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 | #include <rtmidi/rtmidi_c.h>
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20 |
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21 | #define ver(...) _ver(mid_verbose, 0, __VA_ARGS__)
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22 | #define ver2(...) _ver(mid_verbose, 1, __VA_ARGS__)
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23 | #define ver3(...) _ver(mid_verbose, 2, __VA_ARGS__)
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24 |
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25 | #define REG_IER_ISR 0
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26 | #define REG_CFR_SR 1
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27 | #define REG_CDR_TBR 2
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28 | #define REG_TDR_RDR 3
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29 |
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30 | #define BUF_SZ 256
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31 |
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32 | typedef struct {
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33 | int32_t buf_hd;
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34 | int32_t buf_tl;
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35 | uint8_t buf[BUF_SZ];
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36 | bool irq_r;
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37 | bool irq_t;
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38 | bool rdr_ok;
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39 | uint8_t rdr;
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40 | } state_t;
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41 |
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42 | static state_t state[] = {
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43 | { .buf_hd = 0, .buf_tl = 0, .irq_r = false, .irq_t = false, .rdr_ok = false, .rdr = 0x00 },
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44 | { .buf_hd = 0, .buf_tl = 0, .irq_r = false, .irq_t = false, .rdr_ok = false, .rdr = 0x00 }
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45 | };
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46 |
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47 | int32_t mid_verbose = 0;
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48 |
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49 | struct RtMidiWrapper* midiin;
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50 |
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51 | static void xmit(int32_t un)
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52 | {
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53 | int32_t i = state[un].buf_tl;
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54 | ver2("mid xmit %d %d", i, state[un].buf_hd);
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55 |
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56 | if (i >= state[un].buf_hd) {
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57 | return;
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58 | }
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59 |
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60 | uint8_t byte = state[un].buf[i % BUF_SZ];
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61 | ver2("mid xmit 0x%02x", byte);
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62 |
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63 | state[un].rdr = byte;
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64 | state[un].rdr_ok = true;
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65 | state[un].irq_r = true;
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66 |
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67 | state[un].buf_tl = i + 1;
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68 |
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69 | if (state[un].buf_tl >= BUF_SZ) {
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70 | state[un].buf_hd -= BUF_SZ;
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71 | state[un].buf_tl -= BUF_SZ;
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72 | ver2("mid adj %d %d", state[un].buf_tl, state[un].buf_hd);
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73 | }
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74 | }
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75 |
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76 | static void out_lk(int32_t un, uint8_t c)
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77 | {
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78 | int32_t i = state[un].buf_hd;
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79 | ver2("mid out %d %d 0x%02x", state[un].buf_tl, i, c);
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80 |
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81 | if (i >= state[un].buf_tl + BUF_SZ) {
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82 | err("midi port %d losing data", un);
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83 | return;
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84 | }
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85 |
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86 | state[un].buf[i % BUF_SZ] = c;
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87 | state[un].buf_hd = i + 1;
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88 |
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89 | if (!state[un].irq_r && !state[un].rdr_ok) {
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90 | xmit(un);
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91 | }
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92 | }
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93 |
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94 | static void out(int32_t un, uint8_t c)
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95 | {
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96 | if (SDL_LockMutex(cpu_mutex) < 0) {
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97 | fail("SDL_LockMutex() failed: %s", SDL_GetError());
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98 | }
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99 |
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100 | out_lk(un, c);
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101 |
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102 | if (SDL_UnlockMutex(cpu_mutex) < 0) {
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103 | fail("SDL_UnlockMutex() failed: %s", SDL_GetError());
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104 | }
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105 | }
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106 |
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107 | static void midi_callback(double timeStamp, const unsigned char* message, size_t size, void *userData) {
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108 | (void) size;
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109 | (void) userData;
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110 |
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111 | ver2("Timestamp %f\n", timeStamp);
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112 |
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113 | for (uint8_t i = 0; i < sizeof(message); i++) {
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114 | ver2("Message %i %u", i, (uint8_t) message[i]);
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115 | out(0, message[i]);
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116 | }
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117 | }
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118 |
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119 | void mid_init(void)
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120 | {
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121 | ver("mid init");
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122 |
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123 | midiin = rtmidi_in_create_default();
