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annotate psg.c @ 2274:bf1bb893f104

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Properly ignore low bits of SP start address in disassembler
author Michael Pavone <pavone@retrodev.com>
date Thu, 29 Dec 2022 22:44:35 -0800
parents 74112041b2c7
children 0343f0d5add0
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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140af5509ce7 Added copyright notice to source files and added GPL license text in COPYING
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1 /*
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2 Copyright 2013 Michael Pavone
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3 This file is part of BlastEm.
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4 BlastEm is free software distributed under the terms of the GNU General Public License version 3 or greater. See COPYING for full license text.
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5 */
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6 #include "psg.h"
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b7b7a1cab44a The local clone on my laptop got messed up and some changes had not been pushed. This commit represents the status of the working copy from that clone. It unfortunately contains some changes that I did not intend to commit yet, but this seems like the best option at the moment.
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7 #include "blastem.h"
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8 #include "event_log.h"
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9 #include <string.h>
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10 #include <stdlib.h>
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9a5dc22297f2 Somewhat better handling of high frequency PSG tones. Needs work to fully handle case where frequency > half our output sample rate
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11 #include <stdio.h>
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12 #include <math.h>
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13 void psg_init(psg_context * context, uint32_t master_clock, uint32_t clock_div)
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14 {
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15 memset(context, 0, sizeof(*context));
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16 context->audio = render_audio_source("PSG", master_clock, clock_div, 2);
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1c8d74f2ab0b Make the PSG and YM2612 use the master clock internal with an increment based on clock divider so that they stay perflectly in sync. Run both the PSG and YM2612 whenver one of them needs to be run.
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17 context->clock_inc = clock_div;
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18 for (int i = 0; i < 4; i++) {
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19 context->volume[i] = 0xF;
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20 }
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21 context->pan = 0xFF;
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22 }
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23
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24 void psg_enable_scope(psg_context *context, oscilloscope *scope, uint32_t master_clock)
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25 {
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26 context->scope = scope;
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27 static const char *names[] = {
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28 "PSG #1",
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29 "PSG #2",
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30 "PSG #3",
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31 "PSG Noise",
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32 };
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33 for (int i = 0; i < 4; i++)
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34 {
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35 context->scope_channel[i] = scope_add_channel(scope, names[i], master_clock / context->clock_inc);
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36 }
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37 }
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38
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39 void psg_free(psg_context *context)
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40 {
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41 render_free_source(context->audio);
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42 free(context);
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43 }
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44
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45 void psg_adjust_master_clock(psg_context * context, uint32_t master_clock)
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46 {
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47 render_audio_adjust_clock(context->audio, master_clock, context->clock_inc);
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48 }
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49
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50 void psg_write(psg_context * context, uint8_t value)
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51 {
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52 if (context->vgm) {
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53 vgm_sn76489_write(context->vgm, context->cycles, value);
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54 }
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55 event_log(EVENT_PSG_REG, context->cycles, sizeof(value), &value);
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56 if (value & 0x80) {
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57 context->latch = value & 0x70;
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58 uint8_t channel = value >> 5 & 0x3;
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59 if (value & 0x10) {
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60 context->volume[channel] = value & 0xF;
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61 } else {
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62 if (channel == 3) {
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63 switch(value & 0x3)
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64 {
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65 case 0:
