defunct: playing around with bootloaders

- Corrected device tree overlays to prevent MCUboot and app overlap
- MCUboot now at 0x8000000 (32KB), app at 0x8008000 (96KB)
- Successfully boots MCUboot which chains to application
- Shell and reset command working properly
- Black Magic Probe flashing confirmed working for both domains

software/.vscode/settings.json

@@ -8,5 +8,10 @@
 
 		// File Associations
 		"files.associations": {
+			"array": "c",
+			"string_view": "c",
+			"initializer_list": "c",
+			"span": "c",
+			"format": "c"
 		}
 }

software/apps/adc_dt/CMakeLists.txt

@@ -0,0 +1,8 @@
+# SPDX-License-Identifier: Apache-2.0
+
+cmake_minimum_required(VERSION 3.20.0)
+
+find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
+project(ADC)
+
+target_sources(app PRIVATE src/main.c)

software/apps/adc_dt/README.rst

@@ -0,0 +1,62 @@
+.. zephyr:code-sample:: adc_dt
+   :name: Analog-to-Digital Converter (ADC) with devicetree
+   :relevant-api: adc_interface
+
+   Read analog inputs from ADC channels.
+
+Overview
+********
+
+This sample demonstrates how to use the :ref:`ADC driver API <adc_api>`.
+
+Depending on the target board, it reads ADC samples from one or more channels
+and prints the readings on the console. If voltage of the used reference can
+be obtained, the raw readings are converted to millivolts.
+
+The pins of the ADC channels are board-specific. Please refer to the board
+or MCU datasheet for further details.
+
+Building and Running
+********************
+
+The ADC peripheral and pinmux is configured in the board's ``.dts`` file. Make
+sure that the ADC is enabled (``status = "okay";``).
+
+In addition to that, this sample requires an ADC channel specified in the
+``io-channels`` property of the ``zephyr,user`` node. This is usually done with
+a devicetree overlay. The example overlay in the ``boards`` subdirectory for
+the ``nucleo_l073rz`` board can be easily adjusted for other boards.
+
+Configuration of channels (settings like gain, reference, or acquisition time)
+also needs to be specified in devicetree, in ADC controller child nodes. Also
+the ADC resolution and oversampling setting (if used) need to be specified
+there. See :zephyr_file:`boards/nrf52840dk_nrf52840.overlay
+<samples/drivers/adc/adc_dt/boards/nrf52840dk_nrf52840.overlay>` for an example of
+such setup.
+
+Building and Running for ST Nucleo L073RZ
+=========================================
+
+The sample can be built and executed for the
+:zephyr:board:`nucleo_l073rz` as follows:
+
+.. zephyr-app-commands::
+   :zephyr-app: samples/drivers/adc/adc_dt
+   :board: nucleo_l073rz
+   :goals: build flash
+   :compact:
+
+To build for another board, change "nucleo_l073rz" above to that board's name
+and provide a corresponding devicetree overlay.
+
+Sample output
+=============
+
+You should get a similar output as below, repeated every second:
+
+.. code-block:: console
+
+   ADC reading:
+   - ADC_0, channel 7: 36 = 65mV
+
+.. note:: If the ADC is not supported, the output will be an error message.

software/apps/adc_dt/boards/weact_stm32g431_core.overlay

@@ -0,0 +1,38 @@
+/ {
+	vdd_sense: voltage-divider {
+		compatible = "voltage-divider";
+		/*
+		 * This reference must provide one argument (the channel number)
+		 * because of the "#io-channel-cells = <1>" in the &adc1 node.
+		 */
+		io-channels = <&adc1 1>;
+		output-ohms = <2200>;
+		full-ohms = <3200>;
+	};
+};
+
+&adc1 {
+	status = "okay";
+
+	pinctrl-0 = <&adc1_in1_pa0>;
+	pinctrl-names = "default";
+
+	st,adc-clock-source = "SYNC";
+	st,adc-prescaler = <4>;
+
+	#address-cells = <1>;
+	#size-cells = <0>;
+	/*
+	 * This line is required by the st,stm32-adc driver binding.
+	 * It declares that references to its channels need one extra argument.
+	 */
+	#io-channel-cells = <1>;
+
+	adc_channel_1: channel@1 {
+		reg = <1>;
+		zephyr,gain = "ADC_GAIN_1";
+		zephyr,reference = "ADC_REF_INTERNAL";
+		zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;
+		zephyr,resolution = <12>;
+	};
+};

software/apps/adc_dt/prj.conf

@@ -0,0 +1,4 @@
+CONFIG_ADC=y
+CONFIG_SENSOR=y
+CONFIG_VOLTAGE_DIVIDER=y
+CONFIG_LOG=y

software/apps/adc_dt/sample.yaml

@@ -0,0 +1,53 @@
+sample:
+  name: ADC devicetree driver sample
+tests:
+  sample.drivers.adc.adc_dt:
+    tags:
+      - adc
+    depends_on: adc
+    platform_allow:
+      - nucleo_l073rz
+      - disco_l475_iot1
+      - cc3220sf_launchxl
+      - cc3235sf_launchxl
+      - cy8cproto_063_ble
+      - stm32l496g_disco
+      - stm32h735g_disco
+      - nrf51dk/nrf51822
+      - nrf52840dk/nrf52840
+      - nrf54l15dk/nrf54l15/cpuapp
+      - nrf54h20dk/nrf54h20/cpuapp
+      - ophelia4ev/nrf54l15/cpuapp
+      - mec172xevb_assy6906
+      - gd32f350r_eval
+      - gd32f450i_eval
+      - gd32vf103v_eval
+      - gd32f403z_eval
+      - esp32_devkitc/esp32/procpu
+      - esp32s2_saola
+      - esp32c3_devkitm
+      - gd32l233r_eval
+      - lpcxpresso55s36
+      - mr_canhubk3
+      - longan_nano
+      - longan_nano/gd32vf103/lite
+      - rd_rw612_bga
+      - frdm_mcxn947/mcxn947/cpu0
+      - mcx_n9xx_evk/mcxn947/cpu0
+      - frdm_mcxc242
+      - ucans32k1sic
+      - xg24_rb4187c
+      - xg29_rb4412a
+      - raytac_an54l15q_db/nrf54l15/cpuapp
+      - frdm_mcxa166
+      - frdm_mcxa276
+    integration_platforms:
+      - nucleo_l073rz
+      - nrf52840dk/nrf52840
+    harness: console
+    timeout: 10
+    harness_config:
+      type: multi_line
+      regex:
+        - "ADC reading\\[\\d+\\]:"
+        - "- .+, channel \\d+: -?\\d+"

software/apps/adc_dt/socs/esp32_procpu.overlay

@@ -0,0 +1,25 @@
+/*
+ * Copyright (c) 2022 Wolter HV <wolterhv@gmx.de>
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/ {
+	zephyr,user {
+		io-channels = <&adc0 0>;
+	};
+};
+
+&adc0 {
+	status = "okay";
+	#address-cells = <1>;
+	#size-cells = <0>;
+
+	channel@0 {
+		reg = <0>;
+		zephyr,gain = "ADC_GAIN_1_4";
+		zephyr,reference = "ADC_REF_INTERNAL";
+		zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;
+		zephyr,resolution = <12>;
+	};
+};

