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分类: 嵌入式
2018-05-09 17:22:46
对于开发板上的QT程序来说需要接收键盘的按键,本项目中使用的是自定义键盘。所以对于QT来说需要识别自定义键盘的上的按键。
大概流程图如下:
step-1:
在 qt-everywhere-opensource-src-4.6.3/src/gui/embedded 下增加如下两个文件
---------------------------------
qkbd_my_qws.h
+++++++++++++++++
#ifndef QKBD_MY_QWS_H
#define QKBD_MY_QWS_H
#include
QT_BEGIN_HEADER
QT_BEGIN_NAMESPACE
QT_MODULE(Gui)
#ifndef QT_NO_QWS_KEYBOARD
#ifndef QT_NO_QWS_KBD_MY
class QWSMYKbPrivate;
class QWSMYKeyboardHandler : public QWSKeyboardHandler
{
public:
QWSMYKeyboardHandler(const QString &);
virtual ~QWSMYKeyboardHandler();
private:
QWSMYKbPrivate *d;
};
#endif // QT_NO_QWS_KBD_MY
#endif // QT_NO_QWS_KEYBOARD
QT_END_NAMESPACE
QT_END_HEADER
#endif // QKBD_MY_QWS_H
---------------------------------
--------------------------------
qkbd_my_qws.cpp
++++++++++++++
#include "qkbd_my_qws.h"
#ifndef QT_NO_QWS_KBD_MY
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
QT_BEGIN_NAMESPACE
class QWSMYKbPrivate : public QObject
{
Q_OBJECT
public:
QWSMYKbPrivate(QWSMYKeyboardHandler *handler, const QString &device);
~QWSMYKbPrivate();
bool isOpen() { return buttonFD > 0; }
private Q_SLOTS:
void readKeyboardData();
private:
QWSMYKeyboardHandler *m_handler;
QString terminalName;
int buttonFD;
int kbdIdx;
int kbdBufferLen;
unsigned char *kbdBuffer;
QSocketNotifier *notifier;
};
QWSMYKeyboardHandler::QWSMYKeyboardHandler(const QString &device)
: QWSKeyboardHandler(device)
{
d = new QWSMYKbPrivate(this, device);
}
QWSMYKeyboardHandler::~QWSMYKeyboardHandler()
{
delete d;
}
QWSMYKbPrivate::QWSMYKbPrivate(QWSMYKeyboardHandler *h, const QString &device)
: m_handler(h)
{
terminalName = device.isEmpty()?"/dev/input/event1":device;//device.toLatin1();
buttonFD = -1;
notifier = 0;
if ((buttonFD = QT_OPEN(terminalName.toLatin1().constData(), O_RDONLY | O_NDELAY)) < 0)
{
qWarning("Cannot open %s\n", terminalName);//terminalName.toLatin1());
}
printf("Open MY usr keyboard success!!\n");
if ( buttonFD >= 0 )
{
notifier = new QSocketNotifier( buttonFD, QSocketNotifier::Read, this );
connect( notifier, SIGNAL(activated(int)),this,SLOT(readKeyboardData()) );
}
kbdBufferLen = 80;
kbdBuffer = new unsigned char [kbdBufferLen];
kbdIdx = 0;
}
QWSMYKbPrivate::~ QWSMYKbPrivate()
{
if ( buttonFD > 0 )
{
::close( buttonFD );
buttonFD = -1;
}
delete notifier;
notifier = 0;
delete [] kbdBuffer;;
}
void QWSMYKbPrivate::readKeyboardData()
{
struct input_event event;
// InputData ; //
int n = read(buttonFD, &event, sizeof(struct input_event));
if (n != sizeof(struct input_event))
{
printf("key pressed: n=%d\n", n);
return;
}
Qt::KeyboardModifiers modifiers = Qt::NoModifier;
int unicode = 0xffff;
int key_code = 0;
if(EV_KEY == event.type)
{
// 可以根据自己特定的硬件值来设定。
switch (event.code)
{
case 0x25:
key_code = Qt::Key_0;
unicode = 0xffff;
break;
case 0x6a:
key_code = Qt::Key_1;
unicode = 0xffff;
break;
case 0x1E:
key_code = Qt::Key_F1;
unicode = 0xffff;
break;
case 0x24:
key_code = Qt::Key_F2;
unicode = 0xffff;
break;
default:
qDebug("default : %d\n",event.code);
break;
}
m_handler->processKeyEvent(unicode, key_code, modifiers, event.value != 0, false);
}
if (EV_SYN == event.type)
printf ("syn event\n\n");
}
QT_END_NAMESPACE
#include "qkbd_my_qws.moc"
#endif // QT_NO_QWS_KBD_MY
--------------------------------
step-2 :
在qkbddriverfactory_qws.cpp文件中 :
#include "qkbd_my_qws.h"
.....
QWSKeyboardHandler *QKbdDriverFactory::create(const QString& key, const QString& device)
{
QString driver = key.toLower();
#ifndef QT_NO_QWS_KBD_MY
if (driver == QLatin1String("my") || driver.isEmpty())
{
printf("tsc keyboard");
return new QWSMYKeyboardHandler(device);
}
#endif
.......
}
....
QStringList QKbdDriverFactory::keys()
{
QStringList list;
#ifndef QT_NO_QWS_KBD_MY
list << QLatin1String("my");
#endif
...........
}
step-3 :
修改qt-everywhere-opensource-src-4.6.3/目录下的 configure
做如下修改
CFG_KBD_AVAILABLE="my tty linuxinput qvfb"
CFG_KBD_ON="my" #default, see QMakeVar above------ 原来是tty
#QMakeVar add kbd-drivers "tty"---原来的
QMakeVar add kbd-drivers "my
重新configure ,增加 -qt-kbd-my选项
step-4:
进入 qt-everywhere-opensource-src-4.6.3/src/gui/embedded
在这个目录下 make -f Makefile
make install
step-5:
然后把编译出来的 libQtGui* 库文件拷贝到开发板的文件系统的库文件路径下(/usr/lib)
cp ~/Qt/output/qt-arm/lib/libQtGui* ~/targetfs/usr/lib/
完成~~~~~