q-a/70300/nrf52805-layoutHi Attached is my pcb file. I select nrf52805_caaa, Can you help me check the pcb file? maybe the pcb is something wrong. I can download hex ,but can not debug it , when I debug ,will stop at &quot; while(nrf_drv_clock_hfclk_is_running() == false){;}&quot; .en-USTelligent Community 13Fri, 15 Jan 2021 13:41:34 GMThttps://devzone.nordicsemi.com/thread/289442?ContentTypeID=1Fri, 15 Jan 2021 13:41:34 GMT137ad170-7792-4731-bb38-c0d22fbe4515:b447debf-dea8-4e01-a110-03c7c702a5e7Kaja<p>Hi Ficher yu,<br /><br />could you upload the schematic and gerber files?&nbsp;<br /><br />If you want your design files to stay private, change the case to private.&nbsp;<br /><br />Best regards,<br />Kaja</p><div style="clear:both;"></div>