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STM32F407ZET6的片子，采用DMA进行串口发送，DMA部分相关固定配置如下： DMA_InitStructure.DMA_BufferSize = 255;//固定要发送的字节长度
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte; DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte; DMA_InitStructure.DMA_Mode = DMA_Mode_Normal; DMA_InitStructure.DMA_Priority = DMA_Priority_VeryHigh; DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable; DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_Full; DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single; DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single; DMA在发送中断中，置完成标志位，下次发送时检查该标志位，发送完成则再次发送。 发送能正常发送，发送完成中断也能正常进，但每次发送时都会先进FIFO错误中断。何解？？？？ 
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In direct mode, the FIFO error flag can also be set under the following conditions:
• In the peripheral-to-memory mode, the FIFO can be saturated (overrun) if the memory bus is not granted for several peripheral requests • In the memory-to-peripheral mode, an underrun condition may occur if the memory bus has not been granted before a peripheral request occurs If the TEIFx or the FEIFx flag is set due to incompatibility between burst size and FIFO threshold level, the faulty stream is automatically disabled through a hardware clear of its EN bit in the corresponding stream configuration register (DMA_SxCR). |
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在配置完DMA之后，再使能串口触发DMA发送 该问题即可解决 每次DMA发送之侯，下次发送之前 关闭一下 串口触发DMA发送，使能DMA之后再将使能打开
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