..OBJADC.axf: Error: L6218E: Undefined symbol TIM_ClearFlag (referred from usmart.o).
..OBJADC.axf: Error: L6218E: Undefined symbol TIM_ClearITPendingBit (referred from usmart.o).
..OBJADC.axf: Error: L6218E: Undefined symbol TIM_Cmd (referred from usmart.o).
..OBJADC.axf: Error: L6218E: Undefined symbol TIM_GetCounter (referred from usmart.o).
..OBJADC.axf: Error: L6218E: Undefined symbol TIM_GetFlagStatus (referred from usmart.o).
..OBJADC.axf: Error: L6218E: Undefined symbol TIM_GetITStatus (referred from usmart.o).
..OBJADC.axf: Error: L6218E: Undefined symbol TIM_ITConfig (referred from usmart.o).
..OBJADC.axf: Error: L6218E: Undefined symbol TIM_SetAutoreload (referred from usmart.o).
..OBJADC.axf: Error: L6218E: Undefined symbol TIM_SetCounter (referred from usmart.o).
..OBJADC.axf: Error: L6218E: Undefined symbol TIM_TimeBaseInit (referred from usmart.o).
Not enough information to list image symbols.
这些错误都是属于没有添加时钟文件：
