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TMS320C6678: EDMA例程无法正确传输数据

Part Number: TMS320C6678

使用的是pdk目录下的edma3例程,跑了其中一个乒乓的函数,昨天dstbuff数据正确,今天怎么调dstbuff都是0,srcbuff是正常的。请问各位专家是哪里出现了问题,代码没有改动,谢谢。