调整 413 rtt 结构，预备添加 405 主工程

Signed-off-by: a1012112796 <1012112796@qq.com>

MDK_413/board/board.h

@@ -0,0 +1,50 @@
+/*
+ * Copyright (c) 2006-2021, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2018-11-5      SummerGift   first version
+ */
+
+#ifndef __BOARD_H__
+#define __BOARD_H__
+
+#include <rtthread.h>
+#include <stm32f4xx.h>
+#include "drv_common.h"
+#include "drv_gpio.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define STM32_FLASH_START_ADRESS     ((uint32_t)0x08000000)
+#define STM32_FLASH_SIZE             (1024 * 1024)
+#define STM32_FLASH_END_ADDRESS      ((uint32_t)(STM32_FLASH_START_ADRESS + STM32_FLASH_SIZE))
+
+#define STM32_SRAM_SIZE           320
+#define STM32_SRAM_END            (0x20000000 + STM32_SRAM_SIZE * 1024)
+
+#if defined(__ARMCC_VERSION)
+extern int Image$$RW_IRAM1$$ZI$$Limit;
+#define HEAP_BEGIN      (&Image$$RW_IRAM1$$ZI$$Limit)
+#elif __ICCARM__
+#pragma section="CSTACK"
+#define HEAP_BEGIN      (__segment_end("CSTACK"))
+#else
+extern int __bss_end;
+#define HEAP_BEGIN      (&__bss_end)
+#endif
+
+#define HEAP_END        STM32_SRAM_END
+
+void SystemClock_Config(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
+