/* Yamaha YMZ280B driver by Aaron Giles YMZ280B 8-Channel PCMD8 PCM/ADPCM Decoder Features as listed in LSI-4MZ280B3 data sheet: Voice data stored in external memory can be played back simultaneously for up to eight voices Voice data format can be selected from 4-bit ADPCM, 8-bit PCM and 16-bit PCM Control of voice data external memory Up to 16M bytes of ROM or SRAM (x 8 bits, access time 150ms max) can be connected Continuous access is possible Loop playback between selective addresses is possible Voice data playback frequency control 4-bit ADPCM ................ 0.172 to 44.1kHz in 256 steps 8-bit PCM, 16-bit PCM ...... 0.172 to 88.2kHz in 512 steps 256 steps total level and 16 steps panpot can be set Voice signal is output in stereo 16-bit 2's complement MSB-first format */ #include #include "sndintrf.h" #include "streams.h" #include "ymz280b.h" #define MAX_SAMPLE_CHUNK 10000 #define MAKE_WAVS 0 #define FRAC_BITS 14 #define FRAC_ONE (1 << FRAC_BITS) #define FRAC_MASK (FRAC_ONE - 1) #define INTERNAL_BUFFER_SIZE (1 << 15) #define INTERNAL_SAMPLE_RATE (chip->master_clock * 2.0) #if MAKE_WAVS #include "wavwrite.h" #endif /* struct describing a single playing ADPCM voice */ struct YMZ280BVoice { UINT8 playing; /* 1 if we are actively playing */ 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 */ }; struct YMZ280BChip { sound_stream * stream; /* which stream are we using */ UINT8 *region_base; /* pointer to the base of the region */ UINT8 current_register; /* currently accessible register */ UINT8 status_register; /* current status register */ UINT8 irq_state; /* current IRQ state */ UINT8 irq_mask; /* current IRQ mask */ UINT8 irq_enable; /* current IRQ enable */ UINT8 keyon_enable; /* key on enable */ double master_clock; /* master clock frequency */ void (*irq_callback)(int); /* IRQ callback */ struct YMZ280BVoice voice[8]; /* the 8 voices */ UINT32 rom_readback_addr; /* where the CPU can read the ROM */ read8_handler ext_ram_read; /* external RAM read handler */ write8_handler ext_ram_write; /* external RAM write handler */ #if MAKE_WAVS void * wavresample; /* resampled waveform */ #endif INT16 *scratch; }; /* step size index shift table */ static const int index_scale[8] = { 0x0e6, 0x0e6, 0x0e6, 0x0e6, 0x133, 0x199, 0x200, 0x266 }; /* lookup table for the precomputed difference */ static int diff_lookup[16]; /* timer callback */ static TIMER_CALLBACK_PTR( update_irq_state_timer_0 ); static TIMER_CALLBACK_PTR( update_irq_state_timer_1 ); static TIMER_CALLBACK_PTR( update_irq_state_timer_2 ); static TIMER_CALLBACK_PTR( update_irq_state_timer_3 ); static TIMER_CALLBACK_PTR( update_irq_state_timer_4 ); static TIMER_CALLBACK_PTR( update_irq_state_timer_5 ); static TIMER_CALLBACK_PTR( update_irq_state_timer_6 ); static TIMER_CALLBACK_PTR( update_irq_state_timer_7 ); static void (*update_irq_state_cb[])(running_machine *, void *) = { update_irq_state_timer_0, update_irq_state_timer_1, update_irq_state_timer_2, update_irq_state_timer_3, update_irq_state_timer_4, update_irq_state_timer_5, update_irq_state_timer_6, update_irq_state_timer_7 }; INLINE void update_irq_state(struct YMZ280BChip *chip) { int irq_bits = chip->status_register & chip->irq_mask; /* always off if the enable is off */ if (!chip->irq_enable) irq_bits = 0; /* update the state if changed */ if (irq_bits && !chip->irq_state) { chip->irq_state = 1; if (chip->irq_callback) (*chip->irq_callback)(1); else logerror("YMZ280B: IRQ generated, but no callback specified!"); } else if (!irq_bits && chip->irq_state) { chip->irq_state = 0; if (chip->irq_callback) (*chip->irq_callback)(0); else