Mercurial > repos > blastem
annotate rf5c164.c @ 2166:3a6680e9204a
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author | Michael Pavone <pavone@retrodev.com> |
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date | Sat, 23 Jul 2022 10:54:07 -0700 |
parents | 4fbe1e7c4a73 |
children | 0d1d5dccdd28 |
rev | line source |
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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 |
2082
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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 } else if (pcm->channels[pcm->cur_channel].state == LOOP) { |
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96 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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97 //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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98 pcm->channels[pcm->cur_channel].state = NORMAL; |
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99 } |
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100 } |
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101 write_if_not_sounding(pcm); |
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102 CHECK; |
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103 case 2: { |
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104 if ((pcm->flags & FLAG_SOUNDING) && !(pcm->channel_enable & (1 << pcm->cur_channel))) { |
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105 uint8_t byte = pcm->ram[pcm->channels[pcm->cur_channel].cur_ptr >> 11]; |
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106 if (byte == 0xFF) { |
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107 pcm->channels[pcm->cur_channel].state = LOOP; |
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108 } else { |
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109 pcm->channels[pcm->cur_channel].sample = byte; |
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110 } |
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111 } |
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112 write_if_not_sounding(pcm); |
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113 CHECK; |
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114 } |
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115 case 3: |
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116 write_always(pcm); |
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117 CHECK; |
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118 case 4: |
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119 if ((pcm->flags & FLAG_SOUNDING) && !(pcm->channel_enable & (1 << pcm->cur_channel))) { |
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120 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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121 pcm->channels[pcm->cur_channel].cur_ptr &= 0x7FFFFFF; |
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122 } |
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123 write_if_not_sounding(pcm); |
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124 CHECK; |
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125 case 5: |
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126 write_if_not_sounding(pcm); |
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127 CHECK; |
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128 case 6: |
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129 write_if_not_sounding(pcm); |
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130 CHECK; |
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131 case 7: |
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132 write_always(pcm); |
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133 CHECK; |
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134 case 8: |
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135 write_if_not_sounding(pcm); |
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136 CHECK; |
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137 case 9: |
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138 if ((pcm->flags & FLAG_SOUNDING) && !(pcm->channel_enable & (1 << pcm->cur_channel))) { |
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139 int16_t sample = pcm->channels[pcm->cur_channel].sample & 0x7F; |
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140 if (!(pcm->channels[pcm->cur_channel].sample & 0x80)) { |
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141 sample = -sample; |
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142 } |
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143 sample *= pcm->channels[pcm->cur_channel].regs[ENV]; |
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144 int16_t left = (sample * (pcm->channels[pcm->cur_channel].regs[PAN] >> 4)) >> 5; |
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145 int16_t right = (sample * (pcm->channels[pcm->cur_channel].regs[PAN] & 0xF)) >> 5; |
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146 //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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147 pcm->left += left; |
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148 pcm->right += right; |
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149 } |
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150 write_if_not_sounding(pcm); |
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151 CHECK; |
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152 case 10: |
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153 //refresh? |
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154 //does refresh happen at the same rate when sounding disabled? warning in sega docs suggests maybe not |
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155 write_if_not_sounding(pcm); |
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156 CHECK; |
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157 case 11: |
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158 write_always(pcm); |
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159 pcm->cur_channel++; |
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160 pcm->cur_channel &= 7; |
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161 if (!pcm->cur_channel) { |
2145
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2128
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162 if (pcm->left > INT16_MAX) { |
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163 pcm->left = INT16_MAX; |
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164 } else if (pcm->left < INT16_MIN) { |
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165 pcm->left = INT16_MIN; |
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166 } |
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167 if (pcm->right > INT16_MAX) { |
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168 pcm->right = INT16_MAX; |
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169 } else if (pcm->right < INT16_MIN) { |
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170 pcm->right = INT16_MIN; |
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171 } |
2082
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172 render_put_stereo_sample(pcm->audio, pcm->left, pcm->right); |
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173 pcm->left = pcm->right = 0; |
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174 } |
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175 CHECK_LOOP; |
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176 } |
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177 } |
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178 } |
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179 |
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180 void rf5c164_write(rf5c164* pcm, uint16_t address, uint8_t value) |
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181 { |
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182 //printf("pcm_write %X - %X @ %u\n", address, value, pcm->cycle); |
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183 if (address == CTRL) { |
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184 pcm->flags &= ~FLAG_SOUNDING; |
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185 pcm->flags |= value & FLAG_SOUNDING; |
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186 if (value & 0x40) { |
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187 pcm->selected_channel = value & 0x7; |
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188 //printf("selected channel %d\n", pcm->selected_channel); |
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189 } else { |
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190 pcm->ram_bank = value << 12 & 0xF000; |
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191 //printf("selected RAM bank %X\n", pcm->ram_bank); |
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192 } |
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193 if (!(pcm->flags & FLAG_SOUNDING)) { |
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194 pcm->left = pcm->right = 0; |
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195 } |
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196 } else if (address == CHAN_ENABLE) { |
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197 uint8_t changed = pcm->channel_enable ^ value; |
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198 pcm->channel_enable = value; |
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199 for (int i = 0; i < 8; i++) |
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|
200 { |
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201 int mask = 1 << i; |
2145
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2128
diff
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|
202 if ((changed & mask) && !(mask & value)) { |
2082
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|
203 pcm->channels[i].state = START; |
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204 } |
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|
205 } |
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206 } else if (address <= ST) { |
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207 //See note in first step of rf5c164_run |
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208 pcm->channels[pcm->selected_channel].regs[address] = value; |
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diff
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|
209 } else { |
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|
210 pcm->pending_address = address; |
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|
211 pcm->pending_byte = value; |
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|
212 pcm->flags |= FLAG_PENDING; |
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|
213 } |
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|
214 } |
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diff
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|
215 |
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diff
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|
216 uint8_t rf5c164_read(rf5c164* pcm, uint16_t address) |
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diff
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|
217 { |
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|
218 if (address >= 0x10 && address < 0x20) { |
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diff
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|
219 uint16_t chan = address >> 1 & 0x7; |
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diff
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|
220 if (address & 1) { |
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diff
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|
221 return pcm->channels[chan].cur_ptr >> 19; |
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diff
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|
222 } else { |
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diff
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|
223 return pcm->channels[chan].cur_ptr >> 11; |
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diff
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|
224 } |
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|
225 } else if (address >= 0x1000 && !(pcm->flags & FLAG_SOUNDING)) { |
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parents:
diff
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|
226 return pcm->ram[pcm->ram_bank | (address & 0xFFF)]; |
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diff
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|
227 } else { |
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parents:
diff
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|
228 return 0xFF; |
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parents:
diff
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|
229 } |
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|
230 } |