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annotate lc8951.c @ 2342:9f0c67e5c50a

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Implement CD-ROM data sector scrambling/descrambling
author Michael Pavone <pavone@retrodev.com>
date Sun, 01 Oct 2023 23:39:48 -0700
parents 9ead0fe69d9b
children f8b5142c06aa
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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2058
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1 #include "lc8951.h"
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2 #include "backend.h"
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3 #include "cdimage.h"
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4
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5 enum {
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6 COMIN,
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7 IFSTAT,
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8 DBCL,
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9 DBCH,
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10 HEAD0,
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11 HEAD1,
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12 HEAD2,
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13 HEAD3,
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14 PTL,
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15 PTH,
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16 WAL,
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17 WAH,
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18 STAT0,
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19 STAT1,
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20 STAT2,
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21 STAT3,
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22
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23 SBOUT = COMIN,
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24 IFCTRL = IFSTAT,
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25 DACL = HEAD0,
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26 DACH = HEAD1,
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27 DTTRG = HEAD2,
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28 DTACK = HEAD3,
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29 WAL_WRITE = PTL,
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30 WAH_WRITE = PTH,
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31 CTRL0 = WAL,
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32 CTRL1 = WAH,
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33 PTL_WRITE = STAT0,
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34 PTH_WRITE = STAT1,
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35 RESET = STAT3
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36 };
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37
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38 //IFCTRL
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39 #define BIT_CMDIEN 0x80
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40 #define BIT_DTEIEN 0x40
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41 #define BIT_DECIEN 0x20
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42 #define BIT_CMDBK 0x10
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43 #define BIT_DTWAI 0x08
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44 #define BIT_STWAI 0x04
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45 #define BIT_DOUTEN 0x02
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46 #define BIT_SOUTEN 0x01
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47
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48 //IFSTAT
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49 #define BIT_CMDI 0x80
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50 #define BIT_DTEI 0x40
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51 #define BIT_DECI 0x20
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52 #define BIT_DTBSY 0x08
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53 #define BIT_STBSY 0x04
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54 #define BIT_DTEN 0x02
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55 #define BIT_STEN 0x01
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56
2062
07ed42bd7b4c Some progress on CDC and CDD emulation. Now passes first 3 "CDC INIT" tests in mcd-verificator
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parents: 2058
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57 //CTRL0
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58 #define BIT_DECEN 0x80
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59 #define BIT_WRRQ 0x04
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60 #define BIT_ORQ 0x02
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61 #define BIT_PRQ 0x01
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62
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63 //CTRL1
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64 #define BIT_SYIEN 0x80
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65 #define BIT_SYDEN 0x40
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66 #define BIT_DSCREN 0x20
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07ed42bd7b4c Some progress on CDC and CDD emulation. Now passes first 3 "CDC INIT" tests in mcd-verificator
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67
2067
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68 //STAT0
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69 #define BIT_CRCOK 0x80
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70 #define BIT_ILSYNC 0x40
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71 #define BIT_NOSYNC 0x20
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72 #define BIT_LBLK 0x10
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73 #define BIT_SBLK 0x04
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74 #define BIT_UCEBLK 0x01
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75
2062
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parents: 2058
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76 //STAT3
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77 #define BIT_VALST 0x80
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78 #define BIT_WLONG 0x40
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79
2058
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80 //datasheet timing info
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81 //3 cycles for memory operation
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82 //6 cycles min for DMA-mode host transfer
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83
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84 void lc8951_init(lc8951 *context, lcd8951_byte_recv_fun byte_handler, void *handler_data)
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85 {
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86 //This seems to vary somewhat between Sega CD models
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87 //unclear if the difference is in the lc8951 or gate array
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88 context->regs[IFSTAT] = 0xFF;
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89 context->ar_mask = 0x1F;
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90 context->clock_step = (2 + 2); // external divider, internal divider
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91 context->cycles_per_byte = context->clock_step * 6;
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92 context->byte_handler = byte_handler;
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93 context->handler_data = handler_data;
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94 context->decode_end = CYCLE_NEVER;
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95 context->transfer_end = CYCLE_NEVER;
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96 context->next_byte_cycle = CYCLE_NEVER;
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97 }
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98
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99 void lc8951_set_dma_multiple(lc8951 *context, uint32_t multiple)
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100 {
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101 context->cycles_per_byte = context->clock_step * multiple;
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102 if (context->transfer_end != CYCLE_NEVER) {
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103 uint16_t transfer_size = context->regs[DBCL] | (context->regs[DBCH] << 8);
