readfilewindow.cpp

这个是我在linux下用qt写的数字存储示波器的界面程序

/*****************************************************************************************************************
******************************************************************************************************************

opyRight C 2006 SEU
FlieName:       readfile.cpp
Descreption:    aheader of myproject1
Others:
Version:        0.01
Author:         jack
Date:           2007/04/09
History 1:      no
Date:
Version:
Author:
Modified:
******************************************************************************************************************
*****************************************************************************************************************/

#include <qapplication.h>
#include <qfile.h>
#include <qstring.h>
#include <qtextstream.h>
#include <qmultilineedit.h>
#include <qframe.h>
#include <qtimer.h>
#include <qpainter.h>
#include <qpushbutton.h>

#include "readfilewindow.h"
#include <stdio.h>
#include <math.h>
#include <stdlib.h>
#include <sys/ioctl.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/mman.h>
//#define DEVICE  "/usr/local/arm/mydrives/lllllll/drawcurve/tridata.txt"
#define DEVICE  "/dev/phyaddrtest"

      const double pi = 3.14159;
      unsigned int read_val[200];
//      unsigned int val[200];
/*for ( int i = 0; i<200; i++ )
    {
        val[i] = ( int ) ( sin((pi*i)/100)*100*360/200 + 180 );//store sin wave map to 0--160
    }      
unsigned int val[200]={0x83,0x19,0x6A,0x6B,77,90,88,44,22,33,
                               123,31,32,55,36,75,43,123,44,89,
                               98,13,69,56,66,59,31,34,36,79,
                               85,55,28,77,1,14,58,0,71,34,
                               23,13,56,78,71,52,63,2,59,18,
                               73,51,52,61,97,55,69,45,28,71,
                               58,69,28,39,27,29,14,18,19,45,
                               42,75,91,59,85,10,20,45,62,99,
                               45,89,17,46,13,79,93,52,41,88,
                               85,97,59,58,54,29,12,18,22,55,//2nd cycle;
                               0x83,0x39,0x6A,0x6B,77,90,88,44,20,33,
                               13,34,32,55,36,65,42,13,44,89,
                               98,23,39,36,66,59,31,24,46,79,
                               85,55,48,77,1,14,58,0,75,14,
                               23,12,46,78,71,82,93,2,19,18,
                               73,91,82,71,97,55,29,45,18,71,
                               38,39,28,39,27,29,14,18,19,45,
                               42,73,91,59,75,21,60,45,62,99,
                               45,89,18,46,13,79,93,52,71,88,
                               85,97,59,58,74,29,12,15,22,55};*/
readfileWindow :: readfileWindow( QWidget *parent, const char *name, WFlags f )
          : QWidget( parent, name, f )
{
    if ( !name )
    setName( "readdata" );
    setGeometry( 10, 10, 300, 230 );
/*    medit = new QMultiLineEdit( this );
      medit->setGeometry( 10, 10, 260, 180 );
      medit->setReadOnly( TRUE );
    
      myfile = new QFile( "/dev/phyaddrtest");
*/
    frame1 = new QFrame( this, "frame1" );
    frame1->setBackgroundColor( black );
    frame1->setGeometry( QRect( 10, 10, 200, 200 ) );  

    timer = new QTimer( this, "flushtimer" );
    connect( timer, SIGNAL( timeout() ), this, SLOT( flushBuff() ) );
    timer->start( 50 );
    
    btn = new QPushButton( "close",this, "btnclose");
    btn->setGeometry( 250, 200, 40, 20 );
    connect( btn, SIGNAL( clicked( ) ), qApp, SLOT( quit( ) ) );

     if((fd = open(DEVICE,O_RDWR | O_NONBLOCK))<0)
        {
                qWarning("can not open device");
                return;
        }

        qWarning("open device: %s\n",DEVICE);
        valinit( );
        writedata( );
        readdata( ); 
}
void readfileWindow :: valinit()
{
for ( int i = 0; i<200; i++ )
    {
        val[i] = ( int ) ( sin((pi*i)/100)*100*360/200 + 180 );//store sin wave map to 0--160
    }      
        //return ;    
}
readfileWindow :: ~readfileWindow()
{
    close( fd );
}

int readfileWindow :: readdata( )
{
        printf("begin to read:\n");
        ret = read(fd,read_val,800 );
        printf("ret=%d\n", ret );
        for( i = 0; i < 200; i++ )
        {
            printf("read1=%d\n",read_val[i]);//*(read_val+i)&0xffffffff );
            //buff[i] = read_val[i]; // modify at 20070512
        }
        return 0;
}

void readfileWindow :: writedata( )
{

        ret=write(fd,val,800);
        printf("ret=%d\n", ret );
        if (ret!=800)
        printf("write error\n");
        else
        printf("write data ok\n");
        for (i=0;i<200;i++)
        {
            printf("val=%x\n",*(val+i));
        }
}

void readfileWindow :: paintEvent( QPaintEvent * )
{
    frame1->erase( 0, 0, 200, 200 );
    QPainter painter1( frame1 );
    QPoint beginPoint;
    QPoint endPoint;
    painter1.setPen( QPen( yellow, 1, SolidLine ) );
    painter1.drawLine( 0, 100, 200, 100 ); // a line at 20070512
    for ( int i = 0; i <200-1; i++)
    {
        beginPoint.setX( i );
        beginPoint.setY(read_val[i]);
        endPoint.setX( i + 1 );
        endPoint.setY( read_val[i + 1]);
        painter1.drawLine( beginPoint, endPoint );
    }
}

/*void readfileWindow :: flushBuff( )
{
    int tmp = buff[0];
    for (int i = 0; i<199; i++ )
    {
        buff[i] = buff[i + 1];
    }
    buff[199] = tmp;
    repaint( 0, 0, 640, 480, TRUE );
}
*/
void readfileWindow :: flushBuff( )
{
    int tmp = read_val[0];
    for (int i = 0; i<199; i++ )
    {
        read_val[i] = read_val[i + 1];
    }
    read_val[199] = tmp;
    repaint( 0, 0, 320, 240, TRUE );
}