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requestChannel使用EDMA3_DRV_HW_CHANNEL_EVENT_6通道报错

请问下,我需要外部的事件去触发传输,我把chId改成EDMA3_DRV_HW_CHANNEL_EVENT_6,申请通道就会返回EDMA3_DRV_E_DMA_CHANNEL_UNAVAIL错误,请问这是怎么回事。