开发板环境:Linux mcuzone 4.1.0-linux4sam_5.3 #154 Fri Nov 25 18:27:57 CST 2016 armv7l GNU/Linux
由于项目需要,Qt程序需要实时显示从CAN口传来的数据。若把采集数据代码放到MainWindow的Gui线程中,屏幕会假死(qApp->processEvent效果不好),所以开启线程采集数据。第一次开机启动Qt程序时,点击Button弹出Dialog的时,界面会发生抖动(闪屏)界面会黑屏,此时,GUI线程能正常工作(每秒打印一句话),数据子线程也正常工作(能打印),若杀死该程序并重新启动后,闪屏黑屏现象消失,程序能一直正常工作。
若将 thread->start(); 屏蔽,即关闭子线程。则第一次开启只会闪屏,并不会黑屏(%99不黑屏)!
若将子线程中的数据部分全部去掉,第一次开启还是有可能会黑屏的!
关键代码:
MainWindow.cpp
thread = new Thread;
connect(thread,SIGNAL(DISPLAY_DZ_DATA()),this,SLOT(DISPLAY_DZ_DATAMain()));
thread->start();
/***/
thread.h
class Thread : public QThread
{
Q_OBJECT
public:
Thread();
~Thread();
void stop();
protected:
void run();
private:
QMutex mutex;
volatile bool stopped;
uint32_t dlen;
signals:
void DISPLAY_DZ_DATA();
};
/*****/
thread.cpp
Thread::~Thread()
{
}
void Thread::run()
{
int jishuqi = 0;
#if 1
can = 1;
s = PanelSocketCanOpen(can);
#endif
while(threadisrun == 0)
{
mutex.lock();
printf("jishuqi:%d\n",jishuqi);
jishuqi++;
dlen = PanelCanRecvData(s,bufferOriginal,sizeof(bufferOriginal)); //从CAN口接收数据
// printf("PanelCanRecvData have got,dlen = %d\n",dlen);
uint8_t *OriginalPoint; //指针,指向数组
uint8_t bufType;
int8_t bufState;
bufType = bufferOriginal[0];
bufState = bufferOriginal[1];
OriginalPoint = &bufferOriginal[2];
if(ParamInfo._packTyp == COMMAND_CODE_DZ_GET){
if (ParamInfo._devId == 6 || ParamInfo._devId == 7 || ParamInfo._devId == 8){
// emit DISPLAY_DZ_DATA();
for (int i = 0; i<TRUE_YCDZ_DOT; ++i){
// printf("1_ParamInfo._paramDatas[%d] = %02X\n",i,ParamInfo._paramDatas);
}
}
}
......更多工作代码......
mutex.unlock();
msleep(200);//不加这句CPU占用率高达50%
}
}