software/apps/adc_dt/socs/esp32c3.overlay

@@ -0,0 +1,25 @@
+/*
+ * Copyright (c) 2022 Wolter HV <wolterhv@gmx.de>
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/ {
+	zephyr,user {
+		io-channels = <&adc0 0>;
+	};
+};
+
+&adc0 {
+	status = "okay";
+	#address-cells = <1>;
+	#size-cells = <0>;
+
+	channel@0 {
+		reg = <0>;
+		zephyr,gain = "ADC_GAIN_1_4";
+		zephyr,reference = "ADC_REF_INTERNAL";
+		zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;
+		zephyr,resolution = <12>;
+	};
+};

software/apps/adc_dt/socs/esp32s2.overlay

@@ -0,0 +1,25 @@
+/*
+ * Copyright (c) 2022 Wolter HV <wolterhv@gmx.de>
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/ {
+	zephyr,user {
+		io-channels = <&adc0 0>;
+	};
+};
+
+&adc0 {
+	status = "okay";
+	#address-cells = <1>;
+	#size-cells = <0>;
+
+	channel@0 {
+		reg = <0>;
+		zephyr,gain = "ADC_GAIN_1_4";
+		zephyr,reference = "ADC_REF_INTERNAL";
+		zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;
+		zephyr,resolution = <12>;
+	};
+};

software/apps/adc_dt/socs/esp32s3_procpu.overlay

@@ -0,0 +1,25 @@
+/*
+ * Copyright (c) 2022 Wolter HV <wolterhv@gmx.de>
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/ {
+	zephyr,user {
+		io-channels = <&adc0 0>;
+	};
+};
+
+&adc0 {
+	status = "okay";
+	#address-cells = <1>;
+	#size-cells = <0>;
+
+	channel@0 {
+		reg = <0>;
+		zephyr,gain = "ADC_GAIN_1_4";
+		zephyr,reference = "ADC_REF_INTERNAL";
+		zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;
+		zephyr,resolution = <12>;
+	};
+};

software/apps/adc_dt/src/main.c

@@ -0,0 +1,45 @@
+#include <zephyr/kernel.h>
+#include <zephyr/device.h>
+#include <zephyr/devicetree.h>
+#include <zephyr/drivers/sensor.h>
+#include <zephyr/logging/log.h>
+
+LOG_MODULE_REGISTER(adc_dt_example, LOG_LEVEL_DBG);
+
+/* Get the voltage divider device */
+#define VOLTAGE_DIVIDER_NODE DT_NODELABEL(vdd_sense)
+
+int main(void)
+{
+	const struct device *vdd_dev = DEVICE_DT_GET(VOLTAGE_DIVIDER_NODE);
+	struct sensor_value val;
+	int err;
+
+	if (!device_is_ready(vdd_dev)) {
+		LOG_ERR("Voltage divider device not ready");
+		return 0;
+	}
+
+	LOG_INF("Voltage divider device ready!");
+
+	while (1) {
+		err = sensor_sample_fetch(vdd_dev);
+		if (err < 0) {
+			LOG_ERR("Could not fetch sample (%d)", err);
+			k_sleep(K_MSEC(1000));
+			continue;
+		}
+
+		err = sensor_channel_get(vdd_dev, SENSOR_CHAN_VOLTAGE, &val);
+		if (err < 0) {
+			LOG_ERR("Could not get channel (%d)", err);
+			k_sleep(K_MSEC(1000));
+			continue;
+		}
+
+		LOG_INF("Voltage reading: %d.%06d V", val.val1, val.val2);
+
+		k_sleep(K_MSEC(1000));
+	}
+	return 0;
+}

software/apps/adc_test/CMakeLists.txt

@@ -0,0 +1,6 @@
+cmake_minimum_required(VERSION 3.20)
+
+find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
+project(adc_test)
+
+target_sources(app PRIVATE src/main.c)

software/apps/adc_test/boards/weact_stm32g431_core.overlay

@@ -0,0 +1,8 @@
+&adc1 {
+    pinctrl-0 = <&adc1_in1_pa0>;
+    pinctrl-names = "default";
+    status = "okay";
+
+    st,adc-clock-source = "SYNC";
+    st,adc-prescaler = <4>;
+};

software/apps/adc_test/prj.conf

@@ -0,0 +1,3 @@
+CONFIG_ADC=y
+CONFIG_ADC_STM32=y
+CONFIG_LOG=y

software/apps/adc_test/src/main.c

@@ -0,0 +1,73 @@
+#include <zephyr/kernel.h>
+#include <zephyr/drivers/adc.h>
+#include <zephyr/device.h>
+#include <zephyr/sys/printk.h>
+
+// ADC-Knoten holen
+static const struct device *adc_dev = DEVICE_DT_GET(DT_NODELABEL(adc1));
+
+// Kanaldefinitionen
+#define MY_SIGNAL_CHANNEL   1  // PA0
+#define ADC_VREFINT_CHANNEL 18 // Intern
+
+// Puffer für ZWEI Messwerte
+static int16_t sample_buffer[2];
+
+void main(void)
+{
+    int err;
+    // Die VREFINT-Spannung in mV aus dem Datenblatt deines Controllers
+    #define VREFINT_MV 1212
+
+    printk("*** ADC Ratiometric Measurement (Single Sequence) ***\n");
+
+    if (!device_is_ready(adc_dev)) {
+        printk("ADC device not ready!\n");
+        return;
+    }
+
+    // --- Einmaliges Setup der beiden Kanäle ---
+    const struct adc_channel_cfg signal_channel_cfg = {
+        .gain             = ADC_GAIN_1,
+        .reference        = ADC_REF_INTERNAL,
+        .acquisition_time = ADC_ACQ_TIME_DEFAULT, // Kurz für niederohmige Quellen
+        .channel_id       = MY_SIGNAL_CHANNEL,
+    };
+    const struct adc_channel_cfg vrefint_channel_cfg = {
+        .gain             = ADC_GAIN_1,
+        .reference        = ADC_REF_INTERNAL,
+        .acquisition_time = ADC_ACQ_TIME_MAX, // Lang für VREFINT
+        .channel_id       = ADC_VREFINT_CHANNEL,
+    };
+
+    adc_channel_setup(adc_dev, &signal_channel_cfg);
+    adc_channel_setup(adc_dev, &vrefint_channel_cfg);
+
+    // --- EINE Sequenz, die BEIDE Kanäle enthält ---
+    const struct adc_sequence sequence = {
+        .channels    = BIT(MY_SIGNAL_CHANNEL) | BIT(ADC_VREFINT_CHANNEL),
+        .buffer      = sample_buffer,
+        .buffer_size = sizeof(sample_buffer),
+        .resolution  = 12,
+    };
+
+    while (1) {
+        err = adc_read(adc_dev, &sequence);
+        if (err != 0) {
+            printk("ADC read failed with code %d\n", err);
+        } else {
+            // Die Ergebnisse sind in der Reihenfolge der Kanalnummern im Puffer
+            // Kanal 1 (MY_SIGNAL_CHANNEL) kommt vor Kanal 18 (ADC_VREFINT_CHANNEL)
+            int16_t signal_raw = sample_buffer[0];
+            int16_t vrefint_raw = sample_buffer[1];
+
+            // Ratiometrische Berechnung
+            int32_t signal_mv = (int32_t)signal_raw * VREFINT_MV / vrefint_raw;
+
+            printk("Signal: raw=%4d  |  VREFINT: raw=%4d  |  Calculated Voltage: %d mV\n",
+                   signal_raw, vrefint_raw, signal_mv);
+        }
+
+        k_msleep(2000);
+    }
+}

