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// license:BSD-3-Clause
// copyright-holders: Devin Acker
/***************************************************************************
NEC/Casio uPD933 "Phase Distortion" synthesis chip
***************************************************************************/
#ifndef MAME_SOUND_UPD933_H
#define MAME_SOUND_UPD933_H
#pragma once
#include <array>
class upd933_device : public device_t, public device_sound_interface
{
public:
upd933_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock = 0);
auto irq_cb() { return m_irq_cb.bind(); }
int rq_r();
void cs_w(int state); // chip select, active low
void id_w(int state); // irq disable, active low
void write(u8 data);
u8 read();
protected:
virtual void device_start() override ATTR_COLD;
virtual void device_reset() override ATTR_COLD;
virtual void device_clock_changed() override;
virtual void sound_stream_update(sound_stream &stream) override;
private:
static constexpr unsigned NOTE_SHIFT = 9;
static constexpr unsigned PITCH_SHIFT = 20;
static constexpr unsigned PITCH_FINE_SHIFT = 12;
static constexpr unsigned VOLUME_SHIFT = 12;
static constexpr unsigned ENV_DCA_SHIFT = 16;
static constexpr unsigned ENV_DCW_SHIFT = 16;
static constexpr unsigned ENV_DCO_SHIFT = 11;
struct env_t
{
u8 m_direction = 0, m_sustain = 1, m_irq = 0;
u32 m_rate = 0, m_target = 0, m_current = 0;
void update();
// calculate the next time this envelope generates an interrupt
bool calc_timeout(unsigned &samples);
};
struct voice_t
{
u8 m_wave[2] = {0};
u8 m_window = 0, m_ring_mod = 0, m_pitch_mod = 0, m_mute_other = 0;
u16 m_pitch = 0;
u32 m_position = 0, m_pitch_step = 0;
u16 m_dcw_limit = 0;
s16 m_pm_level = 0;
};
TIMER_CALLBACK_MEMBER(timer_tick);
s16 update(int vnum);
u8 irq_data();
void update_pending_irq();
void update_irq();
u32 env_rate(u8 data) const;
void update_pitch_step(int vnum);
sound_stream *m_stream;
static constexpr unsigned CLOCKS_PER_SAMPLE = 112;
devcb_write_line m_irq_cb;
u8 m_irq_pending, m_irq_state;
u8 m_cs, m_id;
emu_timer *m_irq_timer;
u16 m_cosine[0x800];
u32 m_pitch[0x80];
u16 m_pitch_fine[0x200];
u16 m_volume[0x200];
u8 m_sound_data[2];
u8 m_sound_data_pos;
std::array<u16, 256> m_sound_regs;
u32 m_sample_count;
s16 m_last_sample;
std::array<voice_t, 8> m_voice;
std::array<env_t, 8> m_dca, m_dco, m_dcw;
};
DECLARE_DEVICE_TYPE(UPD933, upd933_device)
#endif // MAME_SOUND_UPD933_H
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