// 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<u8> 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