基于qt的串口通讯程序在arm上只能发送数据不能接收
以下是主要程序部分,窗口也非常简单,只有一个发送窗口,一个接收窗口,一个发送按钮。该程序在电脑的linux系统下可以正常运行,能够实现发送和接收功能,但放到arm开发板上就只能发送不能接收了,请各位大侠指点!不胜感激! void serialport::sendButtonClicked(){ QString str = m_sendEdit->text(); ::write(m_fd,str.toLatin1(),str.length());}int serialport::openSerialPort(){ int fd = -1; const char *devName = "/dev/ttyS0"; fd = ::open(devName, O_RDWR | O_NONBLOCK); if (fd < 0) { return -1; } termios serialAttr; memset(&serialAttr, 0, sizeof serialAttr); serialAttr.c_iflag = IGNPAR; serialAttr.c_cflag = B115200 | HUPCL | CS8 | CREAD | CLOCAL; serialAttr.c_cc[VMIN] = 1; if (tcsetattr(fd, TCSANOW, &serialAttr) != 0) { return -1; } return fd;}void serialport::remoteDataIncoming(){ char c; if(read(m_fd,&c,sizeof c) !=1){ QMessageBox::warning(this,tr("Error"),tr("Receive error!")); return; } m_receiveEdit->insertPlainText(QString(QChar(c)));}