software/apps/adc_test/src/main.c2

@@ -0,0 +1,80 @@
+#include <zephyr/kernel.h>
+#include <zephyr/drivers/adc.h>
+#include <zephyr/device.h>
+
+// Definiere die Kanäle
+#define ADC_VREFINT_CHANNEL 18 // Muss mit dem DTS übereinstimmen
+#define MY_SIGNAL_CHANNEL   1  // Muss mit dem pinctrl im DTS übereinstimmen
+
+// ADC Device
+static const struct device *adc_dev = DEVICE_DT_GET(DT_NODELABEL(adc1));
+
+// ADC Kanal Konfigurationen
+static const struct adc_channel_cfg vrefint_channel_cfg = {
+    .gain             = ADC_GAIN_1,
+    .reference        = ADC_REF_INTERNAL, // Bedeutet VDDA
+    .acquisition_time = ADC_ACQ_TIME_MAX,
+    .channel_id       = ADC_VREFINT_CHANNEL,
+    .differential     = 0,
+};
+
+static const struct adc_channel_cfg signal_channel_cfg = {
+    .gain             = ADC_GAIN_1,
+    .reference        = ADC_REF_INTERNAL, // Bedeutet VDDA
+    .acquisition_time = ADC_ACQ_TIME_MAX,
+    .channel_id       = MY_SIGNAL_CHANNEL,
+    .differential     = 0,
+};
+
+// Puffer für die Messwerte
+#define BUFFER_SIZE 1
+static int16_t sample_buffer[BUFFER_SIZE];
+
+// Sequenz für die Messungen
+struct adc_sequence sequence_vrefint = {
+    .channels    = BIT(ADC_VREFINT_CHANNEL),
+    .buffer      = sample_buffer,
+    .buffer_size = sizeof(sample_buffer),
+    .resolution  = 12, // STM32G4 hat 12-bit
+};
+
+struct adc_sequence sequence_signal = {
+    .channels    = BIT(MY_SIGNAL_CHANNEL),
+    .buffer      = sample_buffer,
+    .buffer_size = sizeof(sample_buffer),
+    .resolution  = 12,
+};
+
+
+void main(void) {
+    if (!device_is_ready(adc_dev)) {
+        printk("ADC device not found\n");
+        return;
+    }
+
+    // Kanäle konfigurieren
+    adc_channel_setup(adc_dev, &vrefint_channel_cfg);
+    adc_channel_setup(adc_dev, &signal_channel_cfg);
+
+    while (1) {
+        // 1. VREFINT messen zur Kalibrierung
+        adc_read(adc_dev, &sequence_vrefint);
+        int16_t vrefint_raw = sample_buffer[0];
+
+        // 2. Dein eigentliches Signal messen
+        adc_read(adc_dev, &sequence_signal);
+        int16_t signal_raw = sample_buffer[0];
+
+        // 3. Spannung berechnen
+        // VREFINT Wert für STM32G431 bei 3.0V Vdda ist typ. 1.212V (1212 mV)
+        // Überprüfe den genauen Wert im Datenblatt für deinen Controller!
+        #define VREFINT_MV 1212 
+        
+        int32_t signal_mv = (int32_t)signal_raw * VREFINT_MV / vrefint_raw;
+
+        printk("VREFINT raw: %d, Signal raw: %d, Calculated Voltage: %d mV\n", 
+               vrefint_raw, signal_raw, signal_mv);
+
+        k_msleep(1000);
+    }
+}

software/apps/adc_test/src/main.tabby

@@ -0,0 +1,38 @@
+#include <zephyr.h>
+#include <drivers/adc.h>
+
+#define PA0_PIN 0x04
+#define ADC_CHANNEL 0x03
+
+int main(void) {
+    int16_t adc_value = 0;
+
+    // Initialize the ADC
+    adc_config_t adc_config;
+    adc_config.mode = ADC_MODE_SINGLE_SHOT;
+    adc_config.channel = ADC_CHANNEL_PA0;
+    adc_config.sampling_rate = ADC_SAMP_RATE_1MS;
+
+    adc_config.data_rate = ADC_DATA_RATE_4MS;
+    adc_config.aux = ADC_AUX_ALL;
+
+    adc_config.atten = ADC_ATTEN_DB_11;
+    adc_config.ref = ADC_REF_INTERNAL;
+
+    adc_config.cal = ADC_CAL_ALL;
+
+    if (adc_config_data(&adc_config, &adc_context) < 0) {
+        zephyr_printf("Failed to configure ADC\n");
+        return -1;
+    }
+
+    // Read the analog input value
+    if (adc_read(&adc_context, &adc_value) < 0) {
+        zephyr_printf("Failed to read ADC value\n");
+        return -1;
+    }
+
+    zephyr_printf("ADC Value: %d\n", adc_value);
+
+    return 0;
+}

software/apps/firmware_node/CMakeLists.txt

@@ -0,0 +1,8 @@
+cmake_minimum_required(VERSION 3.20)
+
+find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
+
+project(firmware_node LANGUAGES C)
+zephyr_include_directories(../../include)
+add_subdirectory(../../lib lib)
+target_sources(app PRIVATE src/main.c)

software/apps/firmware_node/README.md

@@ -0,0 +1,34 @@
+# Firmware Node Application
+
+This Zephyr application provides firmware management capabilities for the irrigation system.
+
+**Tested on Zephyr 4.1.99**
+
+## Features
+
+### Step 1: Shell with Reset Command
+- Shell interface with custom "reset" command
+- Warm reboot functionality
+
+### Planned Features
+- MCUboot support with partition manager
+- Firmware version display
+- MCUmgr support for OTA updates
+
+## Building
+
+```bash
+west build -p auto -b weact_stm32g431_core apps/firmware_node -- -DBOARD_FLASH_RUNNER=blackmagicprobe
+```
+
+## Flashing
+
+```bash
+west flash
+```
+
+## Usage
+
+Connect to the device via serial console and use the shell:
+- `reset` - Reboot the system
+- `help` - Show available commands

software/apps/firmware_node/boards/flash_partitions_128kb.dtsi

@@ -0,0 +1,29 @@
+/*
+ * Flash partition layout for STM32G431 (128KB total flash)
+ * MCUboot + single application slot configuration
+ */
+
+&flash0 {
+        partitions {
+                compatible = "fixed-partitions";
+                #address-cells = <1>;
+                #size-cells = <1>;
+
+                boot_partition: partition@0 {
+                        label = "mcuboot";
+                        reg = <0x00000000 0x0000A000>; /* 40 KB for MCUboot */
+                        read-only;
+                };
+
+                slot0_partition: partition@A000 {
+                        label = "image-0";
+                        reg = <0x0000A000 0x00016000>; /* 88 KB for application */
+                };
+        };
+};
+
+/ {
+	chosen {
+		zephyr,code-partition = &slot0_partition;
+	};
+};

software/apps/firmware_node/boards/weact_stm32g431_core.conf

@@ -0,0 +1,2 @@
+# Board specific configuration for weact_stm32g431_core
+# This file can be used for board-specific overrides if needed

software/apps/firmware_node/boards/weact_stm32g431_core.overlay

@@ -0,0 +1,7 @@
+/*
+ * Copyright (c) 2021 Nordic Semiconductor ASA
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include "flash_partitions_128kb.dtsi"

