788 lines
22 KiB
Python
788 lines
22 KiB
Python
#!/usr/bin/env python3
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import random
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import sys
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import pyglet
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# TODO: Don't hardcode keyboard input
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keypad_keys = [
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pyglet.window.key._1, pyglet.window.key._2, pyglet.window.key._3, pyglet.window.key._4,
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pyglet.window.key.Q, pyglet.window.key.W, pyglet.window.key.E, pyglet.window.key.R,
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pyglet.window.key.A, pyglet.window.key.S, pyglet.window.key.D, pyglet.window.key.F,
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pyglet.window.key.Z, pyglet.window.key.X, pyglet.window.key.C, pyglet.window.key.V,
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]
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keypad_keys = list(zip(keypad_keys, [
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pyglet.window.key.NUM_7, pyglet.window.key.NUM_8, pyglet.window.key.NUM_9, pyglet.window.key.NUM_SUBTRACT,
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pyglet.window.key.NUM_4, pyglet.window.key.NUM_5, pyglet.window.key.NUM_6, pyglet.window.key.NUM_ADD,
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pyglet.window.key.NUM_1, pyglet.window.key.NUM_2, pyglet.window.key.NUM_3, pyglet.window.key.NUM_ENTER,
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pyglet.window.key.NUM_DIVIDE, pyglet.window.key.NUM_0, pyglet.window.key.NUM_MULTIPLY, pyglet.window.key.NUM_SEPARATOR,
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]))
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# OSCOM Nano keys are arranged like
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# 123C
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# 456D
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# 789E
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# A0BF
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# according to http://hobbylabs.org/oscom_nano.htm
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# However, at the moment the indices of the keys are
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# 0123
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# 4567
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# 89ab
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# cdef
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# This rearranges them so that the index and the hex digit match
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keypad_keys = [keypad_keys[i] for i in [0xd, 0, 1, 2, 4, 5, 6, 8, 9, 0xa, 0xc, 0xe, 3, 7, 0xb, 0xf]]
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def key_pressed(symbol):
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global keys_pressed, keypress_arrived
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for i in range(16):
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if symbol in keypad_keys[i]:
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keys_pressed[i] = True
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keypress_arrived = True
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break
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def key_released(symbol):
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global keys_pressed
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for i in range(16):
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if symbol in keypad_keys[i]:
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keys_pressed[i] = False
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break
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def draw_screen():
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global display_screen
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to_draw = []
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for y in range(32):
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for x in range(64):
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if display_screen[y * 64 + x]:
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to_draw.append((x, y))
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screen_points = []
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for x, y in to_draw:
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# pyglet has 0,0 at bottom left, so reverse the y
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y = 31 - y
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# TODO: Don't hardcode pixel size
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# Lol, what is a winding order
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screen_points.append(x * 10)
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screen_points.append(y * 10)
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screen_points.append(x * 10 + 10)
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screen_points.append(y * 10)
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screen_points.append(x * 10 + 10)
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screen_points.append(y * 10 + 10)
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screen_points.append(x * 10)
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screen_points.append(y * 10 + 10)
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if len(screen_points) > 0:
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pyglet.graphics.draw(len(screen_points) // 2,
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pyglet.gl.GL_QUADS,
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('v2i', screen_points)
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)
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def step():
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global data_registers, ip, stack, i_register
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global ram, font_start
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global screen
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global delay_timer, sound_timer
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global keys_pressed, waiting_for_keypress, keypress_arrived
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# Keep track of whether we did a draw or a jump, for the draw
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# sprint feature
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did_draw = False
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did_jump = False
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# Don't execute any code in a waitstate, as it'd only end up
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# busylooping
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if waiting_for_keypress and not keypress_arrived: return did_draw, did_jump
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high_byte = ram[ip]
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ip = (ip + 1) & 0xfff
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low_byte = ram[ip]
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ip = (ip + 1) & 0xfff
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#print(hex(high_byte), hex(low_byte), hex(ip), [hex(i) for i in data_registers], [hex(i) for i in stack], hex(i_register), delay_timer)#debg
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#input()#debg
