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annotate src/main.c @ 25:fb14515266f4

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Implemented timer and timer interrupts. Added get/setvbr instructions. Fixed assembler bug. Moved mnemonics into a separate source file
author Michael Pavone <pavone@retrodev.com>
date Thu, 31 Mar 2016 23:25:52 -0700
parents 4c9dbfa30a66
children 083347ccd508
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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 "timer.h"
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9 #include "system.h"
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10
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11 #define CYCLES_PER_FRAME (832*262)
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12 #define MASTER_CLOCK 13056000
0
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13
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14 uint8_t rom[48 * 1024];
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15 uint8_t ram[16 * 1024];
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16
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17 enum {
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18 PORT_CONTROLLER_1,
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19 PORT_CONTROLLER_2,
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20 PORT_CONTROLLER_3,
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21 PORT_CONTROLLER_4,
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22 PORT_FREQUENCY_A,
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23 PORT_FREQUENCY_B,
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24 PORT_FREQUENCY_C,
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25 PORT_FREQUENCY_D,
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26 PORT_VOLUME_AB,
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27 PORT_VOLUME_CD,
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28 PORT_TIMER,
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29 PORT_SERIAL,
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30 PORT_VERTICAL,
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31 PORT_HORIZONTAL,
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32 PORT_VRAM_ADDRESS,
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33 PORT_VRAM_DATA
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34 };
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35
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36 typedef struct {
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37 cpu *proc;
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38 audio *audio;
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39 timer timer;
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40 vdp video;
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41 } console;
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42
0
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43 void debug_port_write(cpu *context, uint8_t port, uint16_t value)
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44 {
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45 putchar(value);
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46 }
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47
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48 uint16_t debug_port_read(cpu *context, uint8_t port)
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49 {
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50 return getchar();
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51 }
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52
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53 void vertical_port_write(cpu *context, uint8_t port, uint16_t value)
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54 {
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55 console *system = context->system;
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56 vdp_run(&system->video, context->cycles);
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57 system->video.vscroll = value;
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58 }
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59
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60 uint16_t vertical_port_read(cpu *context, uint8_t port)
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61 {
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62 console *system = context->system;
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63 vdp_run(&system->video, context->cycles);
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64 return system->video.vcounter;
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65 }
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66
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67 void horizontal_port_write(cpu *context, uint8_t port, uint16_t value)
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68 {
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69 console *system = context->system;
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70 vdp_run(&system->video, context->cycles);
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71 vdp_write_hscroll(&system->video, value);
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72 }
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73
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74 uint16_t horizontal_port_read(cpu *context, uint8_t port)
