Hello!

I'm trying to use the static QTimer::singleShot() function to create delay between write and read cycles via serial interface.

I have done the following code:

Hedaer:
Qt Code: 
  1. #ifndef CAN_TRANSFER_H
  2. #define CAN_TRANSFER_H
  3.  
  4. #include <QMainWindow>
  5. #include "qextserialport.h"
  6. #include <Qtimer.h>
  7.  
  8.  
  9. namespace Ui {
  10.     class CAN_transfer;
  11.  
  12. }
  13.  
  14. class CAN_transfer : public QMainWindow {
  15.     Q_OBJECT
  16.  
  17. public:
  18.     CAN_transfer(QWidget *parent = 0);
  19.     ~CAN_transfer();
  20.  
  21.  
  22. protected:
  23.     void changeEvent(QEvent *e);
  24.  
  25. private:
  26.     Ui::CAN_transfer *ui;
  27.     QextSerialPort*  _comPort; 
  28.     unsigned char mas[64];
  29.     unsigned char* DATA_pointer;
  30.  
  31. private slots:
  32.  
  33.     void readBR(unsigned char t);
  34.     void on_store_all_button_clicked();
  35.     void on_store_sel_button_clicked();
  36.     void on_connectbutton_clicked();
  37.     void timer_event();
  38. };
  39.  
  40. #endif // CAN_TRANSFER_H
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Source:

Qt Code: 
  1. #include "can_transfer.h"
  2. #include "ui_can_transfer.h"
  3. #include "qextserialport.h"
  4. #include "win_qextserialport.h"
  5. //#include <Qtimer.h>
  6. #include <QTimer>
  7. unsigned char clkdt,te;
  8. CAN_transfer::CAN_transfer(QWidget *parent) :
  9.     QMainWindow(parent),
  10.     ui(new Ui::CAN_transfer)
  11. {
  12.     ui->setupUi(this);
  13.     ui->logw->setReadOnly(true);
  14.     ui->logw->setFontWeight(QFont::Bold);
  15.     ui->logw->append(tr("CAN transfer configurator is ready to use!"));
  16.     ui->logw->setFontWeight(QFont::QFont::Normal);
  17.     ui->logw->setTextColor(Qt::black);
  18.     QString s="COM1";
  19.     _comPort  = new QextSerialPort(s);
  20.     _comPort->setBaudRate(BAUD9600);
  21.     _comPort->setFlowControl(FLOW_OFF);
  22.     _comPort->setParity(PAR_NONE);
  23.     _comPort->setDataBits(DATA_8);
  24.     _comPort->setStopBits(STOP_1);
  25.     DATA_pointer = &mas[0];
  26.     clkdt = 0;
  27. }
  28.  
  29. CAN_transfer::~CAN_transfer()
  30. {
  31.     _comPort->close();
  32.     delete(_comPort);
  33.     delete ui;
  34. }
  35.  
  36. void CAN_transfer::changeEvent(QEvent *e)
  37. {
  38.     QMainWindow::changeEvent(e);
  39.     switch (e->type()) {
  40.     case QEvent::LanguageChange:
  41.         ui->retranslateUi(this);
  42.         break;
  43.     default:
  44.         break;
  45.     }
  46. }
  47.  
  48.  
  49. void CAN_transfer :: timer_event()
  50. {
  51.     te = 0;
  52.     timer->stop();
  53. }
  54. void CAN_transfer::on_connectbutton_clicked()
  55. {unsigned char rb=0;
  56.     ui->logw->append(tr("COM1 configurating...."));
  57.      _comPort->open(QIODevice::ReadWrite | QIODevice::Unbuffered);
  58.     ui->logw->append(tr("conneting...."));
  59.     *DATA_pointer = 0x55;
  60.     if(_comPort->write((const char*)DATA_pointer, 1))
  61.     {
  62.  
  63.         te = 1;
  64.         QTimer :: singleShot(100, this, SLOT(timer_event()));
  65.         while(te);
  66.         rb = _comPort->bytesAvailable();
  67.         if(rb)
  68.         {
  69.             _comPort->read((char*)DATA_pointer,rb);
  70.             if(*DATA_pointer==0xAA)
  71.             ui->logw->append(tr("connection established!"));
  72.         }
  73.         else
  74.         {
  75.             ui->logw->append(tr("no connection"));
  76.         }
  77.  
  78.     }
  79.  
  80.     statusBar()->showMessage(tr("Connected"));
  81.     //_comPort->close();
  82. }
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The problem is in that what application do not affect the SLOT(event_timer) code, at least it seems to be.

Compiler don not issue any warning or errors and I casue of that I don't understand in what the problem is.

I need some help to solve this problem, I would glad of any information about it.


Thanks in advance