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104 context->transfer_end = context->next_byte_cycle + transfer_size * context->cycles_per_byte;
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105 }
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106 }
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107
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108 void lc8951_reg_write(lc8951 *context, uint8_t value)
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109 {
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110 switch (context->ar)
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111 {
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112 case SBOUT:
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113 context->regs[context->ar] = value;
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114 if (context->ifctrl & BIT_SOUTEN) {
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115 context->regs[IFSTAT] &= ~BIT_STBSY;
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116 }
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117 break;
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118 case IFCTRL:
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119 context->ifctrl = value;
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120 if (!(value & BIT_SOUTEN)) {
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121 context->regs[IFSTAT] |= BIT_STBSY;
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122 }
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123 if (!(value & BIT_DOUTEN)) {
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124 context->regs[IFSTAT] |= BIT_DTBSY|BIT_DTEI;
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125 context->transfer_end = CYCLE_NEVER;
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126 }
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127 break;
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128 case DBCL:
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129 context->regs[context->ar] = value;
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130 break;
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131 case DBCH:
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132 context->regs[context->ar] = value & 0xF;
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133 break;
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134 case DACL:
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135 context->dac &= 0xFF00;
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136 context->dac |= value;
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137 break;
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138 case DACH:
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139 context->dac &= 0xFF;
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140 context->dac |= value << 8;
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141 break;
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142 case DTTRG:
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143 if (context->ifctrl & BIT_DOUTEN) {
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144 context->regs[IFSTAT] &= ~BIT_DTBSY;
2062
07ed42bd7b4c Some progress on CDC and CDD emulation. Now passes first 3 "CDC INIT" tests in mcd-verificator
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145 uint16_t transfer_size = context->regs[DBCL] | (context->regs[DBCH] << 8);
2144
10e4439d8f13 Fix speed of CDC to PCM RAM DMA
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146 context->transfer_end = context->cycle + transfer_size * context->cycles_per_byte;
10e4439d8f13 Fix speed of CDC to PCM RAM DMA
Michael Pavone <pavone@retrodev.com>
parents: 2142
diff changeset
147 context->next_byte_cycle = context->cycle;
2231
8e6fb2c06024 Fix CDC transfer regression
Michael Pavone <pavone@retrodev.com>
parents: 2153
diff changeset
148 context->triggered = 1;
2065
02a9846668d1 Implement transfer of data from CDC to elsewhere. Other miscellaneous CDD/CDC improvements
Michael Pavone <pavone@retrodev.com>
parents: 2062
diff changeset
149 printf("DTTRG: size %u, cycle %u, end %u\n", transfer_size, context->cycle, context->transfer_end);
2058
70260f6051dd Initial work on CDC emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
150 }
70260f6051dd Initial work on CDC emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
151 break;
70260f6051dd Initial work on CDC emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
152 case DTACK:
70260f6051dd Initial work on CDC emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
153 context->regs[IFSTAT] |= BIT_DTEI;
70260f6051dd Initial work on CDC emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
154 break;
70260f6051dd Initial work on CDC emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
155 case WAL_WRITE:
70260f6051dd Initial work on CDC emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
156 context->regs[WAL] = value;
70260f6051dd Initial work on CDC emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
157 break;
70260f6051dd Initial work on CDC emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
158 case WAH_WRITE:
70260f6051dd Initial work on CDC emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
159 context->regs[WAH] = value;
70260f6051dd Initial work on CDC emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
160 break;
2062
07ed42bd7b4c Some progress on CDC and CDD emulation. Now passes first 3 "CDC INIT" tests in mcd-verificator
Michael Pavone <pavone@retrodev.com>
parents: 2058
diff changeset
161 case CTRL0:
07ed42bd7b4c Some progress on CDC and CDD emulation. Now passes first 3 "CDC INIT" tests in mcd-verificator
Michael Pavone <pavone@retrodev.com>
parents: 2058
diff changeset
162 context->ctrl0 = value;
07ed42bd7b4c Some progress on CDC and CDD emulation. Now passes first 3 "CDC INIT" tests in mcd-verificator
Michael Pavone <pavone@retrodev.com>
parents: 2058
diff changeset
163 break;
07ed42bd7b4c Some progress on CDC and CDD emulation. Now passes first 3 "CDC INIT" tests in mcd-verificator
Michael Pavone <pavone@retrodev.com>
parents: 2058
diff changeset
164 case CTRL1:
07ed42bd7b4c Some progress on CDC and CDD emulation. Now passes first 3 "CDC INIT" tests in mcd-verificator
Michael Pavone <pavone@retrodev.com>
parents: 2058
diff changeset
165 context->ctrl1 = value;
07ed42bd7b4c Some progress on CDC and CDD emulation. Now passes first 3 "CDC INIT" tests in mcd-verificator
Michael Pavone <pavone@retrodev.com>
parents: 2058
diff changeset
166 break;
2058
70260f6051dd Initial work on CDC emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
167 case PTL_WRITE:
70260f6051dd Initial work on CDC emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
168 context->regs[PTL] = value;
70260f6051dd Initial work on CDC emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
169 break;
70260f6051dd Initial work on CDC emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
170 case PTH_WRITE:
70260f6051dd Initial work on CDC emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
171 context->regs[PTH] = value;
2067
f22e04b69272 More CDC/CDD improvements
Michael Pavone <pavone@retrodev.com>
parents: 2066
diff changeset
172 //TODO: Datasheet says any write to PT triggers a decode, but initial tests suggest that's not the case
f22e04b69272 More CDC/CDD improvements
Michael Pavone <pavone@retrodev.com>
parents: 2066
diff changeset
173 //Need to do more tests with other CTRL0/CTRL1 settings
f22e04b69272 More CDC/CDD improvements
Michael Pavone <pavone@retrodev.com>
parents: 2066
diff changeset
174 //context->decode_end = context->cycle + 2352 * context->clock_step * 4;
2058
70260f6051dd Initial work on CDC emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
175 break;
70260f6051dd Initial work on CDC emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
176 case RESET:
70260f6051dd Initial work on CDC emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
177 context->comin_count = 0;
70260f6051dd Initial work on CDC emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
178 context->regs[IFSTAT] = 0xFF;
2080
bafb757e1cd2 Implement CD audio
Michael Pavone <pavone@retrodev.com>
parents: 2073
diff changeset
179 context->ifctrl = 0;
bafb757e1cd2 Implement CD audio
Michael Pavone <pavone@retrodev.com>
parents: 2073
diff changeset
180 context->ctrl0 = 0;
bafb757e1cd2 Implement CD audio
Michael Pavone <pavone@retrodev.com>
parents: 2073
diff changeset
181 context->ctrl1 = 0;
2058