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75 {
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76 console *system = context->system;
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77 vdp_run(&system->video, context->cycles);
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78 return system->video.hcounter;
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79 }
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80
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81 void address_port_write(cpu *context, uint8_t port, uint16_t value)
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82 {
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83 console *system = context->system;
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84 vdp_run(&system->video, context->cycles);
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85 vdp_write_address(&system->video, value);
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86 }
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87
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88 uint16_t address_port_read(cpu *context, uint8_t port)
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89 {
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90 console *system = context->system;
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91 vdp_run(&system->video, context->cycles);
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92 return system->video.status;
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93 }
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94
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95 void data_port_write(cpu *context, uint8_t port, uint16_t value)
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96 {
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97 console *system = context->system;
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98 vdp_run(&system->video, context->cycles);
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99 vdp_write_data(&system->video, value);
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100 }
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101
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102 void frequency_port_write(cpu *context, uint8_t port, uint16_t value)
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103 {
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104 console *system = context->system;
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105 audio_run(system->audio, context->cycles);
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106 audio_write_freq(system->audio, port - PORT_FREQUENCY_A, value);
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107 }
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108
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109 void volume_port_write(cpu *context, uint8_t port, uint16_t value)
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110 {
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111 console *system = context->system;
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112 audio_run(system->audio, context->cycles);
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113 audio_write_vol(system->audio, port - PORT_VOLUME_AB, value);
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114 }
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115
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116 void timer_port_write(cpu *context, uint8_t port, uint16_t value)
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117 {
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118 console *system = context->system;
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119 timer_run(&system->timer, context->cycles);
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120 timer_write(&system->timer, value);
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121 uint32_t next_int = next_interrupt_cycle(context, (~context->pending_interrupts) & 3);
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122 if (next_int < context->current_target) {
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123 context->current_target = next_int;
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124 }
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125 }
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126
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127 uint32_t next_interrupt_cycle(cpu *context, uint8_t mask)
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128 {
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129 console *system = context->system;
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130 uint32_t next = 0xFFFFFFFF;
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131 if (mask & 1) {
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132 timer_run(&system->timer, context->cycles);
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133 next = timer_next_interrupt(&system->timer);
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134 }
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135 if (mask & 2) {
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136 vdp_run(&system->video, context->cycles);
fb14515266f4 Implemented timer and timer interrupts. Added get/setvbr instructions. Fixed assembler bug. Moved mnemonics into a separate source file
