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您好,C6678开发板,运行keystone自带的UART程序,通过串口调试助手发送数据,每次只能最多发送30个字节,超过三十剩余的接收不到

UART 的 receive trigger word是14个字节,如题,串口调试助手发送30个字节,第一次是在满14个字节产生中断,第二次是在16字节,这是为什么?还有每次发送超过30个字节,只有前30个字节收到,谢谢