feat: Establish functional multi-app structure

This commit captures a working multi-app build where the board definition is located in the 'software' directory and explicitly included by the slave_node application. This serves as a stable baseline.

software/CMakeLists.txt

@@ -1,8 +1,6 @@
-# Top-level CMakeLists.txt for the irrigation system project
+# Top-level CMakeLists.txt for the multi-app setup
 
 cmake_minimum_required(VERSION 3.20)
 
-# Add the subdirectories for the applications and libraries
 add_subdirectory(apps/gateway)
-add_subdirectory(apps/slave_node)
+add_subdirectory(apps/slave_node)
-add_subdirectory(lib)

software/apps/gateway/prj.conf

@@ -1,3 +1,2 @@
-# Zephyr configuration for the Gateway
+# Gateway Configuration
 CONFIG_NETWORKING=y
-CONFIG_NET_TCP=y

software/apps/slave_node/CMakeLists.txt

@@ -1,6 +1,11 @@
 cmake_minimum_required(VERSION 3.20)
 
+# Point BOARD_ROOT and DTS_ROOT to the main 'software' directory
+# so Zephyr can find the 'boards' subdirectory there.
+list(APPEND BOARD_ROOT ${CMAKE_CURRENT_SOURCE_DIR}/../..)
+list(APPEND DTS_ROOT ${CMAKE_CURRENT_SOURCE_DIR}/../..)
+
 find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
 project(slave_node)
 
-target_sources(app PRIVATE src/main.c)
+target_sources(app PRIVATE src/main.c)

software/apps/slave_node/prj.conf

@@ -1,2 +1,7 @@
-# Zephyr configuration for the Slave Node
+# --- Base Slave Node Config ---
 CONFIG_GPIO=y
+
+# Use RTT for console output instead of UART
+CONFIG_USE_SEGGER_RTT=y
+CONFIG_RTT_CONSOLE=y
+CONFIG_UART_CONSOLE=n

software/apps/slave_node/src/main.c

@@ -8,6 +8,9 @@
 
 int main(void)
 {
-	printk("Hello from Slave Node!\n");
+	while (1) {
+		printk("Hello from Slave Node!\n");
+		k_msleep(1000);
+	}
 	return 0;
 }

software/boards/iten/bluepill_f103rb/Kconfig.bluepill_f103rb

@@ -0,0 +1,5 @@
+# Copyright (c) 2025 Eduard Iten
+# SPDX-License-Identifier: Apache-2.0
+
+config BOARD_BLUEPILL_F103RB
+	select SOC_STM32F103XB

software/boards/iten/bluepill_f103rb/bluepill_f103rb.dts

@@ -0,0 +1,106 @@
+/*
+ * Copyright (c) 2025 Eduard Iten
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/dts-v1/;
+#include <st/f1/stm32f1.dtsi>
+#include <st/f1/stm32f103Xb.dtsi>
+#include <st/f1/stm32f103r(8-b)tx-pinctrl.dtsi>
+#include <zephyr/dt-bindings/input/input-event-codes.h>
+
+/ {
+	model = "Blue-Pill STM32F103RB";
+	compatible = "iten,bluepill-f103rb";
+
+	chosen {
+		zephyr,console = &usart1;
+		zephyr,shell-uart = &usart1;
+		zephyr,sram = &sram0;
+		zephyr,flash = &flash0;
+	};
+
+	leds {
+		compatible = "gpio-leds";
+		led_status: led_status {
+			gpios = <&gpioc 13 GPIO_ACTIVE_LOW>;
+			label = "User LED";
+		};
+	};
+
+	aliases {
+		led0 = &led_status;
+		watchdog0 = &iwdg;
+	};
+};
+
+
+&clk_lsi {
+	status = "okay";
+};
+
+&clk_hse {
+	clock-frequency = <DT_FREQ_M(8)>;
+	status = "okay";
+};
+
+&pll {
+	mul = <9>;
+	clocks = <&clk_hse>;
+	status = "okay";
+};
+
+&rcc {
+	clocks = <&pll>;
+	clock-frequency = <DT_FREQ_M(72)>;
+	ahb-prescaler = <1>;
+	apb1-prescaler = <2>;
+	apb2-prescaler = <1>;
+	adc-prescaler = <6>;
+};
+
+
+&usart1 {
+	pinctrl-0 = <&usart1_tx_pa9 &usart1_rx_pa10>;
+	pinctrl-names = "default";
+	current-speed = <115200>;
+	status = "okay";
+};
+
+&iwdg {
+	status = "okay";
+};
+
+
+&clk_lsi {
+	status = "okay";
+};
+
+&clk_hse {
+	clock-frequency = <DT_FREQ_M(8)>;
+	status = "okay";
+};
+
+&pll {
+	mul = <9>;
+	clocks = <&clk_hse>;
+	status = "okay";
+};
+
+&rcc {
+	clocks = <&pll>;
+	clock-frequency = <DT_FREQ_M(72)>;
+	ahb-prescaler = <1>;
+	apb1-prescaler = <2>;
+	apb2-prescaler = <1>;
+	adc-prescaler = <6>;
+};
+
+&exti {
+	status = "okay";
+};
+
+&dma1 {
+	status = "okay";
+};

software/boards/iten/bluepill_f103rb/bluepill_f103rb_defconfig

@@ -0,0 +1,4 @@
+# Copyright (c) 2025 Eduard Iten
+# SPDX-License-Identifier: Apache-2.0
+CONFIG_SERIAL=y
+CONFIG_GPIO=y

software/boards/iten/bluepill_f103rb/board.cmake

@@ -0,0 +1,12 @@
+# Copyright (c) 2025 Eduard Iten
+# SPDX-License-Identifier: Apache-2.0
+
+# keep first
+board_runner_args(jlink "--device=STM32F103RB" "--speed=4000")
+board_runner_args(stm32cubeprogrammer "--port=swd" "--reset-mode=hw")
+
+# keep first
+include(${ZEPHYR_BASE}/boards/common/jlink.board.cmake)
+include(${ZEPHYR_BASE}/boards/common/stm32cubeprogrammer.board.cmake)
+include(${ZEPHYR_BASE}/boards/common/openocd-stm32.board.cmake)
+include(${ZEPHYR_BASE}/boards/common/blackmagicprobe.board.cmake)

software/boards/iten/bluepill_f103rb/board.yml

@@ -0,0 +1,8 @@
+# Copyright (c) 2025 Eduard Iten
+# SPDX-License-Identifier: Apache-2.0
+
+board:
+  name: bluepill_f103rb
+  vendor: iten
+  socs:
+  - name: stm32f103xb