// license:BSD-3-Clause // copyright-holders:Aaron Giles /********************************************************************************************** * * Yamaha YMZ280B driver * by Aaron Giles * **********************************************************************************************/ #pragma once #ifndef __YMZ280B_H__ #define __YMZ280B_H__ #include "emu.h" #define MAKE_WAVS 0 #define MCFG_YMZ280B_IRQ_HANDLER(_devcb) \ devcb = &ymz280b_device::set_irq_handler(*device, DEVCB_##_devcb); #define MCFG_YMZ280B_EXT_READ_HANDLER(_devcb) \ devcb = &ymz280b_device::set_ext_read_handler(*device, DEVCB_##_devcb); #define MCFG_YMZ280B_EXT_WRITE_HANDLER(_devcb) \ devcb = &ymz280b_device::set_ext_write_handler(*device, DEVCB_##_devcb); class ymz280b_device : public device_t, public device_sound_interface { public: ymz280b_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock); // static configuration helpers template static devcb_base &set_irq_handler(device_t &device, _Object object) { return downcast(device).m_irq_handler.set_callback(object); } template static devcb_base &set_ext_read_handler(device_t &device, _Object object) { return downcast(device).m_ext_read_handler.set_callback(object); } template static devcb_base &set_ext_write_handler(device_t &device, _Object object) { return downcast(device).m_ext_write_handler.set_callback(object); } DECLARE_READ8_MEMBER( read ); DECLARE_WRITE8_MEMBER( write ); protected: // device-level overrides virtual void device_config_complete() override; virtual void device_start() override; virtual void device_post_load() override; virtual void device_reset() override; virtual void device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr) override; // sound stream update overrides virtual void sound_stream_update(sound_stream &stream, stream_sample_t **inputs, stream_sample_t **outputs, int samples) override; private: /* struct describing a single playing ADPCM voice */ struct YMZ280BVoice { UINT8 playing; /* 1 if we are actively playing */ bool ended; /* indicate voice has ended in case samples_left is 0 */ UINT8 keyon; /* 1 if the key is on */ UINT8 looping; /* 1 if looping is enabled */ UINT8 mode; /* current playback mode */ UINT16 fnum; /* frequency */ UINT8 level; /* output level */ UINT8 pan; /* panning */ UINT32 start; /* start address, in nibbles */ UINT32 stop; /* stop address, in nibbles */ UINT32 loop_start; /* loop start address, in nibbles */ UINT32 loop_end; /* loop end address, in nibbles */ UINT32 position; /* current position, in nibbles */ INT32 signal; /* current ADPCM signal */ INT32 step; /* current ADPCM step */ INT32 loop_signal; /* signal at loop start */ INT32 loop_step; /* step at loop start */ UINT32 loop_count; /* number of loops so far */ INT32 output_left; /* output volume (left) */ INT32 output_right; /* output volume (right) */ INT32 output_step; /* step value for frequency conversion */ INT32 output_pos; /* current fractional position */ INT16 last_sample; /* last sample output */ INT16 curr_sample; /* current sample target */ UINT8 irq_schedule; /* 1 if the IRQ state is updated by timer */ emu_timer *timer; }; UINT8 ymz280b_read_memory(UINT32 offset); void update_irq_state(); void update_step(struct YMZ280BVoice *voice); void update_volumes(struct YMZ280BVoice *voice); void update_irq_state_timer_common(int voicenum); int generate_adpcm(struct YMZ280BVoice *voice, INT16 *buffer, int samples); int generate_pcm8(struct YMZ280BVoice *voice, INT16 *buffer, int samples); int generate_pcm16(struct YMZ280BVoice *voice, INT16 *buffer, int samples); void write_to_register(int data); int compute_status(); // internal state struct YMZ280BVoice m_voice[8]; /* the 8 voices */ UINT8 m_current_register; /* currently accessible register */ UINT8 m_status_register; /* current status register */ UINT8 m_irq_state; /* current IRQ state */ UINT8 m_irq_mask; /* current IRQ mask */ UINT8 m_irq_enable; /* current IRQ enable */ UINT8 m_keyon_enable; /* key on enable */ UINT8 m_ext_mem_enable; /* external memory enable */ UINT8 m_ext_readlatch; /* external memory prefetched data */ UINT32 m_ext_mem_address_hi; UINT32 m_ext_mem_address_mid; UINT32 m_ext_mem_address; /* where the CPU can read the ROM */ devcb_write_line m_irq_handler; /* IRQ callback */ devcb_read8 m_ext_read_handler; /* external RAM read handler */ devcb_write8 m_ext_write_handler;/* external RAM write handler */ double m_master_clock; /* master clock frequency */ UINT8 *m_mem_base; /* pointer to the base of external memory */ UINT32 m_mem_size; sound_stream *m_stream; /* which stream are we using */ std::unique_ptr m_scratch; #if MAKE_WAVS void *m_wavresample; /* resampled waveform */ #endif }; extern const device_type YMZ280B; #endif /* __YMZ280B_H__ */