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C6748 EDMA读取出0

大家好,

我在使用C6748通过I2S读取ADC的数据,C6748为从机,读取只保留右声道数据,数据位数为16位,当我使用轮训的方式读取时,读取的数据正常,但当使用EDMA读取时,读取的数据每一个间隔都有一个零(如下图),这是怎么回事。