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parents: 24
diff changeset
137 //TODO: VBlank interrupt
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Michael Pavone <pavone@retrodev.com>
parents: 24
diff changeset
138 }
fb14515266f4 Implemented timer and timer interrupts. Added get/setvbr instructions. Fixed assembler bug. Moved mnemonics into a separate source file
Michael Pavone <pavone@retrodev.com>
parents: 24
diff changeset
139 return next;
fb14515266f4 Implemented timer and timer interrupts. Added get/setvbr instructions. Fixed assembler bug. Moved mnemonics into a separate source file
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parents: 24
diff changeset
140 }
fb14515266f4 Implemented timer and timer interrupts. Added get/setvbr instructions. Fixed assembler bug. Moved mnemonics into a separate source file
Michael Pavone <pavone@retrodev.com>
parents: 24
diff changeset
141
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Michael Pavone <pavone@retrodev.com>
parents: 24
diff changeset
142 uint8_t get_current_interrupts(cpu *context)
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parents: 24
diff changeset
143 {
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Michael Pavone <pavone@retrodev.com>
parents: 24
diff changeset
144 console *system = context->system;
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Michael Pavone <pavone@retrodev.com>
parents: 24
diff changeset
145 timer_run(&system->timer, context->cycles);
fb14515266f4 Implemented timer and timer interrupts. Added get/setvbr instructions. Fixed assembler bug. Moved mnemonics into a separate source file
Michael Pavone <pavone@retrodev.com>
parents: 24
diff changeset
146 uint8_t bits = 0;
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Michael Pavone <pavone@retrodev.com>
parents: 24
diff changeset
147 if (system->timer.pending) {
fb14515266f4 Implemented timer and timer interrupts. Added get/setvbr instructions. Fixed assembler bug. Moved mnemonics into a separate source file
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parents: 24
diff changeset
148 bits |= 1;
fb14515266f4 Implemented timer and timer interrupts. Added get/setvbr instructions. Fixed assembler bug. Moved mnemonics into a separate source file
Michael Pavone <pavone@retrodev.com>
parents: 24
diff changeset
149 }
fb14515266f4 Implemented timer and timer interrupts. Added get/setvbr instructions. Fixed assembler bug. Moved mnemonics into a separate source file
Michael Pavone <pavone@retrodev.com>
parents: 24
diff changeset
150 vdp_run(&system->video, context->cycles);
fb14515266f4 Implemented timer and timer interrupts. Added get/setvbr instructions. Fixed assembler bug. Moved mnemonics into a separate source file
Michael Pavone <pavone@retrodev.com>
parents: 24
diff changeset
151 //TODO: VBlank interrupt
fb14515266f4 Implemented timer and timer interrupts. Added get/setvbr instructions. Fixed assembler bug. Moved mnemonics into a separate source file
Michael Pavone <pavone@retrodev.com>
parents: 24
diff changeset
152 return bits;
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parents: 24
diff changeset
153 }
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parents: 24
diff changeset
154
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Michael Pavone <pavone@retrodev.com>
parents: 24
diff changeset
155 void ack_interrupt(cpu *context, int which)
fb14515266f4 Implemented timer and timer interrupts. Added get/setvbr instructions. Fixed assembler bug. Moved mnemonics into a separate source file
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parents: 24
diff changeset
156 {
fb14515266f4 Implemented timer and timer interrupts. Added get/setvbr instructions. Fixed assembler bug. Moved mnemonics into a separate source file
Michael Pavone <pavone@retrodev.com>
parents: 24
diff changeset
157 console *system = context->system;
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Michael Pavone <pavone@retrodev.com>
parents: 24
diff changeset
158 if (which == 0) {
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Michael Pavone <pavone@retrodev.com>
parents: 24
diff changeset
159 timer_run(&system->timer, context->cycles);
fb14515266f4 Implemented timer and timer interrupts. Added get/setvbr instructions. Fixed assembler bug. Moved mnemonics into a separate source file
Michael Pavone <pavone@retrodev.com>
parents: 24
diff changeset
160 system->timer.pending = 0;
fb14515266f4 Implemented timer and timer interrupts. Added get/setvbr instructions. Fixed assembler bug. Moved mnemonics into a separate source file
Michael Pavone <pavone@retrodev.com>
parents: 24
diff changeset
161 }
fb14515266f4 Implemented timer and timer interrupts. Added get/setvbr instructions. Fixed assembler bug. Moved mnemonics into a separate source file
Michael Pavone <pavone@retrodev.com>
parents: 24
diff changeset
162 //TODO: VBlank interrupt
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Michael Pavone <pavone@retrodev.com>
parents: 24
diff changeset
163 }
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Michael Pavone <pavone@retrodev.com>
parents: 24
diff changeset
164
0
7e44f7d5810b Initial commit. CPU working well enough for simple hello world program.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
165 memory_region regions[] = {
7e44f7d5810b Initial commit. CPU working well enough for simple hello world program.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
