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annotate rf5c164.c @ 2153:8a30e44e8223

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Minor CDC fix
author Michael Pavone <pavone@retrodev.com>
date Wed, 06 Apr 2022 22:46:20 -0700
parents 62a53c052d9b
children 4fbe1e7c4a73
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 //48 cycles per channel
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32 //1 external write per 16 cycles
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33 //3 external writes per channel/sample
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34 // TCE pulse width is 200ns @ 10Mhz aka 2 cycles
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35 // total cycle is longer than TCE pulse, guessing 4 cycles
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36 // 12 memory access slots per channel sample
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37 // 3 for external memory writes
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38 // 1 for internal register writes?
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39 // 1 for refresh?
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40 // 6 for register reads?
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41 // or maybe 7 for register reads and writes happen when register is read?
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42
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43 #define CHECK pcm->cycle += pcm->clock_step; pcm->step++; if (pcm->cycle >= cycle) break
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44 #define CHECK_LOOP pcm->cycle += pcm->clock_step; pcm->step = 0; if (pcm->cycle >= cycle) break
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45
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46 static void write_if_not_sounding(rf5c164* pcm)
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47 {
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48 if (!(pcm->flags & FLAG_SOUNDING) && (pcm->flags & FLAG_PENDING)
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49 && pcm->pending_address >= 0x1000) {
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50 pcm->ram[(pcm->pending_address & 0xFFF) | pcm->ram_bank] = pcm->pending_byte;
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51 pcm->flags &= ~FLAG_PENDING;
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52 }
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53 }
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54
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55 static void write_always(rf5c164* pcm)
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56 {
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57 if ((pcm->flags & FLAG_PENDING) && pcm->pending_address >= 0x1000) {
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58 pcm->ram[(pcm->pending_address & 0xFFF) | pcm->ram_bank] = pcm->pending_byte;
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59 pcm->flags &= ~FLAG_PENDING;
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60 }
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61 }
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62
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63 void rf5c164_run(rf5c164* pcm, uint32_t cycle)
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64 {
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65 //TODO: Timing of this is all educated guesses based on documentation, do some real measurements
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66 while (pcm->cycle < cycle)
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67 {
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68 switch (pcm->step)
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69 {
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70 case 0:
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71 //handle internal memory write
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72 // RF5C164 datasheet seems to suggest only 1 "internal memory" write every 48 cycles when the chip is not sounding (globally)
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73 // 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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74 // RF5C68 datasheet suggests internal memory writes are unrestricted regardless of sounding status
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75 /*if ((pcm->cur_channel == pcm->selected_channel || !(pcm->flags & FLAG_SOUNDING)) && (pcm->flags & FLAG_PENDING)
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76 && pcm->pending_address <= ST
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77 ) {
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78 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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79 pcm->channels[pcm->selected_channel].regs[pcm->pending_address] = pcm->pending_byte;
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80 pcm->flags &= ~FLAG_PENDING;
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81 }*/
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82 write_if_not_sounding(pcm);
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83 CHECK;
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84 case 1:
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85 if ((pcm->flags & FLAG_SOUNDING) && !(pcm->channel_enable & (1 << pcm->cur_channel))) {
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86 if (pcm->channels[pcm->cur_channel].state == START) {
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87 pcm->channels[pcm->cur_channel].cur_ptr = pcm->channels[pcm->cur_channel].regs[ST] << 19;
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88 //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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89 pcm->channels[pcm->cur_channel].state = NORMAL;
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90 } else if (pcm->channels[pcm->cur_channel].state == LOOP) {
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91 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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92 //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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93 pcm->channels[pcm->cur_channel].state = NORMAL;
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94 }
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95 }
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96 write_if_not_sounding(pcm);
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97 CHECK;
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98 case 2: {
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99 if ((pcm->flags & FLAG_SOUNDING) && !(pcm->channel_enable & (1 << pcm->cur_channel))) {
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100 uint8_t byte = pcm->ram[pcm->channels[pcm->cur_channel].cur_ptr >> 11];
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101 if (byte == 0xFF) {
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102 pcm->channels[pcm->cur_channel].state = LOOP;
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103 } else {
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104 pcm->channels[pcm->cur_channel].sample = byte;
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105 }
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106 }
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107 write_if_not_sounding(pcm);
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108 CHECK;
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109 }
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110 case 3:
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111 write_always(pcm);
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112 CHECK;
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113 case 4:
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114 if ((pcm->flags & FLAG_SOUNDING) && !(pcm->channel_enable & (1 << pcm->cur_channel))) {
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115 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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116 pcm->channels[pcm->cur_channel].cur_ptr &= 0x7FFFFFF;
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117 }
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118 write_if_not_sounding(pcm);
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119 CHECK;
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120 case 5:
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121 write_if_not_sounding(pcm);