logerror("YMZ280B: IRQ generated, but no callback specified!"); } } INLINE void update_step(struct YMZ280BChip *chip, struct YMZ280BVoice *voice) { double frequency; /* compute the frequency */ if (voice->mode == 1) frequency = chip->master_clock * (double)((voice->fnum & 0x0ff) + 1) * (1.0 / 256.0); else frequency = chip->master_clock * (double)((voice->fnum & 0x1ff) + 1) * (1.0 / 256.0); voice->output_step = (UINT32)(frequency * (double)FRAC_ONE / INTERNAL_SAMPLE_RATE); } INLINE void update_volumes(struct YMZ280BVoice *voice) { if (voice->pan == 8) { voice->output_left = voice->level; voice->output_right = voice->level; } else if (voice->pan < 8) { voice->output_left = voice->level; voice->output_right = voice->level * voice->pan / 8; } else { voice->output_left = voice->level * (15 - voice->pan) / 8; voice->output_right = voice->level; } } static void YMZ280B_state_save_update_step(void *param) { struct YMZ280BChip *chip = param; int j; for (j = 0; j < 8; j++) { struct YMZ280BVoice *voice = &chip->voice[j]; update_step(chip, voice); if(voice->irq_schedule) mame_timer_set_ptr(time_zero, chip, update_irq_state_cb[j]); } } static void update_irq_state_timer_common(void *param, int voicenum) { struct YMZ280BChip *chip = param; struct YMZ280BVoice *voice = &chip->voice[voicenum]; if(!voice->irq_schedule) return; voice->playing = 0; chip->status_register |= 1 << voicenum; update_irq_state(chip); voice->irq_schedule = 0; } static TIMER_CALLBACK_PTR( update_irq_state_timer_0 ) { update_irq_state_timer_common(param, 0); } static TIMER_CALLBACK_PTR( update_irq_state_timer_1 ) { update_irq_state_timer_common(param, 1); } static TIMER_CALLBACK_PTR( update_irq_state_timer_2 ) { update_irq_state_timer_common(param, 2); } static TIMER_CALLBACK_PTR( update_irq_state_timer_3 ) { update_irq_state_timer_common(param, 3); } static TIMER_CALLBACK_PTR( update_irq_state_timer_4 ) { update_irq_state_timer_common(param, 4); } static TIMER_CALLBACK_PTR( update_irq_state_timer_5 ) { update_irq_state_timer_common(param, 5); } static TIMER_CALLBACK_PTR( update_irq_state_timer_6 ) { update_irq_state_timer_common(param, 6); } static TIMER_CALLBACK_PTR( update_irq_state_timer_7 ) { update_irq_state_timer_common(param, 7); } /********************************************************************************************** compute_tables -- compute the difference tables ***********************************************************************************************/ static void compute_tables(void) { int nib; /* loop over all nibbles and compute the difference */ for (nib = 0; nib < 16; nib++) { int value = (nib & 0x07) * 2 + 1; diff_lookup[nib] = (nib & 0x08) ? -value : value; } } /********************************************************************************************** generate_adpcm -- general ADPCM decoding routine ***********************************************************************************************/ static int generate_adpcm(struct YMZ280BVoice *voice, UINT8 *base, INT16 *buffer, int samples) { int position = voice->position; int signal = voice->signal; int step = voice->step; int val; /* two cases: first cases is non-looping */ if (!voice->looping) { /* loop while we still have samples to generate */ while (samples) { /* compute the new amplitude and update the current step */ val = base[position / 2] >> ((~position & 1) << 2); signal += (step * diff_lookup[val & 15]) / 8; /* clamp to the maximum */ if (signal > 32767) signal = 32767; else if (signal < -32768) signal = -32768; /* adjust the step size and clamp */ step = (step * index_scale[val & 7]) >> 8; if (step > 0x6000) step = 0x6000; else if (step < 0x7f) step = 0x7f; /* output to the buffer, scaling by the volume */ *buffer++ = signal; samples--; /* next! */ position++; if (position >= voice->stop) break; } } /* second case: looping */ else { /* loop while we still have samples to generate */ while (samples) { /* compute the new amplitude and update the current step */ val = base[position / 2] >> ((~position & 1) << 2); signal += (step * diff_lookup[val & 15]) / 8; /* clamp to the maximum */ if (signal > 32767) signal = 32767; else if (signal < -32768) signal = -32768; /* adjust the step size and clamp */ step = (step * index_scale[val & 7]) >> 8; if (step > 0x6000) step = 0x6000; else if (step < 0x7f) step = 0x7f; /* output to the buffer, scaling by the volume */ *buffer++ = signal; samples--; /* next! */ position++; if (position == voice->loop_start && voice->loop_count == 0) { voice->loop_signal = signal; voice->loop_step = step; } if (position >= voice->loop_end) { if (voice->keyon) { position = voice->loop_start; signal = voice->loop_signal; step = voice->loop_step; voice->loop_count++; } } if (position >= voice->stop) break; } } /* update the parameters */ voice->position = position; voice->signal = signal; voice->step = step; return samples; } /********************************************************************************************** generate_pcm8 -- general 8-bit PCM decoding routine ***********************************************************************************************/ static int generate_pcm8(struct YMZ280BVoice *voice, UINT8 *base, INT16 *buffer, int samples) { int position = voice->position; int val; /* two cases: first cases is non-looping */ if (!voice->looping) { /* loop while we still have samples to generate */ while (samples) { /* fetch the current value */ val = base[position / 2]; /* output to the buffer, scaling by the volume */ *buffer++ = (INT8)val * 256; samples--; /* next! */ position += 2; if (position >= voice->stop) break; } } /* second case: looping */ else { /* loop while we still have samples to generate */ while (samples) { /* fetch the current value */ val = base[position / 2]; /* output to the buffer, scaling by the volume */ *buffer++ = (INT8)val * 256; samples--; /* next! */ position += 2; if (position >= voice->loop_end) { if (voice->keyon) position = voice->loop_start; } if (position >= voice->stop) break; } } /* update the parameters */ voice->position = position; return samples; } /********************************************************************************************** generate_pcm16 -- general 16-bit PCM decoding routine ***********************************************************************************************/ static int generate_pcm16(struct YMZ280BVoice *voice, UINT8 *base, INT16 *buffer, int samples) { int position = voice->position; int val; /* two cases: first cases is non-looping */ if (!voice->looping) { /* loop while we still have samples to generate */ while (samples) { /* fetch the current value */ val = (INT16)((base[position / 2 + 1] << 8) + base[position / 2]); /* output to the buffer, scaling by the volume */ *buffer++ = val; samples--; /* next! */ position += 4; if (position >= voice->stop) break; } } /* second case: looping */ else { /* loop while we still have samples to generate */ while (samples) { /* fetch the current value */ val = (INT16)((base[position / 2 + 1] << 8) + base[position / 2]); /* output to the buffer, scaling by the volume */ *buffer++ = val; samples--; /* next! */ position += 4; if (position >= voice->loop_end) { if (voice->keyon) position = voice->loop_start; } if (position >= voice->stop) break; } } /* update the parameters */ voice->position = position; return samples; } /********************************************************************************************** ymz280b_update -- update the sound chip so that it is in sync with CPU execution ***********************************************************************************************/ static void ymz280b_update(void *param, stream_sample_t **inputs, stream_sample_t **buffer, int length) { struct YMZ280BChip *chip = param; stream_sample_t *lacc = buffer[0]; stream_sample_t *racc = buffer[1]; int v; /* clear out the accumulator */ memset(lacc, 0, length * sizeof(lacc[0])); memset(racc, 0, length * sizeof(racc[0])); /* loop over voices */ for (v = 0; v < 8; v++) { struct YMZ280BVoice *voice = &chip->voice[v]; INT16 prev = voice->last_sample; INT16 curr = voice->curr_sample; INT16 *curr_data = chip->scratch; INT32 *ldest = lacc; INT32 *rdest = racc; UINT32 new_samples, samples_left; UINT32 final_pos; int remaining = length; int lvol = voice->output_left; int rvol = voice->output_right; /* quick out if we're not playing and we're at 0 */ if (!voice->playing && curr == 0) continue; /* finish off the current sample */ // if (voice->output_pos > 0) { /* interpolate */ while (remaining > 0 && voice->output_pos < FRAC_ONE) { int interp_sample = (((INT32)prev * (FRAC_ONE - voice->output_pos)) + ((INT32)curr * voice->output_pos)) >> FRAC_BITS; *ldest++ += interp_sample * lvol; *rdest++ += interp_sample * rvol; voice->output_pos += voice->output_step; remaining--; } /* if we're over, continue; otherwise, we're done */ if (voice->output_pos >= FRAC_ONE) voice->output_pos -= FRAC_ONE; else continue; } /* compute how many new samples we need */ final_pos = voice->output_pos + remaining * voice->output_step; new_samples = (final_pos + FRAC_ONE) >> FRAC_BITS; if (new_samples > MAX_SAMPLE_CHUNK) new_samples = MAX_SAMPLE_CHUNK; samples_left = new_samples; /* generate them into our buffer */ if (voice->playing) { switch (voice->mode) { case 1: samples_left = generate_adpcm(voice, chip->region_base, chip->scratch, new_samples); break; case 2: samples_left = generate_pcm8(voice, chip->region_base, chip->scratch, new_samples); break; case 3: samples_left = generate_pcm16(voice, chip->region_base, chip->scratch, new_samples); break; default: case 0: samples_left = 0; memset(chip->scratch, 0, new_samples * sizeof(chip->scratch[0])); break; } } /* if there are leftovers, ramp back to 0 */ if (samples_left) { int base = new_samples - samples_left; int i, t = (base == 0) ? curr : chip->scratch[base - 1]; for (i = 0; i < samples_left; i++) { if (t < 0) t = -((-t * 15) >> 4); else if (t > 0) t = (t * 15) >> 4; chip->scratch[base + i] = t; } /* if we hit the end and IRQs are enabled, signal it */ if (base != 0) { voice->playing = 0; /* set update_irq_state_timer. IRQ is signaled on next CPU execution. */ mame_timer_set_ptr(time_zero, chip, update_irq_state_cb[v]); voice->irq_schedule = 1; } } /* advance forward one sample */ prev = curr; curr = *curr_data++; /* then sample-rate convert with linear interpolation */ while (remaining > 0) { /* interpolate */ while (remaining > 0 && voice->output_pos < FRAC_ONE) { int interp_sample = (((INT32)prev * (FRAC_ONE - voice->output_pos)) + ((INT32)curr * voice->output_pos)) >> FRAC_BITS; *ldest++ += interp_sample * lvol; *rdest++ += interp_sample * rvol; voice->output_pos += voice->output_step; remaining--; } /* if we're over, grab the next samples */ if (voice->output_pos >= FRAC_ONE) { voice->output_pos -= FRAC_ONE; prev = curr; curr = *curr_data++; } } /* remember the last samples */ voice->last_sample = prev; voice->curr_sample = curr; } for (v = 0; v < length; v++) { buffer[0][v] /= 256; buffer[1][v] /= 256; } } /********************************************************************************************** YMZ280B_sh_start -- start emulation of the YMZ280B ***********************************************************************************************/ static void *ymz280b_start(int sndindex, int clock, const void *config) { const struct YMZ280Binterface *intf = config; struct YMZ280BChip *chip; chip = auto_malloc(sizeof(*chip)); memset(chip, 0, sizeof(*chip)); chip->ext_ram_read = intf->ext_read; chip->ext_ram_write = intf->ext_write; /* compute ADPCM tables */ compute_tables(); /* initialize the rest of the structure */ chip->master_clock = (double)clock / 384.0; chip->region_base = memory_region(intf->region); chip->irq_callback = intf->irq_callback; /* create the stream */ chip->stream = stream_create(0, 2, INTERNAL_SAMPLE_RATE, chip, ymz280b_update); /* allocate memory */ chip->scratch = auto_malloc(sizeof(chip->scratch[0]) * MAX_SAMPLE_CHUNK); /* state save */ { int j; state_save_register_item("YMZ280B", sndindex, chip->current_register); state_save_register_item("YMZ280B", sndindex, chip->status_register); state_save_register_item("YMZ280B", sndindex, chip->irq_state); state_save_register_item("YMZ280B", sndindex, chip->irq_mask); state_save_register_item("YMZ280B", sndindex, chip->irq_enable); state_save_register_item("YMZ280B", sndindex, chip->keyon_enable); state_save_register_item("YMZ280B", sndindex, chip->rom_readback_addr); for (j = 0; j < 8; j++) { state_save_register_item("YMZ280B.voice", sndindex*8+j, chip->voice[j].playing); state_save_register_item("YMZ280B.voice", sndindex*8+j, chip->voice[j].keyon); state_save_register_item("YMZ280B.voice", sndindex*8+j, chip->voice[j].looping); state_save_register_item("YMZ280B.voice", sndindex*8+j, chip->voice[j].mode); state_save_register_item("YMZ280B.voice", sndindex*8+j, chip->voice[j].fnum); state_save_register_item("YMZ280B.voice", sndindex*8+j, chip->voice[j].level); state_save_register_item("YMZ280B.voice", sndindex*8+j, chip->voice[j].pan); state_save_register_item("YMZ280B.voice", sndindex*8+j, chip->voice[j].start); state_save_register_item("YMZ280B.voice", sndindex*8+j, chip->voice[j].stop); state_save_register_item("YMZ280B.voice", sndindex*8+j, chip->voice[j].loop_start); state_save_register_item("YMZ280B.voice", sndindex*8+j, chip->voice[j].loop_end); state_save_register_item("YMZ280B.voice", sndindex*8+j, chip->voice[j].position); state_save_register_item("YMZ280B.voice", sndindex*8+j, chip->voice[j].signal); state_save_register_item("YMZ280B.voice", sndindex*8+j, chip->voice[j].step); state_save_register_item("YMZ280B.voice", sndindex*8+j, chip->voice[j].loop_signal); state_save_register_item("YMZ280B.voice", sndindex*8+j, chip->voice[j].loop_step); state_save_register_item("YMZ280B.voice", sndindex*8+j, chip->voice[j].loop_count); state_save_register_item("YMZ280B.voice", sndindex*8+j, chip->voice[j].output_left); state_save_register_item("YMZ280B.voice", sndindex*8+j, chip->voice[j].output_right); state_save_register_item("YMZ280B.voice", sndindex*8+j, chip->voice[j].output_pos); state_save_register_item("YMZ280B.voice", sndindex*8+j, chip->voice[j].last_sample); state_save_register_item("YMZ280B.voice", sndindex*8+j, chip->voice[j].curr_sample); state_save_register_item("YMZ280B.voice", sndindex*8+j, chip->voice[j].irq_schedule); } } state_save_register_func_postload_ptr(YMZ280B_state_save_update_step, chip); #if