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// license:GPL-2.0+
// copyright-holders:Matthew Conte
/*****************************************************************************
MAME/MESS NES APU CORE
Based on the Nofrendo/Nosefart NES RP2A03 sound emulation core written by
Matthew Conte (matt@conte.com) and redesigned for use in MAME/MESS by
Who Wants to Know? (wwtk@mail.com)
This core is written with the advise and consent of Matthew Conte and is
released under the GNU Public License.
*****************************************************************************
mmc5.h
MMC5 sound emulation core.
*****************************************************************************/
#ifndef MAME_SOUND_MMC5_H
#define MAME_SOUND_MMC5_H
#pragma once
#include "nes_defs.h"
class mmc5_sound_device : public device_t,
public device_sound_interface
{
public:
mmc5_sound_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock);
// configuration helpers
auto irq() { return m_irq_handler.bind(); }
u8 read(offs_t offset);
void write(offs_t offset, u8 data);
void pcm_w(u8 data);
protected:
// device-level overrides
virtual void device_start() override ATTR_COLD;
virtual void device_reset() override ATTR_COLD;
virtual void device_clock_changed() override;
// sound stream update overrides
virtual void sound_stream_update(sound_stream &stream) override;
private:
/* GLOBAL CONSTANTS */
static constexpr unsigned SYNCS_MAX1 = 0x20;
// internal state
mmc5_sound_t m_core; /* Sound core */
u32 m_samps_per_sync; /* Number of samples per vsync */
u32 m_vbl_times[SYNCS_MAX1]; /* VBL durations in samples */
u32 m_sync_times1[SYNCS_MAX1]; /* Samples per sync table */
sound_stream::sample_t m_square_lut[31]; // Non-linear Square wave output LUT
sound_stream *m_stream;
devcb_write_line m_irq_handler;
u16 m_frame_clocks;
void calculate_rates();
void tick_square(mmc5_sound_t::square_t &chan);
};
DECLARE_DEVICE_TYPE(MMC5_SOUND, mmc5_sound_device)
#endif // MAME_SOUND_MMC5_H
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