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1、利用keil MDK - RTE创建rt-thread（3.1.3）工程
2、添加main.c文件。
3、点击 <Option for target> ，选择ARM Compiter 为 <... version 5>。
4、Use MicroLIB 和 C99 Mode 视情况选择。
5、如果要使用shell，需要实现两个函数：void rt_hw_console_output(const char *str) 和 char
rt_hw_console_getchar(void)。
void rt_hw_console_output(const char *str) { uint16_t i = 0; while(1) {
if(*str == '\n') { comSendChar(COM1, '\r'); } comSendChar(COM1, *str);
if(*(++str) == '\0' || ++i == RT_CONSOLEBUF_SIZE) { break; } } } int
rt_hw_console_getchar(void) { uint8_t ucData; if(comGetChar(COM1, &ucData) ==
1) { return ucData; } return (-1); }
6、利用RT-Thread的组件初始化宏 INIT_BOARD_EXPORT(fn) 初始化串口，使用此宏可以在 rt_kprintf
函数被调用前初始化，否则会卡死。
7、如果要使用 finsh 中的历史记录功能，需要在 rtconfig.h 中添加定义：#define FINSH_USING_HISTORY
（感觉是RT-Thread忘记了）。
8、编译烧录下载运行，看到打印启动logo后说明运行正常，OK, Enjoy your RT-Thread 吧。
