QT程序：Led与按键显示
下面是我自己做的一个程序，把LED与按键结合到一起了，就是在出厂的LEd灯测试程序中在加了一个显示键值的框，但是有个问题就是键盘按键要时实检测，这导致了点击Led的按钮不会响应，这个问题苦恼我很久了，哪位大神指导下！！谢谢！/****************************************************************************
** Form implementation generated from reading ui file 'Led_Key.ui'
**
** Created: Fri Feb 1 00:08:08 2013
** by:The User Interface Compiler (uic)
**
** WARNING! All changes made in this file will be lost!
****************************************************************************/
#include "Led_Key.h"
#include <qbuttongroup.h>
#include <qcheckbox.h>
#include <qlabel.h>
#include <qlineedit.h>
#include <qpushbutton.h>
#include <qlayout.h>
#include <qvariant.h>
#include <qtooltip.h>
#include <qwhatsthis.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/select.h>
#include <sys/time.h>
#include <errno.h>
static int fd,fd1;
static char led1_s = 0, led2_s = 0, led3_s = 0, led4_s = 0;
char key_value_temp;
/*
*Constructs a Led_Key which is a child of 'parent', with the
*name 'name' and widget flags set to 'f'
*/
Led_Key::Led_Key( QWidget* parent,const char* name, WFlags fl )
: QWidget( parent, name, fl )
{
if ( !name )
setName( "Led_Key" );
resize( 402, 274 );
setCaption( tr( "TQ2440 LED&KEY Test" ) );
close = new QPushButton( this, "close" );
close->setGeometry( QRect( 200, 130, 60, 20 ) );
close->setText( tr( "Close" ) );
led_g = new QButtonGroup( this, "led_g" );
led_g->setGeometry( QRect( 10, 0, 250, 130 ) );
led_g->setTitle( tr( "LED Test" ) );
led4 = new QCheckBox( led_g, "led4" );
led4->setGeometry( QRect( 11, 96, 78, 19 ) );
led4->setText( tr( "LED4" ) );
led3 = new QCheckBox( led_g, "led3" );
led3->setGeometry( QRect( 11, 71, 78, 19 ) );
led3->setText( tr( "LED3" ) );
key_value = new QLabel( led_g, "key_value" );
key_value->setGeometry( QRect( 100, 80, 70, 31 ) );
key_value->setText( tr( "Key Value:" ) );
LineEdit1 = new QLineEdit( led_g, "LineEdit1" );
LineEdit1->setGeometry( QRect( 170, 81, 61, 23 ) );
alloff = new QPushButton( led_g, "alloff" );
alloff->setGeometry( QRect( 100, 50, 60, 20 ) );
alloff->setText( tr( "All Off" ) );
allon = new QPushButton( led_g, "allon" );
allon->setGeometry( QRect( 100, 20, 60, 20 ) );
allon->setText( tr( "All On" ) );
led1 = new QCheckBox( led_g, "led1" );
led1->setGeometry( QRect( 11, 21, 78, 19 ) );
led1->setText( tr( "LED1" ) );
led2 = new QCheckBox( led_g, "led2" );
led2->setGeometry( QRect( 11, 46, 78, 19 ) );
led2->setText( tr( "LED2" ) );
timer = new QTimer( this );
connect( timer, SIGNAL( timeout() ),this, SLOT( getkey() ) );
timer->start( 1000 );
// signals and slots connections
connect( led1, SIGNAL( stateChanged(int) ), this, SLOT( led1_p() ) );
connect( led2, SIGNAL( stateChanged(int) ), this, SLOT( led2_p() ) );
connect( led3, SIGNAL( stateChanged(int) ), this, SLOT( led3_p() ) );
connect( led4, SIGNAL( stateChanged(int) ), this, SLOT( led4_p() ) );
connect( allon, SIGNAL( clicked() ), this, SLOT( all_on() ) );
connect( alloff, SIGNAL( clicked() ), this, SLOT( all_off() ) );
connect( close, SIGNAL( clicked() ), this, SLOT( close() ) );
fd = open("/dev/TQ2440_leds", O_RDWR);
if (fd < 0)
{
perror("open device EmbedSky-leds");
SLOT( close() );
}
for (int i = 0 ; i < 4; i ++)
{
ioctl(fd, 0, i);
}
fd1=open("/dev/TQ2440_buttons",0);
if(fd1<0)
{
perror("can't open device buttons");
SLOT( close() );
}
}
/*
*Destroys the object and frees any allocated resources
*/
Led_Key::~Led_Key()
{
// no need to delete child widgets, Qt does it all for us
}
void Led_Key::getkey()
{
timer->stop();
fd_set rds;
int ret,i;
FD_ZERO(&rds);
FD_SET(fd1,&rds);
ret=select(fd1 + 1,&rds,NULL,NULL,NULL);
if(ret<0)
{
perror("select");
exit(1);
}
if(ret==0)
{
printf("Timeout.\n");
}
else if(FD_ISSET(fd1,&rds))
{
int ret =read(fd1,key_value_temp,sizeof(key_value_temp));
if(ret != sizeof(key_value_temp))
{
if(errno != EAGAIN)
perror("read buttons\n");
}
else
{
for(i=0;i<4;i++)
if( key_value_temp != 0 )
{
char temp;
temp=key_value_temp+0x30;
temp='\0';
LineEdit1->setText(tr(temp));
}
}
}
timer->start(1000);
}
void Led_Key::all_off()
{
for (int i = 0 ; i < 4; i ++)
{
ioctl(fd, 0, i);
}
led1->setChecked( 0);
led2->setChecked( 0);
led3->setChecked( 0);
led4->setChecked( 0);
// qWarning( "ledplayer::all_off(): Not implemented yet!" );
}
void Led_Key::all_on()
{
for (int i = 0 ; i < 4; i ++)
{
ioctl(fd, 1, i);
}
led1->setChecked( 1);
led2->setChecked( 1);
led3->setChecked( 1);
led4->setChecked( 1);
// qWarning( "ledplayer::all_on(): Not implemented yet!" );
}
void Led_Key::led1_p()
{
led1_s = ~led1_s;
// printf("led1_s = %d\n", led1_s);
if ( led1_s == 0)
ioctl(fd, 0, 0);
else
ioctl(fd, 1, 0);
// qWarning( "ledplayer::led1_p(): Not implemented yet!" );
}
void Led_Key::led2_p()
{
led2_s = ~led2_s;
// printf("led2_s = %d\n", led2_s);
if ( led2_s == 0)
ioctl(fd, 0, 1);
else
ioctl(fd, 1, 1);
// qWarning( "ledplayer::led2_p(): Not implemented yet!" );
}
void Led_Key::led3_p()
{
led3_s = ~led3_s;
// printf("led3_s = %d\n", led3_s);
if ( led3_s == 0)
ioctl(fd, 0, 2);
else
ioctl(fd, 1, 2);
// qWarning( "ledplayer::led3_p(): Not implemented yet!" );
}
void Led_Key::led4_p()
{
led4_s = ~led4_s;
// printf("led4_s = %d\n", led4_s);
if ( led4_s == 0)
ioctl(fd, 0, 3);
else
ioctl(fd, 1, 3);
// qWarning( "ledplayer::led4_p(): Not implemented yet!" );
}
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