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annotate rf5c164.c @ 2243:0d1d5dccdd28

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Initial implementation of oscilloscope debug view
author Michael Pavone <pavone@retrodev.com>
date Tue, 22 Nov 2022 17:57:02 -0800
parents 4fbe1e7c4a73
children 709036ee222a
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1 #include <stdio.h>
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2 #include "rf5c164.h"
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3
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4 enum {
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5 ENV,
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6 PAN,
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7 FDL,
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8 FDH,
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9 LSL,
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10 LSH,
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11 ST,
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12 CTRL,
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13 CHAN_ENABLE
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14 };
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15
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16 enum {
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17 START,
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18 NORMAL,
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19 LOOP
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20 };
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21
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22 #define FLAG_SOUNDING 0x80
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23 #define FLAG_PENDING 0x01
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24
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25 void rf5c164_init(rf5c164* pcm, uint32_t mclks, uint32_t divider)
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26 {
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27 pcm->audio = render_audio_source("rf5c164", mclks, divider * 384, 2);
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28 pcm->clock_step = divider * 4;
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29 }
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30
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31 void rf5c164_deinit(rf5c164* pcm)
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32 {
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33 render_free_source(pcm->audio);
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34 }
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35
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36 //48 cycles per channel
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37 //1 external write per 16 cycles
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38 //3 external writes per channel/sample
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39 // TCE pulse width is 200ns @ 10Mhz aka 2 cycles
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40 // total cycle is longer than TCE pulse, guessing 4 cycles
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41 // 12 memory access slots per channel sample
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42 // 3 for external memory writes
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43 // 1 for internal register writes?
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44 // 1 for refresh?
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45 // 6 for register reads?
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46 // or maybe 7 for register reads and writes happen when register is read?
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47
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48 #define CHECK pcm->cycle += pcm->clock_step; pcm->step++; if (pcm->cycle >= cycle) break
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49 #define CHECK_LOOP pcm->cycle += pcm->clock_step; pcm->step = 0; if (pcm->cycle >= cycle) break
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50
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51 static void write_if_not_sounding(rf5c164* pcm)
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52 {
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53 if (!(pcm->flags & FLAG_SOUNDING) && (pcm->flags & FLAG_PENDING)
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54 && pcm->pending_address >= 0x1000) {
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55 pcm->ram[(pcm->pending_address & 0xFFF) | pcm->ram_bank] = pcm->pending_byte;
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56 pcm->flags &= ~FLAG_PENDING;
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57 }
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58 }
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59
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60 static void write_always(rf5c164* pcm)
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61 {
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62 if ((pcm->flags & FLAG_PENDING) && pcm->pending_address >= 0x1000) {
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63 pcm->ram[(pcm->pending_address & 0xFFF) | pcm->ram_bank] = pcm->pending_byte;
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64 pcm->flags &= ~FLAG_PENDING;
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65 }
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66 }
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67
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68 void rf5c164_run(rf5c164* pcm, uint32_t cycle)
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69 {
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70 //TODO: Timing of this is all educated guesses based on documentation, do some real measurements
