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#include <emulator.h>
int emulator_initialise(Emulator* emulator)
{
const uint8_t font[] =
{
0xF0, 0x90, 0x90, 0x90, 0xF0, // 0
0x20, 0x60, 0x20, 0x20, 0x70, // 1
0xF0, 0x10, 0xF0, 0x80, 0xF0, // 2
0xF0, 0x10, 0xF0, 0x10, 0xF0, // 3
0x90, 0x90, 0xF0, 0x10, 0x10, // 4
0xF0, 0x80, 0xF0, 0x10, 0xF0, // 5
0xF0, 0x80, 0xF0, 0x90, 0xF0, // 6
0xF0, 0x10, 0x20, 0x40, 0x40, // 7
0xF0, 0x90, 0xF0, 0x90, 0xF0, // 8
0xF0, 0x90, 0xF0, 0x10, 0xF0, // 9
0xF0, 0x90, 0xF0, 0x90, 0x90, // A
0xE0, 0x90, 0xE0, 0x90, 0xE0, // B
0xF0, 0x80, 0x80, 0x80, 0xF0, // C
0xE0, 0x90, 0x90, 0x90, 0xE0, // D
0xF0, 0x80, 0xF0, 0x80, 0xF0, // E
0xF0, 0x80, 0xF0, 0x80, 0x80 // F
};
//zero out the memory
memset(emulator, 0, sizeof(Emulator));
memcpy(emulator->memory + FONT_LOAD_LOCATION, font, sizeof(font));
emulator->is_on = 1;
return 0;
}
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);
//rom loaded after 0x200 into memory
int bytes_read = fread(emulator->memory + GAME_LOAD_LOCATION, 1, st.st_size, rom);
if(bytes_read != st.st_size)
{
perror("doesnt cuadrar\n");
return 2;
}
emulator->pc = GAME_LOAD_LOCATION;
return 0;
}
int emulator_tick(Emulator* emulator)
{
return 0;
}
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