70260f6051dd Initial work on CDC emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
182 break;
70260f6051dd Initial work on CDC emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
183 default:
70260f6051dd Initial work on CDC emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
184 break;
70260f6051dd Initial work on CDC emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
185 }
70260f6051dd Initial work on CDC emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
186 if (context->ar != SBOUT) {
70260f6051dd Initial work on CDC emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
187 context->ar++;
70260f6051dd Initial work on CDC emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
188 context->ar &= context->ar_mask;
70260f6051dd Initial work on CDC emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
189 }
70260f6051dd Initial work on CDC emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
190 }
70260f6051dd Initial work on CDC emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
191
70260f6051dd Initial work on CDC emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
192 uint8_t lc8951_reg_read(lc8951 *context)
70260f6051dd Initial work on CDC emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
193 {
70260f6051dd Initial work on CDC emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
194 uint8_t value;
70260f6051dd Initial work on CDC emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
195 if (context->ar == COMIN) {
70260f6051dd Initial work on CDC emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
196 if (!context->comin_count) {
70260f6051dd Initial work on CDC emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
197 return 0xFF;
70260f6051dd Initial work on CDC emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
198 }
70260f6051dd Initial work on CDC emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
199 value = context->comin[(context->comin_write - context->comin_count)&sizeof(context->comin)];
70260f6051dd Initial work on CDC emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
200 context->comin_count--;
70260f6051dd Initial work on CDC emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
201 if (!context->comin_count) {
70260f6051dd Initial work on CDC emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
202 context->regs[IFSTAT] |= BIT_CMDI;
70260f6051dd Initial work on CDC emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
203 }
70260f6051dd Initial work on CDC emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
204 return value;
70260f6051dd Initial work on CDC emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
205 }
70260f6051dd Initial work on CDC emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
206 if (context->ar == STAT3) {
70260f6051dd Initial work on CDC emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
207 context->regs[IFSTAT] |= BIT_DECI;
70260f6051dd Initial work on CDC emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
208 }
70260f6051dd Initial work on CDC emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
209 if (context->ar >= sizeof(context->regs)) {
70260f6051dd Initial work on CDC emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
210 value = 0xFF;
70260f6051dd Initial work on CDC emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
211 } else {
70260f6051dd Initial work on CDC emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
212 value = context->regs[context->ar];
70260f6051dd Initial work on CDC emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
213 }
2062
07ed42bd7b4c Some progress on CDC and CDD emulation. Now passes first 3 "CDC INIT" tests in mcd-verificator
Michael Pavone <pavone@retrodev.com>
parents: 2058
diff changeset
214 printf("CDC read %X: %X\n", context->ar, value);
2058
70260f6051dd Initial work on CDC emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
215 context->ar++;
70260f6051dd Initial work on CDC emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
216 context->ar &= context->ar_mask;
70260f6051dd Initial work on CDC emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
217 return value;
70260f6051dd Initial work on CDC emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
218 }
70260f6051dd Initial work on CDC emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
219
70260f6051dd Initial work on CDC emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
220 void lc8951_ar_write(lc8951 *context, uint8_t value)
70260f6051dd Initial work on CDC emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
221 {
70260f6051dd Initial work on CDC emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
222 context->ar = value & context->ar_mask;
70260f6051dd Initial work on CDC emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
223 }
2062
07ed42bd7b4c Some progress on CDC and CDD emulation. Now passes first 3 "CDC INIT" tests in mcd-verificator
Michael Pavone <pavone@retrodev.com>
parents: 2058
diff changeset
224
07ed42bd7b4c Some progress on CDC and CDD emulation. Now passes first 3 "CDC INIT" tests in mcd-verificator
Michael Pavone <pavone@retrodev.com>
parents: 2058
diff changeset
225 //25 MHz clock input (1/2 SCD MCLK)
07ed42bd7b4c Some progress on CDC and CDD emulation. Now passes first 3 "CDC INIT" tests in mcd-verificator
Michael Pavone <pavone@retrodev.com>
parents: 2058
diff changeset
226 //internal /2 divider
07ed42bd7b4c Some progress on CDC and CDD emulation. Now passes first 3 "CDC INIT" tests in mcd-verificator
Michael Pavone <pavone@retrodev.com>
parents: 2058
diff changeset
227 //3 cycles for each SRAM access (though might be crystal frequency rather than internal frequency)
07ed42bd7b4c Some progress on CDC and CDD emulation. Now passes first 3 "CDC INIT" tests in mcd-verificator
Michael Pavone <pavone@retrodev.com>
parents: 2058
diff changeset
228 //6 cycle period for DMA transfer out
07ed42bd7b4c Some progress on CDC and CDD emulation. Now passes first 3 "CDC INIT" tests in mcd-verificator
Michael Pavone <pavone@retrodev.com>
parents: 2058
diff changeset
229 //
07ed42bd7b4c Some progress on CDC and CDD emulation. Now passes first 3 "CDC INIT" tests in mcd-verificator
Michael Pavone <pavone@retrodev.com>
parents: 2058
diff changeset
230
07ed42bd7b4c Some progress on CDC and CDD emulation. Now passes first 3 "CDC INIT" tests in mcd-verificator
Michael Pavone <pavone@retrodev.com>
parents: 2058
diff changeset
231 void lc8951_run(lc8951 *context, uint32_t cycle)
07ed42bd7b4c Some progress on CDC and CDD emulation. Now passes first 3 "CDC INIT" tests in mcd-verificator
Michael Pavone <pavone@retrodev.com>
parents: 2058
diff changeset
232 {
07ed42bd7b4c Some progress on CDC and CDD emulation. Now passes first 3 "CDC INIT" tests in mcd-verificator
Michael Pavone <pavone@retrodev.com>
parents: 2058
diff changeset
233 for(; context->cycle < cycle; context->cycle += context->clock_step)
07ed42bd7b4c Some progress on CDC and CDD emulation. Now passes first 3 "CDC INIT" tests in mcd-verificator
Michael Pavone <pavone@retrodev.com>
parents: 2058
diff changeset
234 {
07ed42bd7b4c Some progress on CDC and CDD emulation. Now passes first 3 "CDC INIT" tests in mcd-verificator
Michael Pavone <pavone@retrodev.com>
parents: 2058
diff changeset
235 if (context->cycle >= context->decode_end) {
07ed42bd7b4c Some progress on CDC and CDD emulation. Now passes first 3 "CDC INIT" tests in mcd-verificator
Michael Pavone <pavone@retrodev.com>
parents: 2058
diff changeset
236 context->decode_end = CYCLE_NEVER;
07ed42bd7b4c Some progress on CDC and CDD emulation. Now passes first 3 "CDC INIT" tests in mcd-verificator
Michael Pavone <pavone@retrodev.com>
parents: 2058
diff changeset
237 context->regs[IFSTAT] &= ~BIT_DECI;
07ed42bd7b4c Some progress on CDC and CDD emulation. Now passes first 3 "CDC INIT" tests in mcd-verificator
Michael Pavone <pavone@retrodev.com>
parents: 2058
diff changeset
238 context->regs[STAT3] &= ~BIT_VALST;
2067
f22e04b69272 More CDC/CDD improvements
Michael Pavone <pavone@retrodev.com>
parents: 2066
diff changeset
239 if (context->ctrl0 & BIT_WRRQ) {
f22e04b69272 More CDC/CDD improvements
Michael Pavone <pavone@retrodev.com>
parents: 2066
diff changeset
240 uint16_t block_start = (context->regs[PTL] | (context->regs[PTH] << 8)) & (sizeof(context->buffer)-1);
f22e04b69272 More CDC/CDD improvements
Michael Pavone <pavone@retrodev.com>
parents: 2066
diff changeset
241 for (int reg = HEAD0; reg < PTL; reg++)
f22e04b69272 More CDC/CDD improvements
Michael Pavone <pavone@retrodev.com>
parents: 2066
diff changeset
242 {
