基于Qt4.7的ADC测试程序

所使用的开发板：友善之臂tiny6140

widget.h

#ifndef WIDGET_H
#define WIDGET_H

#include 
#include 


namespace Ui {
    class Widget;
}

class TMainForm : public QWidget
{
    Q_OBJECT

public:
    TMainForm(QWidget * parent = 0, const char * name = 0, Qt::WFlags f = 0);
    virtual ~TMainForm() {}
protected:
    void timerEvent (QTimerEvent *);
private:
    QLCDNumber* m_label;
    Ui::Widget *ui;
};

#endif // WIDGET_H

widget.cpp

#include "widget.h"
#include "ui_widget.h"

#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 


TMainForm::TMainForm(QWidget *parent, const char *name, Qt::WFlags f)
{
    //setCaption( "ADC-Testing" );
    m_label = new QLCDNumber(this);
    m_label->setGeometry(10,10, 100, 50);
    m_label->setSegmentStyle(QLCDNumber::Flat);
    startTimer(500);
}

void TMainForm::timerEvent ( QTimerEvent * )
{
    int fd = ::open("/dev/adc", 0);
    if (fd < 0)
    {
        return;
    }
    char buffer[30] = "";
    int len = ::read(fd, buffer,
    sizeof buffer -1);
    if(len > 0)
    {
    buffer[len] ='\0';
    int value=-1
                                                                        
    sscanf(buffer,"%d",&value);
    m_label->display(value);
   }
    ::close(fd);

}

main.cpp

#include

#include "widget.h"

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    TMainForm w;
    w.show();

    return a.exec();
}

亲测可用，如有疑惑，可留言。