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boards: arduino: add ADC support for the Nano Matter #99210

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22 changes: 22 additions & 0 deletions boards/arduino/nano_matter/arduino_nano_matter-pinctrl.dtsi
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Original file line number Diff line number Diff line change
Expand Up @@ -36,6 +36,28 @@
};
};

iadc0_default: iadc0_default {
group0 {
silabs,analog-bus = <ABUS_AEVEN0_IADC0>;
};

group1 {
silabs,analog-bus = <ABUS_AODD0_IADC0>;
};

group2 {
silabs,analog-bus = <ABUS_BEVEN0_IADC0>;
};

group3 {
silabs,analog-bus = <ABUS_BODD0_IADC0>;
};

group4 {
silabs,analog-bus = <ABUS_CDEVEN0_IADC0>;
};
};

i2c0_default: i2c0_default {
group0 {
pins = <I2C0_SCL_PA7>, <I2C0_SDA_PA6>;
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109 changes: 109 additions & 0 deletions boards/arduino/nano_matter/arduino_nano_matter.dts
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Original file line number Diff line number Diff line change
Expand Up @@ -8,6 +8,7 @@
/dts-v1/;
#include <silabs/xg24/mgm240sd22vna.dtsi>
#include <zephyr/dt-bindings/input/input-event-codes.h>
#include <dt-bindings/adc/silabs-adc.h>
#include <zephyr/dt-bindings/pwm/pwm.h>
#include "arduino_nano_matter-pinctrl.dtsi"
#include "arduino_nano_matter_connector.dtsi"
Expand Down Expand Up @@ -36,6 +37,7 @@
pwm-led2 = &blue_pwm_led;
sw0 = &button0;
watchdog0 = &wdog0;
adc0 = &adc0;
};

leds {
Expand Down Expand Up @@ -84,6 +86,17 @@
zephyr,code = <INPUT_KEY_0>;
};
};

zephyr,user {
io-channels = <&adc0 0>,
<&adc0 1>,
<&adc0 2>,
<&adc0 3>,
<&adc0 4>,
<&adc0 5>,
<&adc0 6>,
<&adc0 7>;
};
Comment on lines +90 to +99
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@pillo79 pillo79 Nov 12, 2025

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I guess this is Arduino-specific. It should be moved to the variant overlay in arduino/ArduinoCore-zephyr#255 (or a separate PR).

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@silabs-bozont silabs-bozont Nov 12, 2025 •
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I've included it here so users can get an enumeration of io-channels even outside of the Arduino Core, because the hardware is the same. Also other Silabs boards include these like here. If you have a strong opinion against including this here, I'm open to debate :)

Edit: I don't think io-channels is Arduino specific - it has many occurrences in this repo too.

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@pillo79 pillo79 Nov 12, 2025

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Oh, I thought having board-defined zephyr,user was verboten in Zephyr. Nevermind then! 🙂

};

&timer0 {
Expand Down Expand Up @@ -203,6 +216,102 @@
status = "okay";
};

&adc0 {
pinctrl-0 = <&iadc0_default>;
pinctrl-names = "default";
#address-cells = <1>;
#size-cells = <0>;
status = "okay";

// A0 - PB0
channel@0 {
reg = <0>;
zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;
zephyr,gain = "ADC_GAIN_1";
zephyr,input-positive = <IADC_INPUT_PB0>;
zephyr,reference = "ADC_REF_VDD_1";
zephyr,resolution = <12>;
zephyr,vref-mv = <3300>;
};

// A1 - PB2
channel@1 {
reg = <1>;
zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;
zephyr,gain = "ADC_GAIN_1";
zephyr,input-positive = <IADC_INPUT_PB2>;
zephyr,reference = "ADC_REF_VDD_1";
zephyr,resolution = <12>;
zephyr,vref-mv = <3300>;
};

// A2 - PB5
channel@2 {
reg = <2>;
zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;
zephyr,gain = "ADC_GAIN_1";
zephyr,input-positive = <IADC_INPUT_PB5>;
zephyr,reference = "ADC_REF_VDD_1";
zephyr,resolution = <12>;
zephyr,vref-mv = <3300>;
};

// A3 - PC0
channel@3 {
reg = <3>;
zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;
zephyr,gain = "ADC_GAIN_1";
zephyr,input-positive = <IADC_INPUT_PC0>;
zephyr,reference = "ADC_REF_VDD_1";
zephyr,resolution = <12>;
zephyr,vref-mv = <3300>;
};

// A4 - PA6
channel@4 {
reg = <4>;
zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;
zephyr,gain = "ADC_GAIN_1";
zephyr,input-positive = <IADC_INPUT_PA6>;
zephyr,reference = "ADC_REF_VDD_1";
zephyr,resolution = <12>;
zephyr,vref-mv = <3300>;
};

// A5 - PA7
channel@5 {
reg = <5>;
zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;
zephyr,gain = "ADC_GAIN_1";
zephyr,input-positive = <IADC_INPUT_PA7>;
zephyr,reference = "ADC_REF_VDD_1";
zephyr,resolution = <12>;
zephyr,vref-mv = <3300>;
};

// A6 - PB1
channel@6 {
reg = <6>;
zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;
zephyr,gain = "ADC_GAIN_1";
zephyr,input-positive = <IADC_INPUT_PB1>;
zephyr,reference = "ADC_REF_VDD_1";
zephyr,resolution = <12>;
zephyr,vref-mv = <3300>;
};

// A7 - PB3
channel@7 {
reg = <7>;
zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;
zephyr,gain = "ADC_GAIN_1";
zephyr,input-positive = <IADC_INPUT_PB3>;
zephyr,reference = "ADC_REF_VDD_1";
zephyr,resolution = <12>;
zephyr,vref-mv = <3300>;
};
};

&flash0 {
partitions {
compatible = "fixed-partitions";
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