software/apps/firmware_node/boards/weact_stm32g431_core_mcuboot.overlay

@@ -0,0 +1,18 @@
+&flash0 {
+	partitions {
+		compatible = "fixed-partitions";
+		#address-cells = <1>;
+		#size-cells = <1>;
+
+		boot_partition: partition@0 {
+			label = "mcuboot";
+			reg = <0x00000000 0x00008000>; /* 32 KB */
+			read-only;
+		};
+
+		slot0_partition: partition@8000 {
+			label = "image-0";
+			reg = <0x00008000 0x00018000>; /* 96 KB */
+		};
+	};
+};

software/apps/firmware_node/pm.yml

@@ -0,0 +1,25 @@
+# Partition manager configuration for firmware_node
+
+# Boot partition (MCUboot)
+mcuboot_primary:
+  address: 0x00000000
+  size: 0x8000
+  region: flash_primary
+
+# Application partition (primary slot)
+mcuboot_primary_app:
+  address: 0x00008000
+  size: 0x18000
+  region: flash_primary
+
+# Secondary slot for updates
+mcuboot_secondary:
+  address: 0x00020000
+  size: 0x18000
+  region: flash_primary
+
+# Settings partition
+settings_partition:
+  address: 0x00038000
+  size: 0x8000
+  region: flash_primary

software/apps/firmware_node/prj.conf

@@ -0,0 +1,21 @@
+# Enable Console and printk for logging
+CONFIG_CONSOLE=y
+CONFIG_LOG=y
+CONFIG_LOG_PROCESS_THREAD=y
+
+# Enable Shell
+CONFIG_SHELL=y
+CONFIG_REBOOT=y
+
+# Enable the reset command
+CONFIG_KERNEL_SHELL=y
+
+# Enable settings for persistent storage
+CONFIG_SETTINGS=y
+CONFIG_SETTINGS_NVS=y
+CONFIG_NVS=y
+
+# Enable Flash and Flash Map for image trailer manipulation
+CONFIG_FLASH=y
+CONFIG_FLASH_MAP=y
+CONFIG_FLASH_PAGE_LAYOUT=y

software/apps/firmware_node/src/main.c

@@ -0,0 +1,167 @@
+#include <zephyr/kernel.h>
+#include <zephyr/logging/log.h>
+#include <zephyr/shell/shell.h>
+#include <zephyr/sys/reboot.h>
+#include <zephyr/drivers/flash.h>
+#include <zephyr/storage/flash_map.h>
+#include <zephyr/devicetree.h>
+
+LOG_MODULE_REGISTER(firmware_node, LOG_LEVEL_INF);
+
+// Image header magic number (from MCUboot)
+#define IMAGE_MAGIC 0x96f3b83d
+#define IMAGE_HEADER_SIZE 32
+
+// Function to invalidate current image and trigger serial recovery
+static int invalidate_current_image(void)
+{
+    const struct flash_area *fa;
+    int rc;
+
+    // Get the flash area for the current image slot (slot0_partition)
+    rc = flash_area_open(FIXED_PARTITION_ID(slot0_partition), &fa);
+    if (rc != 0) {
+        LOG_ERR("Failed to open flash area: %d", rc);
+        return rc;
+    }
+
+    // Ensure the flash area is valid
+    if (fa->fa_id != FIXED_PARTITION_ID(slot0_partition)) {
+        LOG_ERR("Invalid flash area ID: %d", fa->fa_id);
+        flash_area_close(fa);
+        return -EINVAL;
+    }
+
+    // Get the flash device associated with this area
+    // This is necessary to perform erase operations
+
+    const struct device *flash_dev = flash_area_get_device(fa);
+    if (flash_dev == NULL) {
+        LOG_ERR("Failed to get flash device for area");
+        flash_area_close(fa);
+        return -ENODEV;
+    }
+
+    struct flash_pages_info page_info;
+    off_t last_block_offset;
+
+    // Find the last block of the flash area
+    rc = flash_get_page_info_by_offs(flash_dev, fa->fa_off + fa->fa_size - 1, &page_info);
+    if (rc != 0) {
+        LOG_ERR("Failed to get page info: %d", rc);
+        flash_area_close(fa);
+        return rc;
+    }
+
+    // Calculate the last block offset
+    rc = flash_get_page_info_by_offs(flash_dev, fa->fa_off + fa->fa_size - 1, &page_info);
+    if (rc != 0) {
+        LOG_ERR("Failed to get page info: %d", rc);
+        flash_area_close(fa);
+        return rc;
+    }
+    last_block_offset = page_info.start_offset;
+
+   // Convert absolute flash offset to relative offset within the flash area
+   off_t relative_offset = last_block_offset - fa->fa_off;
+   
+   // Erase the image trailer/metadata at the end of the partition
+   LOG_INF("Erasing image trailer at absolute offset: %ld, relative offset: %ld, size: %d bytes", 
+           last_block_offset, relative_offset, page_info.size);
+   rc = flash_area_erase(fa, relative_offset, page_info.size);
+   if (rc != 0) {
+       LOG_ERR("Failed to erase image trailer: %d", rc);
+  
+   } else {
+       LOG_INF("Image trailer erased successfully");
+   }
+   
+   flash_area_close(fa);
+   return rc;
+}
+// Custom reset command handler
+static int cmd_reset(const struct shell *shell, size_t argc, char **argv)
+{
+    ARG_UNUSED(argc);
+    ARG_UNUSED(argv);
+    
+    shell_print(shell, "Resetting system...");
+    k_msleep(100); // Give time for the message to be sent
+    sys_reboot(SYS_REBOOT_COLD);
+    
+    return 0;
+}
+
+// MCUboot serial recovery command handler
+static int cmd_recovery(const struct shell *shell, size_t argc, char **argv)
+{
+    ARG_UNUSED(argc);
+    ARG_UNUSED(argv);
+    
+    shell_print(shell, "Entering MCUboot serial recovery mode...");
+    shell_print(shell, "Corrupting current image magic to trigger recovery...");
+    
+    // Invalidate the current image by corrupting its header
+    int rc = invalidate_current_image();
+    if (rc != 0) {
+        shell_error(shell, "Failed to invalidate image: %d", rc);
+        return rc;
+    }
+    
+    shell_print(shell, "Image magic corrupted. System will reset and MCUboot will detect bad image.");
+    shell_print(shell, "MCUboot should show error and wait for recovery.");
+    k_msleep(100); // Give time for the message to be sent
+    
+    // Reset the system - MCUboot will detect invalid image and enter serial recovery
+    // log_process(true);
+    // sys_reboot(SYS_REBOOT_COLD);
+    
+    return 0;
+}
+
+// Command to show firmware info
+static int cmd_info(const struct shell *shell, size_t argc, char **argv)
+{
+    ARG_UNUSED(argc);
+    ARG_UNUSED(argv);
+    
+    const struct flash_area *fa;
+    int rc = flash_area_open(FIXED_PARTITION_ID(slot0_partition), &fa);
+    
+    if (rc != 0) {
+        shell_error(shell, "Failed to open flash area: %d", rc);
+        return rc;
+    }
+    
+    // Read the first few bytes to check the image header
+    uint32_t magic;
+    rc = flash_area_read(fa, 0, &magic, sizeof(magic));
+    if (rc == 0) {
+        shell_print(shell, "Image magic: 0x%08x", magic);
+        if (magic == IMAGE_MAGIC) {
+            shell_print(shell, "Image header is valid");
+            shell_print(shell, "Image starts at flash offset: 0x%lx", (unsigned long)fa->fa_off);
+            shell_print(shell, "Image partition size: %d bytes", fa->fa_size);
+        } else {
+            shell_print(shell, "Image header is INVALID (expected 0x%08x)", IMAGE_MAGIC);
+        }
+    } else {
+        shell_error(shell, "Failed to read image header: %d", rc);
+    }
+    
+    flash_area_close(fa);
+    return 0;
+}
+
+SHELL_CMD_REGISTER(reset, NULL, "Reset the system", cmd_reset);
+SHELL_CMD_REGISTER(recovery, NULL, "Enter MCUboot serial recovery mode", cmd_recovery);
+SHELL_CMD_REGISTER(info, NULL, "Show firmware info", cmd_info);
+
+int main(void)
+{
+    LOG_INF("Firmware Node starting up");
+    LOG_INF("Shell with reset command available");
+    LOG_INF("Serial recovery command available");
+
+    return 0;
+}