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71 while (pcm->cycle < cycle)
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72 {
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73 switch (pcm->step)
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74 {
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75 case 0:
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76 //handle internal memory write
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77 // RF5C164 datasheet seems to suggest only 1 "internal memory" write every 48 cycles when the chip is not sounding (globally)
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78 // and 1 write every 384 cycles when the chip is sounding (globally). However, games seem to expect to be able to write faster than that
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79 // RF5C68 datasheet suggests internal memory writes are unrestricted regardless of sounding status
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80 /*if ((pcm->cur_channel == pcm->selected_channel || !(pcm->flags & FLAG_SOUNDING)) && (pcm->flags & FLAG_PENDING)
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81 && pcm->pending_address <= ST
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82 ) {
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83 printf("pcm_write commit chan %d, %X - %X @ %u\n", pcm->selected_channel, pcm->pending_address, pcm->pending_byte, pcm->cycle);
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84 pcm->channels[pcm->selected_channel].regs[pcm->pending_address] = pcm->pending_byte;
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85 pcm->flags &= ~FLAG_PENDING;
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86 }*/
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87 write_if_not_sounding(pcm);
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88 CHECK;
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89 case 1:
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90 if ((pcm->flags & FLAG_SOUNDING) && !(pcm->channel_enable & (1 << pcm->cur_channel))) {
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91 if (pcm->channels[pcm->cur_channel].state == START) {
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92 pcm->channels[pcm->cur_channel].cur_ptr = pcm->channels[pcm->cur_channel].regs[ST] << 19;
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93 //printf("chan %d START %X (%X raw)\n", pcm->cur_channel, pcm->channels[pcm->cur_channel].cur_ptr >> 11, pcm->channels[pcm->cur_channel].cur_ptr);
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94 pcm->channels[pcm->cur_channel].state = NORMAL;
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95 pcm->channels[pcm->cur_channel].trigger = 1;
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96 } else if (pcm->channels[pcm->cur_channel].state == LOOP) {
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97 uint32_t old_ptr = pcm->channels[pcm->cur_channel].cur_ptr;
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98 pcm->channels[pcm->cur_channel].cur_ptr = (pcm->channels[pcm->cur_channel].regs[LSH] << 19) | (pcm->channels[pcm->cur_channel].regs[LSL] << 11);
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99 //printf("chan %d LOOP %X (%X raw)\n", pcm->cur_channel, pcm->channels[pcm->cur_channel].cur_ptr >> 11, pcm->channels[pcm->cur_channel].cur_ptr);
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100 pcm->channels[pcm->cur_channel].state = NORMAL;
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101 pcm->channels[pcm->cur_channel].trigger = old_ptr != pcm->channels[pcm->cur_channel].cur_ptr;
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102 } else {
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103 pcm->channels[pcm->cur_channel].trigger = 0;
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104 }
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105 }
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106 write_if_not_sounding(pcm);
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107 CHECK;
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108 case 2: {
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109 if ((pcm->flags & FLAG_SOUNDING) && !(pcm->channel_enable & (1 << pcm->cur_channel))) {
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110 uint8_t byte = pcm->ram[pcm->channels[pcm->cur_channel].cur_ptr >> 11];
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111 if (byte == 0xFF) {
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112 pcm->channels[pcm->cur_channel].state = LOOP;
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113 } else {
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114 pcm->channels[pcm->cur_channel].sample = byte;
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115 }
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116 }
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117 write_if_not_sounding(pcm);
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118 CHECK;
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119 }
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120 case 3:
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121 write_always(pcm);
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122 CHECK;
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123 case 4:
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124 if ((pcm->flags & FLAG_SOUNDING) && !(pcm->channel_enable & (1 << pcm->cur_channel))) {
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125 pcm->channels[pcm->cur_channel].cur_ptr += (pcm->channels[pcm->cur_channel].regs[FDH] << 8) | pcm->channels[pcm->cur_channel].regs[FDL];
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126 pcm->channels[pcm->cur_channel].cur_ptr &= 0x7FFFFFF;
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127 }
