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C6655的EDMA3不搬移数据

用EDMA3接收来自MCBSP接口的数据,中断配置到INT8,程序进不了中断服务程序,手动将ISR的第8位置1,程序可以连续进到中断服务程序,但发现EDMA并没有收到来自串口的数据,串口实际是有数据的,从Memory 中查看BCONT和目的地址是增加的,可目的地址所在的缓冲器却没收到数据,求大神指点!