software/apps/firmware_node/sysbuild.cmake

@@ -0,0 +1,4 @@
+# Sysbuild configuration for firmware_node with MCUboot
+
+# Enable MCUboot as bootloader
+set(SB_CONFIG_BOOTLOADER_MCUBOOT TRUE)

software/apps/firmware_node/sysbuild.conf

@@ -0,0 +1,5 @@
+# Sysbuild configuration for firmware_node with MCUboot
+
+# Enable MCUboot as bootloader
+SB_CONFIG_BOOTLOADER_MCUBOOT=y
+SB_CONFIG_MCUBOOT_MODE_SINGLE_APP=y

software/apps/firmware_node/sysbuild/firmware_node.overlay

@@ -0,0 +1,13 @@
+/*
+ * Copyright (c) 2021 Nordic Semiconductor ASA
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include "../boards/flash_partitions_128kb.dtsi"
+
+/ {
+	chosen {
+		zephyr,code-partition = &slot0_partition;
+	};
+};

software/apps/firmware_node/sysbuild/mcuboot.conf

@@ -0,0 +1,31 @@
+# MCUboot configuration for firmware_node
+# Enable basic console and logging for debugging
+CONFIG_LOG=y
+CONFIG_BOOT_BANNER=y
+CONFIG_CONSOLE=y
+CONFIG_UART_CONSOLE=y
+CONFIG_PRINTK=y
+
+# Single slot configuration (no upgrades)
+CONFIG_SINGLE_APPLICATION_SLOT=y
+
+# Enable serial recovery mode (temporarily commented out for debugging)
+# CONFIG_MCUBOOT_SERIAL=y
+# CONFIG_BOOT_SERIAL_UART=y
+# CONFIG_BOOT_SERIAL_DETECT_PORT=y
+
+# Disable signature validation for testing to save space
+CONFIG_BOOT_SIGNATURE_TYPE_NONE=y
+
+# Size optimizations to fit in 40KB flash
+CONFIG_SIZE_OPTIMIZATIONS=y
+CONFIG_CBPRINTF_NANO=y
+CONFIG_MINIMAL_LIBC=y
+CONFIG_ASSERT=n
+
+# Disable debug features for size
+CONFIG_DEBUG_INFO=n
+CONFIG_DEBUG_OPTIMIZATIONS=n
+
+# Minimal heap for size optimization
+CONFIG_HEAP_MEM_POOL_SIZE=0

software/apps/firmware_node/sysbuild/mcuboot.overlay

@@ -0,0 +1,12 @@
+/*
+ * MCUboot device tree overlay for firmware_node
+ * Uses shared flash partition layout
+ */
+
+#include "../boards/flash_partitions_128kb.dtsi"
+
+/ {
+	chosen {
+		zephyr,code-partition = &boot_partition;
+	};
+};

software/apps/firmware_node/sysbuild/mcuboot/boards/weact_stm32g431_core.overlay

@@ -0,0 +1,33 @@
+/*
+ * MCUboot specific overlay for weact_stm32g431_core
+ * This overlay defines flash partitions for MCUboot
+ */
+
+&flash0 {
+	partitions {
+		compatible = "fixed-partitions";
+		#address-cells = <1>;
+		#size-cells = <1>;
+
+		boot_partition: partition@0 {
+			label = "mcuboot";
+			reg = <0x00000000 0x00008000>;
+		};
+		slot0_partition: partition@8000 {
+			label = "image-0";
+			reg = <0x00008000 0x0000E000>;
+		};
+		slot1_partition: partition@16000 {
+			label = "image-1";
+			reg = <0x00016000 0x0000E000>;
+		};
+		storage_partition: partition@24000 {
+			label = "storage";
+			reg = <0x00024000 0x00004000>;
+		};
+	};
+};
+
+&chosen {
+	zephyr,boot-partition = &boot_partition;
+};

software/apps/slave_node/boards/weact_stm32g431_core.overlay

@@ -23,22 +23,31 @@
     pinctrl-names = "default";
 };
 
-&adc1 { // ADC1 wird für PA0 verwendet
-    status = "okay"; // ADC1 aktivieren
-    pinctrl-0 = <&adc1_in1_pa0>; // Pinmux für PA0 als ADC1_IN1
+&adc1 {
+    status = "okay";
+    pinctrl-0 = <&adc1_in1_pa0 &adc1_in15_pb0>;
     pinctrl-names = "default";
     st,adc-clock-source = "SYNC";
-    st,adc-prescaler = <4>;
+    st,adc-prescaler = <1>;
     #address-cells = <1>;
     #size-cells = <0>;
 
-    // Definition des ADC-Kanals für MULTISENSE (PA0)
-    channel@1 { // ADC1_IN1 ist Kanal 1
-        reg = <1>; // Kanalnummer
+    channel@1 {
+        reg = <1>;
+        zephyr,gain = "ADC_GAIN_1";
+        zephyr,reference = "ADC_REF_INTERNAL";
+        zephyr,acquisition-time = <ADC_ACQ_TIME_MAX>;  // Use maximum acquisition time for stability
+        zephyr,resolution = <12>;
+        zephyr,vref-mv = <2048>;  // STM32G431 VREFBUF at 2.048V
+    };
+
+    channel@15 {
+        reg = <15>;
         zephyr,gain = "ADC_GAIN_1";
         zephyr,reference = "ADC_REF_INTERNAL";
         zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;
         zephyr,resolution = <12>;
+        zephyr,vref-mv = <2048>;  // STM32G431 VREFBUF at 2.048V
     };
 };
 
@@ -47,4 +56,9 @@
     adc1_in1_pa0: adc1_in1_pa0 {
         pinmux = <STM32_PINMUX('A', 0, ANALOG)>; // PA0 in den Analogmodus setzen
     };
+
+    // Pinmux für PB0 als ADC1_IN15 (Analogmodus) - for lab supply testing
+    adc1_in15_pb0: adc1_in15_pb0 {
+        pinmux = <STM32_PINMUX('B', 0, ANALOG)>; // PB0 in den Analogmodus setzen
+    };
 };

software/apps/slave_node/dts/bindings/vnd7050aj-valve-controller.yaml

@@ -26,10 +26,10 @@ properties:
 
   s0-gpios:
     type: phandle-array
-    description: GPIO for status/select 0 pin
+    description: GPIO for select 0 pin
     required: true
 
   s1-gpios:
     type: phandle-array
-    description: GPIO for status/select 1 pin
+    description: GPIO for select 1 pin
     required: true