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# Instruction info gotten from http://mattmik.com/files/chip8/mastering/chip8.html
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# 00E0 clearscreen
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if high_byte == 0x00 and low_byte == 0xE0:
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screen = [False] * 64 * 32
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# 00EE ret
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elif high_byte == 0x00 and low_byte == 0xEE:
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ip = stack.pop()
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did_jump = True
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# 0nnn call_machine
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elif high_byte >> 4 == 0:
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# Our own non-standard debug
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if high_byte & 0xf == 0x1:
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print(low_byte & 0xf, data_registers[low_byte & 0xf])
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else:
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print("%03x: Can't call machine language!" % (ip - 2))
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sys.exit(1)
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# 1nnn jmp nnn
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elif high_byte >> 4 == 1:
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ip = ((high_byte & 0xf) << 8) | low_byte
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did_jump = True
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# 2nnn call nnn
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elif high_byte >> 4 == 2:
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stack.append(ip)
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ip = ((high_byte & 0xf) << 8) | low_byte
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did_jump = True
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# 3xnn skipeq vx, nn
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elif high_byte >> 4 == 3:
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if data_registers[high_byte & 0xf] == low_byte:
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ip = (ip + 2) & 0xfff
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# 4xnn skipneq vx, nn
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elif high_byte >> 4 == 4:
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if data_registers[high_byte & 0xf] != low_byte:
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ip = (ip + 2) & 0xfff
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# 5xy0 skipeq vx, vy
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elif high_byte >> 4 == 5 and low_byte & 0xf == 0:
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if data_registers[high_byte & 0xf] == data_registers[low_byte >> 4]:
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ip = (ip + 2) & 0xfff
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# 6xnn mov vx, nn
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elif high_byte >> 4 == 6:
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data_registers[high_byte & 0xf] = low_byte
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# 7xnn add vx, nn (no flags)
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elif high_byte >> 4 == 7:
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old_value = data_registers[high_byte & 0xf]
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data_registers[high_byte & 0xf] = (old_value + low_byte) & 0xff
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# 8xy0 mov vx, vy
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elif high_byte >> 4 == 8 and low_byte & 0xf == 0:
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data_registers[high_byte & 0xf] = data_registers[low_byte >> 4]
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# 8xy1 or vx, vy
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elif high_byte >> 4 == 8 and low_byte & 0xf == 1:
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old_value = data_registers[high_byte & 0xf]
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result = old_value | data_registers[low_byte >> 4]
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data_registers[high_byte & 0xf] = result
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# 8xy2 and vx, vy
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elif high_byte >> 4 == 8 and low_byte & 0xf == 2:
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old_value = data_registers[high_byte & 0xf]
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result = old_value & data_registers[low_byte >> 4]
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data_registers[high_byte & 0xf] = result
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# 8xy3 xor vx, vy
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elif high_byte >> 4 == 8 and low_byte & 0xf == 3:
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old_value = data_registers[high_byte & 0xf]
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result = old_value ^ data_registers[low_byte >> 4]
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data_registers[high_byte & 0xf] = result
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# 8xy4 add vx, vy (carry flag)
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elif high_byte >> 4 == 8 and low_byte & 0xf == 4:
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old_value = data_registers[high_byte & 0xf]
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result = old_value + data_registers[low_byte >> 4]
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data_registers[high_byte & 0xf] = result & 0xff
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if result > 255:
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data_registers[0xf] = 1
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else:
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data_registers[0xf] = 0
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# 8xy5 sub vx, vy (carry flag)
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elif high_byte >> 4 == 8 and low_byte & 0xf == 5:
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old_value = data_registers[high_byte & 0xf]
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result = old_value - data_registers[low_byte >> 4]
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data_registers[high_byte & 0xf] = result & 0xff
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if result < 0:
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data_registers[0xf] = 0
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else:
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data_registers[0xf] = 1
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# 8xy6 shr vx, vy, 1 (LSB to VF)
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elif high_byte >> 4 == 8 and low_byte & 0xf == 6:
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other_value = data_registers[low_byte >> 4]
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data_registers[high_byte & 0xf] = other_value >> 1
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data_registers[0xf] = other_value & 0x1
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# 8xy7 sub vx, vy, vx (carry flag)
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elif high_byte >> 4 == 8 and low_byte & 0xf == 7:
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old_value = data_registers[high_byte & 0xf]
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result = data_registers[low_byte >> 4] - old_value
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data_registers[high_byte & 0xf] = result & 0xff
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if result < 0:
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data_registers[0xf] = 0
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else:
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data_registers[0xf] = 1
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# 8xyE shl vx, vy, 1 (MSB to VF)
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elif high_byte >> 4 == 8 and low_byte & 0xf == 0xE:
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other_value = data_registers[low_byte >> 4]
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data_registers[high_byte & 0xf] = (other_value << 1) & 0xff
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data_registers[0xf] = other_value >> 7
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# 9xy0 skipneq vx, vy
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elif high_byte >> 4 == 9 and low_byte & 0xf == 0:
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if data_registers[high_byte & 0xf] != data_registers[low_byte >> 4]:
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ip = (ip + 2) & 0xfff
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# Annn mov i, nnn
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elif high_byte >> 4 == 0xA:
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i_register = ((high_byte & 0xf) << 8) | low_byte
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# Bnnn jmp nnn + v0
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elif high_byte >> 4 == 0xB:
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ip = ((high_byte & 0xf) << 8) | low_byte
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ip = (ip + data_registers[0]) & 0xfff
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did_jump = True
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# Cxnn maskedrandom vx, nn
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elif high_byte >> 4 == 0xC:
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result = random.randint(0, 255)
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data_registers[high_byte & 0xf] = result & low_byte
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# Dxyn draw vx, vy, n
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elif high_byte >> 4 == 0xD:
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# OSCOM Nano manual (page 38) says "<The screen behaves as
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# if the top was connected to the bottom and the sides to
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# each other>", but I can't find any info on how to do this
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# wrapping on the generally used sources.
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#
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# https://github.com/AfBu/haxe-chip-8-emulator looks like
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# it wraps the pixels to the next row down, but as it
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# doesn't seem to handle drawing out the bottom of the
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# screen at all, unsure how intentional this is.
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#
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# https://github.com/dmatlack/chip8 wraps the pixels on the
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# other side of the same line.
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#
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# The game "Blitz" seems to require draws off the bottom of
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# the screen to not result in anything. Therefore, as I
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# have yet to find any games that break with it, I'm just
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# skipping pixels that fall outside the screen.
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did_draw = True
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x_start = data_registers[high_byte & 0xf]
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y_start = data_registers[low_byte >> 4]
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any_unset = False
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# Sprite will be 8 pixels wide and n tall
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for dy in range(low_byte & 0xf):
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# Load this line's graphics
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line = ram[(i_register + dy) & 0xfff]
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y = y_start + dy
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# Screen is 32 lines tall
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if y >= 32:
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continue
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for dx in range(8):
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x = x_start + dx
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# Screen is 64 columns wide
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if x >= 64:
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continue
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# Pixels are stored MSB-left
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pixel = (line >> (7 - dx)) & 1
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screen_index = y * 64 + x
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if pixel:
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# Check if we are unsetting a pixel
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if screen[screen_index]:
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any_unset = True
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# XOR the pixel
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screen[screen_index] = not screen[screen_index]
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if any_unset:
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data_registers[0xf] = 1
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else:
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data_registers[0xf] = 0
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# Ex9E skipkey vx
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elif high_byte >> 4 == 0xE and low_byte == 0x9E:
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if keys_pressed[data_registers[high_byte & 0xf]]:
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ip = (ip + 2) & 0xfff
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# ExA1 skipnkey vx
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elif high_byte >> 4 == 0xE and low_byte == 0xA1:
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if not keys_pressed[data_registers[high_byte & 0xf]]:
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ip = (ip + 2) & 0xfff
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# Fx07 getdelay vx
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elif high_byte >> 4 == 0xF and low_byte == 0x07:
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data_registers[high_byte & 0xf] = delay_timer
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# Fx0A getkey vx