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66 case 1:
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67 case 2:
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68 context->counter_load[3] = 0x10 << (value & 0x3);
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69 context->noise_use_tone = 0;
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70 break;
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71 default:
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72 context->counter_load[3] = context->counter_load[2];
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73 context->noise_use_tone = 1;
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74 }
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75 context->noise_type = value & 0x4;
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76 context->lsfr = 0x8000;
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77 } else {
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78 context->counter_load[channel] = (context->counter_load[channel] & 0x3F0) | (value & 0xF);
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79 if (channel == 2 && context->noise_use_tone) {
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80 context->counter_load[3] = context->counter_load[2];
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81 }
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82 }
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83 }
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84 } else {
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85 if (!(context->latch & 0x10)) {
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86 uint8_t channel = context->latch >> 5 & 0x3;
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87 if (channel != 3) {
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88 context->counter_load[channel] = (value << 4 & 0x3F0) | (context->counter_load[channel] & 0xF);
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89 if (channel == 2 && context->noise_use_tone) {
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90 context->counter_load[3] = context->counter_load[2];
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91 }
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92 }
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93 }
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94 }
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95 }
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96
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97 #define PSG_VOL_DIV 14
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98
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99 //table shamelessly swiped from PSG doc from smspower.org
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100 static int16_t volume_table[16] = {
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101 32767/PSG_VOL_DIV, 26028/PSG_VOL_DIV, 20675/PSG_VOL_DIV, 16422/PSG_VOL_DIV, 13045/PSG_VOL_DIV, 10362/PSG_VOL_DIV,
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102 8231/PSG_VOL_DIV, 6568/PSG_VOL_DIV, 5193/PSG_VOL_DIV, 4125/PSG_VOL_DIV, 3277/PSG_VOL_DIV, 2603/PSG_VOL_DIV,
354
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103 2067/PSG_VOL_DIV, 1642/PSG_VOL_DIV, 1304/PSG_VOL_DIV, 0
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104 };
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105
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106 void psg_run(psg_context * context, uint32_t cycles)
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107 {
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108 while (context->cycles < cycles) {
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109 uint8_t trigger[4] = {0,0,0,0};
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110 for (int i = 0; i < 4; i++) {
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111 if (context->counters[i]) {
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112 context->counters[i] -= 1;
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113 }
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114 if (!context->counters[i]) {
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115 context->counters[i] = context->counter_load[i];
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116 context->output_state[i] = !context->output_state[i];
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117 trigger[i] = context->output_state[i];
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118 if (i == 3 && context->output_state[i]) {
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119 context->noise_out = context->lsfr & 1;
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120 context->lsfr = (context->lsfr >> 1) | (context->lsfr << 15);
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121 if (context->noise_type) {
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122 //white noise
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123 if (context->lsfr & 0x4) {
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124 context->lsfr ^= 0x8000;
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125 }
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parents:
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126 }
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
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parents:
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127 }
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
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parents:
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128 }
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
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parents:
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129 }
838
9a5dc22297f2 Somewhat better handling of high frequency PSG tones. Needs work to fully handle case where frequency > half our output sample rate
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parents: 522
diff changeset
130
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2648081f3100 Implement Game Gear PSG panning
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131 int16_t left_accum = 0, right_accum = 0;
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132 uint8_t pan_left = 0x10, pan_right = 0x1;
2081
cfd53c94fffb Initial stab at RF5C164 emulation
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parents: 1946
diff changeset
133
2246
0e927fce8941 Fix bug in PSG oscilloscope output
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parents: 2243
