ymemul.h File Reference

Detailed Description

YM-2149 emulator header.

Author:: Benjamin Gerard <ben@sashipa.com>

Date:: 1998/06/24

Id: ymemul.h,v 2.2 2003/10/11 04:40:25 benjihan Exp

#include "emu68/type68.h"

Go to the source code of this file.

Data Structures

struct ym2149_t

YM-2149 internal data structure. More...

YM-2149 registers

#define YM_BASEPERL   0

YM-2149 LSB period base (canal A).

#define YM_BASEPERH   1

YM-2149 MSB period base (canal A).

#define YM_BASEVOL   8

YM-2149 volume base register (canal A).

#define YM_PERL(N)   (YM_BASEPERL+(N)*2)

Canal #N LSB period.

#define YM_PERH(N)   (YM_BASEPERH+(N)*2)

Canal #N MSB periodr.

#define YM_VOL(N)   (YM_BASEVOL+(N))

Canal #N volume.

#define YM_NOISE   6

Noise period.

#define YM_MIXER   7

Mixer control.

#define YM_ENVL   11

Volume envelop LSB period.

#define YM_ENVH   12

Volume envelop MSB period.

#define YM_ENVTYPE   13

Volume envelop wave form.

#define YM_ENVSHAPE   13

Volume envelop wave form.

Initialization functions

unsigned int YM_sampling_rate (unsigned int f)

Set/get output buffer replay frequency.

int YM_reset (void)

Yamaha-2149 hardware reset.

int YM_init (void)

Yamaha-2149 first one first initialization.

Emulation functions

unsigned int YM_mix (cycle68_t cycle2mix)

Execute Yamaha-2149 emulation.

u32 * YM_get_buffer (void)

Yamaha get buffer.

void YM_subcycle (cycle68_t subcycle)

Change YM cycle counter base.

YM-2149 register access functions

void YM_writereg (u8 reg, u8 v, cycle68_t cycle)

Write in YM register.

u8 YM_readreg (u8 reg, cycle68_t cycle)

Read a YM-2119 register.

int YM_get_activevoices (void)

Get voices status.

void YM_set_activeVoices (int v)

Set voices status.

Variables

ym2149_t ym

YM-2149 emulator internal data.