ADC

Question

hello 
 I try to make work the ADC on the NRF52840DK 
 I would like to use any of the 6 channels on the ARDUINO connector (p0.3, p0.4, p0.28-p0.31) 
 I am simply not able to make the code work. The only channel that works is channel 1. The project can be found here: 
 https://drive.switch.ch/index.php/s/NXyb6rleEa9Mcc2 
 It is an entire workspace. You may open the project through the workspace file. 
 Any help is apreciated. 
 /medard

usmanmehmood55 · Answer

If you are using NCS, you would have to use Zephyr's devicetree overlay to set the pin number. Here's one that I have tested myself / { zephyr,user { io-channels = <&adc 0>; }; }; Here, you can use < & adc 0 >; replacing 0 with whatever pin number you want. In your code file, you can use these defines #define ADC_CHANNEL DT_IO_CHANNELS_INPUT_BY_IDX(DT_PATH(zephyr_user), 0) #define ADC_NODE DT_PHANDLE(DT_PATH(zephyr_user), io_channels) #define ADC_NUM_CHANNELS DT_PROP_LEN(DT_PATH(zephyr_user), io_channels) You can use the ADC example provided in NCS for the rest, as I used the same code on my side. Hope this helps