1 | /*
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2 | * Copyright (C) 2017-2018 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(mid_verbose, 0, __VA_ARGS__)
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21 | #define ver2(...) _ver(mid_verbose, 1, __VA_ARGS__)
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22 | #define ver3(...) _ver(mid_verbose, 2, __VA_ARGS__)
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23 |
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24 | int32_t mid_verbose = 0;
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25 |
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26 | #define REG_IER_ISR 0
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27 | #define REG_CFR_SR 1
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28 | #define REG_CDR_TBR 2
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29 | #define REG_TDR_RDR 3
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30 |
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31 | #define BUF_SZ 256
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32 |
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33 | typedef struct {
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34 | int32_t buf_hd;
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35 | int32_t buf_tl;
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36 | uint8_t buf[BUF_SZ];
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37 | bool irq_r;
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38 | bool irq_t;
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39 | bool rdr_ok;
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40 | uint8_t rdr;
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41 | } state_t;
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42 |
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43 | static state_t state[] = {
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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 | { .buf_hd = 0, .buf_tl = 0, .irq_r = false, .irq_t = false, .rdr_ok = false, .rdr = 0x00 }
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46 | };
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47 |
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48 | static struct RtMidiWrapper *mid_in = NULL;
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49 |
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50 | static void xmit(int32_t un)
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51 | {
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52 | int32_t i = state[un].buf_tl;
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53 | ver2("mid xmit %d %d", i, state[un].buf_hd);
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54 |
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55 | if (i >= state[un].buf_hd) {
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56 | return;
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57 | }
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58 |
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59 | uint8_t byte = state[un].buf[i % BUF_SZ];
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60 | ver2("mid xmit 0x%02x", byte);
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61 |
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62 | state[un].rdr = byte;
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63 | state[un].rdr_ok = true;
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64 | state[un].irq_r = true;
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65 |
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66 | state[un].buf_tl = i + 1;
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67 |
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68 | if (state[un].buf_tl >= BUF_SZ) {
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69 | state[un].buf_hd -= BUF_SZ;
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70 | state[un].buf_tl -= BUF_SZ;
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71 | ver2("mid adj %d %d", state[un].buf_tl, state[un].buf_hd);
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72 | }
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73 | }
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74 |
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75 | static void out(int32_t un, uint8_t c)
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76 | {
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77 | if (SDL_LockMutex(cpu_mutex) < 0) {
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78 | fail("SDL_LockMutex() failed: %s", SDL_GetError());
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79 | }
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80 |
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81 | int32_t i = state[un].buf_hd;
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82 | ver2("mid out %d %d 0x%02x", state[un].buf_tl, i, c);
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83 |
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84 | if (i >= state[un].buf_tl + BUF_SZ) {
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85 | err("midi port %d losing data", un);
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86 | return;
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87 | }
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88 |
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89 | state[un].buf[i % BUF_SZ] = c;
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90 | state[un].buf_hd = i + 1;
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91 |
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92 | if (!state[un].irq_r && !state[un].rdr_ok) {
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93 | xmit(un);
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94 | }
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95 |
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96 | if (SDL_UnlockMutex(cpu_mutex) < 0) {
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97 | fail("SDL_UnlockMutex() failed: %s", SDL_GetError());
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98 | }
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99 | }
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100 |
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101 | static void callback(double time, const uint8_t *midi, void *data)
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102 | {
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103 | (void)data;
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104 |
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105 | int32_t len;
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106 |
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107 | switch (midi[0] & 0xf0) {
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108 | case 0x80: // note on
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109 | case 0x90: // note off
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110 | case 0xa0: // polyphonic key pressure
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111 | case 0xb0: // control change
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112 | case 0xe0: // pitch bend change
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113 | len = 3;
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114 | break;
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115 |
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116 | case 0xc0: // program change
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117 | case 0xd0: // channel pressure
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118 | len = 2;
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119 | break;
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120 |
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121 | case 0xf0:
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122 | switch (midi[0]) {
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123 | case 0xf0: // system exclusive
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124 | case 0xf4: // undefined
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125 | case 0xf5: // undefined
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126 | case 0xf7: // end of exclusive
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127 | case 0xf9: // undefined
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128 | case 0xfd: // undefined
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129 | len = -1;
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130 | break;
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131 |
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132 | case 0xf1: // MIDI time code quarter frame
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133 | case 0xf3: // song select
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134 | len = 2;
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135 | break;
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136 |
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137 | case 0xf2: // song position pointer
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138 | len = 3;
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139 | break;
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140 |
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141 | case 0xf6: // tune request
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142 | case 0xf8: // timing clock
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143 | case 0xfa: // start
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144 | case 0xfb: // continue
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145 | case 0xfc: // stop
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146 | case 0xfe: // active sensing
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147 | case 0xff: // reset
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148 | len = 1;
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149 | break;
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150 | }
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151 |
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152 | break;
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153 | }
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154 |
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155 | ver2("time %f", time);
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156 |
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157 | for (int32_t i = 0; i < len; ++i) {
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158 | ver2("midi[%d] 0x%02x", i, midi[i]);
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159 | out(0, midi[i]);
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160 | }
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161 | }
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162 |
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163 | void mid_init(void)
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164 | {
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165 | ver("mid init");
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166 |
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167 | if (mid_port < 0) {
