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annotate src/main.c @ 24:4c9dbfa30a66

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Implemented audio
author Michael Pavone <pavone@retrodev.com>
date Thu, 31 Mar 2016 00:07:37 -0700
parents 04fc17376999
children fb14515266f4
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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0
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1 #include <stdint.h>
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2 #include <stdio.h>
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3 #include <stdlib.h>
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4 #include <string.h>
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5 #include "cpu.h"
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6 #include "vdp.h"
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7 #include "audio.h"
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8 #include "system.h"
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9
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10 #define CYCLES_PER_FRAME (832*262)
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11 #define MASTER_CLOCK 13056000
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12
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13 uint8_t rom[48 * 1024];
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14 uint8_t ram[16 * 1024];
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15
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16 enum {
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17 PORT_CONTROLLER_1,
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18 PORT_CONTROLLER_2,
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19 PORT_CONTROLLER_3,
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20 PORT_CONTROLLER_4,
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21 PORT_FREQUENCY_A,
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22 PORT_FREQUENCY_B,
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23 PORT_FREQUENCY_C,
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24 PORT_FREQUENCY_D,
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25 PORT_VOLUME_AB,
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26 PORT_VOLUME_CD,
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27 PORT_TIMER,
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28 PORT_SERIAL,
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29 PORT_VERTICAL,
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30 PORT_HORIZONTAL,
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31 PORT_VRAM_ADDRESS,
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32 PORT_VRAM_DATA
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33 };
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34
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35 typedef struct {
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36 cpu *proc;
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37 vdp video;
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38 audio *audio;
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39 } console;
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40
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41 void debug_port_write(cpu *context, uint8_t port, uint16_t value)
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42 {
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43 putchar(value);
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44 }
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45
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46 uint16_t debug_port_read(cpu *context, uint8_t port)
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47 {
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48 return getchar();
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49 }
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50
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51 void vertical_port_write(cpu *context, uint8_t port, uint16_t value)
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52 {
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53 console *system = context->system;
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54 vdp_run(&system->video, context->cycles);
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55 system->video.vscroll = value;
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56 }
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57
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58 uint16_t vertical_port_read(cpu *context, uint8_t port)
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59 {
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60 console *system = context->system;
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61 vdp_run(&system->video, context->cycles);
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62 return system->video.vcounter;
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63 }
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64
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65 void horizontal_port_write(cpu *context, uint8_t port, uint16_t value)
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66 {
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67 console *system = context->system;
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68 vdp_run(&system->video, context->cycles);
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69 vdp_write_hscroll(&system->video, value);
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70 }
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71
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72 uint16_t horizontal_port_read(cpu *context, uint8_t port)
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73 {
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74 console *system = context->system;
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75 vdp_run(&system->video, context->cycles);
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76 return system->video.hcounter;
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77 }
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78
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79 void address_port_write(cpu *context, uint8_t port, uint16_t value)
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80 {
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81 console *system = context->system;
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82 vdp_run(&system->video, context->cycles);
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83 vdp_write_address(&system->video, value);
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84 }
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85
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86 uint16_t address_port_read(cpu *context, uint8_t port)
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87 {
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88 console *system = context->system;
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89 vdp_run(&system->video, context->cycles);
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90 return system->video.status;
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91 }
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92
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93 void data_port_write(cpu *context, uint8_t port, uint16_t value)
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94 {
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95 console *system = context->system;
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96 vdp_run(&system->video, context->cycles);
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97 vdp_write_data(&system->video, value);
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98 }
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99
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100 void frequency_port_write(cpu *context, uint8_t port, uint16_t value)
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101 {
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102 console *system = context->system;
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103 audio_run(system->audio, context->cycles);
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104 audio_write_freq(system->audio, port - PORT_FREQUENCY_A, value);
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105 }
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106
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107 void volume_port_write(cpu *context, uint8_t port, uint16_t value)
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108 {
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109 console *system = context->system;
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110 audio_run(system->audio, context->cycles);
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111 audio_write_vol(system->audio, port - PORT_VOLUME_AB, value);
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112 }
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113
0
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114 memory_region regions[] = {
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115 {rom, 0, sizeof(rom)-1, MEM_READ},
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116 {ram, sizeof(rom), sizeof(rom)-1+sizeof(ram), MEM_READ},
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117 };
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118
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119 void run_console(console *context)
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120 {
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121 for(;;)
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122 {
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123 run_cpu(context->proc, CYCLES_PER_FRAME);
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124 audio_run(context->audio, CYCLES_PER_FRAME);
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125 vdp_run(&context->video, CYCLES_PER_FRAME);
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126 context->proc->cycles -= CYCLES_PER_FRAME;
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127 context->video.cycles -= CYCLES_PER_FRAME;
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128 context->audio->cycles -= CYCLES_PER_FRAME;
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129 system_poll_events();
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130 }
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131 }
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132
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133 int main(int argc, char **argv)
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134 {
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135 if (argc < 2) {
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136 fputs("usage: s16 FILE\n", stderr);
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137 return 1;
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138 }
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139 FILE *f = fopen(argv[1], "rb");
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140 if (!f) {
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141 fprintf(stderr, "Failed to open %s for reading\n", argv[1]);
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142 return 1;
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143 }
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144
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145 size_t read;
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146 if ((read = fread(rom, 1, sizeof(rom), f)) < sizeof(rom)) {
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147 memset(rom + read, 0xFF, sizeof(rom)-read);
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148 }
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149 console context;
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150 context.proc = alloc_cpu(10, sizeof(regions)/sizeof(memory_region), regions);
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151 context.proc->system = &context;
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152 vdp_init(&context.video, 2);
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153 context.proc->port_handlers[PORT_FREQUENCY_A].write = frequency_port_write;
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154 context.proc->port_handlers[PORT_FREQUENCY_B].write = frequency_port_write;
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155 context.proc->port_handlers[PORT_FREQUENCY_C].write = frequency_port_write;
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156 context.proc->port_handlers[PORT_FREQUENCY_D].write = frequency_port_write;
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157 context.proc->port_handlers[PORT_VOLUME_AB].write = volume_port_write;
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158 context.proc->port_handlers[PORT_VOLUME_CD].write = volume_port_write;
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159 context.proc->port_handlers[PORT_SERIAL].write = debug_port_write;
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160 context.proc->port_handlers[PORT_SERIAL].read = debug_port_read;
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161 context.proc->port_handlers[PORT_VERTICAL].write = vertical_port_write;
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162 context.proc->port_handlers[PORT_VERTICAL].read = vertical_port_read;
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163 context.proc->port_handlers[PORT_HORIZONTAL].write = horizontal_port_write;
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164 context.proc->port_handlers[PORT_HORIZONTAL].read = horizontal_port_read;
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165 context.proc->port_handlers[PORT_VRAM_ADDRESS].write = address_port_write;
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166 context.proc->port_handlers[PORT_VRAM_ADDRESS].read = address_port_read;
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167 context.proc->port_handlers[PORT_VRAM_DATA].write = data_port_write;
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04d8efe7a1f0 Initial stab at video output and background color rendering. Fixed address decoding in address port write handler.
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parents: 8
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168
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169 if (!system_init(640, 480, 48000)) {
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170 return 1;
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171 }
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172
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173 context.audio = alloc_audio(MASTER_CLOCK, 17, system_sample_rate(), system_buffer_size());
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174
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175 run_console(&context);
0
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176 return 0;
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177 }