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请教问题:28377s launchpad开发板,用controlsuit 中的sci_echoback例程与电脑串口通信显示为乱码,并且数据位也对不上去

sci_echoback例程中的SCI配置未改,版本v140,我只是将原来的GPIO28,29端口改为开发板自带的GPIO84,85端口,还是SCIA,

GPIO_SetupPinMux(85, GPIO_MUX_CPU1, 5);
GPIO_SetupPinOptions(85, GPIO_INPUT, GPIO_ASYNC);
GPIO_SetupPinMux(84, GPIO_MUX_CPU1, 5);
GPIO_SetupPinOptions(84, GPIO_OUTPUT, GPIO_ASYNC);

通过串口调试助手显示的为乱码,我单独给 SciaRegs.SCITXBUF.all内写1,调试界面显示为06 00,写2的话显示为18 00,写0xff 显示FE,只有写00显示00,配置了好几遍也不对,请问问题出在哪里,求赐教。