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128 write_if_not_sounding(pcm);
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129 CHECK;
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130 case 5:
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131 write_if_not_sounding(pcm);
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132 CHECK;
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133 case 6:
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134 write_if_not_sounding(pcm);
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135 CHECK;
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136 case 7:
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137 write_always(pcm);
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138 CHECK;
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139 case 8:
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parents:
diff changeset
140 write_if_not_sounding(pcm);
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Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
141 CHECK;
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Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
142 case 9:
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parents:
diff changeset
143 if ((pcm->flags & FLAG_SOUNDING) && !(pcm->channel_enable & (1 << pcm->cur_channel))) {
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parents:
diff changeset
144 int16_t sample = pcm->channels[pcm->cur_channel].sample & 0x7F;
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parents:
diff changeset
145 if (!(pcm->channels[pcm->cur_channel].sample & 0x80)) {
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parents:
diff changeset
146 sample = -sample;
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parents:
diff changeset
147 }
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Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
148 sample *= pcm->channels[pcm->cur_channel].regs[ENV];
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parents:
diff changeset
149 int16_t left = (sample * (pcm->channels[pcm->cur_channel].regs[PAN] >> 4)) >> 5;
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parents:
diff changeset
150 int16_t right = (sample * (pcm->channels[pcm->cur_channel].regs[PAN] & 0xF)) >> 5;
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parents:
diff changeset
151 //printf("chan %d, raw %X, sample %d, left %d, right %d, ptr %X (raw %X)\n", pcm->cur_channel, pcm->channels[pcm->cur_channel].sample, sample, left, right, pcm->channels[pcm->cur_channel].cur_ptr >> 11, pcm->channels[pcm->cur_channel].cur_ptr);
2243
0d1d5dccdd28 Initial implementation of oscilloscope debug view
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parents: 2164
diff changeset
152 if (pcm->scope) {
0d1d5dccdd28 Initial implementation of oscilloscope debug view
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parents: 2164
diff changeset
153 scope_add_sample(pcm->scope, pcm->channels[pcm->cur_channel].scope_channel, sample, pcm->channels[pcm->cur_channel].trigger);
0d1d5dccdd28 Initial implementation of oscilloscope debug view
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parents: 2164
diff changeset
154 }
2082
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diff changeset
155 pcm->left += left;
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parents:
diff changeset
156 pcm->right += right;
2243
0d1d5dccdd28 Initial implementation of oscilloscope debug view
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parents: 2164
diff changeset
157 } else if (pcm->scope) {
0d1d5dccdd28 Initial implementation of oscilloscope debug view
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parents: 2164
diff changeset
158 scope_add_sample(pcm->scope, pcm->channels[pcm->cur_channel].scope_channel, 0, 0);
2082
485834c0fea7 Forgot to add PCM source files
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parents:
diff changeset
159 }
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Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
160 write_if_not_sounding(pcm);
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Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
161 CHECK;
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parents:
diff changeset
162 case 10:
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parents:
diff changeset
163 //refresh?
2128
b0dcf5c9f353 Fix some issues with PCM dma/CPU write conflicts
Michael Pavone <pavone@retrodev.com>
parents: 2082
diff changeset
164 //does refresh happen at the same rate when sounding disabled? warning in sega docs suggests maybe not
b0dcf5c9f353 Fix some issues with PCM dma/CPU write conflicts
Michael Pavone <pavone@retrodev.com>
parents: 2082
diff changeset
165 write_if_not_sounding(pcm);
2082
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parents:
diff changeset
166 CHECK;
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Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
167 case 11:
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Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
168 write_always(pcm);
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Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
169 pcm->cur_channel++;
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Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
170 pcm->cur_channel &= 7;
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Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
171 if (!pcm->cur_channel) {
2145
62a53c052d9b PCM channel add should saturate on overflow, not wrap around
Michael Pavone <pavone@retrodev.com>
parents: 2128
diff changeset
172 if (pcm->left > INT16_MAX) {
62a53c052d9b PCM channel add should saturate on overflow, not wrap around
Michael Pavone <pavone@retrodev.com>
parents: 2128
diff changeset
173 pcm->left = INT16_MAX;
