feat: Integrate VND7050AJ driver and enhance gateway settings

This commit introduces the VND7050AJ driver as a new submodule and integrates it into the project.

Key changes include:
- Added  as a git submodule.
- Enhanced the gateway application () with LittleFS and the settings subsystem.
  - Implemented new shell commands (, , ) for managing custom settings.
  - Added functionality to compact the settings file.
- Updated  to include new library dependencies and log  return code.
- Adjusted include paths for  in relevant files.
Signed-off-by: Eduard Iten <eduard@iten.pro>

software/apps/gateway/prj.conf

@@ -1,28 +1,47 @@
-# Enable logging
+# -------------------
+# Logging and Console
+# -------------------
 CONFIG_LOG=y
 CONFIG_UART_CONSOLE=y
 
-# Enable shell
+# -------------
+# Zephyr Shell
+# -------------
 CONFIG_SHELL=y
 CONFIG_KERNEL_SHELL=y
 CONFIG_REBOOT=y
 
-# Enable MCUMGR 
+# -------------------
+# MCUmgr OS Management
+# -------------------
 CONFIG_MCUMGR=y
-
-# Enable MCUMGR OS management group only
 CONFIG_MCUMGR_GRP_OS=y
-
-# Configure MCUMGR transport to UART
 CONFIG_MCUMGR_TRANSPORT_UART=y
 
+# -------------------
+# MCUmgr Filesystem Group
+# -------------------
+CONFIG_MCUMGR_GRP_FS=y
+
+# -------------------
+# LittleFS and Flash
+# -------------------
+CONFIG_FILE_SYSTEM=y
+CONFIG_FILE_SYSTEM_LITTLEFS=y
+CONFIG_FLASH=y
+CONFIG_FLASH_MAP=y
+
+# -------------------
+# Settings Subsystem
+# -------------------
+CONFIG_SETTINGS=y
+CONFIG_SETTINGS_FILE=y
+CONFIG_SETTINGS_FILE_PATH="/lfs/settings.bin"
+
+# -------------------
 # Dependencies
+# -------------------
 CONFIG_NET_BUF=y
 CONFIG_ZCBOR=y
 CONFIG_CRC=y
 CONFIG_BASE64=y
-
-CONFIG_MCUMGR_GRP_IMG=y
-CONFIG_IMG_MANAGER=y
-CONFIG_MCUBOOT_IMG_MANAGER=y
-CONFIG_STREAM_FLASH=y

software/apps/gateway/src/main.c

@@ -1,11 +1,136 @@
+#include <zephyr/fs/fs.h>
+#include <zephyr/fs/littlefs.h>
 #include <zephyr/kernel.h>
 #include <zephyr/logging/log.h>
+#include <zephyr/settings/settings.h>
+#include <zephyr/shell/shell.h>
 #include <app_version.h>
+#include <string.h>
 
 LOG_MODULE_REGISTER(hello_world);
 
