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// license:BSD-3-Clause
// copyright-holders:Olivier Galibert
#ifndef MAME_SOUND_SP0250_H
#define MAME_SOUND_SP0250_H
#pragma once
class sp0250_device : public device_t, public device_sound_interface
{
public:
sp0250_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
auto drq() { return m_drq.bind(); }
void set_pwm_mode() { m_pwm_mode = true; }
void write(uint8_t data);
int drq_r();
protected:
// device-level overrides
virtual void device_start() override ATTR_COLD;
virtual void device_reset() override ATTR_COLD;
// sound stream update overrides
virtual void sound_stream_update(sound_stream &stream) override;
TIMER_CALLBACK_MEMBER(delayed_stream_update) { m_stream->update(); }
private:
// internal helpers
int8_t next();
void load_values();
// state for each filter
class filter
{
public:
filter() : z1(0), z2(0) { }
void reset() { z1 = z2 = 0; }
int16_t apply(int16_t in)
{
int16_t z0 = in + ((z1 * F) >> 8) + ((z2 * B) >> 9);
z2 = z1;
z1 = z0;
return z0;
}
int16_t F, B;
int16_t z1, z2;
};
// timer for stream updates
emu_timer *m_timer;
// PWM state
bool m_pwm_mode;
uint8_t m_pwm_index;
uint8_t m_pwm_count;
uint32_t m_pwm_counts;
// LPC state
bool m_voiced;
int16_t m_amp;
uint16_t m_lfsr;
uint8_t m_pitch;
uint8_t m_pcount;
uint8_t m_repeat;
uint8_t m_rcount;
filter m_filter[6];
// FIFO state
uint8_t m_fifo[15];
uint8_t m_fifo_pos;
// external interfacing
sound_stream *m_stream;
devcb_write_line m_drq;
};
DECLARE_DEVICE_TYPE(SP0250, sp0250_device)
#endif // MAME_SOUND_SP0250_H
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