diff options
Diffstat (limited to 'trunk/src/emu/sound/saa1099.c')
-rw-r--r-- | trunk/src/emu/sound/saa1099.c | 466 |
1 files changed, 466 insertions, 0 deletions
diff --git a/trunk/src/emu/sound/saa1099.c b/trunk/src/emu/sound/saa1099.c new file mode 100644 index 00000000000..f93f1639247 --- /dev/null +++ b/trunk/src/emu/sound/saa1099.c @@ -0,0 +1,466 @@ +/*************************************************************************** + + Philips SAA1099 Sound driver + + By Juergen Buchmueller and Manuel Abadia + + SAA1099 register layout: + ======================== + + offs | 7654 3210 | description + -----+-----------+--------------------------- + 0x00 | ---- xxxx | Amplitude channel 0 (left) + 0x00 | xxxx ---- | Amplitude channel 0 (right) + 0x01 | ---- xxxx | Amplitude channel 1 (left) + 0x01 | xxxx ---- | Amplitude channel 1 (right) + 0x02 | ---- xxxx | Amplitude channel 2 (left) + 0x02 | xxxx ---- | Amplitude channel 2 (right) + 0x03 | ---- xxxx | Amplitude channel 3 (left) + 0x03 | xxxx ---- | Amplitude channel 3 (right) + 0x04 | ---- xxxx | Amplitude channel 4 (left) + 0x04 | xxxx ---- | Amplitude channel 4 (right) + 0x05 | ---- xxxx | Amplitude channel 5 (left) + 0x05 | xxxx ---- | Amplitude channel 5 (right) + | | + 0x08 | xxxx xxxx | Frequency channel 0 + 0x09 | xxxx xxxx | Frequency channel 1 + 0x0a | xxxx xxxx | Frequency channel 2 + 0x0b | xxxx xxxx | Frequency channel 3 + 0x0c | xxxx xxxx | Frequency channel 4 + 0x0d | xxxx xxxx | Frequency channel 5 + | | + 0x10 | ---- -xxx | Channel 0 octave select + 0x10 | -xxx ---- | Channel 1 octave select + 0x11 | ---- -xxx | Channel 2 octave select + 0x11 | -xxx ---- | Channel 3 octave select + 0x12 | ---- -xxx | Channel 4 octave select + 0x12 | -xxx ---- | Channel 5 octave select + | | + 0x14 | ---- ---x | Channel 0 frequency enable (0 = off, 1 = on) + 0x14 | ---- --x- | Channel 1 frequency enable (0 = off, 1 = on) + 0x14 | ---- -x-- | Channel 2 frequency enable (0 = off, 1 = on) + 0x14 | ---- x--- | Channel 3 frequency enable (0 = off, 1 = on) + 0x14 | ---x ---- | Channel 4 frequency enable (0 = off, 1 = on) + 0x14 | --x- ---- | Channel 5 frequency enable (0 = off, 1 = on) + | | + 0x15 | ---- ---x | Channel 0 noise enable (0 = off, 1 = on) + 0x15 | ---- --x- | Channel 1 noise enable (0 = off, 1 = on) + 0x15 | ---- -x-- | Channel 2 noise enable (0 = off, 1 = on) + 0x15 | ---- x--- | Channel 3 noise enable (0 = off, 1 = on) + 0x15 | ---x ---- | Channel 4 noise enable (0 = off, 1 = on) + 0x15 | --x- ---- | Channel 5 noise enable (0 = off, 1 = on) + | | + 0x16 | ---- --xx | Noise generator parameters 0 + 0x16 | --xx ---- | Noise generator parameters 1 + | | + 0x18 | --xx xxxx | Envelope generator 0 parameters + 0x18 | x--- ---- | Envelope generator 0 control enable (0 = off, 1 = on) + 0x19 | --xx xxxx | Envelope generator 1 parameters + 0x19 | x--- ---- | Envelope generator 1 control enable (0 = off, 1 = on) + | | + 0x1c | ---- ---x | All channels enable (0 = off, 1 = on) + 0x1c | ---- --x- | Synch & Reset generators + +***************************************************************************/ + +#include "emu.h" +#include "saa1099.h" + + +#define LEFT 0x00 +#define RIGHT 0x01 + +/* this structure defines a channel */ +struct saa1099_channel +{ + int frequency; /* frequency (0x00..0xff) */ + int freq_enable; /* frequency enable */ + int noise_enable; /* noise enable */ + int octave; /* octave (0x00..0x07) */ + int amplitude[2]; /* amplitude (0x00..0x0f) */ + int envelope[2]; /* envelope (0x00..0x0f or 0x10 == off) */ + + /* vars to simulate the square wave */ + double counter; + double freq; + int level; +}; + +/* this structure defines a noise channel */ +struct saa1099_noise +{ + /* vars to simulate the noise generator output */ + double counter; + double freq; + int level; /* noise polynomal shifter */ +}; + +/* this structure defines a SAA1099 chip */ +typedef struct _saa1099_state saa1099_state; +struct _saa1099_state +{ + device_t *device; + sound_stream * stream; /* our stream */ + int noise_params[2]; /* noise generators parameters */ + int env_enable[2]; /* envelope generators enable */ + int env_reverse_right[2]; /* envelope reversed for right channel */ + int env_mode[2]; /* envelope generators mode */ + int env_bits[2]; /* non zero = 3 bits resolution */ + int env_clock[2]; /* envelope clock mode (non-zero external) */ + int env_step[2]; /* current envelope step */ + int all_ch_enable; /* all channels enable */ + int sync_state; /* sync all channels */ + int selected_reg; /* selected register */ + struct saa1099_channel channels[6]; /* channels */ + struct saa1099_noise noise[2]; /* noise generators */ + double sample_rate; +}; + +static const int amplitude_lookup[16] = { + 0*32767/16, 1*32767/16, 2*32767/16, 3*32767/16, + 4*32767/16, 5*32767/16, 6*32767/16, 7*32767/16, + 8*32767/16, 9*32767/16, 10*32767/16, 11*32767/16, + 12*32767/16, 13*32767/16, 14*32767/16, 15*32767/16 +}; + +static const UINT8 envelope[8][64] = { + /* zero amplitude */ + { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, + /* maximum amplitude */ + {15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15, + 15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15, + 15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15, + 15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15, }, + /* single decay */ + {15,14,13,12,11,10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, + /* repetitive decay */ + {15,14,13,12,11,10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0, + 15,14,13,12,11,10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0, + 15,14,13,12,11,10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0, + 15,14,13,12,11,10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0 }, + /* single triangular */ + { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10,11,12,13,14,15, + 15,14,13,12,11,10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, + /* repetitive triangular */ + { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10,11,12,13,14,15, + 15,14,13,12,11,10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0, + 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10,11,12,13,14,15, + 15,14,13,12,11,10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0 }, + /* single attack */ + { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10,11,12,13,14,15, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, + /* repetitive attack */ + { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10,11,12,13,14,15, + 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10,11,12,13,14,15, + 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10,11,12,13,14,15, + 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10,11,12,13,14,15 } +}; + + +INLINE saa1099_state *get_safe_token(device_t *device) +{ + assert(device != NULL); + assert(device->type() == SAA1099); + return (saa1099_state *)downcast<legacy_device_base *>(device)->token(); +} + + +static void saa1099_envelope(saa1099_state *saa, int ch) +{ + if (saa->env_enable[ch]) + { + int step, mode, mask; + mode = saa->env_mode[ch]; + /* step from 0..63 and then loop in steps 32..63 */ + step = saa->env_step[ch] = + ((saa->env_step[ch] + 1) & 0x3f) | (saa->env_step[ch] & 0x20); + + mask = 15; + if (saa->env_bits[ch]) + mask &= ~1; /* 3 bit resolution, mask LSB */ + + saa->channels[ch*3+0].envelope[ LEFT] = + saa->channels[ch*3+1].envelope[ LEFT] = + saa->channels[ch*3+2].envelope[ LEFT] = envelope[mode][step] & mask; + if (saa->env_reverse_right[ch] & 0x01) + { + saa->channels[ch*3+0].envelope[RIGHT] = + saa->channels[ch*3+1].envelope[RIGHT] = + saa->channels[ch*3+2].envelope[RIGHT] = (15 - envelope[mode][step]) & mask; + } + else + { + saa->channels[ch*3+0].envelope[RIGHT] = + saa->channels[ch*3+1].envelope[RIGHT] = + saa->channels[ch*3+2].envelope[RIGHT] = envelope[mode][step] & mask; + } + } + else + { + /* envelope mode off, set all envelope factors to 16 */ + saa->channels[ch*3+0].envelope[ LEFT] = + saa->channels[ch*3+1].envelope[ LEFT] = + saa->channels[ch*3+2].envelope[ LEFT] = + saa->channels[ch*3+0].envelope[RIGHT] = + saa->channels[ch*3+1].envelope[RIGHT] = + saa->channels[ch*3+2].envelope[RIGHT] = 16; + } +} + + +static STREAM_UPDATE( saa1099_update ) +{ + saa1099_state *saa = (saa1099_state *)param; + int j, ch; + + /* if the channels are disabled we're done */ + if (!saa->all_ch_enable) + { + /* init output data */ + memset(outputs[LEFT],0,samples*sizeof(*outputs[LEFT])); + memset(outputs[RIGHT],0,samples*sizeof(*outputs[RIGHT])); + return; + } + + for (ch = 0; ch < 2; ch++) + { + switch (saa->noise_params[ch]) + { + case 0: saa->noise[ch].freq = 31250.0 * 2; break; + case 1: saa->noise[ch].freq = 15625.0 * 2; break; + case 2: saa->noise[ch].freq = 7812.5 * 2; break; + case 3: saa->noise[ch].freq = saa->channels[ch * 3].freq; break; + } + } + + /* fill all data needed */ + for( j = 0; j < samples; j++ ) + { + int output_l = 0, output_r = 0; + + /* for each channel */ + for (ch = 0; ch < 6; ch++) + { + if (saa->channels[ch].freq == 0.0) + saa->channels[ch].freq = (double)((2 * 15625) << saa->channels[ch].octave) / + (511.0 - (double)saa->channels[ch].frequency); + + /* check the actual position in the square wave */ + saa->channels[ch].counter -= saa->channels[ch].freq; + while (saa->channels[ch].counter < 0) + { + /* calculate new frequency now after the half wave is updated */ + saa->channels[ch].freq = (double)((2 * 15625) << saa->channels[ch].octave) / + (511.0 - (double)saa->channels[ch].frequency); + + saa->channels[ch].counter += saa->sample_rate; + saa->channels[ch].level ^= 1; + + /* eventually clock the envelope counters */ + if (ch == 1 && saa->env_clock[0] == 0) + saa1099_envelope(saa, 0); + if (ch == 4 && saa->env_clock[1] == 0) + saa1099_envelope(saa, 1); + } + + /* if the noise is enabled */ + if (saa->channels[ch].noise_enable) + { + /* if the noise level is high (noise 0: chan 0-2, noise 1: chan 3-5) */ + if (saa->noise[ch/3].level & 1) + { + /* subtract to avoid overflows, also use only half amplitude */ + output_l -= saa->channels[ch].amplitude[ LEFT] * saa->channels[ch].envelope[ LEFT] / 16 / 2; + output_r -= saa->channels[ch].amplitude[RIGHT] * saa->channels[ch].envelope[RIGHT] / 16 / 2; + } + } + + /* if the square wave is enabled */ + if (saa->channels[ch].freq_enable) + { + /* if the channel level is high */ + if (saa->channels[ch].level & 1) + { + output_l += saa->channels[ch].amplitude[ LEFT] * saa->channels[ch].envelope[ LEFT] / 16; + output_r += saa->channels[ch].amplitude[RIGHT] * saa->channels[ch].envelope[RIGHT] / 16; + } + } + } + + for (ch = 0; ch < 2; ch++) + { + /* check the actual position in noise generator */ + saa->noise[ch].counter -= saa->noise[ch].freq; + while (saa->noise[ch].counter < 0) + { + saa->noise[ch].counter += saa->sample_rate; + if( ((saa->noise[ch].level & 0x4000) == 0) == ((saa->noise[ch].level & 0x0040) == 0) ) + saa->noise[ch].level = (saa->noise[ch].level << 1) | 1; + else + saa->noise[ch].level <<= 1; + } + } + /* write sound data to the buffer */ + outputs[LEFT][j] = output_l / 6; + outputs[RIGHT][j] = output_r / 6; + } +} + + + +static DEVICE_START( saa1099 ) +{ + saa1099_state *saa = get_safe_token(device); + + /* copy global parameters */ + saa->device = device; + saa->sample_rate = device->clock() / 256; + + /* for each chip allocate one stream */ + saa->stream = device->machine().sound().stream_alloc(*device, 0, 2, saa->sample_rate, saa, saa1099_update); +} + +WRITE8_DEVICE_HANDLER( saa1099_control_w ) +{ + saa1099_state *saa = get_safe_token(device); + + if ((data & 0xff) > 0x1c) + { + /* Error! */ + logerror("%s: (SAA1099 '%s') Unknown register selected\n",device->machine().describe_context(), device->tag()); + } + + saa->selected_reg = data & 0x1f; + if (saa->selected_reg == 0x18 || saa->selected_reg == 0x19) + { + /* clock the envelope channels */ + if (saa->env_clock[0]) + saa1099_envelope(saa,0); + if (saa->env_clock[1]) + saa1099_envelope(saa,1); + } +} + + +WRITE8_DEVICE_HANDLER( saa1099_data_w ) +{ + saa1099_state *saa = get_safe_token(device); + int reg = saa->selected_reg; + int ch; + + /* first update the stream to this point in time */ + saa->stream->update(); + + switch (reg) + { + /* channel i amplitude */ + case 0x00: case 0x01: case 0x02: case 0x03: case 0x04: case 0x05: + ch = reg & 7; + saa->channels[ch].amplitude[LEFT] = amplitude_lookup[data & 0x0f]; + saa->channels[ch].amplitude[RIGHT] = amplitude_lookup[(data >> 4) & 0x0f]; + break; + /* channel i frequency */ + case 0x08: case 0x09: case 0x0a: case 0x0b: case 0x0c: case 0x0d: + ch = reg & 7; + saa->channels[ch].frequency = data & 0xff; + break; + /* channel i octave */ + case 0x10: case 0x11: case 0x12: + ch = (reg - 0x10) << 1; + saa->channels[ch + 0].octave = data & 0x07; + saa->channels[ch + 1].octave = (data >> 4) & 0x07; + break; + /* channel i frequency enable */ + case 0x14: + saa->channels[0].freq_enable = data & 0x01; + saa->channels[1].freq_enable = data & 0x02; + saa->channels[2].freq_enable = data & 0x04; + saa->channels[3].freq_enable = data & 0x08; + saa->channels[4].freq_enable = data & 0x10; + saa->channels[5].freq_enable = data & 0x20; + break; + /* channel i noise enable */ + case 0x15: + saa->channels[0].noise_enable = data & 0x01; + saa->channels[1].noise_enable = data & 0x02; + saa->channels[2].noise_enable = data & 0x04; + saa->channels[3].noise_enable = data & 0x08; + saa->channels[4].noise_enable = data & 0x10; + saa->channels[5].noise_enable = data & 0x20; + break; + /* noise generators parameters */ + case 0x16: + saa->noise_params[0] = data & 0x03; + saa->noise_params[1] = (data >> 4) & 0x03; + break; + /* envelope generators parameters */ + case 0x18: case 0x19: + ch = reg - 0x18; + saa->env_reverse_right[ch] = data & 0x01; + saa->env_mode[ch] = (data >> 1) & 0x07; + saa->env_bits[ch] = data & 0x10; + saa->env_clock[ch] = data & 0x20; + saa->env_enable[ch] = data & 0x80; + /* reset the envelope */ + saa->env_step[ch] = 0; + break; + /* channels enable & reset generators */ + case 0x1c: + saa->all_ch_enable = data & 0x01; + saa->sync_state = data & 0x02; + if (data & 0x02) + { + int i; + + /* Synch & Reset generators */ + logerror("%s: (SAA1099 '%s') -reg 0x1c- Chip reset\n",device->machine().describe_context(), device->tag()); + for (i = 0; i < 6; i++) + { + saa->channels[i].level = 0; + saa->channels[i].counter = 0.0; + } + } + break; + default: /* Error! */ + logerror("%s: (SAA1099 '%s') Unknown operation (reg:%02x, data:%02x)\n",device->machine().describe_context(), device->tag(), reg, data); + } +} + + +/************************************************************************** + * Generic get_info + **************************************************************************/ + +DEVICE_GET_INFO( saa1099 ) +{ + switch (state) + { + /* --- the following bits of info are returned as 64-bit signed integers --- */ + case DEVINFO_INT_TOKEN_BYTES: info->i = sizeof(saa1099_state); break; + + /* --- the following bits of info are returned as pointers to data or functions --- */ + case DEVINFO_FCT_START: info->start = DEVICE_START_NAME( saa1099 ); break; + case DEVINFO_FCT_STOP: /* Nothing */ break; + case DEVINFO_FCT_RESET: /* Nothing */ break; + + /* --- the following bits of info are returned as NULL-terminated strings --- */ + case DEVINFO_STR_NAME: strcpy(info->s, "SAA1099"); break; + case DEVINFO_STR_FAMILY: strcpy(info->s, "Philips"); break; + case DEVINFO_STR_VERSION: strcpy(info->s, "1.0"); break; + case DEVINFO_STR_SOURCE_FILE: strcpy(info->s, __FILE__); break; + case DEVINFO_STR_CREDITS: strcpy(info->s, "Copyright Nicola Salmoria and the MAME Team"); break; + } +} + + +DEFINE_LEGACY_SOUND_DEVICE(SAA1099, saa1099); |