How to write on serial port using Qextserialport
It's not working because you open the serial port 2 times ( 1 time in Qt , and an other time with your HyperTerminal ).
If you want get the reply of your command, you have to it on your Qt program.
Can't declare serial port using qextserialport
The error message is generated by linker. It means that it cannot find QextSerialPort
library binaries.
According to QextSerialPort Manual QextSerailPort
in Qt4 can be used only in Compat Mode:
Can be used as static or shared library, or simply integrate the
component into application.
The simplest solution is just to build QextSerailPort
together with your main project. Just include it to your project file (.pro
):
include(pathToQesp/compat/qextserialport.pri)
You do not need QT += extserialport
, since in the Compat Mode it is not used as a Qt module.
The simplest HowTo
- create a new folder; go to it:
mkdir test && cd test
git clone https://github.com/qextserialport/qextserialport
- create a new Qt project in this folder, for example with name
extserialtest
, so you have two folders:qextserialport
withQextSerailPort
packageextserialtest
with your Qt project
- add the line
include (../qextserialport/src/qextserialport.pri)
intoextserialtest.pro
- write your project code:
#include <qextserialport.h>
andnew QextSerialPort("/dev/ttyACM0");
Verified on Qt 4.8.3 in Linux that it works out of the box.
Qt QextSerialPort static lib
Thanks Nejat for your response. Very clear.
Also, for those following in my footsteps, it was a case of read-the-manual for me. The answer is in:
https://code.google.com/p/qextserialport/wiki/QextSerialPort_1_2_RC
It plainly says to add
CONFIG += qesp_static
to the .pro file. This works too.
Why the Qt(4.8) serial port(qextserialport) readind data from device in 2 part?
It depends on serial port driver buffer. You can got readyRead()
signal on one ready byte, for example.
You should save received bytes to intermediate buffer and process it after all.
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