f22e04b69272 More CDC/CDD improvements
Michael Pavone <pavone@retrodev.com>
parents: 2066
diff changeset
243 context->regs[reg] =context->buffer[block_start++];
f22e04b69272 More CDC/CDD improvements
Michael Pavone <pavone@retrodev.com>
parents: 2066
diff changeset
244 block_start &= (sizeof(context->buffer)-1);
f22e04b69272 More CDC/CDD improvements
Michael Pavone <pavone@retrodev.com>
parents: 2066
diff changeset
245 }
2062
07ed42bd7b4c Some progress on CDC and CDD emulation. Now passes first 3 "CDC INIT" tests in mcd-verificator
Michael Pavone <pavone@retrodev.com>
parents: 2058
diff changeset
246 }
07ed42bd7b4c Some progress on CDC and CDD emulation. Now passes first 3 "CDC INIT" tests in mcd-verificator
Michael Pavone <pavone@retrodev.com>
parents: 2058
diff changeset
247 printf("Decode done %X:%X:%X mode %X\n", context->regs[HEAD0], context->regs[HEAD1], context->regs[HEAD2], context->regs[HEAD3]);
2142
d9151d0894c7 Fix some CD-ROM emulation issues
Michael Pavone <pavone@retrodev.com>
parents: 2131
diff changeset
248 // This check is a hack until I properly implement error detection
d9151d0894c7 Fix some CD-ROM emulation issues
Michael Pavone <pavone@retrodev.com>
parents: 2131
diff changeset
249 if (context->regs[HEAD0] < 0x74 && (context->regs[HEAD0] & 0xF) < 0xA
d9151d0894c7 Fix some CD-ROM emulation issues
Michael Pavone <pavone@retrodev.com>
parents: 2131
diff changeset
250 && context->regs[HEAD1] < 0x60 && (context->regs[HEAD1] & 0xF) < 0xA
d9151d0894c7 Fix some CD-ROM emulation issues
Michael Pavone <pavone@retrodev.com>
parents: 2131
diff changeset
251 && context->regs[HEAD2] < 0x75 && (context->regs[HEAD2] & 0xF) < 0xA
d9151d0894c7 Fix some CD-ROM emulation issues
Michael Pavone <pavone@retrodev.com>
parents: 2131
diff changeset
252 && context->regs[HEAD3] < 3 && !(context->regs[STAT0] & (BIT_NOSYNC|BIT_ILSYNC))
d9151d0894c7 Fix some CD-ROM emulation issues
Michael Pavone <pavone@retrodev.com>
parents: 2131
diff changeset
253 ) {
d9151d0894c7 Fix some CD-ROM emulation issues
Michael Pavone <pavone@retrodev.com>
parents: 2131
diff changeset
254
2153
8a30e44e8223 Minor CDC fix
Michael Pavone <pavone@retrodev.com>
parents: 2147
diff changeset
255 if (context->ctrl0 & (BIT_WRRQ|BIT_ORQ|BIT_PRQ)) {
2142
d9151d0894c7 Fix some CD-ROM emulation issues
Michael Pavone <pavone@retrodev.com>
parents: 2131
diff changeset
256 context->regs[STAT0] |= BIT_CRCOK;
d9151d0894c7 Fix some CD-ROM emulation issues
Michael Pavone <pavone@retrodev.com>
parents: 2131
diff changeset
257 }
d9151d0894c7 Fix some CD-ROM emulation issues
Michael Pavone <pavone@retrodev.com>
parents: 2131
diff changeset
258 context->regs[STAT1] = 0;
2153
8a30e44e8223 Minor CDC fix
Michael Pavone <pavone@retrodev.com>
parents: 2147
diff changeset
259 context->regs[STAT2] = 0x10;
2142
d9151d0894c7 Fix some CD-ROM emulation issues
Michael Pavone <pavone@retrodev.com>
parents: 2131
diff changeset
260 } else {
2153
8a30e44e8223 Minor CDC fix
Michael Pavone <pavone@retrodev.com>
parents: 2147
diff changeset
261 if (context->ctrl0 & (BIT_WRRQ|BIT_ORQ|BIT_PRQ)) {
2142
d9151d0894c7 Fix some CD-ROM emulation issues
Michael Pavone <pavone@retrodev.com>
parents: 2131
diff changeset
262 context->regs[STAT0] |= BIT_UCEBLK;
d9151d0894c7 Fix some CD-ROM emulation issues
Michael Pavone <pavone@retrodev.com>
parents: 2131
diff changeset
263 }
d9151d0894c7 Fix some CD-ROM emulation issues
Michael Pavone <pavone@retrodev.com>
parents: 2131
diff changeset
264 context->regs[STAT1] = 0xFF;
d9151d0894c7 Fix some CD-ROM emulation issues
Michael Pavone <pavone@retrodev.com>
parents: 2131
diff changeset
265 context->regs[STAT2] = 0xF2;
d9151d0894c7 Fix some CD-ROM emulation issues
Michael Pavone <pavone@retrodev.com>
parents: 2131
diff changeset
266 }
d9151d0894c7 Fix some CD-ROM emulation issues
Michael Pavone <pavone@retrodev.com>
parents: 2131
diff changeset
267 context->regs[STAT3] |= BIT_WLONG;
2062
07ed42bd7b4c Some progress on CDC and CDD emulation. Now passes first 3 "CDC INIT" tests in mcd-verificator
Michael Pavone <pavone@retrodev.com>
parents: 2058
diff changeset
268 }
2144
10e4439d8f13 Fix speed of CDC to PCM RAM DMA
Michael Pavone <pavone@retrodev.com>
parents: 2142
diff changeset
269 if (context->cycle >= context->next_byte_cycle) {
2065
02a9846668d1 Implement transfer of data from CDC to elsewhere. Other miscellaneous CDD/CDC improvements
Michael Pavone <pavone@retrodev.com>
parents: 2062
diff changeset
270 if (context->byte_handler(context->handler_data, context->buffer[context->dac & (sizeof(context->buffer)-1)])) {
2144
10e4439d8f13 Fix speed of CDC to PCM RAM DMA
Michael Pavone <pavone@retrodev.com>
parents: 2142
diff changeset
271 context->next_byte_cycle += context->cycles_per_byte;
2065
02a9846668d1 Implement transfer of data from CDC to elsewhere. Other miscellaneous CDD/CDC improvements
Michael Pavone <pavone@retrodev.com>
parents: 2062
diff changeset
272 context->dac++;
02a9846668d1 Implement transfer of data from CDC to elsewhere. Other miscellaneous CDD/CDC improvements
Michael Pavone <pavone@retrodev.com>
parents: 2062
diff changeset
273 context->regs[DBCL]--;
02a9846668d1 Implement transfer of data from CDC to elsewhere. Other miscellaneous CDD/CDC improvements
Michael Pavone <pavone@retrodev.com>
parents: 2062
diff changeset
274 if (context->regs[DBCL] == 0xFF) {
02a9846668d1 Implement transfer of data from CDC to elsewhere. Other miscellaneous CDD/CDC improvements
Michael Pavone <pavone@retrodev.com>
parents: 2062
diff changeset
275 context->regs[DBCH]--;
02a9846668d1 Implement transfer of data from CDC to elsewhere. Other miscellaneous CDD/CDC improvements
Michael Pavone <pavone@retrodev.com>
parents: 2062
diff changeset
276 if (context->regs[DBCH] == 0xFF) {
02a9846668d1 Implement transfer of data from CDC to elsewhere. Other miscellaneous CDD/CDC improvements
Michael Pavone <pavone@retrodev.com>
parents: 2062
diff changeset
277 context->regs[IFSTAT] &= ~BIT_DTEI;
02a9846668d1 Implement transfer of data from CDC to elsewhere. Other miscellaneous CDD/CDC improvements
Michael Pavone <pavone@retrodev.com>
parents: 2062
diff changeset
278 context->regs[IFSTAT] |= BIT_DTBSY;
02a9846668d1 Implement transfer of data from CDC to elsewhere. Other miscellaneous CDD/CDC improvements
Michael Pavone <pavone@retrodev.com>
parents: 2062
diff changeset
279 if (context->cycle != context->transfer_end) {
02a9846668d1 Implement transfer of data from CDC to elsewhere. Other miscellaneous CDD/CDC improvements
Michael Pavone <pavone@retrodev.com>
parents: 2062
diff changeset
280 printf("Expected transfer end at %u but ended at %u\n", context->transfer_end, context->cycle);
02a9846668d1 Implement transfer of data from CDC to elsewhere. Other miscellaneous CDD/CDC improvements
Michael Pavone <pavone@retrodev.com>
parents: 2062
diff changeset
281 }
02a9846668d1 Implement transfer of data from CDC to elsewhere. Other miscellaneous CDD/CDC improvements
Michael Pavone <pavone@retrodev.com>
parents: 2062
diff changeset
282 context->transfer_end = CYCLE_NEVER;
2144
10e4439d8f13 Fix speed of CDC to PCM RAM DMA
Michael Pavone <pavone@retrodev.com>
parents: 2142
diff changeset
283 context->next_byte_cycle = CYCLE_NEVER;
2231
8e6fb2c06024 Fix CDC transfer regression
Michael Pavone <pavone@retrodev.com>
parents: 2153
diff changeset
284 context->triggered = 0;
2062
07ed42bd7b4c Some progress on CDC and CDD emulation. Now passes first 3 "CDC INIT" tests in mcd-verificator
Michael Pavone <pavone@retrodev.com>
parents: 2058
diff changeset
285 }
07ed42bd7b4c Some progress on CDC and CDD emulation. Now passes first 3 "CDC INIT" tests in mcd-verificator
Michael Pavone <pavone@retrodev.com>
parents: 2058
diff changeset
286 }
2065
02a9846668d1 Implement transfer of data from CDC to elsewhere. Other miscellaneous CDD/CDC improvements
Michael Pavone <pavone@retrodev.com>
parents: 2062
diff changeset
287 } else {
02a9846668d1 Implement transfer of data from CDC to elsewhere. Other miscellaneous CDD/CDC improvements
Michael Pavone <pavone@retrodev.com>
parents: 2062
diff changeset
288 // pause transfer
2144
10e4439d8f13 Fix speed of CDC to PCM RAM DMA
Michael Pavone <pavone@retrodev.com>
parents: 2142
diff changeset
289 context->next_byte_cycle = CYCLE_NEVER;
2065
02a9846668d1 Implement transfer of data from CDC to elsewhere. Other miscellaneous CDD/CDC improvements
Michael Pavone <pavone@retrodev.com>
parents: 2062
diff changeset
290 context->transfer_end = CYCLE_NEVER;
2062
07ed42bd7b4c Some progress on CDC and CDD emulation. Now passes first 3 "CDC INIT" tests in mcd-verificator
Michael Pavone <pavone@retrodev.com>
