我为我的Raspberry Pi买了一台Tontec 2.4英寸触摸屏(http://elinux.org/MZTX-PI-EXT)。触摸屏控制器需要" tsc2007.ko"和" tsp_raspi.ko"内核模块,如elinux帖子中所述。 tsc2007.ko模块位于Raspbian内核树中,但可以在此处找到tsp_raspi.ko:https://github.com/osandov/raspi/tree/master/tsc2007。
我已经为这些模块交叉编译了一个新的内核,并且它们加载正常并在Raspbian中创建/ dev / input / event0设备。如果我'evtest'那个设备和触摸屏幕,我得到输出,所以我知道事件是在Linux中提供的:
pi@raspberry /dev/input $ evtest
Available devices:
/dev/input/event0: TSC2007 Touchscreen
Select the device event number [0-0]: 0
Input driver version is 1.0.1
Input device ID: bus 0x18 vendor 0x0 product 0x0 version 0x0
Input device name: "TSC2007 Touchscreen"
Supported events:
Event type 0 (EV_SYN)
Event type 1 (EV_KEY)
Event code 330 (BTN_TOUCH)
Event type 3 (EV_ABS)
Event code 0 (ABS_X)
Value 1922
Min 0
Max 4095
Fuzz 64
Event code 1 (ABS_Y)
Value 2221
Min 0
Max 4095
Fuzz 64
Event code 24 (ABS_PRESSURE)
Value 0
Min 0
Max 4095
Fuzz 64
Properties:
Testing ... (interrupt to exit)
Event: time 1425521704.199489, type 1 (EV_KEY), code 330 (BTN_TOUCH), value 1
Event: time 1425521704.199489, type 3 (EV_ABS), code 1 (ABS_Y), value 2085
Event: time 1425521704.199489, type 3 (EV_ABS), code 24 (ABS_PRESSURE), value 538
Event: time 1425521704.199489, -------------- SYN_REPORT ------------
Event: time 1425521704.209174, type 3 (EV_ABS), code 0 (ABS_X), value 1455
...
我安装了tslib并运行了一个快速的ts_calibrate。当我触摸屏幕时,我还确保ts_test吐出数据。
我在Qt5中为tslib支持的/ etc / profile添加了以下环境变量:
## For Qt5 Touchscreen Support
export QT_DEBUG_PLUGINS=1
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/lib/arm-linux-gnueabihf/
export QT_PLUGIN_PATH=/usr/lib/plugins
export QT_QPA_FONTDIR=/usr/lib/fonts
export QT_QPA_PLATFORM_PLUGIN_PATH=/usr/lib/plugins/platforms
export QT_QPA_PLATFORM=linuxfb
export QT_QPA_GENERIC_PLUGINS=tslib:/dev/input/event0
export QT_QPA_EVDEV_TOUCHSCREEN_PARAMETERS=/dev/input/event0
export TSLIB_TSEVENTTYPE='INPUT'
export TSLIB_CALIBFILE='/etc/pointercal'
export TSLIB_CONFFILE='/etc/ts.conf'
export TSLIB_CONSOLEDEVICE='none'
export TSLIB_FBDEVICE='/dev/fb0'
export TSLIB_PLUGINDIR='/usr/lib/ts'
export TSLIB_TSDEVICE='/dev/input/event0'
我阅读了Qt5文档以及如何在我的应用中获取触摸事件。我有一个主Widget并在构造函数中设置适当的标志:
MainWidget::MainWidget(QLabel *parent)
: QLabel(parent)
{
qDebug() << "Setting WA_AcceptTouchEvents on MainWidget...";
// Accept touch events
setAttribute(Qt::WA_AcceptTouchEvents);
setAttribute(Qt::WA_StaticContents);
}
我设置了一个事件过滤器来尝试捕捉触摸事件:
bool MainWidget::eventFilter( QObject* target, QEvent* e )
{
qDebug() << "Event Type: " << e->type();
return false;
return QLabel::eventFilter(target, e);
}
我像这样启动我的应用程序:
myapp -platform linuxfb:fb = / dev / fb0 -plugin tslib:/ dev / input / event0
我还在Qt的qtslib.cpp源代码中取消注释了一个printf:
void QTsLibMouseHandler::readMouseData()
{
ts_sample sample;
while (get_sample(m_dev, &sample, m_rawMode)) {
bool pressed = sample.pressure;
int x = sample.x;
int y = sample.y;
// work around missing coordinates on mouse release
if (sample.pressure == 0 && sample.x == 0 && sample.y == 0) {
x = m_x;
y = m_y;
}
if (!m_rawMode) {
//filtering: ignore movements of 2 pixels or less
int dx = x - m_x;
int dy = y - m_y;
if (dx*dx <= 4 && dy*dy <= 4 && pressed == m_pressed)
continue;
}
QPoint pos(x, y);
//printf("handleMouseEvent %d %d %d %ld\n", m_x, m_y, pressed, sample.tv.tv_usec);
QWindowSystemInterface::handleMouseEvent(0, pos, pos, pressed ? Qt::LeftButton : Qt::NoButton);
m_x = x;
m_y = y;
m_pressed = pressed;
}
}
当我启动我的Qt应用程序时,我看到插件正在加载正常(甚至显示正确的event0文件)。我还看到qt tslib插件在我触摸屏幕时正在接收触摸事件。问题是事件过滤器永远不会被调用!
