1 | /*
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2 | * Copyright (C) 2017 The Contributors
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3 | *
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4 | * This program is free software: you can redistribute it and/or modify
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5 | * it under the terms of the GNU General Public License as published by
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6 | * the Free Software Foundation, either version 3 of the License, or (at
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7 | * your option) any later version.
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8 | *
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9 | * This program is distributed in the hope that it will be useful, but
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10 | * WITHOUT ANY WARRANTY; without even the implied warranty of
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11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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12 | * General Public License for more details.
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13 | *
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14 | * A copy of the GNU General Public License can be found in the file
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15 | * "gpl.txt" in the top directory of this repository.
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16 | */
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17 |
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18 | #include <all.h>
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19 |
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20 | #define ver(...) _ver(ser_verbose, 0, __VA_ARGS__)
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21 | #define ver2(...) _ver(ser_verbose, 1, __VA_ARGS__)
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22 | #define ver3(...) _ver(ser_verbose, 2, __VA_ARGS__)
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23 |
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24 | int32_t ser_verbose = 0;
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25 |
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26 | #define WIN_W (1520 * 2 / 3)
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27 | #define WIN_H (950 * 2 / 3)
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28 |
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29 | #define BEL_CYC 10000
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30 |
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31 | #define CON_W 80
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32 | #define CON_H 25
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33 |
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34 | #define CON_BGR 0x00000000
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35 | #define CON_BEL 0x00808080
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36 | #define CON_CUR 0x00e87000
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37 | #define CON_FGR ((SDL_Color){ .r = 255, .b = 255, .g = 255, .a = 255 })
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38 |
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39 | #define REG_IER_ISR 0
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40 | #define REG_CFR_SR 1
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41 | #define REG_CDR_TBR 2
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42 | #define REG_TDR_RDR 3
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43 |
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44 | typedef struct {
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45 | bool irq_r;
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46 | bool irq_t;
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47 | bool rdr_ok;
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48 | uint8_t rdr;
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49 | } state_t;
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50 |
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51 | static state_t state[] = {
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52 | { .irq_r = false, .irq_t = false, .rdr_ok = false, .rdr = 0x00 },
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53 | { .irq_r = false, .irq_t = false, .rdr_ok = false, .rdr = 0x00 }
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54 | };
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55 |
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56 | static uint8_t mem[CON_H][CON_W + 1];
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57 |
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58 | static SDL_Window *win;
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59 | static SDL_Renderer *ren;
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60 | static SDL_atomic_t frame;
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61 |
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62 | static TTF_Font *fon;
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63 | static int32_t fon_w, fon_h;
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64 |
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65 | static int32_t sur_w, sur_h;
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66 | static SDL_Surface *sur;
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67 |
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68 | static int32_t cur_x = 0, cur_y = 0;
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69 | static int32_t bel = 0;
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70 |
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71 | static void scroll(void)
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72 | {
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73 | memmove(mem, mem + 1, (CON_H - 1) * (CON_W + 1));
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74 | memset(mem + (CON_H - 1), ' ', CON_W);
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75 | }
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76 |
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77 | static void forw(void)
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78 | {
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79 | if (cur_x < CON_W - 1) {
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80 | ++cur_x;
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81 | return;
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82 | }
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83 |
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84 | if (cur_y == CON_H - 1) {
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85 | cur_x = 0;
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86 | scroll();
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87 | return;
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88 | }
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89 |
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90 | cur_x = 0;
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91 | ++cur_y;
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92 | }
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93 |
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94 | static void back(void)
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95 | {
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96 | if (cur_x > 0) {
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97 | --cur_x;
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98 | return;
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99 | }
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100 |
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101 | if (cur_y == 0) {
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102 | return;
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103 | }
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104 |
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105 | cur_x = CON_W - 1;
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106 | --cur_y;
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107 | }
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108 |
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109 | static void down(void)
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110 | {
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111 | if (cur_y < CON_H - 1) {
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112 | ++cur_y;
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113 | return;
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114 | }
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115 |
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116 | scroll();
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117 | }
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118 |
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119 | static void echo(uint8_t c)
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120 | {
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121 | if (c < 32) {
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122 | switch (c) {
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123 | case '\r':
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124 | cur_x = 0;
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125 | break;
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126 |
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127 | case '\n':
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128 | down();
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129 | break;
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130 |
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131 | case '\b':
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132 | back();
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133 | break;
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134 |
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135 | case '\a':
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136 | bel = BEL_CYC;
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137 | break;
