用6713的McBsp直接读入采集ADS1274的信号并用EDMA搬移到缓存中直接观察时,发现采集的正信号区域都是正确的且线性的,但在采集负信号时,就会对应输入的值输出不正确且为非线性的。
若怀疑是AD有问题,但AD对应正值的转换是正确的;若怀疑DSP有问题,但DSP只是McBsp直接读取并用EDMA搬移在缓存中直接观察的,且正值正确。
请问是什么原因呢?
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