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apu.py
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apu.py
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import pygame
import math
import numpy as np
import pygame.sndarray
class APU:
def __init__(self, cpu):
# I can't actually change the default samp rate
self.sample_rate = 22050
pygame.mixer.init(frequency = self.sample_rate, size = -16, channels = 2) # 22.05kHz, 16-bit signed, stereo
self.noise = Noise(self)
self.triangle = Triangle(self)
self.pulse1 = Pulse(self)
self.pulse2 = Pulse(self)
self.pulse = [self.pulse1, self.pulse2]
self.DMC = DMC(self)
self.DMC.interrupt = 0
self.frame_interrupt = 0
self.length_counter_status = 0
"""
self.noise.enable = 0
self.triangle.enable = 0
self.pulse1.enable = 0
self.pulse2.enable = 0
"""
self.fiveframe = 0
self.disable_frame_int = 1
self._clock = 0
self._fast_clock = 0
def read(self, reg): # 0x4015 only
ret = Byte(0)
ret[0] = self.pulse1.enable()
ret[1] = self.pulse2.enable()
ret[2] = self.triangle.enable()
ret[3] = self.noise.enable()
ret[4] = self.DMC.enable()
# ret[5] = 0
ret[6] = self.frame_interrupt
self.frame_interrupt = 0
ret[7] = self.DMC.interrupt
# print "irq reset"
return int(ret)
def write(self, reg, value):
value = Byte(value)
reg &= 0xFF
if reg < 8:
self.pulse[reg // 4].write(reg, value)
elif reg in [0x8, 0xA, 0xB]:
self.triangle.write(reg, value)
elif reg in [0xC, 0xE, 0xF]:
self.noise.write(reg, value)
elif reg in [0x10, 0x11, 0x12, 0x13]:
self.DMC.write(reg, value)
elif reg == 0x15:
self.DMC.enable(value[4])
self.noise.enable(value[3])
self.triangle.enable(value[2])
self.pulse2.enable(value[1])
self.pulse1.enable(value[0])
elif reg == 0x17:
self.fiveframe = value[7]
self.disable_frame_int = value[6]
if self.disable_frame_int:
self.frame_interrupt = 0
# print(value)
# print self.disable_frame_int, self.fiveframe
def clock(self, cycles):
self._fast_clock += 2*cycles
if self._fast_clock > 14915: # I think this needs changing
self._fast_clock -= 14915
# clock envelopes and triangle's linear counter
self.fast_clock()
self._clock += 1
self._clock %= 5 if self.fiveframe else 4
if self._clock < 4:
if self._clock % 2 == self.fiveframe:
# clock length counters and sweep units
self.slow_clock()
self.slow_clock()
if self._clock == 3 and not self.fiveframe and not self.disable_frame_int:
# print "irq set"
self.frame_interrupt = 1
def slow_clock(self):
# clock length counters and sweep units
# TODO: EVERYTHING
pass
def fast_clock(self):
# clock envelopes and triangle's linear counter
# TODO: EVERYTHING
pass
def play_floats(self, floatsound):
floatsound *= 2**15
s = np.int16(zip(floatsound, floatsound))
self.play(s)
def play(self, rawsound):
s = pygame.sndarray.make_sound(rawsound)
s.play(0)
def sinetest(self, freq, runtime):
raw = np.array([math.sin(x*2.0*math.pi*freq/self.sample_rate) for x in xrange(0, int(runtime*self.sample_rate))])
self.play_floats(raw)
def testtone(self):
self.sinetest(440.0, 0.1)
# raw_input()
class Byte():
def __init__(self, val):
self.val = val
def __getitem__(self, s):
if type(s) is slice:
ret = self.val
ret >>= s.start
ret &= 1<<(s.stop - s.start + 1) - 1
else:
ret = (self.val >> s) & 1
return ret
def __setitem__(self, s, value):
if type(s) is slice:
mask = (1<<(s.stop - s.start + 1) - 1) << s.start
newval = self.val & ~(mask)
newval += (value << s.start) & mask
else:
newval = self.val & ~(1<<s)
newval += (value << s) & (1<<s)
self.val = newval
def __str__(self):
return str(self.val)
def __int__(self):
return self.val
class Channel():
def __init__(self, apu):
self.apu = apu
self.enable(0)
self._enabled = 0
self.duty = 0
self.loop_envelope = 0
self.const_vol = 0
self.volume = 0
self.sweep = 0
self.sweep_en = 0
self.sweep_period = 0
self.sweep_negative = 0
self.sweep_shift = 0
self.sweep_start = 0
self.timer = 0
self.length_counter = 0
self.length_counter = 0
self.envelope_start = 0
self.envelope_counter = 0
self.envelope = 0
def enable(self, val = None):
if val is not None:
self._enabled = val
if not val:
self.length_counter = 0
else:
return self._enabled and self.length_counter > 0
def fast_clock(self):
# clock envelopes and triangle's linear counter
if self.length_counter and not self.loop_envelope:
self.length_counter -= 1
if self.envelope_start:
self.envelope_start = 0
self.envelope_counter = 15
if self.loop_envelope and not self.envelope_counter:
self.envelope_counter = 15
elif self.envelope_counter:
self.envelope_counter -= 1
def slow_clock(self):
# clock length counters and sweep units
# TODO: EVERYTHING
pass
def get_volume(self):
if self.const_vol:
return self.volume
else:
return self.envelope_counter
class Pulse(Channel):
def __init__(self, apu):
Channel.__init__(self, apu)
self.length_lookup = [0x0A,0xFE,0x14,0x02,0x28,0x04,0x50,0x06,0xA0,0x08,0x3C,0x0A,0x0E,0x0C,0x1A,0x0E,0x0C,0x10,0x18,0x12,0x30,0x14,0x60,0x16,0xC0,0x18,0x48,0x1A,0x10,0x1C,0x20,0x1E]
def write(self, reg, value):
reg %= 4
if not reg:
self.duty = value[6:7]
self.loop_envelope = value[5] # aka length counter halt
self.const_vol = value[4]
self.volume = value[0:3]
if reg == 1:
self.sweep_en = value[7]
self.sweep_period = value[4:6]
self.sweep_negative = value[3]
self.sweep_shift = value[0:2]
self.sweep_start = 1
if reg == 2:
self.timer &= 0x700
self.timer += value[0:7]
if reg == 3:
self.timer &= 0xFF
self.timer += value[0:2]
self.length_counter = self.length_lookup[value[3:7]]
self.envelope_start = 1
self.sequence = 0
class Noise(Channel):
def __init__(self, apu):
Channel.__init__(self, apu)
def write(self, reg, value):
pass
class Triangle(Channel):
def __init__(self, apu):
Channel.__init__(self, apu)
def write(self, reg, value):
pass
class DMC(Channel):
def __init__(self, apu):
Channel.__init__(self, apu)
self.interrupt = 0
def write(self, reg, value):
pass