make lib

Makefile

@@ -1,4 +1,7 @@
 
 
+chip: chip.c
+	gcc -O2 main.c chip.c -Wall -Wextra -Werror -o chip
+
 test: chip.c
-	gcc -O0 -g chip.c -fsanitize=address -fsanitize=undefined -Wall -Wextra -o test
+	gcc -DDEBUG -O0 -g main.c chip.c -fsanitize=address -fsanitize=undefined -Wall -Wextra -o test

chip.h

@@ -0,0 +1,78 @@
+
+#pragma once
+#include <stdint.h>
+#include <stdlib.h>
+
+void hexdump(const void *d, size_t datalen);
+
+#define DISPLAY_WIDTH_BYTES 8
+#define DISPLAY_WIDTH_BITS 64
+
+#define DISPLAY_HEIGHT_BYTES 4
+#define DISPLAY_HEIGHT_BITS 32
+
+struct display {
+  uint8_t *buffer;
+  uint8_t width;
+  uint8_t height;
+  int buffser_size;
+};
+
+struct emu_value {
+  uint8_t pad[0x27];
+  uint16_t program_counter;
+  uint16_t pointer_register;
+  uint8_t registers[16];
+  uint8_t extended_display_mode;
+  uint8_t delay_timer;
+  uint8_t sound_timer;
+  uint8_t font[80];
+  uint16_t stack[160];
+  uint8_t stack_top;
+  uint8_t unused;
+};
+
+typedef union {
+  uint8_t all_memory[0x1000];
+  struct {
+    union {
+      struct emu_value values;
+      uint8_t reserved_memory[0x200];
+    };
+    uint8_t main_memory[0xE00];
+  };
+} chip_memory;
+
+typedef struct {
+  chip_memory memory;
+  struct display display;
+  struct emu_value *value;
+  uint8_t display_pad1[4];
+  uint8_t display_buffer[(2 * DISPLAY_WIDTH_BYTES)     // max columns
+                         * (2 * DISPLAY_HEIGHT_BITS)]; // max rows
+  uint8_t display_pad2[4];
+  // struct emu_value reserved;
+} emu_state;
+
+void initialize(emu_state *state);
+void print_display(struct display *display);
+
+void loop(emu_state *state);
+
+extern int chip_errored;
+
+#define info(str)                                                              \
+  do {                                                                         \
+    printf("INFO %s:%d  %s\n", __FILE__, __LINE__, str);                       \
+  } while (0)
+
+#define warn(str)                                                              \
+  do {                                                                         \
+    printf("WARN %s:%d  %s\n", __FILE__, __LINE__, str);                       \
+  } while (0)
+
+#define error(str)                                                             \
+  do {                                                                         \
+    printf("ERRO %s:%d  %s\n", __FILE__, __LINE__, str);                       \
+    chip_errored = 1;                                                          \
+  } while (0)

main.c

@@ -0,0 +1,42 @@
+
+#include "chip.h"
+
+#include <stdio.h>
+#include <unistd.h>
+
+int main(int argc, char **argv) {
+
+  emu_state state = {};
+
+  if (argc < 2) {
+    printf("No program given.\n");
+    return 1;
+  }
+
+  initialize(&state);
+  FILE *f = fopen(argv[1], "r");
+  size_t err = 0;
+  size_t bytes = 0;
+
+  do {
+    err = fread(state.memory.main_memory, sizeof(char),
+                sizeof(state.memory.main_memory), f);
+    bytes += err;
+  } while (err > 0);
+  fclose(f);
+  printf("Read bytes %ld\n", bytes);
+
+  info("Read program in");
+  hexdump(state.memory.all_memory, sizeof(state.memory.all_memory));
+
+  print_display(&state.display);
+  info("Starting.");
+
+  while (!chip_errored) {
+    loop(&state);
+    usleep(3000);
+  }
+
+  // hexdump(state.memory.all_memory, sizeof(state.memory.all_memory));
+  print_display(&state.display);
+}