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elif high_byte >> 4 == 0xF and low_byte == 0x0A:
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if not waiting_for_keypress:
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# Wait for a key to be pressed and then re-execute
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# this instruction
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waiting_for_keypress = True
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keypress_arrived = False
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ip = (ip - 2) & 0xfff
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if keypress_arrived:
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# A key was pressed
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for i in range(16):
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if keys_pressed[i]:
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# Set vx to first key we found
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any_pressed = True
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data_registers[high_byte & 0xf] = i
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break
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waiting_for_keypress = False
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# Fx15 setdelay vx
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elif high_byte >> 4 == 0xF and low_byte == 0x15:
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delay_timer = data_registers[high_byte & 0xf]
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# Fx18 setsound vx
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elif high_byte >> 4 == 0xF and low_byte == 0x18:
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sound_timer = data_registers[high_byte & 0xf]
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# Fx1E add i, vx
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elif high_byte >> 4 == 0xF and low_byte == 0x1E:
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i_register = (i_register + data_registers[high_byte & 0xf]) & 0xfff
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# Fx29 mov i, digit(vx)
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elif high_byte >> 4 == 0xF and low_byte == 0x29:
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value = data_registers[high_byte & 0xf]
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if 0 <= value <= 0xf:
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# Each digit is 5 lines tall = 5 bytes long
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i_register = font_start + value * 5
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else:
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print('%03x: Bad font character' % (ip-2))
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sys.exit(1)
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# Fx33 mov [i … i+2], bcd(vx)
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elif high_byte >> 4 == 0xF and low_byte == 0x33:
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value = data_registers[high_byte & 0xf]
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highdigit = value // 100
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middigit = value // 10 % 10
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lowdigit = value % 10
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ram[i_register] = highdigit
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ram[(i_register + 1) & 0xfff] = middigit
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ram[(i_register + 2) & 0xfff] = lowdigit
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# Fx55 mov [i … i+x], v0 … vx (updates i)
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elif high_byte >> 4 == 0xF and low_byte == 0x55:
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for register in range((high_byte & 0xf) + 1):
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ram[i_register] = data_registers[register]
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i_register = (i_register + 1) & 0xfff
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# Fx65 mov v0 … vx, [i … i+x] (updates i)
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elif high_byte >> 4 == 0xF and low_byte == 0x65:
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for register in range((high_byte & 0xf) + 1):
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data_registers[register] = ram[i_register]
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i_register = (i_register + 1) & 0xfff
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# Fallback
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else:
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print('%03x: Unrecognized!' % (ip-2))
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return did_draw, did_jump
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def tick_timers():
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global delay_timer, sound_timer
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# Tick the delay timer down until it reaches 0
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if delay_timer > 0:
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# The timer should tick down at 60Hz
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delay_timer -= 1
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# Play a sound using pyglet if we have a non-zero sound timer
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# It will run asynchronously from the other parts, which means it
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# won't experience slowdown similarily to the delay timer
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# Unsure if this is good or bad
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if sound_timer > 0:
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# sound_timer is in the unit of 1/60th of a second, while
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# Square takes length in seconds
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pyglet.media.synthesis.Square(sound_timer/60).play()
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sound_timer = 0
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def advance_interpreter(dt):
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global cpu_clock
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global screen, display_screen, screen_fps
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global cpu_cycles_to_go, frames_to_go
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# Each tic (60Hz) we need to run cpu_clock / 60Hz cycles and
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# draw screen_fps / 60 frames
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cpu_cycles_to_go += cpu_clock / 60
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frames_to_go += screen_fps / 60
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tick_timers()
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while cpu_cycles_to_go >= 1:
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did_draw, _ = step()
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cpu_cycles_to_go -= 1
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# If we did a draw, run upto two ticks' cycles to reach
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# the next draw. Chip-8 draws are often paired, an erase
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# and a draw. If we don't hit both in the same frame, it
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# will cause flicker.
