Setting a GPIO pin as an analog inputhttps://devzone.nordicsemi.com/f/nordic-q-a/36616/setting-a-gpio-pin-as-an-analog-inputHi. I have the following code, I am attempting to read AIN0 on pin 4 (P0.02). I am watching the result whilst debugging the application on DK52, and it is a random value fluctuating at about 0x336c even when I GND pin 4, i.e. reading should be 0x0000en-USTelligent Community 13Mon, 12 Oct 2020 14:01:34 GMTRE: Setting a GPIO pin as an analog inputhttps://devzone.nordicsemi.com/thread/274366?ContentTypeID=1Mon, 12 Oct 2020 14:01:34 GMT137ad170-7792-4731-bb38-c0d22fbe4515:073b5d5d-0124-425e-bc24-b3f97f79fefaFelix<p>for others coming here: you should use SAADC_CH_CONFIG_BURST_Enabled on line 15 above and not&nbsp;SAADC_CH_PSELN_PSELN_AnalogInput0;&nbsp;&nbsp;</p><div style="clear:both;"></div>RE: Setting a GPIO pin as an analog inputhttps://devzone.nordicsemi.com/thread/140738?ContentTypeID=1Thu, 19 Jul 2018 18:36:37 GMT137ad170-7792-4731-bb38-c0d22fbe4515:5d2b5ca4-33a6-4938-acbe-d948ff84daa1Philip<p>Oh I just spotted the issue. On line 25 I have selected VDD as the +ve input to the ADC it should be;</p> <p>NRF_SAADC-&gt;CH[0].PSELP = SAADC_CH_PSELP_PSELP_AnalogInput0 &lt;&lt; SAADC_CH_PSELP_PSELP_Pos;</p> <p>Is working ok now. It is a bit different to a PIC ADC also, in that it is a differential ADC, so with the -ve set to GND, the output can go just below zero.</p><div style="clear:both;"></div>