以下是推出的应用:
Got keys from plugin meta data ("tslib", "tslibraw")
QFactoryLoader::QFactoryLoader() checking directory path "/home/pi/generic" ...
loaded library "/usr/lib/qt/plugins/generic/libqtslibplugin.so"
QTsLibMouseHandler "tslib" ""
QTsLibMouseHandler "tslib" "/dev/input/event0"
QFactoryLoader::QFactoryLoader() checking directory path "/usr/lib/qt/plugins/styles" ...
QFactoryLoader::QFactoryLoader() checking directory path "/home/pi/styles" ...
Setting WA_AcceptTouchEvents on MainWidget...
-----------------------------------------
Waiting for data now...
-----------------------------------------
handleMouseEvent 0 0 1 751196
handleMouseEvent 0 0 1 751196
handleMouseEvent 1696 1615 1 771075
handleMouseEvent 1696 1615 1 771075
handleMouseEvent 1679 1622 1 781368
handleMouseEvent 1671 1638 1 781368
handleMouseEvent 1679 1622 1 781368
handleMouseEvent 1671 1638 1 781368
...
我发现了一些论坛帖子,人们在使用linuxfb平台插件时遇到触摸输入问题:
我已经尝试了所有他们的建议但仍然遇到问题 - 我的应用没有收到任何触摸事件,即使Qt tslib插件说它正在接收它们。
似乎tslib插件在将其收到的事件注入到我的应用程序的事件循环中时出现问题:
QWindowSystemInterface::handleMouseEvent(0, pos, pos, pressed ? Qt::LeftButton : Qt::NoButton);
我也尝试过Qt5.4触摸手指画示例并看到相同的行为 - 没有收到任何触摸事件。
我不知道从哪里开始。我非常感谢任何帮助解决这个问题。谢谢!
更新:
我更改了事件过滤器,所以看起来像这样:
bool MainWidget::eventFilter(QObject *obj, QEvent *event)
{
qDebug() << "Event received" << obj->metaObject()->className() << event->type();
switch (event->type()) {
case QEvent::TouchBegin:
qDebug() << "TouchBegin";
case QEvent::TouchUpdate:
qDebug() << "TouchUpdate";
case QEvent::TouchEnd:
qDebug() << "TouchEnd";
{
// QTouchEvent *touch = static_cast<QTouchEvent *>(event);
// QList<QTouchEvent::TouchPoint> touchPoints = static_cast<QTouchEvent *>(event)->touchPoints();
// foreach (const QTouchEvent::TouchPoint &touchPoint, touchPoints) {
// switch (touchPoint.state()) {
// case Qt::TouchPointStationary:
// // don't do anything if this touch point hasn't moved
// continue;
// default:
// {
// }
// break;
// }
// }
// break;
}
//default:
//return QLabel::event(event);
}
//return true;
}
现在我可以看到&#39;套接字通知器&#39;每当我触摸屏幕时,事件就与Qt Tslib Plugin的打印混合在一起。关于为什么事件类型50但没有触摸事件的任何想法?
Event received QSocketNotifier 50
handleMouseEvent 2702 2618 0 557715
Event received QSocketNotifier 50
handleMouseEvent 2698 2612 1 547758
Event received QSocketNotifier 50
handleMouseEvent 2706 2802 1 759928
Event received QSocketNotifier 50
Event received QSocketNotifier 50
更新#2:
我只安装了事件过滤器以尝试捕获任何事件。我在Qt5中不确定将事件类型50(QSocketNotifier)转换为QTouch *或QMouse *事件。
以下是一些更多信息:
答案 0 :(得分:0)
通过确保在RasbperryPi上安装tslib插件来解决问题。
TSLIB_PLUGINDIR=/usr/lib/ts
Pi上没有目录/ usr / lib / ts。