kopia lustrzana https://github.com/Hamlib/Hamlib
98 wiersze
2.2 KiB
C++
98 wiersze
2.2 KiB
C++
/* -*-C++-*-
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*******************************************************************************
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*
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* File: ppio.cc
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* Description:
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*
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*******************************************************************************
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*/
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/*
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* Copyright 2001 Free Software Foundation, Inc.
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*
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* This file is part of GNU Radio
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*
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* GNU Radio is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* GNU Radio is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GNU Radio; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#include "ppio.h"
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#include <stdlib.h>
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#include <sys/io.h>
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const static int parallel_port_base[3] = {
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0x3bc, // lp0 used to be on monochome display adapter
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0x378, // lp1 most common
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0x278 // lp2 secondary
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};
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// These control port bits are active low.
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// We toggle them so that this weirdness doesn't get get propagated
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// through our interface.
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static int CP_ACTIVE_LOW_BITS = 0x0B;
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// These status port bits are active low.
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// We toggle them so that this weirdness doesn't get get propagated
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// through our interface.
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static int SP_ACTIVE_LOW_BITS = 0x80;
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ppio::ppio (int which)
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{
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if (which < 0 || which > 2)
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abort ();
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base = parallel_port_base[which];
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// try to read ports. If we don't have the appropriate
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// ioperm bits set, we'll segfault here. At least it's deterministic...
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inb (base + 0);
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inb (base + 1);
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inb (base + 2);
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}
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void
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ppio::write_data (unsigned char v)
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{
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outb (v, base + 0);
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}
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unsigned char
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ppio::read_data ()
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{
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return inb (base + 0);
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}
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void
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ppio::write_control (unsigned char v)
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{
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outb (v ^ CP_ACTIVE_LOW_BITS, base + 2);
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}
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unsigned char
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ppio::read_control ()
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{
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return inb (base + 2) ^ CP_ACTIVE_LOW_BITS;
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}
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unsigned char
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ppio::read_status ()
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{
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return inb (base + 1) ^ SP_ACTIVE_LOW_BITS;
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}
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