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annotate src/main.c @ 10:9f575f77a157

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Fix parsing of hex literals in assembler
author Michael Pavone <pavone@retrodev.com>
date Sun, 27 Mar 2016 17:32:09 -0700
parents 5176efdda5ae
children 04d8efe7a1f0
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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
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
0
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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
0
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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)
0
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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;
0
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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;
5176efdda5ae Initial work on VDP emulation
Michael Pavone <pavone@retrodev.com>
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143 run_console(&context);
0
7e44f7d5810b Initial commit. CPU working well enough for simple hello world program.
Michael Pavone <pavone@retrodev.com>
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144 return 0;
7e44f7d5810b Initial commit. CPU working well enough for simple hello world program.
Michael Pavone <pavone@retrodev.com>
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145 }