schulung_tools/leds/leds.cpp


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#include "leds.h"
#include "ui_leds.h"

#include <stdio.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <fcntl.h>

void Leds::poll_shm(void) {
    for (int i = 0; i < 3; i++) {
        radioButton[i]->setChecked(shm->leds[i]);
    }
}

Leds::Leds(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::Leds)
{
}

int Leds::init(void) {
    int fd = open("/dev/shm/ivshmem", O_RDONLY);
    if (fd == -1) {
        fprintf(stderr, "open shm failed!");
        return -1;
    }

    shm = (struct ivmshmem *) mmap(NULL, 1024, PROT_READ, MAP_PRIVATE, fd, 0);
    if (shm == MAP_FAILED) {
        fprintf(stderr, "map shm failed!");
        return -1;
    }

    ui->setupUi(this);

    radioButton[0] = ui->radioButton_1;
    radioButton[1] = ui->radioButton_2;
    radioButton[2] = ui->radioButton_3;

    timer.setInterval(10);
    connect(&timer, SIGNAL(timeout()), this, SLOT(poll_shm()));
    timer.start();

    return 0;
}

Leds::~Leds()
{
    timer.stop();
    delete ui;
}