serial.waitForReadyRead(1000)一直返回fals

在子线程Qthread中

run（）函数中，调用serial.waitForReadyRead(5000)一直超时返回false，但是确当串口是有数据发送过来的。调用serial->bytesAvailable()也会一直返回0

主要代码：

#include "masterthread.h" MasterThread::MasterThread(QObject *parent) : QThread(parent){ }   void MasterThread::run(){  QSerialPort serial;  serial.setPortName("COM4"); serial.setBaudRate(QSerialPort::Baud115200); serial.setDataBits(QSerialPort::Data8); serial.setParity(QSerialPort::NoParity); serial.setFlowControl(QSerialPort::NoFlowControl);  if (!serial.open(QIODevice::ReadWrite))

{ qDebug()<<"Open err"; }

  while (1) { serial.write("requestData..."); if (serial.waitForBytesWritten(1000))

{ qDebug()<<"waitForBytesWritten"; }

else { qDebug()<<"Write ok"; }   // read response if (serial.waitForReadyRead(1000)) { QByteArray responseData = serial.readAll(); while (serial.waitForReadyRead(10)) responseData += serial.readAll();  qDebug()<<responseData; } else { qDebug()<<"err\r\n"; } }}