新建默认项目，终端不显示Hello RTThread

Device CPU  : Cortex-M4
Memory Programming ...
Opening and parsing file: rtthread.elf
  File          : rtthread.elf
  Size          : 24132 Bytes
  Address       : 0x08000000 
Erasing memory corresponding to segment 0:
Erasing internal memory sectors [0 11]
Download in Progress:
Progress: 100%
File download complete
Time elapsed during download operation: 00:00:00.873
MCU Reset
Software reset is performed
RUNNING Program ... 
  Address:      : 0x8000000
Application is running
Start operation achieved successfully
执行完毕, 耗时：1142ms.