+/* LittleFS mount configuration for 'storage_partition' partition */
+FS_LITTLEFS_DECLARE_DEFAULT_CONFIG(storage_partition);
+static struct fs_mount_t littlefs_mnt = {
+    .type = FS_LITTLEFS,
+    .mnt_point = "/lfs",
+    .fs_data = &storage_partition, // default config macro
+    .storage_dev = (void *)FIXED_PARTITION_ID(storage_partition),
+};
+
+static char my_setting[32] = "default";
+
+static int my_settings_set(const char *name, size_t len, settings_read_cb read_cb, void *cb_arg)
+{
+	if (strcmp(name, "value") == 0) {
+		if (len > sizeof(my_setting) - 1) {
+			len = sizeof(my_setting) - 1;
+		}
+		if (read_cb(cb_arg, my_setting, len) == len) {
+			my_setting[len] = '\0';
+			return 0;
+		}
+		return -EINVAL;
+	}
+	return -ENOENT;
+}
+
+static int my_settings_export(int (*export_func)(const char *, const void *, size_t))
+{
+	return export_func("my/setting/value", my_setting, strlen(my_setting));
+}
+
+SETTINGS_STATIC_HANDLER_DEFINE(my, "my/setting", NULL, my_settings_set, NULL, my_settings_export);
+
+static int cmd_my_get(const struct shell *shell, size_t argc, char **argv)
+{
+	shell_print(shell, "my_setting = '%s'", my_setting);
+	return 0;
+}
+
+static int cmd_my_reset(const struct shell *shell, size_t argc, char **argv)
+{
+	strcpy(my_setting, "default");
+	settings_save();
+	shell_print(shell, "my_setting reset to default");
+	return 0;
+}
+
+// Improved set command: join all arguments for whitespace support
+static int cmd_my_set(const struct shell *shell, size_t argc, char **argv)
+{
+	if (argc < 2) {
+		shell_error(shell, "Usage: my set <value>");
+		return -EINVAL;
+	}
+	// Join all argv[1..] with spaces
+	size_t i, pos = 0;
+	my_setting[0] = '\0';
+	for (i = 1; i < argc; ++i) {
+		size_t left = sizeof(my_setting) - 1 - pos;
+		if (left == 0)
+			break;
+		strncat(my_setting, argv[i], left);
+		pos = strlen(my_setting);
+		if (i < argc - 1 && left > 1) {
+			strncat(my_setting, " ", left - 1);
+			pos = strlen(my_setting);
+		}
+	}
+	my_setting[sizeof(my_setting) - 1] = '\0';
+	settings_save();
+	shell_print(shell, "my_setting set to '%s'", my_setting);
+	return 0;
+}
+
+SHELL_STATIC_SUBCMD_SET_CREATE(my_subcmds,
+    SHELL_CMD(get, NULL, "Get my_setting", cmd_my_get),
+    SHELL_CMD(set, NULL, "Set my_setting (supports spaces)", cmd_my_set),
+    SHELL_CMD(reset, NULL, "Reset my_setting to default and compact settings file", cmd_my_reset),
+    SHELL_SUBCMD_SET_END);
+
+SHELL_CMD_REGISTER(my, &my_subcmds, "My settings commands", NULL);
+
+static void compact_settings_file(void)
+{
+	struct fs_file_t file;
+	fs_file_t_init(&file);
+	int rc = fs_open(&file, "/lfs/settings.bin", FS_O_WRITE | FS_O_CREATE | FS_O_TRUNC);
+	if (rc == 0) {
+		fs_close(&file);
+		LOG_INF("Settings file compacted (truncated and recreated)");
+	} else if (rc == -ENOENT) {
+		LOG_INF("Settings file did not exist, created new");
+	} else {
+		LOG_ERR("Failed to compact settings file (%d)", rc);
+	}
+	settings_save();
+}
+
 int main(void)
 {
+	int rc = fs_mount(&littlefs_mnt);
+	if (rc < 0) {
+		LOG_ERR("Error mounting LittleFS [%d]", rc);
+	} else {
+		LOG_INF("LittleFS mounted at /lfs");
+	}
+
+	/* Initialize settings subsystem */
+	settings_subsys_init();
+	LOG_INF("Settings subsystem initialized");
+
+	/* Load settings from storage */
+	rc = settings_load();
+	if (rc == 0) {
+		LOG_INF("Settings loaded: my_setting='%s'", my_setting);
+	} else {
+		LOG_ERR("Failed to load settings (%d)", rc);
+	}
+
+	/* Compact settings file on each start */
+	compact_settings_file();
+
 	LOG_INF("Hello World! Version: %s", APP_VERSION_EXTENDED_STRING);
 	return 0;
 }

software/apps/gateway/sysbuild/gateway.overlay

@@ -6,7 +6,3 @@
         zephyr,code-partition = &slot0_partition;
     };
 };
-
-&usb_serial {
-    status = "okay";
-};

software/apps/slave_node/CMakeLists.txt

@@ -3,6 +3,8 @@ cmake_minimum_required(VERSION 3.20)
 find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
 
 project(slave_node LANGUAGES C)
+
 zephyr_include_directories(../../include)
 add_subdirectory(../../lib lib)
+
 target_sources(app PRIVATE src/main.c)

software/apps/slave_node/boards/native_sim.overlay

@@ -0,0 +1,47 @@
+/ {
+	aliases {
+		vnd7050aj = &vnd7050aj;
+	};
+
+	vnd7050aj: vnd7050aj {
+		compatible = "st,vnd7050aj";
+		status = "okay";
+
+		input0-gpios = <&gpio0 1 GPIO_ACTIVE_HIGH>;
+		input1-gpios = <&gpio0 2 GPIO_ACTIVE_HIGH>;
+		select0-gpios = <&gpio0 3 GPIO_ACTIVE_HIGH>;
+		select1-gpios = <&gpio0 4 GPIO_ACTIVE_HIGH>;
+		sense-enable-gpios = <&gpio0 5 GPIO_ACTIVE_HIGH>;
+		fault-reset-gpios = <&gpio0 6 GPIO_ACTIVE_LOW>;
+		io-channels = <&adc0 0>;
+		r-sense-ohms = <1500>;
+		k-vcc = <4000>;
+	};
+
+	modbus_uart: uart_2 {
+		compatible = "zephyr,native-pty-uart";
+		status = "okay";
+		current-speed = <19200>;
+
+		modbus0: modbus0 {
+			compatible = "zephyr,modbus-serial";
+			status = "okay";
+		};
+	};
+
+};
+
+&adc0 {
+	#address-cells = <1>;
+	#size-cells = <0>;
+	ref-internal-mv = <3300>;
+	ref-external1-mv = <5000>;
+
+	channel@0 {
+		reg = <0>;
+		zephyr,gain = "ADC_GAIN_1";
+		zephyr,reference = "ADC_REF_INTERNAL";
+		zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;
+		zephyr,resolution = <12>;
+	};
+};

