.\objects\project_l.axf: Error:L6218E:Undefined symbol data (referred from main.o)，
.\Objects\project_1.axf: Error: L6218E: Undefined symbol g_usart3_buf (referred from main.o).
.lObjects\project_1.axf: Error: L6218E: Undefined symbol g_usart3_event (xeferred from main.o)
.Not enough information to list image symbols.
Not enough information to list load addresses in the image map.Finished: 2 information
