建立工程，成功创建两个虚拟串口

2023-06-21 18:00:56 +08:00
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+# RT-Thread nano v3.1.5 Change Log
+
+Change log since v3.1.3
+
+## Kernel
+
+- update src from released rt-thread v3.1.5
+- update code style and license
+
+## libcpu
+
+- add cortex-m23 
+- add cortex-m33 
+
+## components
+
+- add device.c
+
+## bsp
+
+- add samples for gd32e230k-msh
+- add samples for lpc55s69-blink
+