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关于TMS320F28379D的DMA读取问题

Other Parts Discussed in Thread: TMS320F28379D

我目前正在调试TMS320F28379D的DMA功能。我希望外设通过DSP的8个引脚向DSP发送数据,然后DSP通过DMA将引脚上的数据传递到内存之中。但是DSP的一组引脚包含32位,我只希望使用其中的8位,那么我的数据源地址应该怎么写呢?