IntelPIT.h

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/*
 * Copyright (C) 2015 Niek Linnenbank
 *
 * 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 3 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, see <http://www.gnu.org/licenses/>.
 */
 
#ifndef __LIBARCH_INTEL_PIT_H
#define __LIBARCH_INTEL_PIT_H
 
#include <Types.h>
#include <BitOperations.h>
#include <Timer.h>
#include "IntelIO.h"
 
class IntelPIT : public Timer
{
  private:
 
    static const uint OscillatorFreq = 1193182;
 
    static const uint InterruptNumber = 0;
 
    enum Registers
    {
        Control      = 0x43,
        Channel0Data = 0x40
    };
 
    enum ControlFlags
    {
        Channel0      = 0,
        LatchedRead   = 0,
        AccessLowHigh = (3 << 4),
        SquareWave    = (3 << 1),
        RateGenerator = (2 << 1),
    };
 
  public:
 
    IntelPIT();
 
    uint getCounter();
 
    virtual Result setFrequency(Size hertz);
 
    Result waitTrigger();
 
  private:
 
    Result setControl(ControlFlags flags);
 
  private:
 
    IntelIO m_io;
};
 
#endif /* __LIBARCH_INTEL_PIT_H */