def handle_read(self, dgram_spec=AVR_Datagram.AVR_PC_Status):
"""Attempt to read a datagram from the serial port.
Look for a bytes matching AVR_Datagram.expect_dgram_start(),
and read additional bytes until we have a byte sequence of
total length == AVR_Datagram.full_dgram_len().
"""
d_start = AVR_Datagram.expect_dgram_start(dgram_spec)
assert isinstance(d_start, bytes)
d_len = AVR_Datagram.full_dgram_len(dgram_spec)
assert len(d_start) < d_len
assert len(self.readbuf) < d_len
# self.debug("Have %u bytes" % (len(self.readbuf)))
self.readbuf += self.ser.read(d_len - len(self.readbuf))
if len(self.readbuf) < d_len:
# self.debug("Incomplete dgram (got %u/%u bytes): %s" % (
# len(self.readbuf), d_len,
# self.human_readable(self.readbuf)))
return
# Find start of datagram
i = self.readbuf.find(d_start)
if i < 0: # beyond len(self.readbuf) - len(d_start)
# self.debug("No start of dgram in %u bytes: %s" % (
# len(self.readbuf),
# self.human_readable(self.readbuf)))
self.readbuf = self.readbuf[-(len(d_start) - 1):]
return
elif i > 0: # dgram starts at index i
# self.debug("dgram starts at index %u in %s" % (i,
# self.human_readable(self.readbuf)))
self.readbuf = self.readbuf[i:]
assert self.readbuf.startswith(d_start)
if len(self.readbuf) < d_len:
return
# self.debug("parsing self.readbuf: %s" % (
# self.human_readable(self.readbuf)))
dgram, self.readbuf = self.readbuf[:d_len], self.readbuf[d_len:]
assert isinstance(dgram, bytes)
data = AVR_Datagram.parse_dgram(dgram, dgram_spec)
status = AVR_Status.from_dgram(data)
if self.state.update(status):
self.debug("%s\n\t\t-> %s" % (status, self.state))
if self.status_handler:
self.status_handler(status)
self.ready_to_write(True)
def handle_read(self, dgram_spec=AVR_Datagram.AVR_PC_Status):
"""Attempt to read a datagram from the serial port.
Look for a bytes matching AVR_Datagram.expect_dgram_start(),
and read additional bytes until we have a byte sequence of
total length == AVR_Datagram.full_dgram_len().
"""
d_start = AVR_Datagram.expect_dgram_start(dgram_spec)
assert isinstance(d_start, bytes)
d_len = AVR_Datagram.full_dgram_len(dgram_spec)
assert len(d_start) < d_len
assert len(self.readbuf) < d_len
# self.debug("Have %u bytes" % (len(self.readbuf)))
self.readbuf += self.ser.read(d_len - len(self.readbuf))
if len(self.readbuf) < d_len:
# self.debug("Incomplete dgram (got %u/%u bytes): %s" % (
# len(self.readbuf), d_len,
# self.human_readable(self.readbuf)))
return
# Find start of datagram
i = self.readbuf.find(d_start)
if i < 0: # beyond len(self.readbuf) - len(d_start)
# self.debug("No start of dgram in %u bytes: %s" % (
# len(self.readbuf),
# self.human_readable(self.readbuf)))
self.readbuf = self.readbuf[-(len(d_start) - 1):]
return
elif i > 0: # dgram starts at index i
# self.debug("dgram starts at index %u in %s" % (i,
# self.human_readable(self.readbuf)))
self.readbuf = self.readbuf[i:]
assert self.readbuf.startswith(d_start)
if len(self.readbuf) < d_len:
return
# self.debug("parsing self.readbuf: %s" % (
# self.human_readable(self.readbuf)))
dgram, self.readbuf = self.readbuf[:d_len], self.readbuf[d_len:]
assert isinstance(dgram, bytes)
data = AVR_Datagram.parse_dgram(dgram, dgram_spec)
status = AVR_Status.from_dgram(data)
if self.state.update(status):
self.debug("%s\n\t\t-> %s" % (status, self.state))
if self.status_handler:
self.status_handler(status)
self.ready_to_write(True)
def handle_read(self):
self.recv_data += os.read(self.master, 1024)
while len(self.recv_data) >= self.recv_dgram_len:
dgram = self.recv_data[:self.recv_dgram_len]
self.recv_data = self.recv_data[self.recv_dgram_len:]
self.handle_command(AVR_Command.from_dgram(
AVR_Datagram.parse_dgram(dgram, self.RecvDGramSpec)))
def handle_cmd(self, cmd, rest):
if self.state.off:
self.debug("Discarding '%s' while AVR is off" % (cmd))
return
self.debug("Handling '%s'" % (cmd))
avr, cmd = cmd.split(" ", 1)
assert avr == self.name
assert cmd in self.Commands
assert not rest
command = self.Commands[cmd]
assert callable(command)
for command_str in command(self):
avr_cmd = AVR_Command(command_str)
dgram_spec = AVR_Datagram.PC_AVR_Command
dgram = AVR_Datagram.build_dgram(avr_cmd.dgram(), dgram_spec)
self.schedule_write(dgram)
def handle_cmd(self, cmd, rest):
if self.state.off:
self.debug("Discarding '%s' while AVR is off" % (cmd))
return
self.debug("Handling '%s'" % (cmd))
avr, cmd = cmd.split(" ", 1)
assert avr == self.name
assert cmd in self.Commands
assert not rest
command = self.Commands[cmd]
assert callable(command)
for command_str in command(self):
avr_cmd = AVR_Command(command_str)
dgram_spec = AVR_Datagram.PC_AVR_Command
dgram = AVR_Datagram.build_dgram(avr_cmd.dgram(), dgram_spec)
self.schedule_write(dgram)
def __init__(self, av_loop, name):
Fake_SerialDevice.__init__(self, av_loop, name)
self.standby = True
self.mute = False
self.volume = -35 # dB
self.status_queue = TimedQueue(self.gen_status("standby"))
self.write_timer = PeriodicCallback(self.write_now, 50, av_loop)
self.write_timer.start()
self.recv_dgram_len = AVR_Datagram.full_dgram_len(self.RecvDGramSpec)
self.recv_data = "" # Receive buffer
self.t0 = time.time()
def write_now(self):
os.write(self.master, AVR_Datagram.build_dgram(
self.status().dgram(), self.SendDGramSpec))