ledctrl_pc

//      ledmvl.c
//
//      Copyright 2010 Serch <daemonfreedom.blogspot.com>
//
//      This program is free software; you can redistribute it and/or modify
//      it under the terms of the GNU General Public License as published by
//      the Free Software Foundation; either version 2 of the License, or
//      (at your option) any later version.
//
//      This program is distributed in the hope that it will be useful,
//      but WITHOUT ANY WARRANTY; without even the implied warranty of
//      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//      GNU General Public License for more details.
//
//      You should have received a copy of the GNU General Public License
//      along with this program; if not, write to the Free Software
//      Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
//      MA 02110-1301, USA.

#include <stdio.h>
#include <string.h>

char ruta[13];

FILE *fp;

int pedirNum();
void abrir();

int main(void)
{
    int var;
    strncpy(ruta, "/dev/ttyUSB0", 13);

    if ((fp=fopen(ruta, "a"))==NULL)
    {
        fprintf(stdout, "No se puede abrir el archivo\n");
        return 0;
    }

    fcloseall();

    do
    {
        fprintf(stdout, "Introduce valor (0 para salir)\n");
        var =pedirNum();
        if (var==0)
        {
            abrir(); putc(0, fp); fclose(fp);
            break;
        }

        else
        {
            switch(var)
            {
                case 1: abrir(); fputc(1, fp); fclose(fp); break;
                case 2: abrir(); fputc(2, fp); fclose(fp); break;
                case 3: abrir(); fputc(3, fp); fclose(fp); break;
                case 4: abrir(); fputc(4, fp); fclose(fp); break;
            }
        }
    } while (1);

    return 0;
}

int pedirNum()
{
    int valor;
    do
    {
        scanf("%d", &valor);
    } while (valor<0 || valor>4);
    return valor;
}

void abrir()
{
    if ((fp=fopen(ruta, "w"))==NULL)
    {
        fprintf(stdout, "Imposible abrir el archivo\n");
    }
}