software/apps/slave_node/prj.conf

@@ -21,3 +21,7 @@ CONFIG_MODBUS=y
 CONFIG_MODBUS_ROLE_SERVER=y
 CONFIG_MODBUS_BUFFER_SIZE=256
 
+# Enable ADC driver
+CONFIG_ADC=y
+CONFIG_ADC_STM32=y
+

software/apps/slave_node/src/main.c

@@ -23,6 +23,13 @@ int main(void)
 		return 0;
 	}
 	
+	// Test supply voltage reading periodically
+	while (1) {
+		uint16_t supply_voltage = valve_get_supply_voltage();
+		LOG_INF("Supply voltage: %u mV", supply_voltage);
+		k_msleep(5000);  // Read every 5 seconds
+	}
+	
 	LOG_INF("Irrigation System Slave Node started successfully");
 	return 0;
 }

software/apps/snippets/bootloader/CMakeLists.txt

@@ -0,0 +1,8 @@
+cmake_minimum_required(VERSION 3.20)
+
+find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
+
+project(bootloader LANGUAGES C)
+zephyr_include_directories(../../../include)
+add_subdirectory(../../../lib lib)
+target_sources(app PRIVATE src/main.c)

software/apps/snippets/bootloader/README.md

@@ -0,0 +1,34 @@
+# Firmware Node Application
+
+This Zephyr application provides firmware management capabilities for the irrigation system.
+
+**Tested on Zephyr 4.1.99**
+
+## Features
+
+### Step 1: Shell with Reset Command
+- Shell interface with custom "reset" command
+- Warm reboot functionality
+
+### Planned Features
+- MCUboot support with partition manager
+- Firmware version display
+- MCUmgr support for OTA updates
+
+## Building
+
+```bash
+west build -p auto -b weact_stm32g431_core apps/firmware_node -- -DBOARD_FLASH_RUNNER=blackmagicprobe
+```
+
+## Flashing
+
+```bash
+west flash
+```
+
+## Usage
+
+Connect to the device via serial console and use the shell:
+- `reset` - Reboot the system
+- `help` - Show available commands

software/apps/snippets/bootloader/VERSION

@@ -0,0 +1,5 @@
+VERSION_MAJOR = 0
+VERSION_MINOR = 0
+PATCHLEVEL = 1
+VERSION_TWEAK = 0
+EXTRAVERSION = testing

software/apps/snippets/bootloader/erase.sh

@@ -0,0 +1,8 @@
+#!/bin/bash
+/home/edi/zephyr-sdk-0.17.1/arm-zephyr-eabi/bin/arm-zephyr-eabi-gdb \
+	-ex 'target extended-remote /dev/ttyACM0' \
+	-ex 'monitor swdp_scan' \
+	-ex 'attach 1' \
+	-ex 'monitor erase_mass' \
+	-ex 'detach' \
+	-ex 'quit' \

software/apps/snippets/bootloader/prj.conf

@@ -0,0 +1,16 @@
+CONFIG_SHELL=y
+CONFIG_REBOOT=y
+
+# MCUboot support for recovery request function
+CONFIG_MCUBOOT_BOOTUTIL_LIB=y
+CONFIG_MCUBOOT_IMG_MANAGER=y
+CONFIG_IMG_MANAGER=y
+
+# Flash and Stream Configuration (required for IMG_MANAGER)
+CONFIG_FLASH=y
+CONFIG_STREAM_FLASH=y
+
+# Retention system
+CONFIG_RETENTION=y
+CONFIG_RETENTION_BOOT_MODE=y
+CONFIG_RETAINED_MEM=y

software/apps/snippets/bootloader/src/main.c

@@ -0,0 +1,42 @@
+#include <zephyr/kernel.h>
+#include <app_version.h>
+#include <zephyr/shell/shell.h>
+#include <zephyr/sys/reboot.h>
+#include <zephyr/dfu/mcuboot.h>
+#include <zephyr/retention/bootmode.h>
+#include <stdlib.h>
+
+/* Shell command handler for "reset" */
+static int cmd_reset(const struct shell *sh, size_t argc, char **argv)
+{
+    shell_print(sh, "Rebooting system...");
+    k_sleep(K_MSEC(100)); // Optional delay for user to see the message
+    sys_reboot(SYS_REBOOT_WARM);
+    return 0;
+}
+
+static int cmd_download(const struct shell *sh, size_t argc, char **argv)
+{
+    int rc;
+    
+    /* Set boot mode to serial recovery */
+    rc = bootmode_set(BOOT_MODE_TYPE_BOOTLOADER);
+    if (rc < 0) {
+        shell_error(sh, "Failed to set boot mode: %d", rc);
+        return rc;
+    }
+    
+    shell_print(sh, "Boot mode set to recovery. Rebooting to bootloader...");
+    k_sleep(K_MSEC(100));
+    sys_reboot(SYS_REBOOT_WARM);
+    return 0;
+}
+
+/* Register the shell command */
+SHELL_CMD_REGISTER(reset, NULL, "Reboot the system", cmd_reset);
+SHELL_CMD_REGISTER(download, NULL, "Download firmware", cmd_download);
+
+int main(void){
+    printk("Bootloader test version %s\n", APP_VERSION_EXTENDED_STRING);
+    return 0;
+}

software/apps/snippets/bootloader/sysbuild.conf

@@ -0,0 +1,5 @@
+# Sysbuild configuration for firmware_node with MCUboot
+
+# Enable MCUboot as bootloader
+SB_CONFIG_BOOTLOADER_MCUBOOT=y
+SB_CONFIG_MCUBOOT_MODE_SINGLE_APP=y

software/apps/snippets/bootloader/sysbuild/bootloader.overlay

@@ -0,0 +1,13 @@
+/*
+ * Copyright (c) 2021 Nordic Semiconductor ASA
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include "flash_partitions_128kb.dtsi"
+
+/ {
+	chosen {
+		zephyr,code-partition = &slot0_partition;
+	};
+};

software/apps/snippets/bootloader/sysbuild/flash_partitions_128kb.dtsi

@@ -0,0 +1,62 @@
+/*
+ * Devicetree Overlay for 128KB Flash
+ * - MCUboot Bootloader (32KB)
+ * - Application Slot (96KB)
+ */
+
+&flash0 {
+        /delete-node/ partitions;
+        partitions {
+                compatible = "fixed-partitions";
+                #address-cells = <1>;
+                #size-cells = <1>;
+
+                boot_partition: partition@0 {
+                        label = "mcuboot";
+                        reg = <0x00000000 DT_SIZE_K(32)>;
+                        read-only;
+                };
+
+                slot0_partition: partition@8000 {
+                        label = "image-0";
+                        reg = <0x00008000 DT_SIZE_K(96)>;
+                };
+        };
+};
+
+/* Add retention memory to the existing SRAM node */
+&sram0 {
+        #address-cells = <1>;
+        #size-cells = <1>;
+        
+        retainedmem {
+                compatible = "zephyr,retained-ram";
+                status = "okay";
+                #address-cells = <1>;
+                #size-cells = <1>;
+                
+                boot_mode: retention@7f00 {
+                        compatible = "zephyr,retention";
+                        status = "okay";
+                        reg = <0x7f00 0x100>;
+                        prefix = [08 04];
+                        checksum = <1>;
+                };
+        };
+};
+
+/ {
+        chosen {
+                zephyr,boot-mode = &boot_mode;
+                zephyr,console = &cdc_acm_uart0;
+    };
+};
+
+&zephyr_udc0 {
+    status = "okay";
+    
+    cdc_acm_uart0: cdc_acm_uart0 {
+        compatible = "zephyr,cdc-acm-uart";
+        label = "CDC_ACM_0";
+    };
+};

