// license:BSD-3-Clause // copyright-holders:Alex Marshall,nimitz,austere #ifndef MAME_SOUND_ICS2115_H #define MAME_SOUND_ICS2115_H #pragma once //************************************************************************** // TYPE DEFINITIONS //************************************************************************** // ======================> ics2115_device class ics2115_device : public device_t, public device_sound_interface { public: // construction/destruction ics2115_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock); auto irq() { return m_irq_cb.bind(); } u8 read(offs_t offset); void write(offs_t offset, u8 data); // 16-bit read / write handlers (when /IOCS16 is low) u16 word_r(offs_t offset, u16 mem_mask); void word_w(offs_t offset, u16 data, u16 mem_mask); TIMER_CALLBACK_MEMBER(timer_cb_0); TIMER_CALLBACK_MEMBER(timer_cb_1); protected: static constexpr u16 revision = 0x1; struct ics2115_voice { struct { s32 left; u32 acc, start, end; u16 fc; u8 ctl, saddr; } osc; struct { s32 left; u32 add; u32 start, end; u32 acc; u16 regacc; u8 incr; u8 pan, mode; } vol; union { struct { u8 ulaw : 1; u8 stop : 1; //stops wave + vol envelope u8 eightbit : 1; u8 loop : 1; u8 loop_bidir : 1; u8 irq : 1; u8 invert : 1; u8 irq_pending: 1; //IRQ on variable? } bitflags; u8 value; } osc_conf; union { struct { u8 done : 1; //indicates ramp has stopped u8 stop : 1; //stops the ramp u8 rollover : 1; //rollover (TODO) u8 loop : 1; u8 loop_bidir : 1; u8 irq : 1; //enable IRQ generation u8 invert : 1; //invert direction u8 irq_pending: 1; //(read only) IRQ pending //noenvelope == (done | disable) } bitflags; u8 value; } vol_ctrl; //Possibly redundant state. => improvements of wavetable logic //may lead to its elimination. union { struct { u8 on : 1; u8 ramp : 7; // 100 0000 = 0x40 maximum } bitflags; u8 value; } state; bool playing(); int update_volume_envelope(); int update_oscillator(); void update_ramp(); }; // device-level overrides virtual void device_start() override; virtual void device_reset() override; // internal callbacks virtual void sound_stream_update(sound_stream &stream, stream_sample_t **inputs, stream_sample_t **outputs, int samples) override; //internal register helper functions u16 reg_read(); void reg_write(u16 data, u16 mem_mask); void recalc_timer(int timer); void keyon(); void recalc_irq(); //stream helper functions int fill_output(ics2115_voice& voice, stream_sample_t *outputs[2], int samples); stream_sample_t get_sample(ics2115_voice& voice); sound_stream *m_stream; // internal state required_region_ptr m_rom; devcb_write_line m_irq_cb; s16 m_ulaw[256]; u16 m_volume[4096]; static const int volume_bits = 15; ics2115_voice m_voice[32]; struct { u8 scale, preset; emu_timer *timer; u64 period; /* in nsec */ } m_timer[2]; u8 m_active_osc; u8 m_osc_select; u8 m_reg_select; u8 m_irq_enabled, m_irq_pending; bool m_irq_on; //Unknown variable, seems to be effected by 0x12. Further investigation //Required. u8 m_vmode; }; // device type definition DECLARE_DEVICE_TYPE(ICS2115, ics2115_device) #endif // MAME_SOUND_ICS2115_H