Mercurial > repos > simple16
annotate src/main.c @ 8:5176efdda5ae
Initial work on VDP emulation
author | Michael Pavone <pavone@retrodev.com> |
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date | Sun, 27 Mar 2016 00:24:31 -0700 |
parents | 7e44f7d5810b |
children | 04d8efe7a1f0 |
rev | line source |
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0
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Initial commit. CPU working well enough for simple hello world program.
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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 |
8
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8 #define CYCLES_PER_FRAME (832*262) |
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9 |
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10 uint8_t rom[48 * 1024]; |
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11 uint8_t ram[16 * 1024]; |
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12 |
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13 enum { |
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14 PORT_CONTROLLER_1, |
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15 PORT_CONTROLLER_2, |
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16 PORT_CONTROLLER_3, |
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17 PORT_CONTROLLER_4, |
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18 PORT_FREQUENCY_A, |
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19 PORT_FREQUENCY_B, |
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20 PORT_FREQUENCY_C, |
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21 PORT_FREQUENCY_D, |
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22 PORT_VOLUME_AB, |
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23 PORT_VOLUME_CD, |
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24 PORT_TIMER, |
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25 PORT_SERIAL, |
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26 PORT_VERTICAL, |
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27 PORT_HORIZONTAL, |
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28 PORT_VRAM_ADDRESS, |
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29 PORT_VRAM_DATA |
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30 }; |
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31 |
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32 typedef struct { |
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33 cpu *proc; |
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34 vdp video; |
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35 } console; |
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36 |
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37 void debug_port_write(cpu *context, uint8_t port, uint16_t value) |
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38 { |
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39 putchar(value); |
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40 } |
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41 |
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42 uint16_t debug_port_read(cpu *context, uint8_t port) |
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43 { |
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44 return getchar(); |
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45 } |
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46 |
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47 void vertical_port_write(cpu *context, uint8_t port, uint16_t value) |
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48 { |
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49 console *system = context->system; |
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50 vdp_run(&system->video, context->cycles); |
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51 system->video.vscroll = value; |
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52 } |
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53 |
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54 uint16_t vertical_port_read(cpu *context, uint8_t port) |
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55 { |
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56 console *system = context->system; |
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57 vdp_run(&system->video, context->cycles); |
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58 return system->video.vcounter; |
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59 } |
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60 |
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61 void horizontal_port_write(cpu *context, uint8_t port, uint16_t value) |
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62 { |
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63 console *system = context->system; |
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64 vdp_run(&system->video, context->cycles); |
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65 system->video.hscroll = value; |
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66 } |
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67 |
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68 uint16_t horizontal_port_read(cpu *context, uint8_t port) |
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69 { |
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70 console *system = context->system; |
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71 vdp_run(&system->video, context->cycles); |
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72 return system->video.hcounter; |
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73 } |
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74 |
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75 void address_port_write(cpu *context, uint8_t port, uint16_t value) |
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76 { |
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77 console *system = context->system; |
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78 vdp_run(&system->video, context->cycles); |
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79 vdp_write_address(&system->video, value); |
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80 } |
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81 |
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82 uint16_t address_port_read(cpu *context, uint8_t port) |
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83 { |
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84 console *system = context->system; |
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85 vdp_run(&system->video, context->cycles); |
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86 return system->video.status; |
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87 } |
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88 |
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89 void data_port_write(cpu *context, uint8_t port, uint16_t value) |
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90 { |
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91 console *system = context->system; |
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92 vdp_run(&system->video, context->cycles); |
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93 vdp_write_data(&system->video, value); |
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94 } |
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95 |
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96 memory_region regions[] = { |
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97 {rom, 0, sizeof(rom)-1, MEM_READ}, |
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98 {ram, sizeof(rom), sizeof(rom)-1+sizeof(ram), MEM_READ}, |
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99 }; |
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100 |
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101 void run_console(console *context) |
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102 { |
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103 for(;;) |
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104 { |
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105 run_cpu(context->proc, CYCLES_PER_FRAME); |
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106 vdp_run(&context->video, CYCLES_PER_FRAME); |
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107 context->proc->cycles -= CYCLES_PER_FRAME; |
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108 context->video.cycles -= CYCLES_PER_FRAME; |
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109 } |
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110 } |
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111 |
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112 |
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113 |
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114 int main(int argc, char **argv) |
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115 { |
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116 if (argc < 2) { |
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117 fputs("usage: s16 FILE\n", stderr); |
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118 return 1; |
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119 } |
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120 FILE *f = fopen(argv[1], "rb"); |
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121 if (!f) { |
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122 fprintf(stderr, "Failed to open %s for reading\n", argv[1]); |
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123 return 1; |
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124 } |
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125 |
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126 size_t read; |
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127 if ((read = fread(rom, 1, sizeof(rom), f)) < sizeof(rom)) { |
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128 memset(rom + read, 0xFF, sizeof(rom)-read); |
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129 } |
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130 console context; |
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131 context.proc = alloc_cpu(10, sizeof(regions)/sizeof(memory_region), regions); |
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132 context.proc->system = &context; |
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133 vdp_init(&context.video, 2); |
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134 context.proc->port_handlers[PORT_SERIAL].write = debug_port_write; |
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135 context.proc->port_handlers[PORT_SERIAL].read = debug_port_read; |
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136 context.proc->port_handlers[PORT_VERTICAL].write = vertical_port_write; |
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137 context.proc->port_handlers[PORT_VERTICAL].read = vertical_port_read; |
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138 context.proc->port_handlers[PORT_HORIZONTAL].write = horizontal_port_write; |
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139 context.proc->port_handlers[PORT_HORIZONTAL].read = horizontal_port_read; |
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140 context.proc->port_handlers[PORT_VRAM_ADDRESS].write = address_port_write; |
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141 context.proc->port_handlers[PORT_VRAM_ADDRESS].read = address_port_read; |
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142 context.proc->port_handlers[PORT_VRAM_DATA].write = data_port_write; |
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143 run_console(&context); |
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144 return 0; |
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145 } |