Sparkfun LCD control

lcd.py

# -*- coding: utf-8 -*-
'''
Serial LCD control

Control Sparkfun LCD-10097 with DEV-09716
'''

from serial import Serial
from time import sleep

# For binary commands
from struct import pack

class SerialLCD:
  '''Serial LCD communication'''
  def __init__(self, port='COM2', baud=9600, debug=False):
    try:
      self.ser = \
      Serial(
        port = port,
        baudrate = baud,
        bytesize = 8,
        parity='N', stopbits=1, timeout=1
      )
      if debug and self.ser.isOpen():
        print 'Successfully opened', self.port
      elif debug:
        print 'Failed to open', self.port
        return
    except:
      self.ser.close() # since an exception leaves the COM port open
      raise
  
  def special_command(self, command):
    format = 'BB'
    special_command_byte = 0xFE
    byte = pack(format, special_command_byte, command)
    self.write(byte)
  
  def write(self, command, wait=0, debug=False):
    if debug:
      print 'Writing', command
    self.ser.write(command)
    if wait is not 0:
      sleep(wait)
  
  def clear(self):
    self.special_command(0x01)


if __name__ == '__main__':
  s = SerialLCD()
  while 1:
    s.clear()
    s.write('Hello', 1)
    s.clear()
    s.write('World', 1)