parents: 2058
diff changeset
291 }
07ed42bd7b4c Some progress on CDC and CDD emulation. Now passes first 3 "CDC INIT" tests in mcd-verificator
Michael Pavone <pavone@retrodev.com>
parents: 2058
diff changeset
292 }
07ed42bd7b4c Some progress on CDC and CDD emulation. Now passes first 3 "CDC INIT" tests in mcd-verificator
Michael Pavone <pavone@retrodev.com>
parents: 2058
diff changeset
293 }
07ed42bd7b4c Some progress on CDC and CDD emulation. Now passes first 3 "CDC INIT" tests in mcd-verificator
Michael Pavone <pavone@retrodev.com>
parents: 2058
diff changeset
294 }
07ed42bd7b4c Some progress on CDC and CDD emulation. Now passes first 3 "CDC INIT" tests in mcd-verificator
Michael Pavone <pavone@retrodev.com>
parents: 2058
diff changeset
295
2066
a61a8a87410c Fix a bunch of CDC/CDD related mcd-verificator failures
Michael Pavone <pavone@retrodev.com>
parents: 2065
diff changeset
296 void lc8951_resume_transfer(lc8951 *context, uint32_t cycle)
2065
02a9846668d1 Implement transfer of data from CDC to elsewhere. Other miscellaneous CDD/CDC improvements
Michael Pavone <pavone@retrodev.com>
parents: 2062
diff changeset
297 {
2231
8e6fb2c06024 Fix CDC transfer regression
Michael Pavone <pavone@retrodev.com>
parents: 2153
diff changeset
298 if (context->triggered && context->transfer_end == CYCLE_NEVER && (context->ifctrl & BIT_DOUTEN)) {
2065
02a9846668d1 Implement transfer of data from CDC to elsewhere. Other miscellaneous CDD/CDC improvements
Michael Pavone <pavone@retrodev.com>
parents: 2062
diff changeset
299 uint16_t transfer_size = context->regs[DBCL] | (context->regs[DBCH] << 8);
2231
8e6fb2c06024 Fix CDC transfer regression
Michael Pavone <pavone@retrodev.com>
parents: 2153
diff changeset
300 //HACK!!! Work around Sub CPU running longer than we would like and dragging other components with it
8e6fb2c06024 Fix CDC transfer regression
Michael Pavone <pavone@retrodev.com>
parents: 2153
diff changeset
301 uint32_t step_diff = (context->cycle - cycle) / context->clock_step;
8e6fb2c06024 Fix CDC transfer regression
Michael Pavone <pavone@retrodev.com>
parents: 2153
diff changeset
302 if (step_diff) {
8e6fb2c06024 Fix CDC transfer regression
Michael Pavone <pavone@retrodev.com>
parents: 2153
diff changeset
303 context->cycle -= step_diff * context->clock_step;
8e6fb2c06024 Fix CDC transfer regression
Michael Pavone <pavone@retrodev.com>
parents: 2153
diff changeset
304 }
8e6fb2c06024 Fix CDC transfer regression
Michael Pavone <pavone@retrodev.com>
parents: 2153
diff changeset
305 context->transfer_end = context->cycle + transfer_size * context->cycles_per_byte;
8e6fb2c06024 Fix CDC transfer regression
Michael Pavone <pavone@retrodev.com>
parents: 2153
diff changeset
306 context->next_byte_cycle = context->cycle;
8e6fb2c06024 Fix CDC transfer regression
Michael Pavone <pavone@retrodev.com>
parents: 2153
diff changeset
307 if (step_diff) {
8e6fb2c06024 Fix CDC transfer regression
Michael Pavone <pavone@retrodev.com>
parents: 2153
diff changeset
308 lc8951_run(context, cycle);
2065
02a9846668d1 Implement transfer of data from CDC to elsewhere. Other miscellaneous CDD/CDC improvements
Michael Pavone <pavone@retrodev.com>
parents: 2062
diff changeset
309 }
02a9846668d1 Implement transfer of data from CDC to elsewhere. Other miscellaneous CDD/CDC improvements
Michael Pavone <pavone@retrodev.com>
parents: 2062
diff changeset
310 }
02a9846668d1 Implement transfer of data from CDC to elsewhere. Other miscellaneous CDD/CDC improvements
Michael Pavone <pavone@retrodev.com>
parents: 2062
diff changeset
311 }
02a9846668d1 Implement transfer of data from CDC to elsewhere. Other miscellaneous CDD/CDC improvements
Michael Pavone <pavone@retrodev.com>
parents: 2062
diff changeset
312
2062
07ed42bd7b4c Some progress on CDC and CDD emulation. Now passes first 3 "CDC INIT" tests in mcd-verificator
Michael Pavone <pavone@retrodev.com>
parents: 2058
diff changeset
313 void lc8951_write_byte(lc8951 *context, uint32_t cycle, int sector_offset, uint8_t byte)
07ed42bd7b4c Some progress on CDC and CDD emulation. Now passes first 3 "CDC INIT" tests in mcd-verificator
Michael Pavone <pavone@retrodev.com>
parents: 2058
diff changeset
314 {
07ed42bd7b4c Some progress on CDC and CDD emulation. Now passes first 3 "CDC INIT" tests in mcd-verificator
Michael Pavone <pavone@retrodev.com>
parents: 2058
diff changeset
315 lc8951_run(context, cycle);
07ed42bd7b4c Some progress on CDC and CDD emulation. Now passes first 3 "CDC INIT" tests in mcd-verificator
Michael Pavone <pavone@retrodev.com>
parents: 2058
diff changeset
316 uint16_t current_write_addr = context->regs[WAL] | (context->regs[WAH] << 8);
2130
28b6453cf7e3 Emulate CDC sync detection and sync insertion rather than relying on external knowledge about sector offset
Michael Pavone <pavone@retrodev.com>
parents: 2122
diff changeset
317
28b6453cf7e3 Emulate CDC sync detection and sync insertion rather than relying on external knowledge about sector offset
Michael Pavone <pavone@retrodev.com>
parents: 2122
diff changeset
318 uint8_t sync_detected = 0, sync_ignored = 0;
28b6453cf7e3 Emulate CDC sync detection and sync insertion rather than relying on external knowledge about sector offset
Michael Pavone <pavone@retrodev.com>
parents: 2122
diff changeset
319 if (byte == 0) {
2342
9f0c67e5c50a Implement CD-ROM data sector scrambling/descrambling
Michael Pavone <pavone@retrodev.com>
parents: 2280
diff changeset
320 if (context->sync_counter == 11) {
2130
28b6453cf7e3 Emulate CDC sync detection and sync insertion rather than relying on external knowledge about sector offset
Michael Pavone <pavone@retrodev.com>
parents: 2122
diff changeset
321 if (context->ctrl1 & BIT_SYDEN) {
28b6453cf7e3 Emulate CDC sync detection and sync insertion rather than relying on external knowledge about sector offset
Michael Pavone <pavone@retrodev.com>
parents: 2122
diff changeset
322 sync_detected = 1;
28b6453cf7e3 Emulate CDC sync detection and sync insertion rather than relying on external knowledge about sector offset
Michael Pavone <pavone@retrodev.com>
parents: 2122
diff changeset
323 } else {
28b6453cf7e3 Emulate CDC sync detection and sync insertion rather than relying on external knowledge about sector offset
Michael Pavone <pavone@retrodev.com>
parents: 2122
diff changeset
324 sync_ignored = 1;
28b6453cf7e3 Emulate CDC sync detection and sync insertion rather than relying on external knowledge about sector offset
Michael Pavone <pavone@retrodev.com>
parents: 2122
diff changeset
325 }
28b6453cf7e3 Emulate CDC sync detection and sync insertion rather than relying on external knowledge about sector offset
Michael Pavone <pavone@retrodev.com>
parents: 2122
diff changeset
326 context->sync_counter = 0;
28b6453cf7e3 Emulate CDC sync detection and sync insertion rather than relying on external knowledge about sector offset
Michael Pavone <pavone@retrodev.com>
parents: 2122
diff changeset
327 } else {
28b6453cf7e3 Emulate CDC sync detection and sync insertion rather than relying on external knowledge about sector offset
Michael Pavone <pavone@retrodev.com>
parents: 2122
diff changeset
328 context->sync_counter = 1;
28b6453cf7e3 Emulate CDC sync detection and sync insertion rather than relying on external knowledge about sector offset
Michael Pavone <pavone@retrodev.com>
parents: 2122
diff changeset
329 }
28b6453cf7e3 Emulate CDC sync detection and sync insertion rather than relying on external knowledge about sector offset
Michael Pavone <pavone@retrodev.com>
parents: 2122
diff changeset
330 } else if (byte == 0xFF && context->sync_counter) {
28b6453cf7e3 Emulate CDC sync detection and sync insertion rather than relying on external knowledge about sector offset
Michael Pavone <pavone@retrodev.com>
parents: 2122
diff changeset
331 context->sync_counter++;
28b6453cf7e3 Emulate CDC sync detection and sync insertion rather than relying on external knowledge about sector offset
Michael Pavone <pavone@retrodev.com>
parents: 2122
diff changeset
332 } else {
28b6453cf7e3 Emulate CDC sync detection and sync insertion rather than relying on external knowledge about sector offset
Michael Pavone <pavone@retrodev.com>
parents: 2122
diff changeset
333 context->sync_counter = 0;
28b6453cf7e3 Emulate CDC sync detection and sync insertion rather than relying on external knowledge about sector offset
Michael Pavone <pavone@retrodev.com>
parents: 2122
diff changeset
334 }
28b6453cf7e3 Emulate CDC sync detection and sync insertion rather than relying on external knowledge about sector offset
Michael Pavone <pavone@retrodev.com>
parents: 2122
diff changeset
