.\Objects\xinchengxu.axf: Error: L6218E: Undefined symbol mm_scan_GPIO_Config (referred from main_1.o).
.\Objects\xinchengxu.axf: Error: L6218E: Undefined symbol mm_scan (referred from main_1.o).
.\Objects\xinchengxu.axf: Error: L6218E: Undefined symbol SystemCoreClock (referred from delay.o).
.\Objects\xinchengxu.axf: Error: L6218E: Undefined symbol SystemInit (referred from startup_stm32f10x_hd.o).