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关于EDMA传输时间的问题!?

用 edmaInitiateXferDoubleChain函数传输128字节和256字节差不多都花费了 2700ns 左右,为什么需要这么长的传输时间啊???

此外为什么传输256字节和128字节的速度差不多呢??

如果传输 5kByte 和 10kByte,传输速度还会差不多吗???