335
2342
9f0c67e5c50a Implement CD-ROM data sector scrambling/descrambling
Michael Pavone <pavone@retrodev.com>
parents: 2280
diff changeset
336 //TODO: figure out if chip tries to avoid descrambling sync signal
9f0c67e5c50a Implement CD-ROM data sector scrambling/descrambling
Michael Pavone <pavone@retrodev.com>
parents: 2280
diff changeset
337 if (context->ctrl1 & BIT_DSCREN) {
9f0c67e5c50a Implement CD-ROM data sector scrambling/descrambling
Michael Pavone <pavone@retrodev.com>
parents: 2280
diff changeset
338 byte = cdrom_scramble(&context->scrambler_lsfr, byte);
9f0c67e5c50a Implement CD-ROM data sector scrambling/descrambling
Michael Pavone <pavone@retrodev.com>
parents: 2280
diff changeset
339 }
9f0c67e5c50a Implement CD-ROM data sector scrambling/descrambling
Michael Pavone <pavone@retrodev.com>
parents: 2280
diff changeset
340
2130
28b6453cf7e3 Emulate CDC sync detection and sync insertion rather than relying on external knowledge about sector offset
Michael Pavone <pavone@retrodev.com>
parents: 2122
diff changeset
341 uint8_t sync_inserted = 0;
2142
d9151d0894c7 Fix some CD-ROM emulation issues
Michael Pavone <pavone@retrodev.com>
parents: 2131
diff changeset
342 if (context->ctrl1 & BIT_SYIEN && context->sector_counter == 2351) {
2130
28b6453cf7e3 Emulate CDC sync detection and sync insertion rather than relying on external knowledge about sector offset
Michael Pavone <pavone@retrodev.com>
parents: 2122
diff changeset
343 sync_inserted = 1;
28b6453cf7e3 Emulate CDC sync detection and sync insertion rather than relying on external knowledge about sector offset
Michael Pavone <pavone@retrodev.com>
parents: 2122
diff changeset
344 }
28b6453cf7e3 Emulate CDC sync detection and sync insertion rather than relying on external knowledge about sector offset
Michael Pavone <pavone@retrodev.com>
parents: 2122
diff changeset
345
2142
d9151d0894c7 Fix some CD-ROM emulation issues
Michael Pavone <pavone@retrodev.com>
parents: 2131
diff changeset
346
d9151d0894c7 Fix some CD-ROM emulation issues
Michael Pavone <pavone@retrodev.com>
parents: 2131
diff changeset
347 if (context->sector_counter < 4) {
d9151d0894c7 Fix some CD-ROM emulation issues
Michael Pavone <pavone@retrodev.com>
parents: 2131
diff changeset
348 //TODO: Handle SHDREN = 1
d9151d0894c7 Fix some CD-ROM emulation issues
Michael Pavone <pavone@retrodev.com>
parents: 2131
diff changeset
349 if ((context->ctrl0 & (BIT_DECEN|BIT_WRRQ)) == (BIT_DECEN)) {
d9151d0894c7 Fix some CD-ROM emulation issues
Michael Pavone <pavone@retrodev.com>
parents: 2131
diff changeset
350 //monitor only mode
d9151d0894c7 Fix some CD-ROM emulation issues
Michael Pavone <pavone@retrodev.com>
parents: 2131
diff changeset
351 context->regs[HEAD0 + context->sector_counter] = byte;
d9151d0894c7 Fix some CD-ROM emulation issues
Michael Pavone <pavone@retrodev.com>
parents: 2131
diff changeset
352 }
d9151d0894c7 Fix some CD-ROM emulation issues
Michael Pavone <pavone@retrodev.com>
parents: 2131
diff changeset
353 }
d9151d0894c7 Fix some CD-ROM emulation issues
Michael Pavone <pavone@retrodev.com>
parents: 2131
diff changeset
354
2130
28b6453cf7e3 Emulate CDC sync detection and sync insertion rather than relying on external knowledge about sector offset
Michael Pavone <pavone@retrodev.com>
parents: 2122
diff changeset
355 if (sync_detected || sync_inserted) {
2062
07ed42bd7b4c Some progress on CDC and CDD emulation. Now passes first 3 "CDC INIT" tests in mcd-verificator
Michael Pavone <pavone@retrodev.com>
parents: 2058
diff changeset
356 //we've recevied the sync pattern for the next block
2130
28b6453cf7e3 Emulate CDC sync detection and sync insertion rather than relying on external knowledge about sector offset
Michael Pavone <pavone@retrodev.com>
parents: 2122
diff changeset
357 context->regs[STAT0] &= ~(BIT_ILSYNC | BIT_NOSYNC | BIT_LBLK | BIT_SBLK);
28b6453cf7e3 Emulate CDC sync detection and sync insertion rather than relying on external knowledge about sector offset
Michael Pavone <pavone@retrodev.com>
parents: 2122
diff changeset
358 if (sync_inserted && !(sync_detected || sync_ignored)) {
28b6453cf7e3 Emulate CDC sync detection and sync insertion rather than relying on external knowledge about sector offset
Michael Pavone <pavone@retrodev.com>
parents: 2122
diff changeset
359 context->regs[STAT0] |= BIT_NOSYNC;
28b6453cf7e3 Emulate CDC sync detection and sync insertion rather than relying on external knowledge about sector offset
Michael Pavone <pavone@retrodev.com>
parents: 2122
diff changeset
360 }
2142
d9151d0894c7 Fix some CD-ROM emulation issues
Michael Pavone <pavone@retrodev.com>
parents: 2131
diff changeset
361 if (sync_detected && context->sector_counter != 2351) {
2130
28b6453cf7e3 Emulate CDC sync detection and sync insertion rather than relying on external knowledge about sector offset
Michael Pavone <pavone@retrodev.com>
parents: 2122
diff changeset
362 context->regs[STAT0] |= BIT_ILSYNC;
28b6453cf7e3 Emulate CDC sync detection and sync insertion rather than relying on external knowledge about sector offset
Michael Pavone <pavone@retrodev.com>
parents: 2122
diff changeset
363 }
28b6453cf7e3 Emulate CDC sync detection and sync insertion rather than relying on external knowledge about sector offset
Michael Pavone <pavone@retrodev.com>
parents: 2122
diff changeset
364 context->sector_counter = 0;
2342
9f0c67e5c50a Implement CD-ROM data sector scrambling/descrambling
Michael Pavone <pavone@retrodev.com>
parents: 2280
diff changeset
365 context->scrambler_lsfr = 1;
2062
07ed42bd7b4c Some progress on CDC and CDD emulation. Now passes first 3 "CDC INIT" tests in mcd-verificator
Michael Pavone <pavone@retrodev.com>
parents: 2058
diff changeset
366
07ed42bd7b4c Some progress on CDC and CDD emulation. Now passes first 3 "CDC INIT" tests in mcd-verificator
Michael Pavone <pavone@retrodev.com>
parents: 2058
diff changeset
367 //header/status regs no longer considered "valid"
07ed42bd7b4c Some progress on CDC and CDD emulation. Now passes first 3 "CDC INIT" tests in mcd-verificator
Michael Pavone <pavone@retrodev.com>
parents: 2058
diff changeset
368 context->regs[STAT3] |= BIT_VALST;
2067
f22e04b69272 More CDC/CDD improvements
Michael Pavone <pavone@retrodev.com>
parents: 2066
diff changeset
369 //!DECI is set inactive at the same time as !VALST
f22e04b69272 More CDC/CDD improvements
Michael Pavone <pavone@retrodev.com>
parents: 2066
diff changeset
370 context->regs[IFSTAT] |= BIT_DECI;
2142
d9151d0894c7 Fix some CD-ROM emulation issues
Michael Pavone <pavone@retrodev.com>
parents: 2131
diff changeset
371 //clear error detection status bits
d9151d0894c7 Fix some CD-ROM emulation issues
Michael Pavone <pavone@retrodev.com>
parents: 2131
diff changeset
372 context->regs[STAT0] &= ~(BIT_CRCOK|BIT_UCEBLK);
d9151d0894c7 Fix some CD-ROM emulation issues
Michael Pavone <pavone@retrodev.com>
parents: 2131
diff changeset
373 context->regs[STAT3] &= ~BIT_WLONG;
2067
f22e04b69272 More CDC/CDD improvements
Michael Pavone <pavone@retrodev.com>
parents: 2066
diff changeset
374 if (context->ctrl0 & BIT_DECEN) {
f22e04b69272 More CDC/CDD improvements
Michael Pavone <pavone@retrodev.com>
parents: 2066
diff changeset
375 if (context->ctrl0 & BIT_WRRQ) {
2130
28b6453cf7e3 Emulate CDC sync detection and sync insertion rather than relying on external knowledge about sector offset
Michael Pavone <pavone@retrodev.com>
parents: 2122
diff changeset
376 uint16_t block_start = current_write_addr + 1 - 2352;
2067
f22e04b69272 More CDC/CDD improvements
Michael Pavone <pavone@retrodev.com>
parents: 2066
diff changeset
377 context->regs[PTL] = block_start;
f22e04b69272 More CDC/CDD improvements
Michael Pavone <pavone@retrodev.com>
parents: 2066
diff changeset
378 context->regs[PTH] = block_start >> 8;
f22e04b69272 More CDC/CDD improvements
Michael Pavone <pavone@retrodev.com>
parents: 2066
diff changeset
379 }
2342
9f0c67e5c50a Implement CD-ROM data sector scrambling/descrambling
Michael Pavone <pavone@retrodev.com>
parents: 2280
diff changeset
380 printf("Decoding block starting at %X (WRRQ: %d, sector_offset: %X)\n", context->regs[PTL] | (context->regs[PTH] << 8), !!(context->ctrl0 & BIT_WRRQ), sector_offset);
2131
d90d92ce5cab Improve CDC decode timing accuracy
Michael Pavone <pavone@retrodev.com>
parents: 2130
diff changeset
381 //Based on measurements of a Wondermega M1 (LC8951) with SYDEN, SYIEN and DECEN only
d90d92ce5cab Improve CDC decode timing accuracy
Michael Pavone <pavone@retrodev.com>
parents: 2130
diff changeset
382 context->decode_end = context->cycle + 22030 * context->clock_step;
2062