166 {rom, 0, sizeof(rom)-1, MEM_READ},
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Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
167 {ram, sizeof(rom), sizeof(rom)-1+sizeof(ram), MEM_READ},
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Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
168 };
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Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
169
8
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parents: 0
diff changeset
170 void run_console(console *context)
0
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Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
171 {
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Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
172 for(;;)
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Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
173 {
8
5176efdda5ae Initial work on VDP emulation
Michael Pavone <pavone@retrodev.com>
parents: 0
diff changeset
174 run_cpu(context->proc, CYCLES_PER_FRAME);
24
4c9dbfa30a66 Implemented audio
Michael Pavone <pavone@retrodev.com>
parents: 19
diff changeset
175 audio_run(context->audio, CYCLES_PER_FRAME);
8
5176efdda5ae Initial work on VDP emulation
Michael Pavone <pavone@retrodev.com>
parents: 0
diff changeset
176 vdp_run(&context->video, CYCLES_PER_FRAME);
25
fb14515266f4 Implemented timer and timer interrupts. Added get/setvbr instructions. Fixed assembler bug. Moved mnemonics into a separate source file
Michael Pavone <pavone@retrodev.com>
parents: 24
diff changeset
177 timer_run(&context->timer, CYCLES_PER_FRAME);
8
5176efdda5ae Initial work on VDP emulation
Michael Pavone <pavone@retrodev.com>
parents: 0
diff changeset
178 context->proc->cycles -= CYCLES_PER_FRAME;
5176efdda5ae Initial work on VDP emulation
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parents: 0
diff changeset
179 context->video.cycles -= CYCLES_PER_FRAME;
24
4c9dbfa30a66 Implemented audio
Michael Pavone <pavone@retrodev.com>
parents: 19
diff changeset
180 context->audio->cycles -= CYCLES_PER_FRAME;
25
fb14515266f4 Implemented timer and timer interrupts. Added get/setvbr instructions. Fixed assembler bug. Moved mnemonics into a separate source file
Michael Pavone <pavone@retrodev.com>
parents: 24
diff changeset
181 context->timer.cycles -= CYCLES_PER_FRAME;
16
ae58e7c3c328 Poll events regularly to avoid unresponsive app warnings. Handle quit event
Michael Pavone <pavone@retrodev.com>
parents: 11
diff changeset
182 system_poll_events();
0
7e44f7d5810b Initial commit. CPU working well enough for simple hello world program.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
183 }
7e44f7d5810b Initial commit. CPU working well enough for simple hello world program.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
184 }
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Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
185
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Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
186 int main(int argc, char **argv)
7e44f7d5810b Initial commit. CPU working well enough for simple hello world program.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
187 {
7e44f7d5810b Initial commit. CPU working well enough for simple hello world program.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
188 if (argc < 2) {
7e44f7d5810b Initial commit. CPU working well enough for simple hello world program.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
189 fputs("usage: s16 FILE\n", stderr);
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parents:
diff changeset
190 return 1;
7e44f7d5810b Initial commit. CPU working well enough for simple hello world program.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
191 }
7e44f7d5810b Initial commit. CPU working well enough for simple hello world program.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
192 FILE *f = fopen(argv[1], "rb");
7e44f7d5810b Initial commit. CPU working well enough for simple hello world program.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
193 if (!f) {
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Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
194 fprintf(stderr, "Failed to open %s for reading\n", argv[1]);
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Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
195 return 1;
7e44f7d5810b Initial commit. CPU working well enough for simple hello world program.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
196 }
7e44f7d5810b Initial commit. CPU working well enough for simple hello world program.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
197
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Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
198 size_t read;
7e44f7d5810b Initial commit. CPU working well enough for simple hello world program.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
199 if ((read = fread(rom, 1, sizeof(rom), f)) < sizeof(rom)) {
7e44f7d5810b Initial commit. CPU working well enough for simple hello world program.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
200 memset(rom + read, 0xFF, sizeof(rom)-read);
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Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
201 }
8
5176efdda5ae Initial work on VDP emulation
