从源码提供的示例代码中找到GPIO.cpp与GPIO.h。创建一个gpio工程。放进去。

打开这个新的工程，将CPP与H文件，添加进去。

在UI中添加LCD Number

再添加一个label

向mainwindow.cpp添加

js
#include "gpio.h"

#define KEY_HOME 16777330
#define KEY_ENTER 16777220
#define KEY_NEXT 16777328
#define KEY_PREV 65

static unsigned char gpioflag = 1;
int countkey = 0;

void MainWindow::keyPressEvent(QKeyEvent *event)
{
    if(event->key()==KEY_ENTER)
    {
        if (gpioflag == 1)
        {
            ui->label->setText("led on");
            GPIO_Init();
            GPIO_ConfigPin(PB, 1, OUT);
            GPIO_SetPin(PB,1,0);
            gpioflag = 0;
        }
        else
        {
            ui->label->setText("led off");
            GPIO_Init();
            GPIO_ConfigPin(PB, 1, OUT);
            GPIO_SetPin(PB,1,1);
            gpioflag = 1;
        }
        countkey++;
        ui->lcdNumber->display(countkey);
        if(countkey > 1000)
            countkey = 0;

    }
    if(event->key()==KEY_NEXT)
    {
        ui->label->setText("KEY_NEXT");
    }
    if(event->key()==KEY_PREV)
    {
        ui->label->setText("KEY_PREV");
    }
    if(event->key()==KEY_HOME)
    {
        ui->label->setText("KEY_HOME");
    }

    printf("\r\n##########key cstx ############# \r\n");
}

向mainwindow.h中添加

js
void keyPressEvent(QKeyEvent *event);

执行qmake和make

把这个换成NULL

向mainwindow.h中添加

js
#include <QKeyEvent>
#include <QEvent>

传过去

js
scp gpio root@192.168.50.40:/root/qt_app

看下传来了吗

执行一下，确实能实现GPIO控制灯。

js

# mkdir qt_app
# cd qt_app
# ls
# pwd
/root/qt_app
# ls
# ls
gpio
# ./gpio

一共修改了mainwindow.h

js
#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QKeyEvent>
#include <QEvent>

QT_BEGIN_NAMESPACE
namespace Ui { class MainWindow; }
QT_END_NAMESPACE

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    MainWindow(QWidget *parent = NULL);
    ~MainWindow();

private:
    Ui::MainWindow *ui;
    void keyPressEvent(QKeyEvent *event);
};
#endif // MAINWINDOW_H

修改了mainwindow.cpp

js
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include "gpio.h"

#define KEY_HOME 16777330
#define KEY_ENTER 16777220
#define KEY_NEXT 16777328
#define KEY_PREV 65

static unsigned char gpioflag = 1;
int countkey = 0;

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);
}

MainWindow::~MainWindow()
{
    delete ui;
}

void MainWindow::keyPressEvent(QKeyEvent *event)
{
    if(event->key()==KEY_ENTER)
    {
        if (gpioflag == 1)
        {
            ui->label->setText("led on");
            GPIO_Init();
            GPIO_ConfigPin(PB, 1, OUT);
            GPIO_SetPin(PB,1,0);
            gpioflag = 0;
        }
        else
        {
            ui->label->setText("led off");
            GPIO_Init();
            GPIO_ConfigPin(PB, 1, OUT);
            GPIO_SetPin(PB,1,1);
            gpioflag = 1;
        }
        countkey++;
        ui->lcdNumber->display(countkey);
        if(countkey > 1000)
            countkey = 0;

    }
    if(event->key()==KEY_NEXT)
    {
        ui->label->setText("KEY_NEXT");
    }
    if(event->key()==KEY_PREV)
    {
        ui->label->setText("KEY_PREV");
    }
    if(event->key()==KEY_HOME)
    {
        ui->label->setText("KEY_HOME");
    }

    printf("\r\n##########key cstx ############# \r\n");
}