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138 |
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139 | default:
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140 | echo('^');
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141 | echo((uint8_t)(c + '@'));
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142 | return;
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143 | }
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144 | }
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145 | else {
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146 | mem[cur_y][cur_x] = c;
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147 | forw();
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148 | }
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149 |
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150 | SDL_AtomicAdd(&frame, 1);
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151 | }
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152 |
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153 | static void out(int32_t un, uint8_t c)
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154 | {
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155 | if (SDL_LockMutex(cpu_mutex) < 0) {
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156 | fail("SDL_LockMutex() failed: %s", SDL_GetError());
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157 | }
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158 |
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159 | state[un].rdr = c;
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160 | state[un].rdr_ok = true;
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161 | state[un].irq_r = true;
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162 |
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163 | if (SDL_UnlockMutex(cpu_mutex) < 0) {
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164 | fail("SDL_UnlockMutex() failed: %s", SDL_GetError());
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165 | }
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166 | }
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167 |
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168 | void ser_sdl(void)
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169 | {
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170 | ver3("ser_sdl()");
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171 |
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172 | static int32_t last = 0;
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173 | int32_t now = SDL_AtomicGet(&frame);
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174 |
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175 | if (last == now) {
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176 | ver3("no update");
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177 | return;
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178 | }
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179 |
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180 | last = now;
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181 |
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182 | if (SDL_FillRect(sur, NULL, bel == 0 ? CON_BGR : CON_BEL) < 0) {
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183 | fail("SDL_FillRect() failed: %s", SDL_GetError());
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184 | }
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185 |
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186 | if (SDL_FillRect(sur, &(SDL_Rect){
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187 | .x = cur_x * fon_w,
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188 | .y = cur_y * fon_h,
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189 | .w = fon_w,
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190 | .h = fon_h
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191 | }, CON_CUR) < 0) {
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192 | fail("SDL_FillRect() failed: %s", SDL_GetError());
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193 | }
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194 |
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195 | for (int32_t y = 0; y < CON_H; ++y) {
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196 | char line[CON_W + 1];
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197 |
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198 | if (SDL_LockMutex(cpu_mutex) < 0) {
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199 | fail("SDL_LockMutex() failed: %s", SDL_GetError());
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200 | }
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201 |
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202 | memcpy(line, mem[y], CON_W + 1);
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203 |
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204 | if (SDL_UnlockMutex(cpu_mutex) < 0) {
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205 | fail("SDL_UnlockMutex() failed: %s", SDL_GetError());
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206 | }
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207 |
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208 | SDL_Surface *lin = TTF_RenderText_Blended(fon, line, CON_FGR);
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209 |
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210 | if (lin == NULL) {
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211 | fail("TTF_RenderText_Blended() failed: %s", TTF_GetError());
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212 | }
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213 |
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214 | if (SDL_BlitSurface(lin, NULL, sur, &(SDL_Rect){
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215 | .x = 0,
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216 | .y = y * fon_h,
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217 | .w = CON_W * fon_w,
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218 | .h = fon_h
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219 | })) {
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220 | fail("SDL_BlitSurface() failed: %s", SDL_GetError());
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221 | }
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222 |
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223 | SDL_FreeSurface(lin);
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224 | }
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225 |
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226 | SDL_Texture *tex = SDL_CreateTextureFromSurface(ren, sur);
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227 |
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228 | if (tex == NULL) {
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229 | fail("SDL_CreateTextureFromSurface() failed: %s", SDL_GetError());
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230 | }
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231 |
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232 | if (SDL_RenderCopy(ren, tex, NULL, NULL) < 0) {
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233 | fail("SDL_RenderCopy() failed: %s", SDL_GetError());
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234 | }
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235 |
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236 | SDL_DestroyTexture(tex);
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237 | SDL_RenderPresent(ren);
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238 | }
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239 |
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240 | void ser_key(SDL_KeyboardEvent *ev)
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241 | {
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242 | switch (ev->keysym.sym) {
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243 | case SDLK_BACKSPACE:
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244 | out(1, '\b');
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245 | break;
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246 |
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247 | case SDLK_RETURN:
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248 | out(1, '\r');
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249 | break;
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250 |
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251 | default:
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252 | if ((ev->keysym.mod & KMOD_CTRL) != 0 &&
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253 | ev->keysym.sym >= SDLK_a && ev->keysym.sym <= SDLK_z) {
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254 | out(1, (uint8_t)(ev->keysym.sym - SDLK_a + 1));
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255 | }
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256 |
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257 | break;
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258 | }
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259 | }
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260 |
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261 | void ser_text(SDL_TextInputEvent *ev)
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262 | {
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263 | for (int32_t i = 0; ev->text[i] != 0; ++i) {
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264 | out(1, (uint8_t)ev->text[i]);
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265 | }
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266 | }
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267 |
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268 | void ser_init(void)
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269 | {
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270 | ver("ser init");
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271 |