MAKE_WAVS chip->wavresample = wav_open("resamp.wav", INTERNAL_SAMPLE_RATE, 2); #endif /* success */ return chip; } /********************************************************************************************** YMZ280B_sh_stop -- stop emulation of the YMZ280B ***********************************************************************************************/ void YMZ280B_sh_stop(void) { #if MAKE_WAVS { int i; for (i = 0; i < MAX_BSMT2000; i++) { if (ymz280b[i].wavresample) wav_close(ymz280b[i].wavresample); } } #endif } /********************************************************************************************** write_to_register -- handle a write to the current register ***********************************************************************************************/ static void write_to_register(struct YMZ280BChip *chip, int data) { struct YMZ280BVoice *voice; int i; /* force an update */ stream_update(chip->stream); /* lower registers follow a pattern */ if (chip->current_register < 0x80) { voice = &chip->voice[(chip->current_register >> 2) & 7]; switch (chip->current_register & 0xe3) { case 0x00: /* pitch low 8 bits */ voice->fnum = (voice->fnum & 0x100) | (data & 0xff); update_step(chip, voice); break; case 0x01: /* pitch upper 1 bit, loop, key on, mode */ voice->fnum = (voice->fnum & 0xff) | ((data & 0x01) << 8); voice->looping = (data & 0x10) >> 4; voice->mode = (data & 0x60) >> 5; if (!voice->keyon && (data & 0x80) && chip->keyon_enable) { voice->playing = 1; voice->position = voice->start; voice->signal = voice->loop_signal = 0; voice->step = voice->loop_step = 0x7f; voice->loop_count = 0; /* if update_irq_state_timer is set, cancel it. */ voice->irq_schedule = 0; } if (voice->keyon && !(data & 0x80) && !voice->looping) { voice->playing = 0; /* if update_irq_state_timer is set, cancel it. */ voice->irq_schedule = 0; } voice->keyon = (data & 0x80) >> 7; update_step(chip, voice); break; case 0x02: /* total level */ voice->level = data; update_volumes(voice); break; case 0x03: /* pan */ voice->pan = data & 0x0f; update_volumes(voice); break; case 0x20: /* start address high */ voice->start = (voice->start & (0x00ffff << 1)) | (data << 17); break; case 0x21: /* loop start address high */ voice->loop_start = (voice->loop_start & (0x00ffff << 1)) | (data << 17); break; case 0x22: /* loop end address high */ voice->loop_end = (voice->loop_end & (0x00ffff << 1)) | (data << 17); break; case 0x23: /* stop address high */ voice->stop = (voice->stop & (0x00ffff << 1)) | (data << 17); break; case 0x40: /* start address middle */ voice->start = (voice->start & (0xff00ff << 1)) | (data << 9); break; case 0x41: /* loop start address middle */ voice->loop_start = (voice->loop_start & (0xff00ff << 1)) | (data << 9); break; case 0x42: /* loop end address middle */ voice->loop_end = (voice->loop_end & (0xff00ff << 1)) | (data << 9); break; case 0x43: /* stop address middle */ voice->stop = (voice->stop & (0xff00ff << 1)) | (data << 9); break; case 0x60: /* start address low */ voice->start = (voice->start & (0xffff00 << 1)) | (data << 1); break; case 0x61: /* loop start address low */ voice->loop_start = (voice->loop_start & (0xffff00 << 1)) | (data << 1); break; case 0x62: /* loop end address low */ voice->loop_end = (voice->loop_end & (0xffff00 << 1)) | (data << 1); break; case 0x63: /* stop address low */ voice->stop = (voice->stop & (0xffff00 << 1)) | (data << 1); break; default: logerror("YMZ280B: unknown register write %02X = %02X\n", chip->current_register, data); break; } } /* upper