我用CDC生成的代码已经实现PCB电容触控功能，但在接入UART串口时，不论发送什么数据，串口调试助手总是显示FF，所以想求助大家，有没有碰到这种情况，什么原因造成的？我目前对程序的UART串口初始化，时钟选择及分频等有疑惑，怀疑是波特率配置出错，程序也没看到SMCLK具体值以及最终的波特率是多少
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