Updating ac value for Qtimer - qt

Question

I am using qt tool for mini2440.
I make a gui for i2c adc having starti2c and stopi2c.
All things are working well: it reads value of signal when starti2c button press, but I want this value to be updated. I know that Qtimer can be used, but how can I do it?
Here is the code:
# include <termio.h>
# include <time.h>
# include <string.h>
# include <sys/time.h>
HelloForm::HelloForm(QWidget* parent, const char* name, WFlags fl):
HelloBaseForm(parent, name, fl)
{
connect(PushButton1,SIGNAL(clicked()),this,SLOT(starti2c()));
connect(PushButton2,SIGNAL(clicked()),this,SLOT(stopi2c()));
}
HelloForm::~HelloForm()
{
}
//*********************Code for getting i2c**************************//
char HelloForm::geti2c()
{
char buf[100];
char buff[100];
char valuee;
int m1;
char con_buff[10];
int fd=open("/dev/i2c/0",O_RDWR);
if (fd<0)
{
Message->setText(" NOT ABLE TO OPEN THE DRIVER ");
}
else
{
Message->setText(" I2C IS WORKING ");
}
int io,wbyte,rbyte,i;
//********i2cdetect and read************
buf[0]=0x48;
buf[1]=0x00;
buf[2]=0x91;
io=ioctl(fd,I2C_SLAVE,0x48);
if(io<0)
{
Message->setText(" ");
Message->setText("error ioctl");
}
else
{
wbyte=write(fd,buf,3);
// write all three control word to arm
usleep(1*1000);
}
if(wbyte!=3)
{
Message->setText("error write");
Message->setText(QString::number(wbyte));
rbyte=read(fd,buff,10);
//ADC->setText(buff);
sscanf(buff,"%c",&valuee);
m1=int(valuee);
return(m1);
}
void HelloForm::starti2c()
{
while(1)
{
float adc_val=0;
adc_val=geti2c();
adc_val=(adc_val*5)/255.00;
usleep(1*1000);
ADC->setText(QString::number(adc_val));
}
}
//***********stop********//
void HelloForm::stopi2c()
{
ADC->setText(" ");
Message->setText("Stopped");
}

Answer 1

Hopefully this will get you started - it creates a timer which times out every 1000 milli seconds. The timer's timeout signal is connected to the same slot that your PushButton1 is connected to - starti2c.
QTimer *timer = new QTimer(this);
connect(timer, SIGNAL(timeout()), this, SLOT(starti2c()));
timer->start(1000);
That code should be placed below where you have your 2 connection statements.