62a53c052d9b PCM channel add should saturate on overflow, not wrap around
Michael Pavone <pavone@retrodev.com>
parents: 2128
diff changeset
174 } else if (pcm->left < INT16_MIN) {
62a53c052d9b PCM channel add should saturate on overflow, not wrap around
Michael Pavone <pavone@retrodev.com>
parents: 2128
diff changeset
175 pcm->left = INT16_MIN;
62a53c052d9b PCM channel add should saturate on overflow, not wrap around
Michael Pavone <pavone@retrodev.com>
parents: 2128
diff changeset
176 }
62a53c052d9b PCM channel add should saturate on overflow, not wrap around
Michael Pavone <pavone@retrodev.com>
parents: 2128
diff changeset
177 if (pcm->right > INT16_MAX) {
62a53c052d9b PCM channel add should saturate on overflow, not wrap around
Michael Pavone <pavone@retrodev.com>
parents: 2128
diff changeset
178 pcm->right = INT16_MAX;
62a53c052d9b PCM channel add should saturate on overflow, not wrap around
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parents: 2128
diff changeset
179 } else if (pcm->right < INT16_MIN) {
62a53c052d9b PCM channel add should saturate on overflow, not wrap around
Michael Pavone <pavone@retrodev.com>
parents: 2128
diff changeset
180 pcm->right = INT16_MIN;
62a53c052d9b PCM channel add should saturate on overflow, not wrap around
Michael Pavone <pavone@retrodev.com>
parents: 2128
diff changeset
181 }
2082
485834c0fea7 Forgot to add PCM source files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
182 render_put_stereo_sample(pcm->audio, pcm->left, pcm->right);
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Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
183 pcm->left = pcm->right = 0;
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Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
184 }
485834c0fea7 Forgot to add PCM source files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
185 CHECK_LOOP;
485834c0fea7 Forgot to add PCM source files
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parents:
diff changeset
186 }
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parents:
diff changeset
187 }
485834c0fea7 Forgot to add PCM source files
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parents:
diff changeset
188 }
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parents:
diff changeset
189
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parents:
diff changeset
190 void rf5c164_write(rf5c164* pcm, uint16_t address, uint8_t value)
485834c0fea7 Forgot to add PCM source files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
191 {
485834c0fea7 Forgot to add PCM source files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
192 //printf("pcm_write %X - %X @ %u\n", address, value, pcm->cycle);
485834c0fea7 Forgot to add PCM source files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
193 if (address == CTRL) {
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Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
194 pcm->flags &= ~FLAG_SOUNDING;
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Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
195 pcm->flags |= value & FLAG_SOUNDING;
485834c0fea7 Forgot to add PCM source files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
196 if (value & 0x40) {
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parents:
diff changeset
197 pcm->selected_channel = value & 0x7;
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parents:
diff changeset
198 //printf("selected channel %d\n", pcm->selected_channel);
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parents:
diff changeset
199 } else {
485834c0fea7 Forgot to add PCM source files
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parents:
diff changeset
200 pcm->ram_bank = value << 12 & 0xF000;
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Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
201 //printf("selected RAM bank %X\n", pcm->ram_bank);
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Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
202 }
485834c0fea7 Forgot to add PCM source files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
203 if (!(pcm->flags & FLAG_SOUNDING)) {
485834c0fea7 Forgot to add PCM source files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
204 pcm->left = pcm->right = 0;
485834c0fea7 Forgot to add PCM source files
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parents:
diff changeset
205 }
485834c0fea7 Forgot to add PCM source files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
206 } else if (address == CHAN_ENABLE) {
485834c0fea7 Forgot to add PCM source files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
207 uint8_t changed = pcm->channel_enable ^ value;
485834c0fea7 Forgot to add PCM source files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
208 pcm->channel_enable = value;
485834c0fea7 Forgot to add PCM source files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
209 for (int i = 0; i < 8; i++)
485834c0fea7 Forgot to add PCM source files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
210 {
485834c0fea7 Forgot to add PCM source files
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parents:
diff changeset
211 int mask = 1 << i;
2145
62a53c052d9b PCM channel add should saturate on overflow, not wrap around
Michael Pavone <pavone@retrodev.com>
parents: 2128
diff changeset
212 if ((changed & mask) && !(mask & value)) {
2082
485834c0fea7 Forgot to add PCM source files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
213 pcm->channels[i].state = START;
485834c0fea7 Forgot to add PCM source files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
214 }
485834c0fea7 Forgot to add PCM source files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
215 }
485834c0fea7 Forgot to add PCM source files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
216 } else if (address <= ST) {