software/apps/snippets/bootloader/sysbuild/mcuboot.conf

@@ -0,0 +1,46 @@
+#
+# MCUboot Configuration for Serial Recovery over USB-CDC
+#
+
+# Enables serial recovery mode in MCUboot.
+CONFIG_MCUBOOT_SERIAL=y
+
+# Tell MCUboot to check for a trigger to enter recovery
+CONFIG_BOOT_SERIAL_BOOT_MODE=y
+
+# --- USB Stack Configuration ---
+CONFIG_USB_DEVICE_STACK=y
+CONFIG_USB_DEVICE_PRODUCT="MCUboot Serial Recovery"
+
+# Use USB CDC ACM for MCUboot serial recovery (not UART)
+CONFIG_BOOT_SERIAL_CDC_ACM=y
+
+# --- Disable Zephyr Console to avoid conflicts ---
+# MCUboot's serial_adapter doesn't work well with the general console subsystem.
+CONFIG_UART_CONSOLE=n
+CONFIG_CONSOLE_HANDLER=n
+CONFIG_CONSOLE=n
+
+# --- Flash and Stream Configuration (required for IMG_MANAGER) ---
+CONFIG_FLASH=y
+CONFIG_STREAM_FLASH=y
+
+# --- mcumgr Configuration ---
+# MCUMGR requires NET_BUF, even for serial transport.
+CONFIG_NET_BUF=y
+CONFIG_NET_LOG=n
+
+# Enables the mcumgr library and necessary command handlers
+CONFIG_MCUMGR=y
+CONFIG_IMG_MANAGER=y
+CONFIG_MCUMGR_GRP_IMG=y
+CONFIG_MCUMGR_GRP_OS=y
+
+# --- Retention Configuration ---
+CONFIG_RETAINED_MEM=y
+CONFIG_RETENTION=y
+CONFIG_RETENTION_BOOT_MODE=y
+
+# --- Optional: Reduce memory usage ---
+CONFIG_MAIN_STACK_SIZE=2048
+CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=1024

software/apps/snippets/bootloader/sysbuild/mcuboot.overlay

@@ -0,0 +1,17 @@
+#include "flash_partitions_128kb.dtsi"
+
+/ {
+    chosen {
+        zephyr,code-partition = &boot_partition;
+        zephyr,console = &cdc_acm_uart0;
+    };
+};
+
+&zephyr_udc0 {
+    status = "okay";
+    
+    cdc_acm_uart0: cdc_acm_uart0 {
+        compatible = "zephyr,cdc-acm-uart";
+        label = "CDC_ACM_0";
+    };
+};

software/include/lib/valve.h

@@ -27,6 +27,7 @@ void valve_stop(void);
 enum valve_state valve_get_state(void);
 enum valve_movement valve_get_movement(void);
 uint16_t valve_get_motor_current(void);
+uint16_t valve_get_supply_voltage(void);
 
 void valve_set_max_open_time(uint16_t seconds);
 void valve_set_max_close_time(uint16_t seconds);

software/lib/valve/valve.c

@@ -3,9 +3,20 @@
 #include <zephyr/logging/log.h>
 #include <zephyr/device.h>
 #include <zephyr/drivers/gpio.h>
+#include <zephyr/drivers/adc.h>
 #include <lib/valve.h>
 
-LOG_MODULE_REGISTER(valve, LOG_LEVEL_INF);
+LOG_MODULE_REGISTER(valve, LOG_LEVEL_DBG);
+
+// ADC configuration for MULTISENSE (PA0)
+static const struct device *adc_dev = DEVICE_DT_GET(DT_NODELABEL(adc1));
+static const struct adc_channel_cfg adc_channel_cfg = {
+    .gain = ADC_GAIN_1,
+    .reference = ADC_REF_INTERNAL,  // STM32 only supports internal ref (1.2V)
+    .acquisition_time = ADC_ACQ_TIME_DEFAULT,  // Use default acquisition time
+    .channel_id = 1, // ADC1_IN1 (PA0)
+    .differential = 0,
+};
 
 static const struct valve_gpios valve_gpios = {
     .in0 = GPIO_DT_SPEC_GET(DT_NODELABEL(vnd7050aj), in0_gpios),
@@ -43,16 +54,29 @@ void valve_init(void)
     settings_load_one("valve/max_open_time", &max_opening_time_s, sizeof(max_opening_time_s));
     settings_load_one("valve/max_close_time", &max_closing_time_s, sizeof(max_closing_time_s));
 
-    gpio_pin_configure_dt(&valve_gpios.in0, GPIO_OUTPUT_INACTIVE);
-    gpio_pin_configure_dt(&valve_gpios.in1, GPIO_OUTPUT_INACTIVE);
-    gpio_pin_configure_dt(&valve_gpios.rst, GPIO_OUTPUT_ACTIVE);  // Keep VND7050AJ out of reset
-    gpio_pin_configure_dt(&valve_gpios.sen, GPIO_OUTPUT_INACTIVE);
+    // Initialize ADC for MULTISENSE
+    if (!device_is_ready(adc_dev)) {
+        LOG_ERR("ADC device not ready");
+        return;
+    }
+
+    int ret = adc_channel_setup(adc_dev, &adc_channel_cfg);
+    if (ret < 0) {
+        LOG_ERR("Could not setup ADC channel (%d)", ret);
+        return;
+    }
+
+    gpio_pin_configure_dt(&valve_gpios.in0, GPIO_OUTPUT_INACTIVE); // IN0 control pin - output, deactivate
+    gpio_pin_configure_dt(&valve_gpios.in1, GPIO_OUTPUT_INACTIVE); // IN1 control pin - output, deactivate
+    gpio_pin_configure_dt(&valve_gpios.rst, GPIO_OUTPUT_INACTIVE);  // Keep VND7050AJ in reset
+    gpio_pin_configure_dt(&valve_gpios.sen, GPIO_OUTPUT_INACTIVE);  // Sensor enable pin - output, inactive
+    // S0 and S1 pins are used for selecting the valve state, they are initially inactive
+    // and will be set to active when the valve is opened or closed.
     gpio_pin_configure_dt(&valve_gpios.s0, GPIO_OUTPUT_INACTIVE);  // S0 select pin - output
     gpio_pin_configure_dt(&valve_gpios.s1, GPIO_OUTPUT_INACTIVE);  // S1 select pin - output
     
     LOG_INF("Valve initialized: max_open=%us, max_close=%us", max_opening_time_s, max_closing_time_s);
 }
-}
 
 void valve_open(void)
 {
@@ -87,6 +111,105 @@ enum valve_state valve_get_state(void) { return current_state; }
 enum valve_movement valve_get_movement(void) { return current_movement; }
 uint16_t valve_get_motor_current(void) { return (current_movement != VALVE_MOVEMENT_IDLE) ? 150 : 10; }
 