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# Since this will put the number of cycles to go below zero
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# if we run out of our own cycles, on average we will run
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# the right number of cycles per tick
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# Also, to avoid pairing draw half of one pair and erase
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# half of another, the sprint is invalidated by a jump, a
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# call or a ret
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if did_draw:
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#sprint_run_out = True#debg
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for cycle in range(2*cpu_clock // 60):
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did_draw, did_jump = step()
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cpu_cycles_to_go -= 1
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# Exit as soon as we hit the other draw
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if did_draw:
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#sprint_run_out = False#debg
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#print('Sprint succeeded! %i' % cycle)#debg
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break
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if did_jump:
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#sprint_run_out = False#debg
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#print('Sprint failed! (jump) %i' % cycle)#debg
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break
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#if sprint_run_out: print('Sprint failed! (ran out)')#debg
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if frames_to_go >= 1:
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# Only draw the latest frame. This means FPS >60 won't work
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# but why would you ever want to run chip-8 faster than
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# that
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display_screen = screen[:]
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frames_to_go -= int(frames_to_go)
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def initialize_ram():
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global ram, font_start
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ram = [0]*(1<<12)
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# Font data is from http://mattmik.com/files/chip8/mastering/chip8.html
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# and http://devernay.free.fr/hacks/chip8/C8TECH10.HTM#2.4
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font = [
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0xf0, 0x90, 0x90, 0x90, 0xf0, # 0
