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使用芯片：A40i-H 问题描述：linux下串口原生应该是不支持1.5位停止位的，查阅资料也没有可以设置1.5位停止位的方法，但是A40i芯片手册写了可以支持1.5位停止位，不知道是不是有别的设置方法
