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使用DMA接收时，空闲中断好像没法触发，要如果在使用dma同时也打开空闲中断？
只有中断模式可以接收不定长数据帧
先确认这个板卡LinFlexD是不是支持DMA+串口空闲中断,MD2是支持的，如果不支持可以用DMA加一个定时器
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帮助改进和优化YT CONFIG TOOL，有机会抽取YTM32B1ME0 EVB哦...