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272 | win = SDL_CreateWindow("Serial Console", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED,
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273 | WIN_W, WIN_H, 0);
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274 |
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275 | if (win == NULL) {
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276 | fail("SDL_CreateWindow() failed: %s", SDL_GetError());
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277 | }
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278 |
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279 | ren = SDL_CreateRenderer(win, -1, 0);
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280 |
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281 | if (ren == NULL) {
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282 | fail("SDL_CreateRenderer() failed: %s", SDL_GetError());
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283 | }
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284 |
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285 | SDL_AtomicSet(&frame, 1);
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286 |
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287 | SDL_RWops *ops = SDL_RWFromFile(font, "rb");
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288 |
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289 | if (ops == NULL) {
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290 | fail("error while opening font file %s: %s", font, SDL_GetError());
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291 | }
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292 |
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293 | fon = TTF_OpenFontRW(ops, 1, 32);
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294 |
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295 | if (fon == NULL) {
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296 | fail("error while loading font file %s: %s", font, TTF_GetError());
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297 | }
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298 |
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299 | fon_h = TTF_FontLineSkip(fon);
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300 |
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301 | if (TTF_GlyphMetrics(fon, 'X', NULL, NULL, NULL, NULL, &fon_w) < 0) {
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302 | fail("error while measuring font width: %s", TTF_GetError());
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303 | }
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304 |
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305 | sur_w = CON_W * fon_w;
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306 | sur_h = CON_H * fon_h;
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307 |
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308 | sur = SDL_CreateRGBSurface(0, sur_w, sur_h, 32, 0, 0, 0, 0);
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309 |
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310 | if (sur == NULL) {
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311 | fail("SDL_CreateRGBSurface() failed: %s", SDL_GetError());
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312 | }
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313 |
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314 | for (int32_t y = 0; y < CON_H; ++y) {
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315 | for (int32_t x = 0; x < CON_W; ++x) {
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316 | mem[y][x] = ' ';
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317 | }
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318 |
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319 | mem[y][CON_W] = 0;
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320 | }
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321 | }
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322 |
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323 | void ser_quit(void)
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324 | {
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325 | ver("ser quit");
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326 |
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327 | SDL_FreeSurface(sur);
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328 | TTF_CloseFont(fon);
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329 |
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330 | SDL_DestroyRenderer(ren);
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331 | SDL_DestroyWindow(win);
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332 | }
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333 |
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334 | bool ser_exec(void)
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335 | {
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336 | ver3("ser exec");
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337 |
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338 | if (bel > 0) {
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339 | --bel;
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340 |
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341 | if (bel == BEL_CYC - 1 || bel == 0) {
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342 | SDL_AtomicAdd(&frame, 1);
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343 | }
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344 | }
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345 |
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346 | return state[0].irq_r || state[0].irq_t || state[1].irq_r || state[1].irq_t;
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347 | }
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348 |
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349 | uint32_t ser_read(uint32_t off, int32_t sz)
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350 | {
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351 | ver2("ser rd %u:%d", off, sz * 8);
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352 |
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353 | if (sz != 1 || off > 7) {
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354 | fail("invalid ser rd %u:%d", off, sz * 8);
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355 | }
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356 |
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357 | int32_t rg = (int32_t)(off % 4);
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358 | int32_t un = (int32_t)(off / 4);
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359 |
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360 | uint32_t rv;
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361 |
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362 | switch (rg) {
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363 | case REG_IER_ISR:
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364 | rv = (uint32_t)(0xc0 | (state[un].rdr_ok ? 0x01 : 0x00));
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365 | state[un].irq_r = false;
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366 | state[un].irq_t = false;
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367 | ver2("ISR[%d] 0x%02x", un, rv);
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368 | break;
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369 |
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370 | case REG_TDR_RDR:
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371 | rv = state[un].rdr;
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372 | state[un].rdr_ok = false;
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373 | ver2("RDR[%d] 0x%02x", un, rv);
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374 | break;
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375 |
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376 | default:
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377 | rv = 0x00;
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378 | break;
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379 | }
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380 |
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381 | return rv;
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382 | }
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383 |
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384 | void ser_write(uint32_t off, int32_t sz, uint32_t val)
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385 | {
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386 | ver2("ser wr %u:%d 0x%0*x", off, sz * 8, sz * 2, val);
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387 |
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388 | if (sz != 1 || off > 7) {
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389 | fail("invalid ser wr %u:%d", off, sz * 8);
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390 | }
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391 |
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392 | int32_t rg = (int32_t)(off % 4);
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393 | int32_t un = (int32_t)(off / 4);
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394 |
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395 | switch (rg) {
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396 | case REG_TDR_RDR:
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397 | ver2("TDR[%d] 0x%02x", un, val);
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398 | echo((uint8_t)val);
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399 | state[un].irq_t = true;
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400 | break;
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401 |
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402 | default:
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403 | break;
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404 | }
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405 | }
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