8000 ex7 scroll working · sparkfun/qwiic_serlcd_py@4b7ec11 · GitHub
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Pete Lewis
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ex7 scroll working
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‎examples/ex7_qwiic_serlcd_scroll.py

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#!/usr/bin/env python
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#-----------------------------------------------------------------------------
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# ex7_qwiic_serlcd_scroll.py
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#
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# Simple example demonstrating the scroll controls on the SerLCD (Qwiic).
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#
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# This example prints "Hello World!" to the LCD and uses the
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# scrollDisplayLeft() and scrollDisplayRight() methods to scroll
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# the text.
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#------------------------------------------------------------------------
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#
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# Written by SparkFun Electronics, August 2020
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#
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# Ported from Arduino Library code with many contributions from
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# Gaston Williams - August 29, 2018
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#
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# This python library supports the SparkFun Electroncis qwiic
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# qwiic sensor/board ecosystem on a Raspberry Pi (and compatable) single
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# board computers.
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#
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# More information on qwiic is at https://www.sparkfun.com/qwiic
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#
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# Do you like this library? Help support SparkFun. Buy a board!
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#
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#==================================================================================
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# Copyright (c) 2020 SparkFun Electronics
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#
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# Permission is hereby granted, free of charge, to any person obtaining a copy
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# of this software and associated documentation files (the "Software"), to deal
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# in the Software without restriction, including without limitation the rights
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# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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# copies of the Software, and to permit persons to whom the Software is
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# furnished to do so, subject to the following conditions:
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#
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# The above copyright notice and this permission notice shall be included in all
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# copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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# SOFTWARE.
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#==================================================================================
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# Example 7
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#
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from __future__ import print_function
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import qwiic_serlcd
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import time
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import sys
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def runExample():
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print("\nSparkFun Qwiic SerLCD Example 7\n")
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myLCD = qwiic_serlcd.QwiicSerlcd()
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if myLCD.connected == False:
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print("The Qwiic SerLCD device isn't connected to the system. Please check your connection", \
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file=sys.stderr)
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return
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myLCD.setBacklight(255, 255, 255) # Set backlight to bright white
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myLCD.setContrast(5) # set contrast. Lower to 0 for higher contrast.
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myLCD.clearScreen()
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myLCD.cursor() # Turn on the underline cursor
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time.sleep(1) # give a sec for system messages to complete
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myLCD.print("Hello World!")
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while True:
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# scroll 13 positions (string length) to the left
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# to move it offscreen left:
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for i in range(13):
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myLCD.scrollDisplayLeft() # scroll one position left
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time.sleep(0.15) # wait a bit
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# scroll 29 positions (string length + display length) to the right
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# to move it offscreen right:
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for i in range(29):
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myLCD.scrollDisplayRight() # scroll one position right
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time.sleep(0.15) # wait a bit
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# scroll 16 positions (display length + string length) to the left
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# to move it back to center:
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for i in range(16):
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myLCD.scrollDisplayLeft() # scroll one position left
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time.sleep(0.15) # wait a bit
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time.sleep(1) # delay at the end of the full loop
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if __name__ == '__main__':
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try:
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runExample()
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except (KeyboardInterrupt, SystemExit) as exErr:
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print("\nEnding Example 7")
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sys.exit(0)
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‎qwiic_serlcd.py

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"""
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self._displayControl &= ~LCD_BLINKON
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return self.specialCommand(LCD_DISPLAYCONTROL | self._displayControl)
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# ----------------------------------
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# scrollDisplayLeft()
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#
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# Scroll the display one or multiple characters to the left, without changing the text.
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def scrollDisplayLeft(self, count = 1):
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"""
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Scroll the display one or multiple characters to the left, without changing the text.
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:param count: Number of character spaces you'd like to scroll
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:return: Returns true if the I2C write was successful, otherwise False.
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:rtype: bool
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"""
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return self.specialCommand(LCD_CURSORSHIFT | LCD_DISPLAYMOVE | LCD_MOVELEFT, count)
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# ----------------------------------
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# scrollDisplayRight()
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#
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# Scroll the display one or multiple characters to the right, without changing the text.
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def scrollDisplayRight(self, count = 1):
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"""
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Scroll the display one or multiple characters to the right, without changing the text.
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:param count: Number of character spaces you'd like to scroll
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:return: Returns true if the I2C write was successful, otherwise False.
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:rtype: bool
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"""
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return self.specialCommand(LCD_CURSORSHIFT | LCD_DISPLAYMOVE | LCD_MOVERIGHT, count)

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