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tms570ls3137 HDK开发板使用SCI/LIN串口发送数据不正确

在使用SCI/LIN模块的SCI进行串口数据输出时,发现LINTX管脚发送一次8bit数据后就总是低电平(空闲时),但管脚在初始化时是配置的拉高,请各位高手赐教,谢谢。注:程序使用的是光盘里提供的串口通信的的例程。