[beagleboard] BBB ADC automatically Stopping 1007 sample after.

[Desperado]

Hi friends,

I read BBB adc value in QT. but read Stopping 1007 sample after. my QT 
codes below; I do not solve the problem.
please help me.




MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    i =0;
    timer = new QTimer(this);
                 connect(timer, SIGNAL(timeout()), this, 
SLOT(Read_Analog_Digital_Data()));
                 timer->start(500);

}



void MainWindow::Read_Analog_Digital_Data()
{

    try

    {

        const char AIN_DEV[] = 
"/sys/bus/iio/devices/iio:device0/in_voltage0_raw";
        int fd= open(AIN_DEV, O_RDONLY);
        char AIN0[5] = {0};
        int len8= read(fd, AIN0, sizeof AIN0 -1);
        AIN0[len8]='\0';
        ui->label_9->setText(AIN0);


    if(len8>0)
    {
    ui->P9_42->setText(QString::number(i++));
    }

}

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