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
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 
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