How to configure the adc periheral in the Device Tree file *.dts

[Learner]

Hello,

I am trying to figure out a way to configure the adc node using the .dts Device Tree file in a similar way to what is done for other nodes such as &spi and &i2c.

Unfortunately, all the examples I have seen so far only set the status property for the adc node. I would like to add GPIO pin numbers, resolution, etc ...

Any suggestions?

&adc {
status = "okay";
};

&spi1 {
compatible = "nordic,nrf-spim";
status = "okay";
sck-pin = <13>;
mosi-pin = <09>;
miso-pin = <40>;
};

Thank you.

[Martin Lesund]

Hi learner,

In the NCS tutorial you can see how to add a ADC peripheral to your project.

For the .dts you could use "io-channels" as shown here.

Also here is a simple unofficial ADC sample that may be of help.

[Learner]

Hi Martin,

I give up. I tried few flavours of the overlay file and none worked. The project always fail to load.

# Method 1:
&adc {
# compatible = "nordic,nrf-saadc";
 compatible = "voltage-divider";

 adc5:adc@... {
 label = "AIN_5";
 }

 adc7:adc@... {
 label = "AIN_5";
 }

 n: node {
 io-channels = <&adc5 26>, <&adc7 28>;
 io-channel-names = "FOIL", "STRAP";
 };
};

# Method 2:
adc0: adc@4000E000 {
compatible = "nordic,nrf-saadc";
# compatible = "voltage-divider";
label = "ADC_0";
};

n: node {
io-channels = <&adc0 4>;
io-channel-names = "AIN_0";
};

Kind regards

Mohamed

[Martin Lesund]

Hi Mohamed,

I see you are getting support with regards to this in this case: https://devzone.nordicsemi.com/f/nordic-q-a/66702/build-zephyr-elf-versus-build-solution/275634#275634 
So lets us keep the discussion there.

[Learner]

That is fine.