[英]How to write on serial port using Qextserialport
I am using Ubunt 10.10.我正在使用 Ubuntu 10.10。
I want to communicate with a microcontroller (ATmega328p) using serial through QT, so for testing I have created a dummy application on the microcontroller that reads character from the UART and responds on the serial port (replies) with the same character but in between brackets.我想通过 QT 使用串行与微控制器(ATmega328p)通信,因此为了测试,我在微控制器上创建了一个虚拟应用程序,它从 UART 读取字符并在串行端口(回复)上使用相同的字符但在括号之间进行响应.
If PC send: a, then PC receives reply [a]如果 PC 发送:a,则 PC 收到回复 [a]
The application is working great, when I am using hyper terminal (GtkTerm) to send the characters from PC, but when I use QT it does not work.该应用程序运行良好,当我使用超级终端(GtkTerm)从 PC 发送字符时,但是当我使用 QT 时它不起作用。 I am sending from QT a character on the serial port, and I am waiting to receive a reply on the hyper terminal, but I do not get any reply.我正在从 QT 在串口上发送一个字符,我正在等待超级终端上的回复,但我没有得到任何回复。
Serial Communication properties: Baud9600, Parity_none, Stop_bits_1, Data_8bits, Flow_control_Off串行通信属性:Baud9600、Parity_none、Stop_bits_1、Data_8bits、Flow_control_Off
#include <QtCore/QCoreApplication>
#include <qextserialport.h>
int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);
const char data[]= "e";
QextSerialPort * port = new QextSerialPort("/dev/ttyUSB0");
port->setBaudRate(BAUD9600);
port->setFlowControl(FLOW_OFF);
port->setParity(PAR_NONE);
port->setDataBits(DATA_8);
port->setStopBits(STOP_1);
port->setTimeout(0);
bool res = false;
res = port->open(QIODevice::ReadWrite | QIODevice::Unbuffered);
if(res)
{
qDebug("Opened");
qDebug(data);
int i = port->write(data, sizeof(data));
}
else
{
qDebug("Failed to connect");
}
return a.exec();
}
Any idea what is wrong?知道有什么问题吗?
It's not working because you open the serial port 2 times ( 1 time in Qt, and an other time with your HyperTerminal ).它不起作用,因为您打开串行端口 2 次(在 Qt 中打开了 1 次,在您的超级终端中打开了另一次)。
If you want get the reply of your command, you have to it on your Qt program.如果你想得到你的命令的回复,你必须在你的 Qt 程序上得到它。
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