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annotate cdd_mcu.h @ 2062:07ed42bd7b4c segacd

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Some progress on CDC and CDD emulation. Now passes first 3 "CDC INIT" tests in mcd-verificator
author Michael Pavone <pavone@retrodev.com>
date Fri, 28 Jan 2022 00:50:17 -0800
parents 7c1760b5b3e5
children 91e4d2fe5cd9
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1 #ifndef CDD_MCU_H_
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2 #define CDD_MCU_H_
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3 #include "system.h"
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4 #include "lc8951.h"
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5
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6 typedef enum {
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7 SF_ABSOLUTE,
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8 SF_RELATIVE,
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9 SF_TRACK,
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10 SF_TOCO,
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11 SF_TOCT,
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12 SF_TOCN,
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13 SF_E,
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14 SF_NOTREADY = 0xF
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15 } status_format;
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16
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17 typedef enum {
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18 CMD_NOP,
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19 CMD_STOP,
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20 CMD_REPORT_REQUEST,
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21 CMD_READ,
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22 CMD_SEEK,
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23 CMD_INVALID,
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24 CMD_PAUSE,
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25 CMD_PLAY,
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26 CMD_FFWD,
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27 CMD_RWD,
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28 CMD_TRACK_SKIP,
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29 CMD_TRACK_CUE,
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30 CMD_DOOR_CLOSE,
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31 CMD_DOOR_OPEN
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32 } host_cmd;
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33
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34 typedef enum {
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35 DS_STOP,
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36 DS_PLAY,
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37 DS_SEEK,
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38 DS_SCAN,
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39 DS_PAUSE,
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40 DS_DOOR_OPEN,
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41 DS_SUM_ERROR,
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42 DS_CMD_ERROR,
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43 DS_FUNC_ERROR,
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44 DS_TOC_READ,
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45 DS_TRACKING,
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46 DS_NO_DISC,
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47 DS_DISC_LEADOUT,
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48 DS_DISC_LEADIN,
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49 DS_TRAY_MOVING,
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50 } drive_status;
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51
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52
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53 typedef struct {
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54 uint8_t status;
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55 uint8_t format;
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56 union {
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57 struct {
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58 uint8_t min_high;
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59 uint8_t min_low;
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60 uint8_t sec_high;
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61 uint8_t sec_low;
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62 uint8_t frame_high;
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63 uint8_t frame_low;
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64 uint8_t flags;
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65 } time;
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66 struct {
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67 uint8_t track_high;
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68 uint8_t track_low;
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69 uint8_t padding0;
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70 uint8_t padding1;
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71 uint8_t control;
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72 uint8_t padding2;
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73 uint8_t flags;
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74 } track;
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75 struct {
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76 uint8_t first_track_high;
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77 uint8_t first_track_low;
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78 uint8_t last_track_high;
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79 uint8_t last_track_low;
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80 uint8_t version;
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81 uint8_t padding;
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82 uint8_t flags;
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83 } toct;
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84 struct {
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85 uint8_t min_high;
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86 uint8_t min_low;
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87 uint8_t sec_high;
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88 uint8_t sec_low;
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89 uint8_t frame_high;
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90 uint8_t frame_low;
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91 uint8_t track_low;
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92 } tocn;
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93 struct {
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94 } error;
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95 } b;
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96 uint8_t checksum;
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97 } cdd_status;
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98
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99 typedef struct {
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100 uint8_t cmd_type;
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101 uint8_t must_be_zero;
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102 union {
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103 struct {
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104 uint8_t min_high;
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105 uint8_t min_low;
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106 uint8_t sec_high;
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107 uint8_t sec_low;
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108 uint8_t frame_high;
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109 uint8_t frame_low;
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110 } time;
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111 struct {
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112 uint8_t padding;
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113 uint8_t status_type;
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114 uint8_t track_high;
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115 uint8_t track_low;
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116 } format;
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117 struct {
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118 uint8_t padding;
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119 uint8_t direction;
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120 uint8_t tracks_highest;
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121 uint8_t tracks_midhigh;
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122 uint8_t tracks_midlow;
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123 uint8_t tracks_lowest;
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124 } skip;
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125 struct {
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126 uint8_t track_high;
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127 uint8_t track_low;
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128 } track;
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129 } b;
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130 uint8_t padding;
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131 uint8_t checksum;
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132 } cdd_cmd;
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133
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134 typedef struct {
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135 system_media *media;
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136 uint32_t cycle; //this is in CD block CLKS
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137 uint32_t next_int_cycle; //this is in SCD MCLKS
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138 uint32_t last_subcode_cycle;
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139 uint32_t last_nibble_cycle;
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140 uint32_t last_byte_cycle;
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141 int current_status_nibble;
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142 int current_cmd_nibble;
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143 int current_sector_byte;
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144 uint32_t head_pba;
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145 uint32_t seek_pba;
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146 cdd_status status_buffer;
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147 cdd_cmd cmd_buffer;
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148 status_format requested_format;
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149 drive_status status;
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150 drive_status error_status;
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151 uint8_t requested_track;
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152 uint8_t cmd_recv_wait;
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153 uint8_t cmd_recv_pending;
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154 uint8_t int_pending;
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155 uint8_t toc_valid;
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156 uint8_t seeking;
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157 uint8_t in_fake_pregap;
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158 } cdd_mcu;
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159
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160 void cdd_mcu_init(cdd_mcu *context, system_media *media);
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161 void cdd_mcu_run(cdd_mcu *context, uint32_t cycle, uint16_t *gate_array, lc8951* cdc);
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162 void cdd_hock_enabled(cdd_mcu *context);
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163 void cdd_hock_disabled(cdd_mcu *context);
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164 void cdd_mcu_start_cmd_recv(cdd_mcu *context, uint16_t *gate_array);
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165 void cdd_mcu_adjust_cycle(cdd_mcu *context, uint32_t deduction);
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166
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167 #endif //CD_MCU_H_