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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
|
|
]
|
|
# Unsure where the font should go. Both http://www.multigesture.net/articles/how-to-write-an-emulator-chip-8-interpreter/
|
|
# and http://stevelosh.com/blog/2016/12/chip8-graphics/?m=1#fonts
|
|
# say it goes at 0x50, but most resources don't have its location
|
|
# specified and I have run into implementations that have it at
|
|
# start of memory (http://craigthomas.ca/blog/2017/10/15/writing-a-chip-8-emulator-built-in-font-set-part-4/)
|
|
# and even a resource stating it's at high memory (http://www.multigesture.net/wp-content/uploads/mirror/goldroad/chip8.shtml)
|
|
# The location honestly shouldn't matter, but I'm putting it at
|
|
# 0x50
|
|
font_start = 0x50
|
|
ram[font_start:font_start + len(font)] = font
|
|
|
|
test_program = [
|
|
## Arithmetic test
|
|
#0x65, 0x42, # 0x42 → v5 | v5: 42
|
|
#0x82, 0x50, # v5 → v2 | v2: 42, v5: 42
|
|
#0x72, 0x69, # v2 + 0x69 → v2 | v2: ab, v5: 42
|
|
#0x85, 0x24, # v5 + v2 → v5 | v2: ab, v5: ed, vf: 00
|
|
#0x85, 0x24, # v5 + v2 → v5 | v2: ab, v5: 98, vf: 01
|
|
|
|
#0x85, 0x25, # v5 - v2 → v5 | v2: ab, v5: ed, vf: 00
|
|
#0x82, 0x57, # v5 - v2 → v2 | v2: 42, v5: ed, vf: 01
|
|
|
|
#0x63, 0x01, # 0x01 → v3 | v2: 42, v3: 01, v5: ed, vf: 01
|
|
#0x85, 0x22, # v5 & v2 → v5 | v2: 42, v3: 01, v5: 40, vf: 01
|
|
#0x83, 0x51, # v3 | v5 → v3 | v2: 42, v3: 41, v5: 40, vf: 01
|
|
#0x82, 0x33, # v2 ^ v3 → v2 | v2: 3, v3: 41, v5: 40, vf: 01
|
|
|
|
#0x82, 0x56, # v5 >> 1 → v2 | v2: 20, v3: 41, v5: 40, vf: 00
|
|
#0x85, 0x36, # v3 >> 1 → v5 | v2: 20, v3: 41, v5: 20, vf: 01
|
|
|
|
#0x64, 0x70, # 0x70 → v4 | v2: 20, v3: 41, v4: 70, v5: 20, vf: 01
|
|
#0x84, 0x4E, # v4 << 1 → v4 | v2: 20, v3: 41, v4: e0, v5: 20, vf: 00
|
|
#0x84, 0x4E, # v4 << 1 → v4 | v2: 20, v3: 41, v4: c0, v5: 20, vf: 01
|
|
|
|
## RNG test
|
|
#0xC0, 0xff, # RNG → v0
|
|
#0xC0, 0xff, # RNG → v0
|
|
#0xC0, 0xff, # RNG → v0
|
|
#0xC0, 0xff, # RNG → v0
|
|
#0xC0, 0x06, # RNG & 0x00001110 → v0
|
|
#0xC0, 0x06, # RNG & 0x00001110 → v0
|
|
#0xC0, 0x06, # RNG & 0x00001110 → v0
|
|
#0xC0, 0x06, # RNG & 0x00001110 → v0
|
|
|
|
## Flow control test
|
|
#0x60, 0x00, # mov v0, 0
|
|
#0x22, 0x06, # call 0x206
|
|
#0x12, 0x02, # jmp 0x202
|
|
#0x70, 0x01, # add v0, 1
|
|
#0x00, 0xee, # ret
|
|
|
|
## Skip test
|
|
#0x61, 0xf0, # mov v1, 0xf0
|
|
#0x62, 0xf1, # mov v2, 0xf1
|
|
#0x83, 0x10, # mov v3, v1
|
|
#0x31, 0xf0, # skipeq v3, 0xf0
|
|
#0x00, 0x00, # ill
|
|
#0x31, 0x00, # skipeq v3, 0
|
|
#0x6e, 0x01, # mov ve, 1
|
|
#0x51, 0x30, # skipeq v1, v3
|
|
#0x00, 0x00, # ill
|
|
#0x42, 0xf0, # skipneq v2, 0xf0
|
|
#0x00, 0x00, # ill
|
|
#0x91, 0x20, # skipneq v1, v2
|
|
#0x00, 0x00, # ill
|
|
#0x6d, 0x01, # mov vd, 1
|
|
|
|
## Timer test
|
|
#0xF0, 0x07, # getdelay v0
|
|
#0x40, 0x00, # skipneq v0, 0
|
|
#0x22, 0x08, # call 0x208
|
|
#0x12, 0x00, # jmp 0x200
|
|
#0x60, 0xff, # mov v0, 0xff
|
|
#0xf0, 0x15, # setdelay v0
|
|
#0x00, 0xee, # ret
