本人将DM8127 管脚（AE6 AF5）配置成uart4模式。当前发送可以，但是接收始终无法得到，uart1,2已经调试通。 datasheet中描述uart3,4,5支持高速模式。请问和这个有关系吗？除了配置mux复用为uart4，还有其他什么需要配置的？ 我是用的ipnc_rdk3.5
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