485834c0fea7 Forgot to add PCM source files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
217 //See note in first step of rf5c164_run
485834c0fea7 Forgot to add PCM source files
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parents:
diff changeset
218 pcm->channels[pcm->selected_channel].regs[address] = value;
485834c0fea7 Forgot to add PCM source files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
219 } else {
485834c0fea7 Forgot to add PCM source files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
220 pcm->pending_address = address;
485834c0fea7 Forgot to add PCM source files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
221 pcm->pending_byte = value;
485834c0fea7 Forgot to add PCM source files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
222 pcm->flags |= FLAG_PENDING;
485834c0fea7 Forgot to add PCM source files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
223 }
485834c0fea7 Forgot to add PCM source files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
224 }
485834c0fea7 Forgot to add PCM source files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
225
485834c0fea7 Forgot to add PCM source files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
226 uint8_t rf5c164_read(rf5c164* pcm, uint16_t address)
485834c0fea7 Forgot to add PCM source files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
227 {
485834c0fea7 Forgot to add PCM source files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
228 if (address >= 0x10 && address < 0x20) {
485834c0fea7 Forgot to add PCM source files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
229 uint16_t chan = address >> 1 & 0x7;
485834c0fea7 Forgot to add PCM source files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
230 if (address & 1) {
485834c0fea7 Forgot to add PCM source files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
231 return pcm->channels[chan].cur_ptr >> 19;
485834c0fea7 Forgot to add PCM source files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
232 } else {
485834c0fea7 Forgot to add PCM source files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
233 return pcm->channels[chan].cur_ptr >> 11;
485834c0fea7 Forgot to add PCM source files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
234 }
485834c0fea7 Forgot to add PCM source files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
235 } else if (address >= 0x1000 && !(pcm->flags & FLAG_SOUNDING)) {
485834c0fea7 Forgot to add PCM source files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
236 return pcm->ram[pcm->ram_bank | (address & 0xFFF)];
485834c0fea7 Forgot to add PCM source files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
237 } else {
485834c0fea7 Forgot to add PCM source files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
238 return 0xFF;
485834c0fea7 Forgot to add PCM source files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
239 }
485834c0fea7 Forgot to add PCM source files
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
240 }
2243
0d1d5dccdd28 Initial implementation of oscilloscope debug view
Michael Pavone <pavone@retrodev.com>
parents: 2164
diff changeset
241
0d1d5dccdd28 Initial implementation of oscilloscope debug view
Michael Pavone <pavone@retrodev.com>
parents: 2164
diff changeset
242 void rf5c164_enable_scope(rf5c164* pcm, oscilloscope *scope)
0d1d5dccdd28 Initial implementation of oscilloscope debug view
Michael Pavone <pavone@retrodev.com>
parents: 2164
diff changeset
243 {
0d1d5dccdd28 Initial implementation of oscilloscope debug view
Michael Pavone <pavone@retrodev.com>
parents: 2164
diff changeset
244 static const char *names[] = {
0d1d5dccdd28 Initial implementation of oscilloscope debug view
Michael Pavone <pavone@retrodev.com>
parents: 2164
diff changeset
245 "Richo #1",
0d1d5dccdd28 Initial implementation of oscilloscope debug view
Michael Pavone <pavone@retrodev.com>
parents: 2164
diff changeset
246 "Richo #2",
0d1d5dccdd28 Initial implementation of oscilloscope debug view
Michael Pavone <pavone@retrodev.com>
parents: 2164
diff changeset
247 "Richo #3",
0d1d5dccdd28 Initial implementation of oscilloscope debug view
Michael Pavone <pavone@retrodev.com>
parents: 2164
diff changeset
248 "Richo #4",
0d1d5dccdd28 Initial implementation of oscilloscope debug view
Michael Pavone <pavone@retrodev.com>
parents: 2164
diff changeset
249 "Richo #5",
0d1d5dccdd28 Initial implementation of oscilloscope debug view
Michael Pavone <pavone@retrodev.com>
parents: 2164
diff changeset
250 "Richo #6",
0d1d5dccdd28 Initial implementation of oscilloscope debug view
Michael Pavone <pavone@retrodev.com>
parents: 2164
diff changeset
251 "Richo #7",
0d1d5dccdd28 Initial implementation of oscilloscope debug view
Michael Pavone <pavone@retrodev.com>
parents: 2164
diff changeset
252 "Richo #8",
0d1d5dccdd28 Initial implementation of oscilloscope debug view
Michael Pavone <pavone@retrodev.com>
parents: 2164
diff changeset
253 };
0d1d5dccdd28 Initial implementation of oscilloscope debug view
Michael Pavone <pavone@retrodev.com>
parents: 2164
diff changeset
254 pcm->scope = scope;
0d1d5dccdd28 Initial implementation of oscilloscope debug view
Michael Pavone <pavone@retrodev.com>
parents: 2164
diff changeset
255 for (int i = 0; i < 8; i ++)
0d1d5dccdd28 Initial implementation of oscilloscope debug view
Michael Pavone <pavone@retrodev.com>
parents: 2164
diff changeset
256 {
0d1d5dccdd28 Initial implementation of oscilloscope debug view
Michael Pavone <pavone@retrodev.com>
parents: 2164
diff changeset
257 pcm->channels[i].scope_channel = scope_add_channel(scope, names[i], 50000000 / (pcm->clock_step * 96));
0d1d5dccdd28 Initial implementation of oscilloscope debug view
Michael Pavone <pavone@retrodev.com>
parents: 2164
diff changeset
258 }
0d1d5dccdd28 Initial implementation of oscilloscope debug view
Michael Pavone <pavone@retrodev.com>
parents: 2164
diff changeset
259 }