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F28377s DMA数据传输问题



各位专家好:

         有个问题想向专家们请教:在使用DSP F28377s时,我需要通过DMA对ADC的采样数据进行传输,ADC的采样率固定,但是DMA每次需要传输的数据个数不固定,在DMA初始化配置时,
    DMACH5TransferConfig(datalen,0,1);这条语句定义了DMA收集到 datalen 这么多数据时触发传输中断,当datalen 值改变时,我是要重新配置DMA吗?还有没有更好的解决方式?