|
|
|
|
## Input wait test
|
|
#0xf1, 0x0a, # getkey v1
|
|
|
|
## Input skip test
|
|
#0x61, 0x00, # mov v1, 0
|
|
#0x62, 0x0a, # mov v2, 0xa
|
|
#0x63, 0x0b, # mov v3, 0xb
|
|
#0xe2, 0xa1, # skipnkey v2
|
|
#0x71, 0x01, # add v1, 1
|
|
#0xe3, 0x9e, # skipkey v3
|
|
#0x12, 0x06, # jmp 0x206
|
|
|
|
## Input wait test the second
|
|
#0xa1, 0x23, # mov i, 0x123
|
|
#0xf0, 0x0a, # getkey v0
|
|
#0xf0, 0x1e, # add i, v0
|
|
#0x12, 0x02, # jmp 0x202
|
|
|
|
## Drawing program / drawing test
|
|
## From the OSCOM Nano manual
|
|
#0x6a, 0x01, # mov va, 1
|
|
#0x60, 0x10, # mov v0, 0x10
|
|
#0x61, 0x20, # mov v1, 0x20
|
|
#0xa2, 0x50, # mov i, 0x250
|
|
|
|
#0xf2, 0x0a, # getkey v2
|
|
|
|
#0x42, 0x01, # skipneq v2, 1
|
|
#0x22, 0x2e, # call 0x22e
|
|
|
|
#0x42, 0x02, # skipneq v2, 2
|
|
#0x80, 0xa5, # sub v0, va
|
|
|
|
#0x42, 0x03, # skipneq v2, 3
|
|
#0x22, 0x34, # call 0x234
|
|
|
|
#0x42, 0x04, # skipneq v2, 4
|
|
#0x81, 0xa5, # sub v1, va
|
|
|
|
#0x42, 0x06, # skipneq v2, 6
|
|
#0x81, 0xa4, # add v1, va
|
|
|
|
#0x42, 0x07, # skipneq v2, 7
|
|
#0x22, 0x3a, # call 0x23a
|
|
|
|
#0x42, 0x08, # skipneq v2, 8
|
|
#0x80, 0xa4, # add v0, va
|
|
|
|
#0x42, 0x09, # skipneq v2, 9
|
|
#0x22, 0x40, # call 0x240
|
|
|
|
#0xD1, 0x01, # draw v0, v1, 1
|
|
|
|
#0x12, 0x08, # jmp 0x208
|
|
|
|
## 22e
|
|
#0x81, 0xa5, # sub v1, va
|
|
#0x80, 0xa5, # sub v0, va
|
|
#0x00, 0xee, # ret
|
|
|
|
## 234
|
|
#0x80, 0xa5, # sub v0, va
|
|
#0x81, 0xa4, # add v1, va
|
|
#0x00, 0xee, # ret
|
|
|
|
## 23a
|
|
#0x80, 0xa4, # add v0, va
|
|
#0x81, 0xa5, # sub v1, va
|
|
#0x00, 0xee, # ret
|
|
|
|
## 240
|
|
#0x80, 0xa4, # add v0, va
|
|
#0x81, 0xa4, # add v1, va
|
|
#0x00, 0xee, # ret
|
|
|
|
## This was missing from the original
|
|
## Actually, never mind, it was just separately
|
|
## 246
|
|
#0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
|
## 250
|
|
#0x80,
|
|
|
|
## Font test
|
|
#0x60, 0x0a, # mov v0, 0x0a
|
|
#0xf1, 0x0a, # getkey v1
|
|
#0x00, 0xe0, # clearscreen
|
|
#0xf1, 0x29, # mov i, digit(v1)
|
|
#0xd0, 0x05, # draw v0, v0, 5
|
|
#0x12, 0x02, # jmp 0x202
|
|
|
|
## Base converter
|
|
## From the OSCOM Nano manual
|
|
## Modified to run several times and display input
|
|
#0x6a, 0x00, # mov va, 0
|
|
#0x6b, 0x00, # mov vb, 0
|
|
|
|
#0xf0, 0x0a, # getkey v0
|
|
#0x82, 0x00, # mov v2, v0
|
|
#0x00, 0xe0, # clearscreen
|
|
#0xf0, 0x29, # mov i, digit(v0)
|
|
#0xda, 0xb5, # draw va, vb, 5
|
|
#0x7a, 0x06, # add va, 6
|
|
|
|
#0xf1, 0x0a, # getkey v1
|
|
#0xf1, 0x29, # mov i, digit(v1)
|
|
#0xda, 0xb5, # draw va, vb, 5
|
|
#0x7b, 0x07, # add vb, 7
|
|
#0x6a, 0x00, # mov va, 0
|
|
|
|
#0x63, 0x00, # mov v3, 0
|
|
## 21c
|
|
#0x80, 0x24, # add v0, v2
|
|
#0x73, 0x01, # add v3, 1
|
|
#0x33, 0x0f, # skipeq v3, 0xf
|
|
#0x12, 0x1c, # jmp 0x21c
|
|
#0x80, 0x14, # add v0, v1
|
|
|
|
#0xA2, 0x50, # mov i, 0x250
|
|
#0xf0, 0x33, # mov [i … i+2], bcd(v0)
|
|
#0xf2, 0x65, # mov v0 … v2, [i … i+2]
|
|
|
|
#0xf0, 0x29, # mov i, digit(v0)
|
|
