keil ARM与虚拟串口联调设置及解决办法.docx

详细图文介绍keil5 STM32F103C8使用虚拟串口仿真的环境设置，及 error 30, line 2: undefined name of virtual register access violation at 0x40021000 : no 'read' permission error 127, line 2: Com channel not opened, use MODE command first 的解决办法