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| ..\Output\串口通信.axf: Error: L6218E: Undefined symbol DMA_GetITStatus (referred from stm32f10x_it.o). ..\Output\串口通信.axf: Error: L6218E: Undefined symbol DMA_Cmd (referred from dma.o).
 ..\Output\串口通信.axf: Error: L6218E: Undefined symbol DMA_ITConfig (referred from dma.o).
 ..\Output\串口通信.axf: Error: L6218E: Undefined symbol DMA_Init (referred from dma.o).
 
 stm32f10x_conf.h里面已经取消 dma.h的注释了,  不知道什么原因
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