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-rw-r--r--src/devices/sound/upd931.h153
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diff --git a/src/devices/sound/upd931.h b/src/devices/sound/upd931.h
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+// license:BSD-3-Clause
+// copyright-holders: Devin Acker
+
+/***************************************************************************
+ NEC/Casio uPD931 synthesis chip
+***************************************************************************/
+
+#ifndef MAME_SOUND_UPD931_H
+#define MAME_SOUND_UPD931_H
+
+#pragma once
+
+#include <array>
+
+class upd931_device : public device_t, public device_sound_interface, public device_memory_interface
+{
+public:
+ static constexpr feature_type imperfect_features() { return feature::SOUND; }
+
+ upd931_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock = 0);
+
+ auto &set_master(bool master) { m_master = master; return *this; }
+
+ auto filter_cb() { return m_filter_cb.bind(); }
+ auto sync_cb() { return m_sync_cb.bind(); }
+
+ void i1_w(int state);
+ void i2_w(int state);
+ void i3_w(int state);
+
+ void db_w(u8 data);
+ u8 db_r();
+
+ void sync_w(int state);
+
+protected:
+ device_memory_interface::space_config_vector memory_space_config() const override ATTR_COLD;
+
+ 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 PITCH_SHIFT = 15;
+ static constexpr unsigned VOLUME_SHIFT = 15;
+ static constexpr unsigned VOLUME_MAX = (0xff << VOLUME_SHIFT);
+
+ static constexpr unsigned CLOCKS_PER_SAMPLE = 8;
+ static constexpr unsigned RETRIG_RATE = 0x60000;
+
+ enum
+ {
+ FLAG_DECAY1 = 0, // bits 0-2 = decay1 rate
+ FLAG_ATTACK2 = 3, // bits 3-5 = attack2 rate
+ FLAG_ATTACK1 = 6, // bits 6-8 = attack1 rate
+ FLAG_DECAY2_LEVEL = 9, // bit 9 = decay1->decay2 transition point
+ FLAG_DECAY2 = 10, // bit 10 = decay2 rate
+ FLAG_RETRIGGER = 11, // bit 11 = retrigger note during decay (mandolin effect)
+ FLAG_ENV_SPLIT = 12, // bit 12 = wave A envelope split(?)
+ FLAG_ATTACK2_B = 13, // bit 13 = wave B fades out during attack2
+ FLAG_ATTACK2_A = 14, // bit 14 = wave A fades in during attack2
+ FLAG_DECAY2_DISABLE = 15, // bit 15 = disable decay2
+ FLAG_ENV_SHIFT = 16, // bit 16-17 = envelope/vibrato rate shift
+ FLAG_MIRROR = 19, // bit 19 = mirror waveform on alternate cycles
+ FLAG_INVERT = 20, // bit 20 = invert waveform on alternate cycles
+ FLAG_MODE_B = 21, // bit 21-22 = wave B output mode
+ FLAG_MODE_A = 23, // bit 23-24 = wave A output mode
+ FLAG_WAVE_SEL = 25, // bit 25 = wave data input select
+ };
+
+ enum
+ {
+ ENV_IDLE,
+ ENV_ATTACK1,
+ ENV_ATTACK2,
+ ENV_DECAY1,
+ ENV_DECAY2,
+ ENV_RELEASE
+ };
+
+ struct voice_t
+ {
+ u8 m_note = 0;
+ u8 m_octave = 0;
+ u16 m_pitch = 0;
+ u32 m_pitch_counter = 0;
+ s8 m_timbre_shift = 0;
+
+ u8 m_wave_pos = 0;
+ s8 m_wave_out[2] = {0};
+
+ u8 m_env_state = ENV_IDLE;
+ u32 m_env_counter = 0;
+ u32 m_env_level[2] = {0};
+ u8 m_force_release = 0;
+ };
+
+ void io_map(address_map &map) ATTR_COLD;
+
+ TIMER_CALLBACK_MEMBER(timer_tick);
+
+ void note_w(offs_t offset, u8 data);
+ void octave_w(offs_t offset, u8 data);
+ void wave_pos_w(u8 data);
+ void wave_data_w(u8 data);
+ void flags_w(u8 data);
+ void status_latch_w(offs_t offset, u8 data);
+ void vibrato_w(u8 data);
+ void sustain_w(u8 data);
+ void note_on_w(offs_t offset, u8 data);
+
+ void note_on(voice_t &voice);
+ void reset_timer();
+ void update_env(voice_t &voice);
+ void update_wave(voice_t &voice);
+
+ address_space_config m_io_config;
+ memory_access<8, 0, 0, ENDIANNESS_LITTLE>::specific m_io;
+
+ sound_stream *m_stream;
+ emu_timer *m_retrig_timer;
+
+ devcb_write8 m_filter_cb;
+ devcb_write_line m_sync_cb;
+
+ bool m_master;
+
+ u16 m_pitch[12*6 + 1]; // valid note range = C1 to C7
+
+ u8 m_db;
+ u8 m_i1, m_i2, m_i3;
+
+ u8 m_addr, m_data;
+ u8 m_status;
+
+ // data global to all voices
+ u8 m_wave[2][16];
+ u8 m_wave_pos;
+ u8 m_vibrato;
+ u8 m_sustain;
+ u8 m_reverb;
+
+ u32 m_flags;
+ u32 m_last_clock;
+
+ std::array<voice_t, 8> m_voice;
+};
+
+DECLARE_DEVICE_TYPE(UPD931, upd931_device)
+
+#endif // MAME_SOUND_UPD931_H