itop4412开发板Qt串口编程

1、itop4412开发板qt串口编程/*打开按钮*/void example:n_opencb_clicked()qserialport:baudrate baurate; /波特率qserialport:atabits databits; /数据位qserialport:stopbits stopbits; /停止位qserialport:arity checkbits; /校验位/设置波特率if (ui->baudcb->currenttext() = "4800" ) baurate = qserialport:baud4800; else if(ui-&g

2、t;baudcb->currenttext() = "9600" ) baurate = qserialport:baud9600; else if(ui->baudcb->currenttext() = "115200") baurate = qserialport:baud115200;/设置数据位if (ui->datacb->currenttext() = "5") databits = qserialport:ata5;else if(ui->datacb->currenttext(

3、) = "6") databits = qserialport:ata6;else if(ui->datacb->currenttext() = "7") databits = qserialport:ata7;else if(ui->datacb->currenttext() = "8") databits = qserialport:ata8;/设置停止位if (ui->stopcb->currenttext() = "1" ) stopbits = qserialport:

4、onestop; else if(ui->stopcb->currenttext() = "1.5" ) stopbits = qserialport:oneandhalfstop; else if(ui->stopcb->currenttext() = "2" ) stopbits = qserialport:twostop; /设置校验位if(ui->checkcb->currenttext() = "none" ) checkbits = qserialport:noparity; /填充串口

5、对象的属性值serialport->setportname(ui->serialcb->currenttext();serialport->setbaudrate(baurate);serialport->setdatabits(databits);serialport->setstopbits(stopbits);serialport->setparity(checkbits);/设置好属性后打开串口if(serialport->open(qiodevice:readwrite) = true)qmessagebox:information(t

6、his,"提醒","胜利");elseqmessagebox:critical(this,"提醒","失败");4.收发串口数据功能读数据：每当数据流从串口到达系统一次，就会传到 qt 应用程序一次，readyread 信号就会触 发 一次，所以可以用前面章节讲的信号和槽机制将 readyread 信号和槽函数绑定，然后就可以在槽函数中读取串口数据。槽函数中用法 readall()读取数据，用法带换行功能的 appendplaintext（）显示到 ui 的接收窗口。/类中声明槽函数private slots:vo

7、id serialportreadyread_solt(void);/readyread 信号和槽函数绑定connect(serialport,signal(readyread(),this,slot(serialportreadyread_solt();/读串口void example:serialportreadyread_solt(void)qstring buf;buf = qstring(serilaport->readall();ui->recvedit->appendplaintext(buf);写数据：猎取 ui 界面填写的信息，ui->sendedit->text()，用法 qserialport 的成员函数 write 将数据写到串口。void widget:n_sendbt_clicked()serilaport->write(ui->sendedit->text().tolocal8bit().data();5.关闭串口功能用法 qserialport 的成员函数 close()关闭串口。void widget:n_closebt_clicked()serilaport->close();