diff changeset
134 int16_t value;
838
9a5dc22297f2 Somewhat better handling of high frequency PSG tones. Needs work to fully handle case where frequency > half our output sample rate
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parents: 522
diff changeset
135 for (int i = 0; i < 3; i++) {
9a5dc22297f2 Somewhat better handling of high frequency PSG tones. Needs work to fully handle case where frequency > half our output sample rate
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parents: 522
diff changeset
136 if (context->output_state[i]) {
2243
0d1d5dccdd28 Initial implementation of oscilloscope debug view
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parents: 2212
diff changeset
137 value = volume_table[context->volume[i]];
2196
2648081f3100 Implement Game Gear PSG panning
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parents: 2081
diff changeset
138 if (context->pan & pan_left) {
2648081f3100 Implement Game Gear PSG panning
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139 left_accum += value;
2648081f3100 Implement Game Gear PSG panning
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parents: 2081
diff changeset
140 }
2648081f3100 Implement Game Gear PSG panning
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parents: 2081
diff changeset
141 if (context->pan & pan_right) {
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142 right_accum += value;
2648081f3100 Implement Game Gear PSG panning
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parents: 2081
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143 }
2648081f3100 Implement Game Gear PSG panning
Michael Pavone <pavone@retrodev.com>
parents: 2081
diff changeset
144 pan_left <<= 1;
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parents: 2081
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145 pan_right <<= 1;
2246
0e927fce8941 Fix bug in PSG oscilloscope output
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parents: 2243
diff changeset
146 } else {
0e927fce8941 Fix bug in PSG oscilloscope output
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parents: 2243
diff changeset
147 value = 0;
838
9a5dc22297f2 Somewhat better handling of high frequency PSG tones. Needs work to fully handle case where frequency > half our output sample rate
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148 }
2243
0d1d5dccdd28 Initial implementation of oscilloscope debug view
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parents: 2212
diff changeset
149 if (context->scope) {
0d1d5dccdd28 Initial implementation of oscilloscope debug view
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parents: 2212
diff changeset
150 scope_add_sample(context->scope, context->scope_channel[i], value, trigger[i]);
0d1d5dccdd28 Initial implementation of oscilloscope debug view
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parents: 2212
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151 }
838
9a5dc22297f2 Somewhat better handling of high frequency PSG tones. Needs work to fully handle case where frequency > half our output sample rate
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diff changeset
152 }
2243
0d1d5dccdd28 Initial implementation of oscilloscope debug view
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parents: 2212
diff changeset
153 value = 0;
838
9a5dc22297f2 Somewhat better handling of high frequency PSG tones. Needs work to fully handle case where frequency > half our output sample rate
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diff changeset
154 if (context->noise_out) {
2243
0d1d5dccdd28 Initial implementation of oscilloscope debug view
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parents: 2212
diff changeset
155 value = volume_table[context->volume[3]];
2196
2648081f3100 Implement Game Gear PSG panning
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156 if (context->pan & pan_left) {
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parents: 2081
diff changeset
157 left_accum += value;
2648081f3100 Implement Game Gear PSG panning
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158 }
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parents: 2081
diff changeset
159 if (context->pan & pan_right) {
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parents: 2081
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160 right_accum += value;
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parents: 2081
diff changeset
161 }
838
9a5dc22297f2 Somewhat better handling of high frequency PSG tones. Needs work to fully handle case where frequency > half our output sample rate
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diff changeset
162 }
2243
0d1d5dccdd28 Initial implementation of oscilloscope debug view
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parents: 2212
diff changeset
163 if (context->scope) {
0d1d5dccdd28 Initial implementation of oscilloscope debug view
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parents: 2212
diff changeset
164 scope_add_sample(context->scope, context->scope_channel[3], value, trigger[3]);
0d1d5dccdd28 Initial implementation of oscilloscope debug view
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parents: 2212
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165 }
2081
cfd53c94fffb Initial stab at RF5C164 emulation
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parents: 1946
diff changeset
166
2196
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parents: 2081
diff changeset
167 render_put_stereo_sample(context->audio, left_accum, right_accum);
838
9a5dc22297f2 Somewhat better handling of high frequency PSG tones. Needs work to fully handle case where frequency > half our output sample rate
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parents: 522
diff changeset
168
380
1c8d74f2ab0b Make the PSG and YM2612 use the master clock internal with an increment based on clock divider so that they stay perflectly in sync. Run both the PSG and YM2612 whenver one of them needs to be run.
Mike Pavone <pavone@retrodev.com>
parents: 364
diff changeset
169 context->cycles += context->clock_inc;
354
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
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parents:
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170 }
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
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parents:
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171 }
15dd6418fe67 Initial PSG support. Mostly works, noise channel is borked though.
