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mcbsp的mdra引脚对地一直是3.3v?



我做mcbsp和i2s的通信,ad输出没有问题,由于采集到的数据一直是0xffff所以我进行了pin的测量,后来发现mdra引脚对 gnd一直是处于高电平,这是否是导致采集到数据0xffff的原因?如果是这个原因,那么是什么导致了mdra引脚始终是高电平????谢谢!!!