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AmigActive 6
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AACD06.ISO
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Atari800
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pokey11.h
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C/C++ Source or Header
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1998-01-08
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135 lines
/*****************************************************************************/
/* */
/* Module: POKEY Chip Simulator Includes, V1.1 */
/* Purpose: To emulate the sound generation hardware of the Atari POKEY chip.*/
/* Author: Ron Fries */
/* Date: September 22, 1996 */
/* */
/*****************************************************************************/
/* */
/* License Information and Copyright Notice */
/* ======================================== */
/* */
/* PokeySound is Copyright(c) 1996 by Ron Fries */
/* */
/* This library is free software; you can redistribute it and/or modify it */
/* under the terms of version 2 of the GNU Library General Public License */
/* as published by the Free Software Foundation. */
/* */
/* This library 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 Library */
/* General Public License for more details. */
/* To obtain a copy of the GNU Library General Public License, write to the */
/* Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
/* */
/* Any permitted reproduction of these routines, in whole or in part, must */
/* bear this legend. */
/* */
/*****************************************************************************/
#ifndef __POKEY__
#define __POKEY__
#include "atari.h"
/* define some data types to keep it platform independent */
#ifdef COMP16 /* if 16-bit compiler defined */
#define int8 char
#define int16 int
#define int32 long
#else /* else default to 32-bit compiler */
#define int8 char
#define int16 short
#define int32 int
#endif
#define uint8 unsigned int8
#define uint16 unsigned int16
#define uint32 unsigned int32
/* CONSTANT DEFINITIONS */
/* As an alternative to using the exact frequencies, selecting a playback
frequency that is an exact division of the main clock provides a higher
quality output due to less aliasing. For best results, a value of
1787520 MHz is used for the main clock. With this value, both the
64 kHz and 15 kHz clocks are evenly divisible. Selecting a playback
frequency that is also a division of the clock provides the best
results. The best options are FREQ_64 divided by either 2, 3, or 4.
The best selection is based on a trade off between performance and
sound quality.
Of course, using a main clock frequency that is not exact will affect
the pitch of the output. With these numbers, the pitch will be low
by 0.127%. (More than likely, an actual unit will vary by this much!) */
#define FREQ_17_EXACT 1789790 /* exact 1.79 MHz clock freq */
#define FREQ_17_APPROX 1787520 /* approximate 1.79 MHz clock freq */
void Pokey_sound_init (ULONG freq17, UWORD playback_freq);
void Pokey_process_2 (register unsigned char *buffer, register UWORD n);
void Pokey_process (register unsigned char *buffer, register UWORD n);
void POKEY_Scanline(void);
void SendKey(UBYTE key);
void SendBRK(void);
extern ULONG Div_n_cnt[4], /* Divide by n counter. one for each channel */
Div_n_max[4], /* Divide by n maximum, one for each channel */
Div_n_irq[4]; /* Just the same counter, but used for IRQ */
extern int DELAYED_SERIN_IRQ;
extern int DELAYED_SEROUT_IRQ;
extern int DELAYED_XMTDONE_IRQ;
#define _AUDF1 0x00
#define _AUDC1 0x01
#define _AUDF2 0x02
#define _AUDC2 0x03
#define _AUDF3 0x04
#define _AUDC3 0x05
#define _AUDF4 0x06
#define _AUDC4 0x07
#define _AUDCTL 0x08
#define _STIMER 0x09
#define _SKRES 0x0a
#define _POTGO 0x0b
#define _SEROUT 0x0d
#define _IRQEN 0x0e
#define _SKCTLS 0x0f
#define _POT0 0x00
#define _POT1 0x01
#define _POT2 0x02
#define _POT3 0x03
#define _POT4 0x04
#define _POT5 0x05
#define _POT6 0x06
#define _POT7 0x07
#define _ALLPOT 0x08
#define _KBCODE 0x09
#define _RANDOM 0x0a
#define _SERIN 0x0d
#define _IRQST 0x0e
#define _SKSTAT 0x0f
extern UBYTE KBCODE;
extern UBYTE IRQST;
extern UBYTE IRQEN;
extern UBYTE SKSTAT;
/* channel definitions */
#define CHAN1 0
#define CHAN2 1
#define CHAN3 2
#define CHAN4 3
#define SAMPLE 4
UBYTE AUDF[4]; /* AUDFx (D200, D202, D204, D206) */
UBYTE AUDC[4]; /* AUDCx (D201, D203, D205, D207) */
UBYTE AUDCTL; /* AUDCTL (D208) */
void Init_Pokey (int *argc, char *argv[],int base);
#endif