Michael Pavone <pavone@retrodev.com>
parents: 0
diff changeset
202 console context;
5176efdda5ae Initial work on VDP emulation
Michael Pavone <pavone@retrodev.com>
parents: 0
diff changeset
203 context.proc = alloc_cpu(10, sizeof(regions)/sizeof(memory_region), regions);
5176efdda5ae Initial work on VDP emulation
Michael Pavone <pavone@retrodev.com>
parents: 0
diff changeset
204 context.proc->system = &context;
5176efdda5ae Initial work on VDP emulation
Michael Pavone <pavone@retrodev.com>
parents: 0
diff changeset
205 vdp_init(&context.video, 2);
25
fb14515266f4 Implemented timer and timer interrupts. Added get/setvbr instructions. Fixed assembler bug. Moved mnemonics into a separate source file
Michael Pavone <pavone@retrodev.com>
parents: 24
diff changeset
206 timer_init(&context.timer, 16);
24
4c9dbfa30a66 Implemented audio
Michael Pavone <pavone@retrodev.com>
parents: 19
diff changeset
207 context.proc->port_handlers[PORT_FREQUENCY_A].write = frequency_port_write;
4c9dbfa30a66 Implemented audio
Michael Pavone <pavone@retrodev.com>
parents: 19
diff changeset
208 context.proc->port_handlers[PORT_FREQUENCY_B].write = frequency_port_write;
4c9dbfa30a66 Implemented audio
Michael Pavone <pavone@retrodev.com>
parents: 19
diff changeset
209 context.proc->port_handlers[PORT_FREQUENCY_C].write = frequency_port_write;
4c9dbfa30a66 Implemented audio
Michael Pavone <pavone@retrodev.com>
parents: 19
diff changeset
210 context.proc->port_handlers[PORT_FREQUENCY_D].write = frequency_port_write;
4c9dbfa30a66 Implemented audio
Michael Pavone <pavone@retrodev.com>
parents: 19
diff changeset
211 context.proc->port_handlers[PORT_VOLUME_AB].write = volume_port_write;
4c9dbfa30a66 Implemented audio
Michael Pavone <pavone@retrodev.com>
parents: 19
diff changeset
212 context.proc->port_handlers[PORT_VOLUME_CD].write = volume_port_write;
25
fb14515266f4 Implemented timer and timer interrupts. Added get/setvbr instructions. Fixed assembler bug. Moved mnemonics into a separate source file
Michael Pavone <pavone@retrodev.com>
parents: 24
diff changeset
213 context.proc->port_handlers[PORT_TIMER].write = timer_port_write;
8
5176efdda5ae Initial work on VDP emulation
Michael Pavone <pavone@retrodev.com>
parents: 0
diff changeset
214 context.proc->port_handlers[PORT_SERIAL].write = debug_port_write;
5176efdda5ae Initial work on VDP emulation
Michael Pavone <pavone@retrodev.com>
parents: 0
diff changeset
215 context.proc->port_handlers[PORT_SERIAL].read = debug_port_read;
5176efdda5ae Initial work on VDP emulation
Michael Pavone <pavone@retrodev.com>
parents: 0
diff changeset
216 context.proc->port_handlers[PORT_VERTICAL].write = vertical_port_write;
5176efdda5ae Initial work on VDP emulation
Michael Pavone <pavone@retrodev.com>
parents: 0
diff changeset
217 context.proc->port_handlers[PORT_VERTICAL].read = vertical_port_read;
5176efdda5ae Initial work on VDP emulation
Michael Pavone <pavone@retrodev.com>
parents: 0
diff changeset
218 context.proc->port_handlers[PORT_HORIZONTAL].write = horizontal_port_write;
5176efdda5ae Initial work on VDP emulation
Michael Pavone <pavone@retrodev.com>
parents: 0
diff changeset
219 context.proc->port_handlers[PORT_HORIZONTAL].read = horizontal_port_read;
5176efdda5ae Initial work on VDP emulation
Michael Pavone <pavone@retrodev.com>
parents: 0
diff changeset
220 context.proc->port_handlers[PORT_VRAM_ADDRESS].write = address_port_write;
5176efdda5ae Initial work on VDP emulation
Michael Pavone <pavone@retrodev.com>
parents: 0
diff changeset
221 context.proc->port_handlers[PORT_VRAM_ADDRESS].read = address_port_read;
5176efdda5ae Initial work on VDP emulation
Michael Pavone <pavone@retrodev.com>
parents: 0
diff changeset
222 context.proc->port_handlers[PORT_VRAM_DATA].write = data_port_write;
11
04d8efe7a1f0 Initial stab at video output and background color rendering. Fixed address decoding in address port write handler.
Michael Pavone <pavone@retrodev.com>
parents: 8
diff changeset
223
24
4c9dbfa30a66 Implemented audio
Michael Pavone <pavone@retrodev.com>
parents: 19
diff changeset
224 if (!system_init(640, 480, 48000)) {
11
04d8efe7a1f0 Initial stab at video output and background color rendering. Fixed address decoding in address port write handler.
Michael Pavone <pavone@retrodev.com>
parents: 8
diff changeset
225 return 1;
04d8efe7a1f0 Initial stab at video output and background color rendering. Fixed address decoding in address port write handler.
Michael Pavone <pavone@retrodev.com>
parents: 8
diff changeset
226 }
04d8efe7a1f0 Initial stab at video output and background color rendering. Fixed address decoding in address port write handler.
Michael Pavone <pavone@retrodev.com>
parents: 8
diff changeset
227
24
4c9dbfa30a66 Implemented audio
Michael Pavone <pavone@retrodev.com>
parents: 19
diff changeset
228 context.audio = alloc_audio(MASTER_CLOCK, 17, system_sample_rate(), system_buffer_size());
4c9dbfa30a66 Implemented audio
Michael Pavone <pavone@retrodev.com>
parents: 19
diff changeset
229
8
5176efdda5ae Initial work on VDP emulation
Michael Pavone <pavone@retrodev.com>
parents: 0
diff changeset
230 run_console(&context);
0
7e44f7d5810b Initial commit. CPU working well enough for simple hello world program.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
231 return 0;
7e44f7d5810b Initial commit. CPU working well enough for simple hello world program.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
232 }