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122 CHECK;
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123 case 6:
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124 write_if_not_sounding(pcm);
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125 CHECK;
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126 case 7:
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127 write_always(pcm);
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128 CHECK;
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129 case 8:
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130 write_if_not_sounding(pcm);
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131 CHECK;
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132 case 9:
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133 if ((pcm->flags & FLAG_SOUNDING) && !(pcm->channel_enable & (1 << pcm->cur_channel))) {
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134 int16_t sample = pcm->channels[pcm->cur_channel].sample & 0x7F;
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135 if (!(pcm->channels[pcm->cur_channel].sample & 0x80)) {
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136 sample = -sample;
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137 }
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138 sample *= pcm->channels[pcm->cur_channel].regs[ENV];
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139 int16_t left = (sample * (pcm->channels[pcm->cur_channel].regs[PAN] >> 4)) >> 5;
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140 int16_t right = (sample * (pcm->channels[pcm->cur_channel].regs[PAN] & 0xF)) >> 5;
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141 //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);
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142 pcm->left += left;
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143 pcm->right += right;
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144 }
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145 write_if_not_sounding(pcm);
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146 CHECK;
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147 case 10:
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148 //refresh?
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149 //does refresh happen at the same rate when sounding disabled? warning in sega docs suggests maybe not
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150 write_if_not_sounding(pcm);
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151 CHECK;
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152 case 11:
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153 write_always(pcm);
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154 pcm->cur_channel++;
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155 pcm->cur_channel &= 7;
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156 if (!pcm->cur_channel) {
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157 if (pcm->left > INT16_MAX) {
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158 pcm->left = INT16_MAX;
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159 } else if (pcm->left < INT16_MIN) {
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160 pcm->left = INT16_MIN;
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161 }
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162 if (pcm->right > INT16_MAX) {
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163 pcm->right = INT16_MAX;
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164 } else if (pcm->right < INT16_MIN) {
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165 pcm->right = INT16_MIN;
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166 }
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167 render_put_stereo_sample(pcm->audio, pcm->left, pcm->right);
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168 pcm->left = pcm->right = 0;
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169 }
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170 CHECK_LOOP;
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171 }
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172 }
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173 }
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174
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175 void rf5c164_write(rf5c164* pcm, uint16_t address, uint8_t value)
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176 {
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177 //printf("pcm_write %X - %X @ %u\n", address, value, pcm->cycle);
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178 if (address == CTRL) {
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179 pcm->flags &= ~FLAG_SOUNDING;
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180 pcm->flags |= value & FLAG_SOUNDING;
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181 if (value & 0x40) {
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182 pcm->selected_channel = value & 0x7;
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183 //printf("selected channel %d\n", pcm->selected_channel);
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184 } else {
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185 pcm->ram_bank = value << 12 & 0xF000;
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186 //printf("selected RAM bank %X\n", pcm->ram_bank);
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187 }
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188 if (!(pcm->flags & FLAG_SOUNDING)) {
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189 pcm->left = pcm->right = 0;
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190 }
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191 } else if (address == CHAN_ENABLE) {
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192 uint8_t changed = pcm->channel_enable ^ value;
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193 pcm->channel_enable = value;
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194 for (int i = 0; i < 8; i++)
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195 {
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196 int mask = 1 << i;
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197 if ((changed & mask) && !(mask & value)) {
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198 pcm->channels[i].state = START;
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199 }
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200 }
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201 } else if (address <= ST) {
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202 //See note in first step of rf5c164_run
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203 pcm->channels[pcm->selected_channel].regs[address] = value;
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204 } else {
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205 pcm->pending_address = address;
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206 pcm->pending_byte = value;
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207 pcm->flags |= FLAG_PENDING;
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208 }
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209 }
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210
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211 uint8_t rf5c164_read(rf5c164* pcm, uint16_t address)
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212 {
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213 if (address >= 0x10 && address < 0x20) {
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214 uint16_t chan = address >> 1 & 0x7;
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215 if (address & 1) {
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216 return pcm->channels[chan].cur_ptr >> 19;
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217 } else {
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218 return pcm->channels[chan].cur_ptr >> 11;
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219 }
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220 } else if (address >= 0x1000 && !(pcm->flags & FLAG_SOUNDING)) {
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221 return pcm->ram[pcm->ram_bank | (address & 0xFFF)];
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222 } else {
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223 return 0xFF;
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224 }
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225 }