+uint16_t valve_get_supply_voltage(void)
+{
+    LOG_INF("=== ADC TEST MODE - PA0 LAB SUPPLY TEST ===");
+    LOG_INF("Connect lab supply to PA0. Recommended: 1.0V");
+    LOG_INF("Expected raw value for 1.0V: ~2007 (using 2.048V VREFBUF)");
+    LOG_INF("ADC range: 0-2.048V (STM32G431 VREFBUF internal reference)");
+    LOG_INF("");
+    
+    // No VND7050AJ configuration - pure ADC test
+    // Just make sure pins are in safe state
+    gpio_pin_configure_dt(&valve_gpios.rst, GPIO_OUTPUT);
+    gpio_pin_configure_dt(&valve_gpios.sen, GPIO_OUTPUT); 
+    gpio_pin_configure_dt(&valve_gpios.s0, GPIO_OUTPUT);
+    gpio_pin_configure_dt(&valve_gpios.s1, GPIO_OUTPUT);
+    gpio_pin_configure_dt(&valve_gpios.in0, GPIO_OUTPUT);
+    gpio_pin_configure_dt(&valve_gpios.in1, GPIO_OUTPUT);
+    
+    // Set all VND7050AJ pins LOW for safety
+    gpio_pin_set_dt(&valve_gpios.rst, 0);
+    gpio_pin_set_dt(&valve_gpios.s0, 0);
+    gpio_pin_set_dt(&valve_gpios.s1, 0);
+    gpio_pin_set_dt(&valve_gpios.sen, 0);
+    gpio_pin_set_dt(&valve_gpios.in0, 0);
+    gpio_pin_set_dt(&valve_gpios.in1, 0);
+    
+    LOG_INF("VND7050AJ disabled - all pins LOW");
+    LOG_INF("PA0 is now isolated for lab supply testing");
+    k_msleep(100);
+    
+    // Setup simple ADC sequence
+    int16_t buf;
+    struct adc_sequence sequence = {
+        .buffer = &buf,
+        .buffer_size = sizeof(buf),
+        .channels = BIT(adc_channel_cfg.channel_id),
+        .resolution = 12,
+    };
+    
+    LOG_INF("Starting continuous ADC readings every 500ms...");
+    
+    // Continuous monitoring loop with improved stability
+    int reading_count = 0;
+    int32_t samples[10];  // Buffer for averaging
+    
+    while (1) {
+        // Take multiple samples and average them for stability
+        int valid_samples = 0;
+        int32_t sum = 0;
+        
+        for (int i = 0; i < 10; i++) {
+            k_msleep(50);  // Longer delay between samples for stability
+            int adc_ret = adc_read(adc_dev, &sequence);
+            
+            if (adc_ret == 0 && buf > 100) {  // Filter out near-zero readings (floating input)
+                samples[i] = buf;
+                sum += buf;
+                valid_samples++;
+            } else {
+                LOG_WRN("Sample %d invalid: raw=%d, ret=%d", i, buf, adc_ret);
+                samples[i] = 0;  // Mark as invalid
+            }
+        }
+        
+        if (valid_samples > 0) {
+            // Calculate average
+            int32_t avg_raw = sum / valid_samples;
+            
+            // Calculate voltage using the correct VREFBUF reference (2.048V)
+            int32_t pa0_mv = (avg_raw * 2048) / 4096;  // Using 2.048V VREFBUF
+            
+            // Calculate standard deviation to show stability
+            int32_t variance = 0;
+            for (int i = 0; i < valid_samples; i++) {
+                int32_t diff = samples[i] - avg_raw;
+                variance += diff * diff;
+            }
+            int32_t std_dev = (valid_samples > 1) ? variance / (valid_samples - 1) : 0;
+            
+            // Find min/max for this sample set
+            int32_t min_raw = samples[0], max_raw = samples[0];
+            for (int i = 1; i < valid_samples; i++) {
+                if (samples[i] < min_raw) min_raw = samples[i];
+                if (samples[i] > max_raw) max_raw = samples[i];
+            }
+            
+            LOG_INF("Reading %d: avg_raw=%d (%dmV) | range=%d-%d | std_dev=%d | samples=%d/10", 
+                    reading_count, (int)avg_raw, (int)pa0_mv,
+                    (int)min_raw, (int)max_raw, (int)std_dev, valid_samples);
+        } else {
+            LOG_ERR("Reading %d: All ADC samples failed", reading_count);
+        }
+        
+        reading_count++;
+        k_msleep(400);  // Wait before next reading set
+    }
+    
+    return 0;  // Never reached
+}
+
 void valve_set_max_open_time(uint16_t seconds) { max_opening_time_s = seconds; settings_save_one("valve/max_open_time", &max_opening_time_s, sizeof(max_opening_time_s)); }
 void valve_set_max_close_time(uint16_t seconds) { max_closing_time_s = seconds; settings_save_one("valve/max_close_time", &max_closing_time_s, sizeof(max_closing_time_s)); }
 uint16_t valve_get_max_open_time(void) { return max_opening_time_s; }

software/serial_monitor.py

@@ -0,0 +1,43 @@
+#!/usr/bin/env python3
+import serial
+import time
+import sys
+import argparse
+
+def monitor_serial(port):
+    try:
+        # Open serial connection
+        ser = serial.Serial(port, 115200, timeout=1)
+        print(f"Connected to {port}")
+        
+        # Send reset command
+        ser.write(b'reset\n')
+        print("Sent reset command")
+        
+        # Wait a bit and then read output
+        time.sleep(0.5)
+        
+        # Read output for 10 seconds
+        start_time = time.time()
+        while 1: #time.time() - start_time < 10:
+            if ser.in_waiting > 0:
+                data = ser.read(ser.in_waiting)
+                try:
+                    text = data.decode('utf-8', errors='ignore')
+                    print(text, end='')
+                except:
+                    print(f"Raw bytes: {data}")
+            time.sleep(0.1)
+        
+        ser.close()
+        print("\nSerial monitor closed")
+        
+    except Exception as e:
+        print(f"Error: {e}")
+        sys.exit(1)
+
+if __name__ == "__main__":
+    parser = argparse.ArgumentParser(description='Serial monitor.')
+    parser.add_argument('-p', '--port', help='Serial port to connect to', required=True)
+    args = parser.parse_args()
+    monitor_serial(args.port)

software/serial_reset_monitor.py

@@ -0,0 +1,55 @@
+#!/usr/bin/env python3
+import serial
+import time
+import sys
+
+def monitor_serial_with_reset():
+    try:
+        # Open serial port
+        ser = serial.Serial('/dev/ttyACM1', 115200, timeout=1)
+        print("Serial port opened successfully")
+        
+        # Clear any existing data
+        ser.flushInput()
+        ser.flushOutput()
+        
+        # Send reset command
+        print("Sending reset command...")
+        ser.write(b"reset\n")
+        time.sleep(0.1)
+        
+        # Read output for 10 seconds
+        print("Reading serial output...")
+        start_time = time.time()
+        output_lines = []
+        
+        while time.time() - start_time < 10:
+            if ser.in_waiting > 0:
+                try:
+                    line = ser.readline().decode('utf-8', errors='replace').strip()
+                    if line:
+                        print(f"[{time.time() - start_time:.3f}s] {line}")
+                        output_lines.append(line)
+                except Exception as e:
+                    print(f"Error reading line: {e}")
+            time.sleep(0.01)
+        
+        ser.close()
+        print("\nSerial monitoring complete")
+        
+        # Summary
+        print("\n=== SUMMARY ===")
+        supply_voltage_lines = [line for line in output_lines if "Supply voltage" in line]
+        if supply_voltage_lines:
+            print("Supply voltage readings:")
+            for line in supply_voltage_lines:
+                print(f"  {line}")
+        else:
+            print("No supply voltage readings found")
+            
+    except Exception as e:
+        print(f"Error: {e}")
+        sys.exit(1)
+
+if __name__ == "__main__":
+    monitor_serial_with_reset()