AM3352 EDMA3的chain模式无法进行循环交替数据搬运，问题出在哪里？？？？

当前功能是EDMA3对McASP设备进行数据搬运，用2个edma channel进行数据传输并且使用chain方式传输。每个channel都配置为(ACNT=8,BCNT=2,CCNT=1,ASYNC),linkAddr都指向对方的PaRAM地址。测试结果是两个edma channel都能够正确进行一次EDMA事件（搬运16个字节），但无法进行chain的交替使用，请问我的配置问题出在哪里呢？

具体代码如下： 1. channel 申请 ，PaRAM配置  

edma_mcasp_chn1 = edma_alloc_channel(EDMA3_CHA_MCASP0_RX,mcasp_callback_rxedma,NULL,EVENTQ_0);  if (edma_mcasp_chn1 < 0) {   DMA_PRINTK(", error:%d", edma_mcasp_chn1);   goto error_alloc_channel;   }

 edma_mcasp_chn2 = edma_alloc_channel(-1,mcasp_callback_rxedma,NULL,EVENTQ_0);

 if (edma_mcasp_chn1 < 0) {   DMA_PRINTK(", error:%d", edma_mcasp_chn2);   goto error_alloc_channel1;   }

// two channel chained configuration.  

edma_set_src (edma_mcasp_chn1, (unsigned long)(AM335X_MCASP0_Data), INCR, W8BIT);

 edma_set_dest (edma_mcasp_chn1, (unsigned long)(mcaspadc_dev->r_dma_Iping), INCR, W8BIT);

 edma_set_src_index (edma_mcasp_chn1, iacnt, iacnt);  

edma_set_dest_index (edma_mcasp_chn1, iacnt, iacnt);  /* A Sync Transfer Mode */

 edma_set_transfer_params (edma_mcasp_chn1, iacnt, 1, 1, 1, ASYNC);

 edma_set_src (edma_mcasp_chn2, (unsigned long)(AM335X_MCASP0_Data), INCR, W8BIT);  

edma_set_dest (edma_mcasp_chn2, (unsigned long)(mcaspadc_dev->r_dma_Qping), INCR, W8BIT);

 edma_set_src_index (edma_mcasp_chn2, iacnt, iacnt);  

edma_set_dest_index (edma_mcasp_chn2, iacnt, iacnt);  /* A Sync Transfer Mode */

 edma_set_transfer_params (edma_mcasp_chn2, iacnt, 1, 1, 1, ASYNC);

 /* Chain both the channels */  

edma_read_slot(edma_mcasp_chn1, &paramSet);  

paramSet.opt |= (1 << TCCHEN_SHIFT);

 paramSet.opt |= EDMA_TCC(EDMA_CHAN_SLOT(edma_mcasp_chn2));  

edma_write_slot(edma_mcasp_chn1, &paramSet);

/*   * Enable the Intermediate and Final Interrupts on Channel 1.   * Also, Enable the Intermediate Chaining.   */  

edma_read_slot(edma_mcasp_chn1, &paramSet);  

paramSet.opt |= (1 << ITCCHEN_SHIFT);

 paramSet.opt |= (1 << TCINTEN_SHIFT);

 paramSet.opt |= (1 << ITCINTEN_SHIFT);

 edma_write_slot(edma_mcasp_chn1, &paramSet);

  /* Enable the Intermediate and Final Interrupts on Channel 2 */  

edma_read_slot(edma_mcasp_chn2, &paramSet);  

paramSet.opt |= (1 << TCINTEN_SHIFT);  

paramSet.opt |= (1 << ITCINTEN_SHIFT);  

edma_write_slot(edma_mcasp_chn2, &paramSet);        

2. channel 回调函数 mcasp_callback_rxedma只进行数据copy到buffer.