Mike Pavone <pavone@retrodev.com>
parents:
diff changeset
172
1909
508522f08e4d Initial stab at VGM logging support
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parents: 1865
diff changeset
173 void psg_vgm_log(psg_context *context, uint32_t master_clock, vgm_writer *vgm)
508522f08e4d Initial stab at VGM logging support
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parents: 1865
diff changeset
174 {
1911
f2ed8df7a002 Fix PSG frequency written to VGM header when logging
Michael Pavone <pavone@retrodev.com>
parents: 1909
diff changeset
175 vgm_sn76489_init(vgm, 16 * master_clock / context->clock_inc, 9, 16, 0);
1909
508522f08e4d Initial stab at VGM logging support
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parents: 1865
diff changeset
176 context->vgm = vgm;
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parents: 1865
diff changeset
177 for (int chan = 0; chan < 4; chan++)
508522f08e4d Initial stab at VGM logging support
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parents: 1865
diff changeset
178 {
508522f08e4d Initial stab at VGM logging support
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parents: 1865
diff changeset
179 uint8_t base = chan << 5 | 0x80;
508522f08e4d Initial stab at VGM logging support
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parents: 1865
diff changeset
180 vgm_sn76489_write(context->vgm, context->cycles, context->volume[chan] | base | 0x10);
508522f08e4d Initial stab at VGM logging support
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parents: 1865
diff changeset
181 if (chan == 3) {
508522f08e4d Initial stab at VGM logging support
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parents: 1865
diff changeset
182 if (context->noise_use_tone) {
508522f08e4d Initial stab at VGM logging support
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parents: 1865
diff changeset
183 vgm_sn76489_write(context->vgm, context->cycles, 3 | base);
508522f08e4d Initial stab at VGM logging support
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parents: 1865
diff changeset
184 } else {
508522f08e4d Initial stab at VGM logging support
Michael Pavone <pavone@retrodev.com>
parents: 1865
diff changeset
185 //0x10 = 0
508522f08e4d Initial stab at VGM logging support
Michael Pavone <pavone@retrodev.com>
parents: 1865
diff changeset
186 //0x20 = 1
508522f08e4d Initial stab at VGM logging support
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parents: 1865
diff changeset
187 //0x40 = 2
508522f08e4d Initial stab at VGM logging support
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parents: 1865
diff changeset
188 vgm_sn76489_write(context->vgm, context->cycles, context->counter_load[chan] >> 5 | base);
508522f08e4d Initial stab at VGM logging support
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parents: 1865
diff changeset
189 }
508522f08e4d Initial stab at VGM logging support
Michael Pavone <pavone@retrodev.com>
parents: 1865
diff changeset
190 } else {
508522f08e4d Initial stab at VGM logging support
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parents: 1865
diff changeset
191 vgm_sn76489_write(context->vgm, context->cycles, (context->counter_load[chan] & 0xF) | base);
508522f08e4d Initial stab at VGM logging support
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parents: 1865
diff changeset
192 vgm_sn76489_write(context->vgm, context->cycles, context->counter_load[chan] >> 4 & 0x3F);
508522f08e4d Initial stab at VGM logging support
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parents: 1865
diff changeset
193 }
508522f08e4d Initial stab at VGM logging support
Michael Pavone <pavone@retrodev.com>
parents: 1865
diff changeset
194 }
508522f08e4d Initial stab at VGM logging support
Michael Pavone <pavone@retrodev.com>
parents: 1865
diff changeset
195 }
508522f08e4d Initial stab at VGM logging support
Michael Pavone <pavone@retrodev.com>
parents: 1865
diff changeset
196
1427
4e5797b3935a WIP - New savestate format
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parents: 1356
diff changeset
197 void psg_serialize(psg_context *context, serialize_buffer *buf)
4e5797b3935a WIP - New savestate format
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parents: 1356
diff changeset
198 {
4e5797b3935a WIP - New savestate format
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parents: 1356
diff changeset
199 save_int16(buf, context->lsfr);