#0xda, 0xb5, # draw va, vb, 5
|
|
#0x7a, 0x06, # add va, 6
|
|
#0xf1, 0x29, # mov i, digit(v1)
|
|
#0xda, 0xb5, # draw va, vb, 5
|
|
#0x7a, 0x06, # add va, 6
|
|
#0xf2, 0x29, # mov i, digit(v2)
|
|
#0xda, 0xb5, # draw va, vb, 5
|
|
#0x12, 0x00, # jmp 0x200
|
|
|
|
]
|
|
#ram[0x200:len(test_program) + 0x200] = test_program
|
|
|
|
def initialize_screen():
|
|
global screen, display_screen, screen_fps
|
|
screen = [False] * 64 * 32
|
|
display_screen = screen[:]
|
|
# TODO: Support changing FPS
|
|
screen_fps = 60
|
|
|
|
def initialize_timers():
|
|
global delay_timer, sound_timer
|
|
delay_timer = 0
|
|
sound_timer = 0
|
|
|
|
def initialize_keyboard():
|
|
global keys_pressed, waiting_for_keypress, keypress_arrived
|
|
keys_pressed = [False]*16
|
|
waiting_for_keypress = False
|
|
keypress_arrived = False
|
|
|
|
def initialize_cpu(clockspeed):
|
|
global cpu_clock, data_registers, ip, stack, i_register
|
|
data_registers = [0] * 16
|
|
|
|
# According to the OSCOM Nano manual the program is loaded here
|
|
ip = 0x200
|
|
|
|
# It doesn't seem to be specified where this is stored, so put it
|
|
# in its own "address space"
|
|
stack = []
|
|
|
|
i_register = 0
|
|
|
|
cpu_clock = clockspeed
|
|
|
|
def load_program(f):
|
|
global ram
|
|
# ram is an array of numbers, not a bytestring
|
|
program = [i for i in f.read()]
|
|
# Load at 0x200
|
|
ram[0x200: 0x200 + len(program)] = program
|
|
|
|
def main():
|
|
global window
|
|
global cpu_cycles_to_go, frames_to_go
|
|
|
|
if len(sys.argv) == 2:
|
|
program_path = sys.argv[1]
|
|
# Run the interpreter at 500Hz by default
|
|
# This was picked from https://github.com/AfBu/haxe-CHIP-8-emulator/wiki/(Super)CHIP-8-Secrets
|
|
cpu_clock = 500
|
|
elif len(sys.argv) == 3:
|
|
program_path = sys.argv[1]
|
|
cpu_clock = int(sys.argv[2])
|
|
else:
|
|
print(f'Usage: {sys.argv[0]} program [cpu-speed]', file=sys.stderr)
|
|
sys.exit(1)
|
|
|
|
# TODO: Don't hardcode the size
|
|
window = pyglet.window.Window(640, 320, resizable = True)
|
|
|
|
# Don't use pulse driver, as it is really buggy and can crash the
|
|
# python process
|
|
pyglet.options['audio'] = ('openal', 'directsound', 'silent')
|
|
|
|
# Hook up our screen drawing routine
|
|
@window.event
|
|
def on_draw():
|
|
# Clear the screen
|
|
window.clear()
|
|
# Draw things
|
|
draw_screen()
|
|
|
|
# Handle keyboard input
|
|
@window.event
|
|
def on_key_press(symbol, modifiers):
|
|
key_pressed(symbol)
|
|
@window.event
|
|
def on_key_release(symbol, modifiers):
|
|
key_released(symbol)
|
|
|
|
initialize_ram()
|
|
initialize_screen()
|
|
initialize_timers()
|
|
initialize_keyboard()
|
|
initialize_cpu(cpu_clock)
|
|
|
|
# TODO: Deal with missing file gracefully
|
|
with open(program_path, 'rb') as f:
|
|
load_program(f)
|
|
|
|
cpu_cycles_to_go = 0
|
|
frames_to_go = 0
|
|
# Start the emulation
|
|
pyglet.clock.schedule_interval(advance_interpreter, 1/60)
|
|
|
|
pyglet.app.run()
|
|
|
|
if __name__ == '__main__':
|
|
main()
|