def __init__(self):
self.__dict__ = self._shared_state
self.parport = ParPort()
if not hasattr(self, 'last_send'):
self.last_send = datetime.now()
if hasattr(self, 'inited'):
if self.inited:
log.warning('LCD connection has already been established')
else:
log.warning('re-establishing LCD connection')
self._cominit()
else:
self.inited = False
self.comlock = Lock()
self._cominit()
class LCD(object):
_shared_state = {}
def _cominit(self):
with self.comlock:
self.comconn = serial.Serial(
port=settings.LCD_PORT,
baudrate=9600,
parity=serial.PARITY_NONE,
stopbits=serial.STOPBITS_ONE,
bytesize=serial.EIGHTBITS,
)
self.comconn.open()
assert self.comconn.isOpen()
self.inited = True
log.info('LCD connection established')
def __init__(self):
self.__dict__ = self._shared_state
self.parport = ParPort()
if not hasattr(self, 'last_send'):
self.last_send = datetime.now()
if hasattr(self, 'inited'):
if self.inited:
log.warning('LCD connection has already been established')
else:
log.warning('re-establishing LCD connection')
self._cominit()
else:
self.inited = False
self.comlock = Lock()
self._cominit()
def blank(self):
entered = datetime.now()
with self.comlock:
delta = entered - self.last_send
if delta.total_seconds() < settings.LCD_BLANK_SECONDS:
return
log.info('blanking %r' % self)
self.comconn.write(CMD_CLEAR)
self.parport.blank()
def send(self, msgs, ok=True):
"""Send to terminal. An `Output` object is created from `msgs`
internally."""
log.info('sending to %r' % self)
self.last_send = datetime.now()
output = Output(msgs)
to_send = CMD_CLEAR
for precmd, line in zip(CMD_ROWS, output.lines):
to_send += precmd + line.msg
with self.comlock:
# FIXME: should not be here
if ok:
self.parport.order_ok()
else:
self.parport.order_bad()
self.comconn.write(to_send)
self.last_send = datetime.now()
log.info('sent: %r' % to_send)
log.info('preview: %s' % output.preview())
sleep(settings.LCD_BLANK_SECONDS)
self.blank()
def close(self):
with self.comlock:
if self.comconn.isOpen():
self.comconn.close()
else:
log.warning('close() called but serial connection already closed')
self.inited = False
log.info('LCD connection closed')
def __del__(self):
self.close()