registers are special */ else { switch (chip->current_register) { case 0x84: /* ROM readback / RAM write (high) */ chip->rom_readback_addr &= 0xffff; chip->rom_readback_addr |= (data<<16); break; case 0x85: /* ROM readback / RAM write (med) */ chip->rom_readback_addr &= 0xff00ff; chip->rom_readback_addr |= (data<<8); break; case 0x86: /* ROM readback / RAM write (low) */ chip->rom_readback_addr &= 0xffff00; chip->rom_readback_addr |= data; break; case 0x87: /* RAM write */ if (chip->ext_ram_write) chip->ext_ram_write(chip->rom_readback_addr, data); else logerror("YMZ280B attempted RAM write to %X\n", chip->rom_readback_addr); break; case 0xfe: /* IRQ mask */ chip->irq_mask = data; update_irq_state(chip); break; case 0xff: /* IRQ enable, test, etc */ chip->irq_enable = (data & 0x10) >> 4; update_irq_state(chip); if (chip->keyon_enable && !(data & 0x80)) { for (i = 0; i < 8; i++) { chip->voice[i].playing = 0; /* if update_irq_state_timer is set, cancel it. */ chip->voice[i].irq_schedule = 0; } } else if (!chip->keyon_enable && (data & 0x80)) { for (i = 0; i < 8; i++) { if (chip->voice[i].keyon && chip->voice[i].looping) chip->voice[i].playing = 1; } } chip->keyon_enable = (data & 0x80) >> 7; break; default: logerror("YMZ280B: unknown register write %02X = %02X\n", chip->current_register, data); break; } } } /********************************************************************************************** compute_status -- determine the status bits ***********************************************************************************************/ static int compute_status(struct YMZ280BChip *chip) { UINT8 result; /* ROM/RAM readback? */ if (chip->current_register == 0x86) { return chip->region_base[chip->rom_readback_addr]; } /* force an update */ stream_update(chip->stream); result = chip->status_register; /* clear the IRQ state */ chip->status_register = 0; update_irq_state(chip); return result; } /********************************************************************************************** YMZ280B_status_0_r/YMZ280B_status_1_r -- handle a read from the status register ***********************************************************************************************/ READ8_HANDLER( YMZ280B_status_0_r ) { struct YMZ280BChip *chip = sndti_token(SOUND_YMZ280B, 0); return compute_status(chip); } READ8_HANDLER( YMZ280B_status_1_r ) { struct YMZ280BChip *chip = sndti_token(SOUND_YMZ280B, 1); return compute_status(chip); } READ16_HANDLER( YMZ280B_status_0_lsb_r ) { struct YMZ280BChip *chip = sndti_token(SOUND_YMZ280B, 0); return compute_status(chip); } READ16_HANDLER( YMZ280B_status_0_msb_r ) { struct YMZ280BChip *chip = sndti_token(SOUND_YMZ280B, 0); return compute_status(chip) << 8; } READ16_HANDLER( YMZ280B_status_1_lsb_r ) { struct YMZ280BChip *chip = sndti_token(SOUND_YMZ280B, 1); return compute_status(chip); } READ16_HANDLER( YMZ280B_status_1_msb_r ) { struct YMZ280BChip *chip = sndti_token(SOUND_YMZ280B, 1); return compute_status(chip) << 8; } /********************************************************************************************** YMZ280B_register_0_w/YMZ280B_register_1_w -- handle a write to the register select ***********************************************************************************************/ WRITE8_HANDLER( YMZ280B_register_0_w ) { struct YMZ280BChip *chip = sndti_token(SOUND_YMZ280B, 0); chip->current_register = data; } WRITE8_HANDLER( YMZ280B_register_1_w ) { struct YMZ280BChip *chip = sndti_token(SOUND_YMZ280B, 1); chip->current_register = data; } WRITE16_HANDLER( YMZ280B_register_0_lsb_w ) { struct YMZ280BChip *chip = sndti_token(SOUND_YMZ280B, 0); if (ACCESSING_LSB) chip->current_register = data & 0xff; } WRITE16_HANDLER( YMZ280B_register_0_msb_w ) { struct YMZ280BChip *chip = sndti_token(SOUND_YMZ280B, 0); if (ACCESSING_MSB) chip->current_register = (data >> 8) & 0xff; } WRITE16_HANDLER( YMZ280B_register_1_lsb_w ) { struct YMZ280BChip *chip = sndti_token(SOUND_YMZ280B, 1); if (ACCESSING_LSB) chip->current_register = data & 0xff; } WRITE16_HANDLER( YMZ280B_register_1_msb_w ) { struct YMZ280BChip *chip = sndti_token(SOUND_YMZ280B, 1); if (ACCESSING_MSB) chip->current_register = (data >> 8) & 0xff; } /********************************************************************************************** YMZ280B_data_0_w/YMZ280B_data_1_w -- handle a write to the current register ***********************************************************************************************/ WRITE8_HANDLER( YMZ280B_data_0_w ) { struct YMZ280BChip *chip = sndti_token(SOUND_YMZ280B, 0); write_to_register(chip, data); } WRITE8_HANDLER( YMZ280B_data_1_w ) { struct YMZ280BChip *chip = sndti_token(SOUND_YMZ280B, 1); write_to_register(chip, data); } WRITE16_HANDLER( YMZ280B_data_0_lsb_w ) { struct YMZ280BChip *chip = sndti_token(SOUND_YMZ280B, 0); if (ACCESSING_LSB) write_to_register(chip, data & 0xff); } WRITE16_HANDLER( YMZ280B_data_0_msb_w ) { struct YMZ280BChip *chip = sndti_token(SOUND_YMZ280B, 0); if (ACCESSING_MSB) write_to_register(chip, (data >> 8) & 0xff); } WRITE16_HANDLER( YMZ280B_data_1_lsb_w ) { struct YMZ280BChip *chip = sndti_token(SOUND_YMZ280B, 1); if (ACCESSING_LSB) write_to_register(chip, data & 0xff); } WRITE16_HANDLER( YMZ280B_data_1_msb_w ) { struct YMZ280BChip *chip = sndti_token(SOUND_YMZ280B, 1); if (ACCESSING_MSB) write_to_register(chip, (data >> 8) & 0xff); } /********************************************************************************************** YMZ280B_data_0_r/YMZ280B_data_1_r -- handle an external RAM read ***********************************************************************************************/ READ8_HANDLER( YMZ280B_data_0_r ) { UINT8 data; struct YMZ280BChip *chip = sndti_token(SOUND_YMZ280B, 0); data = chip->ext_ram_read(chip->rom_readback_addr - 1); chip->rom_readback_addr++; return data; } READ8_HANDLER( YMZ280B_data_1_r ) { UINT8 data; struct YMZ280BChip *chip = sndti_token(SOUND_YMZ280B, 1); data = chip->ext_ram_read(chip->rom_readback_addr - 1); chip->rom_readback_addr++; return data; } /************************************************************************** * Generic get_info **************************************************************************/ static void ymz280b_set_info(void *token, UINT32 state, sndinfo *info) { switch (state) { /* no parameters to set */ } } void ymz280b_get_info(void *token, UINT32 state, sndinfo *info) { switch (state) { /* --- the following bits of info are returned as 64-bit signed integers --- */ /* --- the following bits of info are returned as pointers to data or functions --- */ case SNDINFO_PTR_SET_INFO: info->set_info = ymz280b_set_info; break; case SNDINFO_PTR_START: info->start = ymz280b_start; break; case SNDINFO_PTR_STOP: /* Nothing */ break; case SNDINFO_PTR_RESET: /* Nothing */ break; /* --- the following bits of info are returned as NULL-terminated strings --- */ case SNDINFO_STR_NAME: info->s = "YMZ280B"; break; case SNDINFO_STR_CORE_FAMILY: info->s = "Yamaha Wavetable"; break; case SNDINFO_STR_CORE_VERSION: info->s = "1.0"; break; case SNDINFO_STR_CORE_FILE: info->s = __FILE__; break; case SNDINFO_STR_CORE_CREDITS: info->s = "Copyright (c) 2004, The MAME Team"; break; } }