65 lines
1.6 KiB
C
65 lines
1.6 KiB
C
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/***************************************************************************
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*
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* fm.h
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*
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* Copyright (c) 1991-1996 Microsoft Corporation. All Rights Reserved.
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*
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* This code provides VDD support for SB 2.0 sound output, specifically:
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* FM Chip OPL2 (a.k.a. Adlib)
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*
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***************************************************************************/
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/*****************************************************************************
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*
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* #defines
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*
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*****************************************************************************/
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/*
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* OPL2/Adlib Ports
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*/
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#define ADLIB_REGISTER_SELECT_PORT 0x388 // select the register to write data
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#define ADLIB_STATUS_PORT 0x388 // read to determine opl2 status
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#define ADLIB_DATA_PORT 0x389 // write data port
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/*
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* FM information
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*/
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#define AD_MASK 0x04 // adlib register used to control opl2
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#define AD_NEW 0x105 // used to determine if app entering opl3 mode
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#define BATCH_SIZE 40 // how much data is batched to opl2
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typedef struct { // structure written to fm device
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unsigned short IoPort;
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unsigned short PortData;
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} SYNTH_DATA, *PSYNTH_DATA;
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/*****************************************************************************
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*
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* Function Prototypes
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*
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*****************************************************************************/
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void ResetFM(void);
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BOOL OpenFMDevice(void);
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void CloseFMDevice(void);
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BOOL FMPortWrite(void);
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VOID
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FMDataWrite(
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BYTE data
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);
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VOID
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FMRegisterSelect(
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BYTE data
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);
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VOID
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FMStatusRead(
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BYTE *data
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);
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