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80 lines
2.4 KiB
C
80 lines
2.4 KiB
C
/*
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* COPYRIGHT: GPL - See COPYING in the top level directory
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* PROJECT: ReactOS Virtual DOS Machine
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* FILE: subsystems/mvdm/ntvdm/hardware/pit.h
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* PURPOSE: Programmable Interval Timer emulation -
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* i82C54/8254 compatible
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* PROGRAMMERS: Aleksandar Andrejevic <theflash AT sdf DOT lonestar DOT org>
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* Hermes Belusca-Maito (hermes.belusca@sfr.fr)
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*/
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#ifndef _PIT_H_
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#define _PIT_H_
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/* DEFINES ********************************************************************/
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#define PIT_CHANNELS 3
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#define PIT_BASE_FREQUENCY 1193182LL
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#define PIT_DATA_PORT(x) (0x40 + (x))
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#define PIT_COMMAND_PORT 0x43
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#define WRITE_PIT_VALUE(PitChannel, Value) \
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(PitChannel).Bcd ? BCD_TO_BINARY(Value) : (Value)
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#define READ_PIT_VALUE(PitChannel, Value) \
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(PitChannel).Bcd ? BINARY_TO_BCD(Value) : (Value)
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typedef enum _PIT_MODE
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{
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PIT_MODE_INT_ON_TERMINAL_COUNT,
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PIT_MODE_HARDWARE_ONE_SHOT,
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PIT_MODE_RATE_GENERATOR,
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PIT_MODE_SQUARE_WAVE,
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PIT_MODE_SOFTWARE_STROBE,
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PIT_MODE_HARDWARE_STROBE
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} PIT_MODE, *PPIT_MODE;
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typedef VOID (WINAPI *PIT_OUT_FUNCTION)(LPVOID Param, BOOLEAN State);
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typedef struct _PIT_CHANNEL
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{
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/* PIT Status fields */
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PIT_MODE Mode;
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BOOLEAN Bcd;
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BYTE ReadWriteMode; // 0 --> Counter Latch ; 1 --> LSB R/W ; 2 --> MSB R/W ; 3 --> LSB then MSB R/W
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/* For interleaved reading and writing in 2-byte RW mode */
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BYTE ReadStatus; // Same convention as ReadWriteMode
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BYTE WriteStatus; // Same convention as ReadWriteMode
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/* For reading the PIT status byte */
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BOOLEAN LatchStatusSet;
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BYTE StatusLatch;
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/* Counting */
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BOOLEAN Gate;
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/**/WORD CountRegister;/**/ // Our ReloadValue ???
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WORD OutputLatch;
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/*******************************/
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WORD ReloadValue; // Max value of the counter
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WORD CurrentValue; // Real value of the counter
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/* PIT Output */
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BOOLEAN Out; // 0: Low ; 1: High
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/** HACK!! **/BOOLEAN FlipFlop;/** HACK!! **/
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LPVOID OutParam;
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PIT_OUT_FUNCTION OutFunction;
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} PIT_CHANNEL, *PPIT_CHANNEL;
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/* FUNCTIONS ******************************************************************/
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VOID PitSetOutFunction(BYTE Channel, LPVOID Param, PIT_OUT_FUNCTION OutFunction);
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VOID PitSetGate(BYTE Channel, BOOLEAN State);
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WORD PitGetReloadValue(BYTE Channel);
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VOID PitInitialize(VOID);
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#endif /* _PIT_H_ */
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