4e5797b3935a WIP - New savestate format
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parents: 1356
diff changeset
200 save_buffer16(buf, context->counter_load, 4);
4e5797b3935a WIP - New savestate format
Michael Pavone <pavone@retrodev.com>
parents: 1356
diff changeset
201 save_buffer16(buf, context->counters, 4);
4e5797b3935a WIP - New savestate format
Michael Pavone <pavone@retrodev.com>
parents: 1356
diff changeset
202 save_buffer8(buf, context->volume, 4);
4e5797b3935a WIP - New savestate format
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parents: 1356
diff changeset
203 uint8_t output_state = context->output_state[0] << 3 | context->output_state[1] << 2
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diff changeset
204 | context->output_state[2] << 1 | context->output_state[3]
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diff changeset
205 | context->noise_use_tone << 4;
4e5797b3935a WIP - New savestate format
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parents: 1356
diff changeset
206 save_int8(buf, output_state);
4e5797b3935a WIP - New savestate format
Michael Pavone <pavone@retrodev.com>
parents: 1356
diff changeset
207 save_int8(buf, context->noise_type);
4e5797b3935a WIP - New savestate format
Michael Pavone <pavone@retrodev.com>
parents: 1356
diff changeset
208 save_int8(buf, context->latch);
4e5797b3935a WIP - New savestate format
Michael Pavone <pavone@retrodev.com>
parents: 1356
diff changeset
209 save_int32(buf, context->cycles);
4e5797b3935a WIP - New savestate format
Michael Pavone <pavone@retrodev.com>
parents: 1356
diff changeset
210 }
4e5797b3935a WIP - New savestate format
Michael Pavone <pavone@retrodev.com>
parents: 1356
diff changeset
211
4e5797b3935a WIP - New savestate format
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parents: 1356
diff changeset
212 void psg_deserialize(deserialize_buffer *buf, void *vcontext)
4e5797b3935a WIP - New savestate format
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parents: 1356
diff changeset
213 {
4e5797b3935a WIP - New savestate format
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parents: 1356
diff changeset
214 psg_context *context = vcontext;
4e5797b3935a WIP - New savestate format
Michael Pavone <pavone@retrodev.com>
parents: 1356
diff changeset
215 context->lsfr = load_int16(buf);
4e5797b3935a WIP - New savestate format
Michael Pavone <pavone@retrodev.com>
parents: 1356
diff changeset
216 load_buffer16(buf, context->counter_load, 4);
4e5797b3935a WIP - New savestate format
Michael Pavone <pavone@retrodev.com>
parents: 1356
diff changeset
217 load_buffer16(buf, context->counters, 4);
4e5797b3935a WIP - New savestate format
Michael Pavone <pavone@retrodev.com>
parents: 1356
diff changeset
218 load_buffer8(buf, context->volume, 4);
4e5797b3935a WIP - New savestate format
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parents: 1356
diff changeset
219 uint8_t output_state = load_int8(buf);
1451
9c65819afec3 Fix operator precedence in psg serialize/deserialize
Michael Pavone <pavone@retrodev.com>
parents: 1427
diff changeset
220 context->output_state[0] = output_state >> 3 & 1;
9c65819afec3 Fix operator precedence in psg serialize/deserialize
Michael Pavone <pavone@retrodev.com>
parents: 1427
diff changeset
221 context->output_state[1] = output_state >> 2 & 1;
9c65819afec3 Fix operator precedence in psg serialize/deserialize
Michael Pavone <pavone@retrodev.com>
parents: 1427
diff changeset
222 context->output_state[2] = output_state >> 1 & 1;
1427
4e5797b3935a WIP - New savestate format
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parents: 1356
diff changeset
223 context->output_state[3] = output_state & 1;
1451
9c65819afec3 Fix operator precedence in psg serialize/deserialize
Michael Pavone <pavone@retrodev.com>
parents: 1427
diff changeset
224 context->noise_use_tone = output_state >> 4 & 1;
1427
4e5797b3935a WIP - New savestate format
Michael Pavone <pavone@retrodev.com>
parents: 1356
diff changeset
225 context->noise_type = load_int8(buf);
4e5797b3935a WIP - New savestate format
Michael Pavone <pavone@retrodev.com>
parents: 1356
diff changeset
226 context->latch = load_int8(buf);
4e5797b3935a WIP - New savestate format
Michael Pavone <pavone@retrodev.com>
parents: 1356
diff changeset
227 context->cycles = load_int32(buf);
4e5797b3935a WIP - New savestate format
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parents: 1356
diff changeset
228 }