使用Qt的串行端口的扩展行为 [英] extrange behavior of serial port using Qt

问题描述

我正在使用QT执行一个应用程序，以通过rs-232与8位微控制器进行PC通信.我正在使用QtSerialPort库，并且通讯正常，但是每次我从PC向微型计算机写东西并且收到响应时，我都必须关闭并打开串行端口，否则我将无法继续通讯.配置为:10500 bps，8位，1个停止，无奇偶校验，无流量控制.

I am performing an app with QT for communicate my PC with an 8 bits microcontroller through rs-232. I am using the QtSerialPort library and the communication is working fine, but each time I write something from the PC to the micro and I receive the response, I have to close and open the serial port or I can't continue communicating.. My configuration is: 10500 bps, 8 bits, 1 stop, no parity, no flow control.

下一个用于配置和端口的演讲/写作的代码:

The code used for the configuration and the lecture/writting of the port is the next:

bool DriverS::configure(int port, int baudRate)
{
    if(port!=22)
        return false;

     serialPort->setPortName("COM22");

 if (serialPort->open(QIODevice::ReadWrite)==true){

        if (!serialPort->setBaudRate(baudRate)) {
            return false ;
        }

        if (!serialPort->setDataBits(QSerialPort::Data8)) {
            return false ;
        }

        if (!serialPort->setParity(QSerialPort::NoParity)) {
            return false;
        }

        if (!serialPort->setStopBits(QSerialPort::OneStop)) {
            return false;
        }

        if (!serialPort->setFlowControl(QSerialPort::NoFlowControl)){
            return false;
            }
    };

    return true;
}



bool DriverS::read(QByteArray & rxData, int * size)
{

    Sleep(200); 
    *size = 0;
    if (serialPort->waitForReadyRead(TIMEOUT_SERIAL)) {
        rxData = serialPort->readAll();
        *size = rxData.size() ;

    if (!this->checkCRC(rxData))
        {
            qDebug()<< "Rx Checksum Error";
            return false;
        }

    return true;
    }
    qDebug()<< "Rx Timeout";
    return false;
}

bool DriverS::write(QByteArray txData)
{

    unsigned int chk = 0;
    int ret ;

    for(int i = 0;i<txData.size();i++)
    {
        chk+=txData.at(i);
    }

    txData.append(chk);
    ret = serialPort->write(txData);
    return (txData.size()==ret);

}

推荐答案

我解决了两个问题(尽管我不确定这些方法).

I fixed my two problems (despite I am not sure about the methods).

对于第1个问题(每次我想进行通信时都要打开和关闭端口)，我只是在我的write方法中添加了一个waitFoBytesWritten().

For problem num 1 (open and close the port each time I wanted to communicate) I just added a waitFoBytesWritten() in my write method.

对于问题2(我只能使用port22)，我已经修改了配置，现在我首先检测到availablePorts()可用的端口，而不是强制使用我要使用的端口.现在，我可以将设备连接到任何可用端口，并且可以使用.

For my problem num 2, (I only was able to work with port22), I have modified the configuration and now I first detect wich ports are available with availablePorts() instead to force the port I want to use. Now I can connect my device to any free port and it works..

这篇关于使用Qt的串行端口的扩展行为的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！