From 3f0d5a76c65cfbec12781dd59f3deaf34dedf1a1 Mon Sep 17 00:00:00 2001
From: Eduard Iten <eduard@iten.pro>
Date: Thu, 3 Jul 2025 14:31:17 +0200
Subject: [PATCH] feat(cdc_acm): Add CDC-ACM support and remove old test
 applications

- Implemented CDC-ACM (USB Virtual COM Port) support for the slave_node application.
- Removed the now obsolete 'hello_world' and 'stm32g431_tests' applications.
---
 software/apps/hello_world/CMakeLists.txt      |  6 ------
 software/apps/hello_world/prj.conf            |  4 ----
 software/apps/hello_world/src/main.c          |  9 ---------
 software/apps/slave_node/cdc-acm.overlay      | 10 ++++++++++
 software/apps/slave_node/overlay-cdc-acm.conf |  4 ++++
 software/apps/stm32g431_tests/CMakeLists.txt  |  6 ------
 software/apps/stm32g431_tests/prj.conf        |  4 ----
 software/apps/stm32g431_tests/src/main.c      |  9 ---------
 8 files changed, 14 insertions(+), 38 deletions(-)
 delete mode 100644 software/apps/hello_world/CMakeLists.txt
 delete mode 100644 software/apps/hello_world/prj.conf
 delete mode 100644 software/apps/hello_world/src/main.c
 create mode 100644 software/apps/slave_node/cdc-acm.overlay
 create mode 100644 software/apps/slave_node/overlay-cdc-acm.conf
 delete mode 100644 software/apps/stm32g431_tests/CMakeLists.txt
 delete mode 100644 software/apps/stm32g431_tests/prj.conf
 delete mode 100644 software/apps/stm32g431_tests/src/main.c

diff --git a/software/apps/hello_world/CMakeLists.txt b/software/apps/hello_world/CMakeLists.txt
deleted file mode 100644
index 8728b9c..0000000
--- a/software/apps/hello_world/CMakeLists.txt
+++ /dev/null
@@ -1,6 +0,0 @@
-cmake_minimum_required(VERSION 3.20)
-
-find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
-project(hello_world)
-
-target_sources(app PRIVATE src/main.c)
diff --git a/software/apps/hello_world/prj.conf b/software/apps/hello_world/prj.conf
deleted file mode 100644
index bfb4912..0000000
--- a/software/apps/hello_world/prj.conf
+++ /dev/null
@@ -1,4 +0,0 @@
-
-CONFIG_CONSOLE=y
-CONFIG_LOG=y
-CONFIG_UART_CONSOLE=y
\ No newline at end of file
diff --git a/software/apps/hello_world/src/main.c b/software/apps/hello_world/src/main.c
deleted file mode 100644
index dbec9a8..0000000
--- a/software/apps/hello_world/src/main.c
+++ /dev/null
@@ -1,9 +0,0 @@
-#include <zephyr/kernel.h>
-#include <zephyr/sys/printk.h>
-
-int main(void)
-{
-	printk("Hello World! %s\n", CONFIG_BOARD);
-	return 0;
-}
-
diff --git a/software/apps/slave_node/cdc-acm.overlay b/software/apps/slave_node/cdc-acm.overlay
new file mode 100644
index 0000000..4f20541
--- /dev/null
+++ b/software/apps/slave_node/cdc-acm.overlay
@@ -0,0 +1,10 @@
+&zephyr_udc0 {
+	cdc_acm_uart0: cdc_acm_uart0 {
+		compatible = "zephyr,cdc-acm-uart";
+
+		modbus0 {
+			compatible = "zephyr,modbus-serial";
+			status = "okay";
+		};
+	};
+};
\ No newline at end of file
diff --git a/software/apps/slave_node/overlay-cdc-acm.conf b/software/apps/slave_node/overlay-cdc-acm.conf
new file mode 100644
index 0000000..2b6aa2e
--- /dev/null
+++ b/software/apps/slave_node/overlay-cdc-acm.conf
@@ -0,0 +1,4 @@
+CONFIG_USB_DEVICE_STACK=y
+CONFIG_USB_DEVICE_PRODUCT="Modbus slave node"
+CONFIG_UART_LINE_CTRL=y
+CONFIG_USB_DEVICE_INITIALIZE_AT_BOOT=n
\ No newline at end of file
diff --git a/software/apps/stm32g431_tests/CMakeLists.txt b/software/apps/stm32g431_tests/CMakeLists.txt
deleted file mode 100644
index 76964d1..0000000
--- a/software/apps/stm32g431_tests/CMakeLists.txt
+++ /dev/null
@@ -1,6 +0,0 @@
-cmake_minimum_required(VERSION 3.20)
-
-find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
-project(stm32g431_tests)
-
-target_sources(app PRIVATE src/main.c)
diff --git a/software/apps/stm32g431_tests/prj.conf b/software/apps/stm32g431_tests/prj.conf
deleted file mode 100644
index bfb4912..0000000
--- a/software/apps/stm32g431_tests/prj.conf
+++ /dev/null
@@ -1,4 +0,0 @@
-
-CONFIG_CONSOLE=y
-CONFIG_LOG=y
-CONFIG_UART_CONSOLE=y
\ No newline at end of file
diff --git a/software/apps/stm32g431_tests/src/main.c b/software/apps/stm32g431_tests/src/main.c
deleted file mode 100644
index dbec9a8..0000000
--- a/software/apps/stm32g431_tests/src/main.c
+++ /dev/null
@@ -1,9 +0,0 @@
-#include <zephyr/kernel.h>
-#include <zephyr/sys/printk.h>
-
-int main(void)
-{
-	printk("Hello World! %s\n", CONFIG_BOARD);
-	return 0;
-}
-