STM32

STM32 DMA串口发送，FIFO错误中断频繁进

2019-07-14 15:00发布

站内问答 / STM32/STM8
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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： tica Neue, Helvetica, Arial">        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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5条回答
60user8
2019-07-14 23:44
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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