josh/parport-2x20vfd
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filled out VFD::connect()

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git-svn-id: svn://anubis/misc/parport-2x20vfd@110 bd8a9e45-a331-0410-811e-c64571078777
This commit is contained in:
josh 2009-05-03 20:30:37 +00:00
parent 6e90883872
commit 3f8b4d0b5a
2 changed files with 74 additions and 0 deletions
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68
VFD.cc
View File

@ -1,3 +1,71 @@
/*
* Author: Josh Holtrop
* Date: 2009-05-03
* See VFD.h for documentation
*/
#include <stdio.h> /* perror() */
#include <unistd.h> /* usleep() */
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <linux/parport.h>
#include <linux/ppdev.h>
#include <iostream>
using namespace std;
#include "VFD.h"
VFD::VFD()
{
m_ppfd = -1;
}
bool VFD::connect(const std::string & parport)
{
const int mode = IEEE1284_MODE_BYTE;
const int direction = 0;
if ( (m_ppfd = open(parport.c_str(), O_RDWR)) < 0)
{
cerr << "Error opening '" << parport << "'";
perror("");
}
else if (ioctl(m_ppfd, PPCLAIM, NULL))
{
perror("Could not claim parallel port");
}
else if (ioctl(m_ppfd, PPSETMODE, &mode))
{
perror("Could not set parallel port mode");
ioctl(m_ppfd, PPRELEASE);
}
else if (ioctl(m_ppfd, PPDATADIR, &direction))
{
perror("Could not set parallel port direction");
ioctl(m_ppfd, PPRELEASE);
}
else
{
return true;
}
if (m_ppfd >= 0)
{
close(m_ppfd);
m_ppfd = -1;
}
return false;
}
void VFD::disconnect()
{
if (m_ppfd >= 0)
{
ioctl(m_ppfd, PPRELEASE);
close(m_ppfd);
m_ppfd = -1;
}
}

6
VFD.h
View File

@ -27,6 +27,8 @@
#ifndef VFD_H
#define VFD_H VFD_H
#include <string>
class VFD
{
public:
@ -36,8 +38,12 @@ class VFD
static const unsigned char E_DISABLE = 1;
static const unsigned char RS_COMMAND = 0;
static const unsigned char RS_DATA = 1;
VFD();
bool connect(const std::string & parport = "/dev/parport0");
void disconnect();
protected:
int m_ppfd; /* parallel port file descriptor */
};
#endif