software/apps/slave_node/dts/bindings/st,vnd7050aj.yaml

@@ -0,0 +1,88 @@
+# Copyright (c) 2024, Eduard Iten
+# SPDX-License-Identifier: Apache-2.0
+
+description: |
+  STMicroelectronics VND7050AJ dual-channel high-side driver.
+  This is a GPIO and ADC controlled device.
+
+compatible: "st,vnd7050aj"
+
+include: base.yaml
+
+properties:
+  input0-gpios:
+    type: phandle-array
+    required: true
+    description: GPIO to control output channel 0.
+
+  input1-gpios:
+    type: phandle-array
+    required: true
+    description: GPIO to control output channel 1.
+
+  select0-gpios:
+    type: phandle-array
+    required: true
+    description: GPIO for MultiSense selection bit 0.
+
+  select1-gpios:
+    type: phandle-array
+    required: true
+    description: GPIO for MultiSense selection bit 1.
+
+  sense-enable-gpios:
+    type: phandle-array
+    required: true
+    description: GPIO to enable the MultiSense output.
+
+  fault-reset-gpios:
+    type: phandle-array
+    required: true
+    description: GPIO to reset a latched fault (active-low).
+
+  io-channels:
+    type: phandle-array
+    required: true
+    description: |
+      ADC channel connected to the MultiSense pin. This should be an
+      io-channels property pointing to the ADC controller and channel number.
+
+  r-sense-ohms:
+    type: int
+    required: true
+    description: |
+      Value of the external sense resistor connected from the MultiSense
+      pin to GND, specified in Ohms. This is critical for correct
+      conversion of the analog readings.
+
+  k-factor:
+    type: int
+    default: 1500
+    description: |
+      Factor between PowerMOS and SenseMOS.
+
+  k-vcc:
+    type: int
+    default: 8000
+    description: |
+      VCC sense ratio multiplied by 1000. Used for supply voltage calculation.
+
+  t-sense-0:
+    type: int
+    default: 25
+    description: |
+      Temperature sense reference temperature in degrees Celsius.
+
+  v-sense-0:
+    type: int
+    default: 2070
+    description: |
+      Temperature sense reference voltage in millivolts.
+
+  k-tchip:
+    type: int
+    default: -5500
+    description: |
+      Temperature sense gain coefficient multiplied by 1000.
+      Used for chip temperature calculation.
+

software/apps/slave_node/prj.conf

@@ -22,7 +22,7 @@ CONFIG_SETTINGS_LOG_LEVEL_DBG=y
 CONFIG_UART_INTERRUPT_DRIVEN=y
 CONFIG_MODBUS=y
 CONFIG_MODBUS_ROLE_SERVER=y
-CONFIG_MODBUS_BUFFER_SIZE=256
+CONFIG_MODBUS_LOG_LEVEL_DBG=y
 
 # Enable VND7050AJ
 CONFIG_VND7050AJ=y

software/apps/slave_node/src/main.c

@@ -9,6 +9,7 @@ LOG_MODULE_REGISTER(main, LOG_LEVEL_INF);
 
 int main(void)
 {
+	int rc;
 	LOG_INF("Starting Irrigation System Slave Node");
 
 	if (settings_subsys_init() || settings_load()) {
@@ -18,9 +19,10 @@ int main(void)
 	valve_init();
 	fwu_init();
 
-	if (modbus_server_init()) {
-		LOG_ERR("Modbus RTU server initialization failed");
-		return 0;
+	rc = modbus_server_init();
+	if (rc) {
+		LOG_ERR("Modbus server initialization failed: %d", rc);
+		return rc;
 	}
 
 	LOG_INF("Irrigation System Slave Node started successfully");

software/apps/slave_node/sysbuild.conf

@@ -0,0 +1,5 @@
+SB_CONFIG_BOOTLOADER_MCUBOOT=y
+SB_CONFIG_MCUBOOT_MODE_SINGLE_APP=y
+
+CONFIG_LOG=y
+CONFIG_MCUBOOT_LOG_LEVEL_INF=y