Example 11: Text Direction

examples/ex11_qwiic_serlcd_text_direction.py
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#!/usr/bin/env python
#-----------------------------------------------------------------------------
# ex11_qwiic_serlcd_text_direction.py
#
# This example demonstrates how to use leftToRight() and rightToLeft()
# to change the where the next character will be printed.
#
#------------------------------------------------------------------------
#
# Written by SparkFun Electronics, August 2020
#
# Ported from Arduino Library code with many contributions from
# Gaston Williams - August 29, 2018
# 
# This python library supports the SparkFun Electroncis qwiic 
# qwiic sensor/board ecosystem on a Raspberry Pi (and compatable) single
# board computers. 
#
# More information on qwiic is at https://www.sparkfun.com/qwiic
#
# Do you like this library? Help support SparkFun. Buy a board!
#
#==================================================================================
# Copyright (c) 2020 SparkFun Electronics
#
# Permission is hereby granted, free of charge, to any person obtaining a copy 
# of this software and associated documentation files (the "Software"), to deal 
# in the Software without restriction, including without limitation the rights 
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 
# copies of the Software, and to permit persons to whom the Software is 
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all 
# copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 
# SOFTWARE.
#==================================================================================
# Example 11
#

from __future__ import print_function
import qwiic_serlcd
import time
import sys

def runExample():

	print("\nSparkFun Qwiic SerLCD   Example 11\n")
	myLCD = qwiic_serlcd.QwiicSerlcd()

	if myLCD.connected == False:
		print("The Qwiic SerLCD device isn't connected to the system. Please check your connection", \
			file=sys.stderr)
		return

	myLCD.setBacklight(255, 255, 255) # Set backlight to bright white
	myLCD.setContrast(5) # set contrast. Lower to 0 for higher contrast.
	myLCD.begin() # call this for default settings (no
	myLCD.leftToRight()
	myLCD.cursor()
	time.sleep(1) # give a sec for system messages to complete

	thisChar = 'a'

	while True:
		
		if thisChar == 'j': # reverse directions at 'm'
			myLCD.rightToLeft() # go right for the next letter
		
		if thisChar == 'q': # reverse again at 's'
			myLCD.leftToRight() # go left for the next letter
			time.sleep(1)
		
		if thisChar > 'z': # reset at 'z'
			myLCD.home() # go to (0,0)
			myLCD.clearScreen() # clear screen
			thisChar = 'a' # start again at 0
		
		myLCD.print(thisChar) # print the character
		time.sleep(0.5) # wait a second
		thisChar = chr(ord(thisChar) + 1) # increment the letter

if __name__ == '__main__':
	try:
		runExample()
	except (KeyboardInterrupt, SystemExit) as exErr:
		print("\nEnding Example 11")
		sys.exit(0)