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看不太懂你的问题,EDMA搬移后,目的地址的数据和源地址的数据肯定一样,相当于memcpy,不需要什么重传机制。
除非你有cache问题,在EDMA读源地址时,先将源地址进行cache flush,在EDMA搬移后,将目的地址进行cache valid。严格来说后者可以省略因为L2默认自维护cache一致性。