Using pin 1 as GPIO breaks Bluetoothhttps://devzone.nordicsemi.com/f/nordic-q-a/65350/using-pin-1-as-gpio-breaks-bluetoothHi! I&#39;m using nrf52832 and SDK 16. I have a custom board that doesn&#39;t have an external oscillator for low frequency clock and uses internal RC so pins 0 and 1 can be used as GPIOs. I use the following settings in sdk_config: CLOCK_CONFIG_LF_SRC 0 CLOCK_CONFIG_LF_CAL_ENABLEDen-USTelligent Community 13Tue, 15 Sep 2020 14:49:37 GMTRE: Using pin 1 as GPIO breaks Bluetoothhttps://devzone.nordicsemi.com/thread/269713?ContentTypeID=1Tue, 15 Sep 2020 14:49:37 GMT137ad170-7792-4731-bb38-c0d22fbe4515:48534091-a8c5-4ae7-b750-42766cce01f9run_ar<p>Hi,</p> <p>I am sorry for the late answer. As far as I can see this should be sufficient to make the gpio function. But maybe there is an issue I&#39;m not aware off. Any chance you have firmware that can be used to recreate the behavior?</p><div style="clear:both;"></div>RE: Using pin 1 as GPIO breaks Bluetoothhttps://devzone.nordicsemi.com/thread/267288?ContentTypeID=1Mon, 31 Aug 2020 15:14:04 GMT137ad170-7792-4731-bb38-c0d22fbe4515:5f61eeb6-75e2-4a79-8ddf-9aafe6acc024SKR<p>I&#39;ve checked again. There are 3 LF_SRCs in the config. They are all set to 0.</p><div style="clear:both;"></div>RE: Using pin 1 as GPIO breaks Bluetoothhttps://devzone.nordicsemi.com/thread/267185?ContentTypeID=1Mon, 31 Aug 2020 11:07:19 GMT137ad170-7792-4731-bb38-c0d22fbe4515:03e9b443-7686-4d9a-a371-968ad460ce7erun_ar<p>Hi,</p> <p>Can you check that you have all &quot;lf_src&quot; defines set to 0? Seems you might be missing NRFX_CLOCK_CONFIG_LF_SRC.</p><div style="clear:both;"></div>