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,
Yes, that should be correct.
p0.04 of the nRF5340, so AIN1

https://infocenter.nordicsemi.com/index.jsp?topic=%2Fug_nrf5340_pdk%2FUG%2Fnrf5340_PDK%2Fhw_analog_pins.html 

[Learner]

Hi Martin,

According to the PCA10095 schematics of the nRF5340 PDK  (nRF5340-QKAA) pin 4 on P0.04 is AIN0 not AIN1.

Could you please double check. Thank you.

Kind regards

Mohamed

[Martin Lesund]

Hi Mohamed,
You are correct, there seems to be some difference in the User guide and the Schematic.

I will check this internally so it will be corrected.

Since the only inconsistency is the user guide, The correct Pin naming is the the schematic and the product spec. which states: P0.04 is AIN0

[Learner]

Thank you.

Please let me know which one is correct.

Kind regards

[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