复制官网文章的代码 写一个QR.C 放在
D:\GKOSON_BACK_GARDEN\repository\RTT-GIT\rt-thread\bsp\stm32\stm32f412-koson625\applications
然后XSHELL

help
RT-Thread shell commands:
uart_sample      - uart device sample
reboot           - Reboot System
version          - show RT-Thread version information
list_thread      - list thread
list_sem         - list semaphore in system
list_event       - list event in system
list_mutex       - list mutex in system
list_mailbox     - list mail box in system
list_msgqueue    - list message queue in system
list_mempool     - list memory pool in system
list_timer       - list timer in system
list_device      - list device in system
help             - RT-Thread shell help.
ps               - List threads in the system.
time             - Execute command with time.
free             - Show the memory usage in the system.

msh >uart_sample
hello RT-Thread!
msh >

此时#define SAMPLE_UART_NAME       "uart1"

板子其实是6
此时#define SAMPLE_UART_NAME       "uart6"
则
msh >uart_sample
find uart6 failed!
msh >