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利用CSL库调用EDMA3，想手动设置触发，是不是在初始化EDMA3、设置好中断后，直接调动<CSL_edma3Aux.h>中的函数
CSL_IDEF_INLINE void CSL_edma3SetDMAChannelEvent
( CSL_Edma3Handle hModule, Int region, Uint8 dmaChannel)
就可以启动数据传输了？
手动触发EMDA应该使用CSL_EDMA3_CMD_CHANNEL_SET，
用下面函数中使用：
/* Trigger Channel */ CSL_edma3HwChannelControl(hChannel,CSL_EDMA3_CMD_CHANNEL_SET,NULL);