07ed42bd7b4c Some progress on CDC and CDD emulation. Now passes first 3 "CDC INIT" tests in mcd-verificator
Michael Pavone <pavone@retrodev.com>
parents: 2058
diff changeset
383 }
2130
28b6453cf7e3 Emulate CDC sync detection and sync insertion rather than relying on external knowledge about sector offset
Michael Pavone <pavone@retrodev.com>
parents: 2122
diff changeset
384 } else {
2142
d9151d0894c7 Fix some CD-ROM emulation issues
Michael Pavone <pavone@retrodev.com>
parents: 2131
diff changeset
385 context->sector_counter++;
d9151d0894c7 Fix some CD-ROM emulation issues
Michael Pavone <pavone@retrodev.com>
parents: 2131
diff changeset
386 context->sector_counter &= 0xFFF;
2130
28b6453cf7e3 Emulate CDC sync detection and sync insertion rather than relying on external knowledge about sector offset
Michael Pavone <pavone@retrodev.com>
parents: 2122
diff changeset
387 if (sync_ignored) {
28b6453cf7e3 Emulate CDC sync detection and sync insertion rather than relying on external knowledge about sector offset
Michael Pavone <pavone@retrodev.com>
parents: 2122
diff changeset
388 context->regs[STAT0] |= BIT_SBLK;
28b6453cf7e3 Emulate CDC sync detection and sync insertion rather than relying on external knowledge about sector offset
Michael Pavone <pavone@retrodev.com>
parents: 2122
diff changeset
389 }
28b6453cf7e3 Emulate CDC sync detection and sync insertion rather than relying on external knowledge about sector offset
Michael Pavone <pavone@retrodev.com>
parents: 2122
diff changeset
390 if (context->sector_counter == 2352) {
28b6453cf7e3 Emulate CDC sync detection and sync insertion rather than relying on external knowledge about sector offset
Michael Pavone <pavone@retrodev.com>
parents: 2122
diff changeset
391 context->regs[STAT0] |= BIT_LBLK;
28b6453cf7e3 Emulate CDC sync detection and sync insertion rather than relying on external knowledge about sector offset
Michael Pavone <pavone@retrodev.com>
parents: 2122
diff changeset
392 }
2062
07ed42bd7b4c Some progress on CDC and CDD emulation. Now passes first 3 "CDC INIT" tests in mcd-verificator
Michael Pavone <pavone@retrodev.com>
parents: 2058
diff changeset
393 }
07ed42bd7b4c Some progress on CDC and CDD emulation. Now passes first 3 "CDC INIT" tests in mcd-verificator
Michael Pavone <pavone@retrodev.com>
parents: 2058
diff changeset
394 if ((context->ctrl0 & (BIT_DECEN|BIT_WRRQ)) == (BIT_DECEN|BIT_WRRQ)) {
07ed42bd7b4c Some progress on CDC and CDD emulation. Now passes first 3 "CDC INIT" tests in mcd-verificator
Michael Pavone <pavone@retrodev.com>
parents: 2058
diff changeset
395 context->buffer[current_write_addr & (sizeof(context->buffer)-1)] = byte;
07ed42bd7b4c Some progress on CDC and CDD emulation. Now passes first 3 "CDC INIT" tests in mcd-verificator
Michael Pavone <pavone@retrodev.com>
parents: 2058
diff changeset
396 context->regs[WAL]++;
07ed42bd7b4c Some progress on CDC and CDD emulation. Now passes first 3 "CDC INIT" tests in mcd-verificator
Michael Pavone <pavone@retrodev.com>
parents: 2058
diff changeset
397 if (!context->regs[WAL]) {
07ed42bd7b4c Some progress on CDC and CDD emulation. Now passes first 3 "CDC INIT" tests in mcd-verificator
Michael Pavone <pavone@retrodev.com>
parents: 2058
diff changeset
398 context->regs[WAH]++;
07ed42bd7b4c Some progress on CDC and CDD emulation. Now passes first 3 "CDC INIT" tests in mcd-verificator
Michael Pavone <pavone@retrodev.com>
parents: 2058
diff changeset
399 }
07ed42bd7b4c Some progress on CDC and CDD emulation. Now passes first 3 "CDC INIT" tests in mcd-verificator
Michael Pavone <pavone@retrodev.com>
parents: 2058
diff changeset
400 }
07ed42bd7b4c Some progress on CDC and CDD emulation. Now passes first 3 "CDC INIT" tests in mcd-verificator
Michael Pavone <pavone@retrodev.com>
parents: 2058
diff changeset
401 }
07ed42bd7b4c Some progress on CDC and CDD emulation. Now passes first 3 "CDC INIT" tests in mcd-verificator
Michael Pavone <pavone@retrodev.com>
parents: 2058
diff changeset
402
07ed42bd7b4c Some progress on CDC and CDD emulation. Now passes first 3 "CDC INIT" tests in mcd-verificator
Michael Pavone <pavone@retrodev.com>
parents: 2058
diff changeset
403 uint32_t lc8951_next_interrupt(lc8951 *context)
07ed42bd7b4c Some progress on CDC and CDD emulation. Now passes first 3 "CDC INIT" tests in mcd-verificator
Michael Pavone <pavone@retrodev.com>
parents: 2058
diff changeset
404 {
2065
02a9846668d1 Implement transfer of data from CDC to elsewhere. Other miscellaneous CDD/CDC improvements
Michael Pavone <pavone@retrodev.com>
parents: 2062
diff changeset
405 if ((~context->regs[IFSTAT]) & context->ifctrl & (BIT_CMDI|BIT_DTEI|BIT_DECI)) {
2062
07ed42bd7b4c Some progress on CDC and CDD emulation. Now passes first 3 "CDC INIT" tests in mcd-verificator
Michael Pavone <pavone@retrodev.com>
parents: 2058
diff changeset
406 //interrupt already pending
07ed42bd7b4c Some progress on CDC and CDD emulation. Now passes first 3 "CDC INIT" tests in mcd-verificator
Michael Pavone <pavone@retrodev.com>
parents: 2058
diff changeset
407 return context->cycle;
07ed42bd7b4c Some progress on CDC and CDD emulation. Now passes first 3 "CDC INIT" tests in mcd-verificator
Michael Pavone <pavone@retrodev.com>
parents: 2058
diff changeset
408 }
07ed42bd7b4c Some progress on CDC and CDD emulation. Now passes first 3 "CDC INIT" tests in mcd-verificator
Michael Pavone <pavone@retrodev.com>
parents: 2058
diff changeset
409 uint32_t deci_cycle = CYCLE_NEVER;
2131
d90d92ce5cab Improve CDC decode timing accuracy
Michael Pavone <pavone@retrodev.com>
parents: 2130
diff changeset
410 if (context->ifctrl & BIT_DECIEN) {
2062
07ed42bd7b4c Some progress on CDC and CDD emulation. Now passes first 3 "CDC INIT" tests in mcd-verificator
Michael Pavone <pavone@retrodev.com>
parents: 2058
diff changeset
411 deci_cycle = context->decode_end;
07ed42bd7b4c Some progress on CDC and CDD emulation. Now passes first 3 "CDC INIT" tests in mcd-verificator
Michael Pavone <pavone@retrodev.com>
parents: 2058
diff changeset
412 }
07ed42bd7b4c Some progress on CDC and CDD emulation. Now passes first 3 "CDC INIT" tests in mcd-verificator
Michael Pavone <pavone@retrodev.com>
parents: 2058
diff changeset
413 uint32_t dtei_cycle = CYCLE_NEVER;
2131
d90d92ce5cab Improve CDC decode timing accuracy
Michael Pavone <pavone@retrodev.com>
parents: 2130
diff changeset
414 if (context->ifctrl & BIT_DTEIEN) {
2062
07ed42bd7b4c Some progress on CDC and CDD emulation. Now passes first 3 "CDC INIT" tests in mcd-verificator
Michael Pavone <pavone@retrodev.com>
parents: 2058
diff changeset
415 dtei_cycle = context->transfer_end;
07ed42bd7b4c Some progress on CDC and CDD emulation. Now passes first 3 "CDC INIT" tests in mcd-verificator
Michael Pavone <pavone@retrodev.com>
parents: 2058
diff changeset
416 }
07ed42bd7b4c Some progress on CDC and CDD emulation. Now passes first 3 "CDC INIT" tests in mcd-verificator
Michael Pavone <pavone@retrodev.com>
parents: 2058
diff changeset
417 return deci_cycle < dtei_cycle ? deci_cycle : dtei_cycle;
07ed42bd7b4c Some progress on CDC and CDD emulation. Now passes first 3 "CDC INIT" tests in mcd-verificator
Michael Pavone <pavone@retrodev.com>
parents: 2058
diff changeset
418 }
2066
a61a8a87410c Fix a bunch of CDC/CDD related mcd-verificator failures
Michael Pavone <pavone@retrodev.com>
parents: 2065
diff changeset
419
a61a8a87410c Fix a bunch of CDC/CDD related mcd-verificator failures
Michael Pavone <pavone@retrodev.com>
parents: 2065
diff changeset
420 void lc8951_adjust_cycles(lc8951 *context, uint32_t deduction)
a61a8a87410c Fix a bunch of CDC/CDD related mcd-verificator failures
Michael Pavone <pavone@retrodev.com>
parents: 2065
diff changeset
421 {
2073
c69e42444f96 Fix some cycle adjustment stuff and an off-by one on hte TOCT response
Michael Pavone <pavone@retrodev.com>
parents: 2067
diff changeset
422 printf("CDC deduction of %u cycles @ %u, ", deduction, context->cycle);
c69e42444f96 Fix some cycle adjustment stuff and an off-by one on hte TOCT response
Michael Pavone <pavone@retrodev.com>
parents: 2067
diff changeset
423 context->cycle -= deduction;
2066
a61a8a87410c Fix a bunch of CDC/CDD related mcd-verificator failures
Michael Pavone <pavone@retrodev.com>
parents: 2065
diff changeset
424 if (context->decode_end != CYCLE_NEVER) {
a61a8a87410c Fix a bunch of CDC/CDD related mcd-verificator failures
Michael Pavone <pavone@retrodev.com>
parents: 2065
diff changeset
425 context->decode_end -= deduction;
a61a8a87410c Fix a bunch of CDC/CDD related mcd-verificator failures
Michael Pavone <pavone@retrodev.com>
parents: 2065
diff changeset
426 }
