def __init__(self):
# program counter
self.pc = 0
# register used to store memory address, 16-bit
self.I = None
# Initialize the Arithmetic logic unit
self.opcode_executor = OpcodeExecutor(self)
# 8-bit storage
self.sound_timer = None
self.is_running = False
# 8-bit storage
self.delay_timer = None
# 8-bit storage
self.stack_pointer = None
# set of hex characters for representing
# some characters
self.hex_chars = [
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
]
class Chip8(object):
def __init__(self):
# program counter
self.pc = 0
# register used to store memory address, 16-bit
self.I = None
# Initialize the Arithmetic logic unit
self.opcode_executor = OpcodeExecutor(self)
# 8-bit storage
self.sound_timer = None
self.is_running = False
# 8-bit storage
self.delay_timer = None
# 8-bit storage
self.stack_pointer = None
# set of hex characters for representing
# some characters
self.hex_chars = [
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
]
def initialize(self):
self.pc = 0x200
self.step = 0
self.I = 0
self.keys = []
self.sound_timer = 0
self.memory = []
self.delay_timer = 0
self.stack_pointer = 0
self.display_width = 64
self.display_height = 32
self.draw_flag = False
self.display = []
# registers 8-bit
self.Vx = []
# 16-bit long stack
self.stack = []
for i, chars in enumerate(self.hexChars):
self.memory[i] = chars
def load_program(self, program):
"""
Load the program into memory
"""
for i, chars in enumerate(program):
self.memory[0x200 + i] = chars
def clear_screen(self):
"""
clear the display
"""
self.renderer.clear_display()
for i, j in enumerate(self.display):
self.display[i] = 0
def set_display(self, dx, dy):
"""
Handle the logic for setting the display
"""
if dx > self.display_width:
dx -= self.display_width
elif dx < 0:
dx += self.display_width
if dx > self.display_height:
dx -= self.display_width
elif dx < 0:
dx += self.display_height
self.display[dx + (dy * self.display_width)] ^= 1
def key_pressed(self, key):
self.keys[key] = True
def key_realeased(self, key):
self.keys[key] = False
def continue_cycle(self, key):
"""
Continue cycle after pause
"""
self.Vx[self.x] = key
self.emulate_cpu()
def stop_cycle(self):
self.is_running = False
def start_cycle(self):
"""
Start the cpu execution cycle, this is the point where
the opcodes are analyzed
"""
opcode = self.memory[self.pc] << 8 | self.memory[self.pc + 1]
self.x = (opcode & 0x0f00) >> 8
self.y = (opcode & 0x00f0) >> 4
self.pc += 2
self.opcode_executor.execute(opcode, self.x, self.y)
