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28377串口发送问题

最近在做一个项目,使用28377S串口Scid的时候,遇到接收dsp发送的数据时会多收一个字节的问题。具体现象是:发送完成整帧报文后,tx管脚会被莫名的拉低几十us后,再被拉高。对于高速率通信时,几十us是要命的,不知道有没有遇到同样问题的,怎么解决的。麻烦各位大神帮忙。