a61a8a87410c Fix a bunch of CDC/CDD related mcd-verificator failures
Michael Pavone <pavone@retrodev.com>
parents: 2065
diff changeset
427 if (context->transfer_end != CYCLE_NEVER) {
a61a8a87410c Fix a bunch of CDC/CDD related mcd-verificator failures
Michael Pavone <pavone@retrodev.com>
parents: 2065
diff changeset
428 context->transfer_end -= deduction;
a61a8a87410c Fix a bunch of CDC/CDD related mcd-verificator failures
Michael Pavone <pavone@retrodev.com>
parents: 2065
diff changeset
429 }
2147
4cd60eecb0b1 Fix LC8951 cycle adjustment for data transfer next byte tracking
Michael Pavone <pavone@retrodev.com>
parents: 2144
diff changeset
430 if (context->next_byte_cycle != CYCLE_NEVER) {
4cd60eecb0b1 Fix LC8951 cycle adjustment for data transfer next byte tracking
Michael Pavone <pavone@retrodev.com>
parents: 2144
diff changeset
431 context->next_byte_cycle -= deduction;
4cd60eecb0b1 Fix LC8951 cycle adjustment for data transfer next byte tracking
Michael Pavone <pavone@retrodev.com>
parents: 2144
diff changeset
432 }
2073
c69e42444f96 Fix some cycle adjustment stuff and an off-by one on hte TOCT response
Michael Pavone <pavone@retrodev.com>
parents: 2067
diff changeset
433 printf("cycle is now %u, decode_end %u, transfer_end %u\n", context->cycle, context->decode_end, context->transfer_end);
2066
a61a8a87410c Fix a bunch of CDC/CDD related mcd-verificator failures
Michael Pavone <pavone@retrodev.com>
parents: 2065
diff changeset
434 }
2280
9ead0fe69d9b Implement savestate support for Sega CD
Michael Pavone <pavone@retrodev.com>
parents: 2265
diff changeset
435
9ead0fe69d9b Implement savestate support for Sega CD
Michael Pavone <pavone@retrodev.com>
parents: 2265
diff changeset
436 void lc8951_serialize(lc8951 *context, serialize_buffer *buf)
9ead0fe69d9b Implement savestate support for Sega CD
Michael Pavone <pavone@retrodev.com>
parents: 2265
diff changeset
437 {
9ead0fe69d9b Implement savestate support for Sega CD
Michael Pavone <pavone@retrodev.com>
parents: 2265
diff changeset
438 save_int32(buf, context->cycle);
9ead0fe69d9b Implement savestate support for Sega CD
Michael Pavone <pavone@retrodev.com>
parents: 2265
diff changeset
439 save_int32(buf, context->decode_end);
9ead0fe69d9b Implement savestate support for Sega CD
Michael Pavone <pavone@retrodev.com>
parents: 2265
diff changeset
440 save_int32(buf, context->transfer_end);
9ead0fe69d9b Implement savestate support for Sega CD
Michael Pavone <pavone@retrodev.com>
parents: 2265
diff changeset
441 save_int32(buf, context->next_byte_cycle);
9ead0fe69d9b Implement savestate support for Sega CD
Michael Pavone <pavone@retrodev.com>
parents: 2265
diff changeset
442 save_int16(buf, context->sector_counter);
9ead0fe69d9b Implement savestate support for Sega CD
Michael Pavone <pavone@retrodev.com>
parents: 2265
diff changeset
443 save_buffer8(buf, context->buffer, sizeof(context->buffer));
9ead0fe69d9b Implement savestate support for Sega CD
Michael Pavone <pavone@retrodev.com>
parents: 2265
diff changeset
444 save_buffer8(buf, context->regs, sizeof(context->regs));
9ead0fe69d9b Implement savestate support for Sega CD
Michael Pavone <pavone@retrodev.com>
parents: 2265
diff changeset
445 save_buffer8(buf, context->comin, sizeof(context->comin));
9ead0fe69d9b Implement savestate support for Sega CD
Michael Pavone <pavone@retrodev.com>
parents: 2265
diff changeset
446 save_int16(buf, context->dac);
9ead0fe69d9b Implement savestate support for Sega CD
Michael Pavone <pavone@retrodev.com>
parents: 2265
diff changeset
447 save_int8(buf, context->comin_write);
9ead0fe69d9b Implement savestate support for Sega CD
Michael Pavone <pavone@retrodev.com>
parents: 2265
diff changeset
448 save_int8(buf, context->comin_count);
9ead0fe69d9b Implement savestate support for Sega CD
Michael Pavone <pavone@retrodev.com>
parents: 2265
diff changeset
449 save_int8(buf, context->ifctrl);
9ead0fe69d9b Implement savestate support for Sega CD
Michael Pavone <pavone@retrodev.com>
parents: 2265
diff changeset
450 save_int8(buf, context->ctrl0);
9ead0fe69d9b Implement savestate support for Sega CD
Michael Pavone <pavone@retrodev.com>
parents: 2265
diff changeset
451 save_int8(buf, context->ctrl1);
9ead0fe69d9b Implement savestate support for Sega CD
Michael Pavone <pavone@retrodev.com>
parents: 2265
diff changeset
452 save_int8(buf, context->ar);
9ead0fe69d9b Implement savestate support for Sega CD
Michael Pavone <pavone@retrodev.com>
parents: 2265
diff changeset
453 save_int8(buf, context->ar_mask);
9ead0fe69d9b Implement savestate support for Sega CD
Michael Pavone <pavone@retrodev.com>
parents: 2265
diff changeset
454 save_int8(buf, context->triggered);
9ead0fe69d9b Implement savestate support for Sega CD
Michael Pavone <pavone@retrodev.com>
parents: 2265
diff changeset
455 save_int8(buf, context->sync_counter);
9ead0fe69d9b Implement savestate support for Sega CD
Michael Pavone <pavone@retrodev.com>
parents: 2265
diff changeset
456 }
9ead0fe69d9b Implement savestate support for Sega CD
Michael Pavone <pavone@retrodev.com>
parents: 2265
diff changeset
457
9ead0fe69d9b Implement savestate support for Sega CD
Michael Pavone <pavone@retrodev.com>
parents: 2265
diff changeset
458 void lc8951_deserialize(deserialize_buffer *buf, void *vcontext)
9ead0fe69d9b Implement savestate support for Sega CD
Michael Pavone <pavone@retrodev.com>
parents: 2265
diff changeset
459 {
9ead0fe69d9b Implement savestate support for Sega CD
Michael Pavone <pavone@retrodev.com>
parents: 2265
diff changeset
460 lc8951 *context = vcontext;
9ead0fe69d9b Implement savestate support for Sega CD
Michael Pavone <pavone@retrodev.com>
parents: 2265
diff changeset
461 context->cycle = load_int32(buf);
9ead0fe69d9b Implement savestate support for Sega CD
Michael Pavone <pavone@retrodev.com>
parents: 2265
diff changeset
462 context->decode_end = load_int32(buf);
9ead0fe69d9b Implement savestate support for Sega CD
Michael Pavone <pavone@retrodev.com>
parents: 2265
diff changeset
463 context->transfer_end = load_int32(buf);
9ead0fe69d9b Implement savestate support for Sega CD
Michael Pavone <pavone@retrodev.com>
parents: 2265
diff changeset
464 context->next_byte_cycle = load_int32(buf);
9ead0fe69d9b Implement savestate support for Sega CD
Michael Pavone <pavone@retrodev.com>
parents: 2265
diff changeset
465 context->sector_counter = load_int16(buf);
9ead0fe69d9b Implement savestate support for Sega CD
Michael Pavone <pavone@retrodev.com>
parents: 2265
diff changeset
466 load_buffer8(buf, context->buffer, sizeof(context->buffer));
9ead0fe69d9b Implement savestate support for Sega CD
Michael Pavone <pavone@retrodev.com>
parents: 2265
diff changeset
467 load_buffer8(buf, context->regs, sizeof(context->regs));
9ead0fe69d9b Implement savestate support for Sega CD
Michael Pavone <pavone@retrodev.com>
parents: 2265
diff changeset
468 load_buffer8(buf, context->comin, sizeof(context->comin));
9ead0fe69d9b Implement savestate support for Sega CD
Michael Pavone <pavone@retrodev.com>
parents: 2265
diff changeset
469 context->dac = load_int16(buf);
9ead0fe69d9b Implement savestate support for Sega CD
Michael Pavone <pavone@retrodev.com>
parents: 2265
diff changeset
470 context->comin_write = load_int8(buf);
9ead0fe69d9b Implement savestate support for Sega CD
Michael Pavone <pavone@retrodev.com>
parents: 2265
diff changeset
471 context->comin_count = load_int8(buf);
9ead0fe69d9b Implement savestate support for Sega CD
Michael Pavone <pavone@retrodev.com>
parents: 2265
diff changeset
472 context->ifctrl = load_int8(buf);
9ead0fe69d9b Implement savestate support for Sega CD
Michael Pavone <pavone@retrodev.com>
parents: 2265
diff changeset
473 context->ctrl0 = load_int8(buf);
9ead0fe69d9b Implement savestate support for Sega CD
Michael Pavone <pavone@retrodev.com>
parents: 2265
diff changeset
474 context->ctrl1 = load_int8(buf);
9ead0fe69d9b Implement savestate support for Sega CD
Michael Pavone <pavone@retrodev.com>
parents: 2265
diff changeset
475 context->ar = load_int8(buf);
9ead0fe69d9b Implement savestate support for Sega CD
Michael Pavone <pavone@retrodev.com>
parents: 2265
diff changeset
476 context->ar_mask = load_int8(buf);
9ead0fe69d9b Implement savestate support for Sega CD
Michael Pavone <pavone@retrodev.com>
parents: 2265
diff changeset
477 context->triggered = load_int8(buf);
9ead0fe69d9b Implement savestate support for Sega CD
Michael Pavone <pavone@retrodev.com>
parents: 2265
diff changeset
478 context->sync_counter = load_int8(buf);
9ead0fe69d9b Implement savestate support for Sega CD
Michael Pavone <pavone@retrodev.com>
parents: 2265
diff changeset
479 }