QT5 Use wiringpi i2c lcd example Pls

Hi, in designer Button display Status LED But i want to display Lcd 16x2 + i2c
command sudo i2cdetect -y 1
address 0x27
and include not error

#include "wiringPiI2C.h"
#include "wiringPi.h"

wiringPisetup();
wiringPiI2CSetup(27);
LcdDisplay("Test",0);

after run not Display to Lcd
Help Me Pls

There is not nearly enough code to understand what you are doing.

E.g. there is no indication what "LcdDisplay" is, whether this has anything to do with Qt at all, if you created and started the Qt applicaition object if it is, etc.

Cheers,
_

Quote:

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Originally Posted by anda_skoa

There is not nearly enough code to understand what you are doing.

E.g. there is no indication what "LcdDisplay" is, whether this has anything to do with Qt at all, if you created and started the Qt applicaition object if it is, etc.

Cheers,
_

---

i want display data to LCD 16x2

Attachment 12209

Ok, so nothing to do with Qt.
Moving to a better section.

Cheers,
_

Quote:

---

Originally Posted by anda_skoa

Ok, so nothing to do with Qt.
Moving to a better section.

Cheers,
_

---

Final Code QT5
Connect I2C(PCF8574) + LCD Char 16x2
Show Text After Key in
On Off Blacklight

Code:

---

#include "mainwindow.h"
#include <QApplication>
#include <QWidget>
#include <QtCore>
#include <QtGui>
#include <QMessageBox>
#include "ui_mainwindow.h"
#include <wiringPi.h>
#include <pcf8574.h>
#include <lcd.h>
 
#define LCDOFS(x)(lcdofs+x)
 
const int lcdofs=0x64;
const int  fd=lcdInit(2,16,4,LCDOFS(0),LCDOFS(2),LCDOFS(4),LCDOFS(5),LCDOFS(6),LCDOFS(7),0,0,0,0);
MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    pcf8574Setup(lcdofs,0x3f);
    wiringPiSetup();
    ui->setupUi(this);
}
 
MainWindow::~MainWindow()
{
    delete ui;
}
 
void MainWindow::on_pushButton_clicked()
{
 
    QString str;
    str =ui->lineEdit->text();
  pinMode(LCDOFS(1),OUTPUT);
  pinMode(LCDOFS(3),OUTPUT);
  digitalWrite(LCDOFS(1),0);// 0=Character New Lcd ;1= Character Not New
  digitalWrite(LCDOFS(3),1);// 0=off;1=on Backlight off
    lcdHome(fd);
    lcdClear(fd);
    lcdPosition(fd,0,0);
    lcdPrintf(fd,ui->lineEdit->text().toUtf8());
    lcdPosition(fd,0,1);
    lcdPrintf(fd,ui->lineEdit_2->text().toUtf8());
 
   //   digitalWrite(LCDOFS(1),1);//
    QMessageBox msgbox;
    msgbox.setWindowTitle("Message Box");
    msgbox.setText(str);
 
    msgbox.exec();
}

---

And what do you get vs. what did you expect to get?
Have you done any error checking?

E.g. shouldn't you call wiringPiSetup() before calling any of the other functions from that library?
Have you checked that lcdInit() works when called before that?

Cheers,
_