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+/*!
+    \file  main.c
+    \brief GD32F4xx 工程模板入口（LED 心跳 + 串口收发框架）
+
+    基于 GD32E23x 工程模板移植，目标芯片 GD32F405RET6（Cortex-M4 @168MHz，512KB Flash）。
+*/
+
+/*
+    Copyright (c) 2025, GigaDevice Semiconductor Inc.
+
+    Redistribution and use in source and binary forms, with or without modification,
+are permitted provided that the following conditions are met:
+
+    1. Redistributions of source code must retain the above copyright notice, this
+       list of conditions and the following disclaimer.
+    2. Redistributions in binary form must reproduce the above copyright notice,
+       this list of conditions and the following disclaimer in the documentation
+       and/or other materials provided with the distribution.
+    3. Neither the name of the copyright holder nor the names of its contributors
+       may be used to endorse or promote products derived from this software without
+       specific prior written permission.
+
+    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
+INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+OF SUCH DAMAGE.
+*/
+
+#include "gd32f4xx.h"
+#include "systick.h"
+#include "uart.h"
+#include "uart_ring_buffer.h"
+#include "led.h"
+#include <stdio.h>
+#include "board_config.h"
+
+/* TODO: 以下模块尚未从 GD32E23x 工程移植，编译验证通过后逐步补充：
+ *   - i2c.c/i2c.h      I2C 主机读写驱动（硬件 I2C0 + 总线恢复）
+ *   - command.c/h      串口命令协议解析（D5 帧格式）
+ * 移植时将对应文件加入 CMakeLists.txt 的 TARGET_SRC 即可。
+ */
+
+/*!
+    \brief      main function
+    \param[in]  none
+    \param[out] none
+    \retval     none
+*/
+int main(void)
+{
+    led_init();
+
+    systick_config();
+
+    uart_ring_buffer_init();
+    uart_init();
+
+#if DEBUG_MODE == CFG_ENABLE
+    printf("Hello World!\r\n");
+    printf("GD32F405 template, flash size: %u KB\r\n", GD32_FLASH_SIZE_KB);
+#endif
+
+#if SEGGER_RTT_DETECTION == CFG_ENABLE
+    RTT_printf(0, "Hello World!\r\n");
+#endif
+    printf("Hello World!\r\n");
+
+    /* ========== Command Testing ========== */
+
+    /* ========== */
+
+    while(1){
+        /* TODO: command_process();  命令模块移植后启用 */
+        delay_ms(10);
+    }
+}