Feature: Added basic rom loading

5 files changed, 86 insertions, 3 deletions

diff --git a/config.h b/config.h
new file mode 100644
index 0000000..c70f65b
--- /dev/null
+++ b/config.h
@@ -0,0 +1,6 @@
+#ifndef _CONFIG_H_
+#define _CONFIG_H_
+
+#define INSTRUCTIONS_PER_SECOND 700
+
+#endif
diff --git a/emulator.c b/emulator.c
index e69de29..afc78b1 100644
--- a/emulator.c
+++ b/emulator.c
@@ -0,0 +1,29 @@
+#include <emulator.h>
+
+int emulator_load_rom(Emulator* emulator, char* rom_name)
+{
+    printf("load rom!: %s\n", rom_name);
+    FILE* rom = fopen(rom_name, "r");
+    if(rom == NULL)
+    {
+        perror("no rom file!\n");
+        return 1;
+    }
+
+    struct stat st;
+    fstat(fileno(rom), &st);
+
+    int bytes_read = fread(emulator->memory, 1, st.st_size, rom);
+    if(bytes_read != st.st_size)
+    {
+        perror("doesnt cuadrar\n");
+        return 2;
+    }
+
+    return 0;
+}
+
+int emulator_tick(Emulator* emulator)
+{
+    return 0;
+}
diff --git a/emulator.h b/emulator.h
index e69de29..edffa47 100644
--- a/emulator.h
+++ b/emulator.h
@@ -0,0 +1,17 @@
+#ifndef _EMULATOR_H_
+#define _EMULATOR_H_
+
+#include <stdio.h>
+#include  <sys/stat.h>
+
+typedef struct
+{
+    uint8_t is_on;
+    uint16_t pc;
+    uint8_t memory[4096];
+} Emulator;
+
+int emulator_load_rom(Emulator* emulator, char* rom_name);
+int emulator_tick(Emulator* emulator);
+
+#endif
diff --git a/main.c b/main.c
index 8f61750..114126f 100644
--- a/main.c
+++ b/main.c
@@ -1,12 +1,43 @@
 #include <stdio.h>
-#include "emulator.h"
+#include <unistd.h>
+#include <config.h>
+#include <emulator.h>
+
+int main(int argc, char** argv);
+void show_help();
 
 int main(int argc, char** argv)
 {
-    (void) argc;
-    (void) argv;
+    if(argc < 2)
+    {
+        show_help();
+        return 1;
+    }
+
+    Emulator emulator;
+
+    if(emulator_load_rom(&emulator, argv[1]) != 0)
+        return 2;
 
     printf("Hello brother!\n");
 
+    /*for(int i = 0; i < 4096; ++i)
+    {
+        printf("%c ", emulator.memory[i]);
+    }
+
+    putchar('\n');*/
+
+    while(emulator.is_on)
+    {
+        emulator_tick(&emulator);
+        usleep(1000000 / INSTRUCTIONS_PER_SECOND);
+    }
+
     return 0;
 }
+
+void show_help()
+{
+    printf("BAD USAGE! -> ./chip8_emulator [ROM]\n");
+}
diff --git a/roms/stars.ch8 b/roms/stars.ch8
new file mode 100644
index 0000000..712e83c
--- /dev/null
+++ b/roms/stars.ch8
Binary files differ