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124 | ver2("%p", midiin->ptr);
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125 | // check if null
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126 | uint32_t portcount = rtmidi_get_port_count(midiin);
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127 | ver2("%d", midiin->ok);
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128 |
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129 | if (portcount == 0) {
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130 | midiin = NULL;
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131 | ver2("no midi ports\n");
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132 | return;
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133 | }
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134 |
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135 | for (uint32_t i = 0; i < portcount; i++) {
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136 | ver2("Port %d: %s", i, rtmidi_get_port_name(midiin, i));
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137 | }
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138 |
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139 | rtmidi_open_port(midiin, 0, rtmidi_get_port_name(midiin, 0));
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140 | if(!midiin->ok) {
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141 | fail("Failed to open Midi port");
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142 | }
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143 |
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144 | rtmidi_in_set_callback(midiin, midi_callback, midiin->data);
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145 | if(!midiin->ok) {
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146 | fail("Failed to set Midi Callback");
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147 | }
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148 | }
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149 |
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150 | void mid_quit(void)
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151 | {
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152 | if(midiin) {
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153 | rtmidi_close_port(midiin);
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154 | rtmidi_in_free(midiin);
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155 | }
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156 |
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157 | ver("mid quit");
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158 | }
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159 |
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160 | bool mid_exec(void)
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161 | {
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162 | ver3("mid exec");
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163 | return state[0].irq_r || state[0].irq_t || state[1].irq_r || state[1].irq_t;
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164 | }
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165 |
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166 | uint32_t mid_read(uint32_t off, int32_t sz)
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167 | {
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168 | ver2("mid rd %u:%d", off, sz * 8);
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169 |
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170 | if (sz != 1 || off > 7) {
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171 | fail("invalid mid rd %u:%d", off, sz * 8);
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172 | }
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173 |
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174 | int32_t rg = (int32_t)(off % 4);
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175 | int32_t un = (int32_t)(off / 4);
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176 |
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177 | uint32_t rv;
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178 |
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179 | switch (rg) {
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180 | case REG_IER_ISR:
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181 | rv = (uint32_t)(0xc0 | (state[un].rdr_ok ? 0x01 : 0x00));
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182 | state[un].irq_r = false;
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183 | state[un].irq_t = false;
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184 | ver2("ISR[%d] 0x%02x", un, rv);
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185 | break;
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186 |
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187 | case REG_TDR_RDR:
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188 | rv = state[un].rdr;
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189 | state[un].rdr_ok = false;
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190 | ver2("RDR[%d] 0x%02x", un, rv);
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191 | break;
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192 |
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193 | default:
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194 | rv = 0x00;
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195 | break;
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196 | }
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197 |
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198 | if (!state[un].irq_r && !state[un].rdr_ok) {
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199 | xmit(un);
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200 | }
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201 |
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202 | return rv;
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203 | }
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204 |
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205 | void mid_write(uint32_t off, int32_t sz, uint32_t val)
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206 | {
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207 | ver2("mid wr %u:%d 0x%0*x", off, sz * 8, sz * 2, val);
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208 |
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209 | if (sz != 1 || off > 7) {
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210 | fail("invalid mid wr %u:%d", off, sz * 8);
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211 | }
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212 |
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213 | int32_t rg = (int32_t)(off % 4);
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214 | int32_t un = (int32_t)(off / 4);
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215 |
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216 | switch (rg) {
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217 | case REG_CFR_SR:
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218 | ver2("CFR[%d] 0x%02x", un, val);
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219 |
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220 | if (un == 1) {
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221 | fdd_set_side((int32_t)val & 0x01);
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222 | }
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223 | else {
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224 | fdd_set_sel((int32_t)val & 0x01);
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225 | }
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226 |
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227 | break;
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228 |
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229 | default:
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230 | break;
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231 | }
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232 | }
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