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168 | ver("no MIDI requested");
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169 | return;
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170 | }
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171 |
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172 | mid_in = rtmidi_in_create_default();
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173 |
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174 | if (!mid_in->ok) {
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175 | fail("rtmidi_in_create_default() failed: %s", mid_in->msg);
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176 | }
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177 |
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178 | int32_t n_ports = (int32_t)rtmidi_get_port_count(mid_in);
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179 |
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180 | if (n_ports == 0) {
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181 | inf("no MIDI ports\n");
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182 | rtmidi_in_free(mid_in);
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183 | mid_in = NULL;
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184 | return;
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185 | }
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186 |
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187 | if (mid_port >= n_ports) {
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188 | fail("invalid MIDI port %d selected (%d available)", mid_port, n_ports);
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189 | }
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190 |
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191 | const char *name = rtmidi_get_port_name(mid_in, (uint32_t)mid_port);
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192 | rtmidi_open_port(mid_in, (uint32_t)mid_port, name);
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193 |
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194 | if (!mid_in->ok) {
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195 | fail("error while opening MIDI port %d (%s): %s", mid_port, name, mid_in->msg);
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196 | }
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197 |
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198 | inf("using MIDI port %d (%s)", mid_port, name);
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199 |
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200 | rtmidi_in_set_callback(mid_in, callback, mid_in->data);
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201 |
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202 | if (!mid_in->ok) {
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203 | fail("rtmidi_in_set_callback() failed: %s", mid_in->msg);
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204 | }
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205 | }
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206 |
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207 | void mid_quit(void)
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208 | {
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209 | ver("mid quit");
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210 |
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211 | if (mid_in == NULL) {
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212 | return;
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213 | }
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214 |
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215 | rtmidi_close_port(mid_in);
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216 | rtmidi_in_free(mid_in);
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217 | }
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218 |
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219 | bool mid_exec(void)
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220 | {
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221 | ver3("mid exec");
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222 | return state[0].irq_r || state[0].irq_t || state[1].irq_r || state[1].irq_t;
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223 | }
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224 |
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225 | uint32_t mid_read(uint32_t off, int32_t sz)
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226 | {
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227 | ver2("mid rd %u:%d", off, sz * 8);
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228 |
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229 | if (sz != 1 || off > 7) {
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230 | fail("invalid mid rd %u:%d", off, sz * 8);
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231 | }
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232 |
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233 | int32_t rg = (int32_t)(off % 4);
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234 | int32_t un = (int32_t)(off / 4);
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235 |
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236 | uint32_t rv;
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237 |
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238 | switch (rg) {
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239 | case REG_IER_ISR:
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240 | rv = (uint32_t)(0xc0 | (state[un].rdr_ok ? 0x01 : 0x00));
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241 | state[un].irq_r = false;
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242 | state[un].irq_t = false;
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243 | ver2("ISR[%d] 0x%02x", un, rv);
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244 | break;
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245 |
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246 | case REG_TDR_RDR:
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247 | rv = state[un].rdr;
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248 | state[un].rdr_ok = false;
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249 | ver2("RDR[%d] 0x%02x", un, rv);
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250 | break;
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251 |
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252 | default:
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253 | rv = 0x00;
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254 | break;
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255 | }
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256 |
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257 | if (!state[un].irq_r && !state[un].rdr_ok) {
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258 | xmit(un);
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259 | }
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260 |
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261 | return rv;
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262 | }
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263 |
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264 | void mid_write(uint32_t off, int32_t sz, uint32_t val)
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265 | {
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266 | ver2("mid wr %u:%d 0x%0*x", off, sz * 8, sz * 2, val);
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267 |
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268 | if (sz != 1 || off > 7) {
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269 | fail("invalid mid wr %u:%d", off, sz * 8);
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270 | }
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271 |
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272 | int32_t rg = (int32_t)(off % 4);
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273 | int32_t un = (int32_t)(off / 4);
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274 |
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275 | switch (rg) {
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276 | case REG_CFR_SR:
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277 | ver2("CFR[%d] 0x%02x", un, val);
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278 |
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279 | if (un == 1) {
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280 | fdd_set_side((int32_t)val & 0x01);
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281 | }
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282 | else {
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283 | fdd_set_sel((int32_t)val & 0x01);
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284 | }
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285 |
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286 | break;
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287 |
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288 | default:
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289 | break;
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290 | }
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291 | }
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292 |
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293 | void mid_list(void)
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294 | {
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295 | mid_in = rtmidi_in_create_default();
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296 |
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297 | if (!mid_in->ok) {
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298 | fprintf(stderr, "rtmidi_in_create_default() failed: %s\n", mid_in->msg);
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299 | return;
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300 | }
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301 |
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302 | uint32_t n_ports = rtmidi_get_port_count(mid_in);
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303 |
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304 | if (n_ports == 0) {
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305 | fprintf(stdout, "no available MIDI ports\n");
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306 | }
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307 | else {
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308 | for (uint32_t i = 0; i < n_ports; i++) {
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309 | fprintf(stdout, "port %u: %s\n", i, rtmidi_get_port_name(mid_in, i));
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310 | }
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311 | }
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312 |
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313 | rtmidi_in_free(mid_in);
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314 | }
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