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怎么例程的usart程序下在launch pad + G2553里P1.2脚只有高电平,根本没有脉冲~

有人说是连接串口 需要 将  2个跳线帽竖放,设为HW UART模式是哪两个跳线帽?请高人指点~~

x 出现错误。请重试或与管理员联系。