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Adafruit_CharLCDPlate.py
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#!/usr/bin/pythonhttp://raspberrypi.local/editor
#
# based on code from lrvick and LiquidCrystal
# lrvic - https://github.com/lrvick/raspi-hd44780/blob/master/hd44780.py
# LiquidCrystal - https://github.com/arduino/Arduino/blob/master/libraries/LiquidCrystal/LiquidCrystal.cpp
#
from time import sleep
from Adafruit_I2C import Adafruit_I2C
from Adafruit_MCP230xx import Adafruit_MCP230XX
import smbus
class Adafruit_CharLCDPlate:
OUTPUT = 0
INPUT = 1
# LED colors
RED = 0x01
GREEN = 0x02
BLUE = 0x04
YELLOW = 0x03
TEAL = 0x06
VIOLET = 0x05
ON = 0x07
OFF = 0x0
# buttons
SELECT = 0
RIGHT = 1
DOWN = 2
UP = 3
LEFT = 4
# commands
LCD_CLEARDISPLAY = 0x01
LCD_RETURNHOME = 0x02
LCD_ENTRYMODESET = 0x04
LCD_DISPLAYCONTROL = 0x08
LCD_CURSORSHIFT = 0x10
LCD_FUNCTIONSET = 0x20
LCD_SETCGRAMADDR = 0x40
LCD_SETDDRAMADDR = 0x80
# flags for display entry mode
LCD_ENTRYRIGHT = 0x00
LCD_ENTRYLEFT = 0x02
LCD_ENTRYSHIFTINCREMENT = 0x01
LCD_ENTRYSHIFTDECREMENT = 0x00
# flags for display on/off control
LCD_DISPLAYON = 0x04
LCD_DISPLAYOFF = 0x00
LCD_CURSORON = 0x02
LCD_CURSOROFF = 0x00
LCD_BLINKON = 0x01
LCD_BLINKOFF = 0x00
# flags for display/cursor shift
LCD_DISPLAYMOVE = 0x08
LCD_CURSORMOVE = 0x00
# flags for display/cursor shift
LCD_DISPLAYMOVE = 0x08
LCD_CURSORMOVE = 0x00
LCD_MOVERIGHT = 0x04
LCD_MOVELEFT = 0x00
# flags for function set
LCD_8BITMODE = 0x10
LCD_4BITMODE = 0x00
LCD_2LINE = 0x08
LCD_1LINE = 0x00
LCD_5x10DOTS = 0x04
LCD_5x8DOTS = 0x00
def __init__(self, busnum=0, pin_rs=15, pin_e=13, pins_db=[12, 11, 10, 9], pin_rw=14):
self.pin_rs = pin_rs
self.pin_e = pin_e
self.pin_rw = pin_rw
self.pins_db = pins_db
self.mcp = Adafruit_MCP230XX(busnum = busnum, address = 0x20, num_gpios = 16)
self.mcp.config(self.pin_e, self.OUTPUT)
self.mcp.config(self.pin_rs, self.OUTPUT)
self.mcp.config(self.pin_rw, self.OUTPUT)
self.mcp.output(self.pin_rw, 0)
self.mcp.output(self.pin_e, 0)
for pin in self.pins_db:
self.mcp.config(pin, self.OUTPUT)
self.write4bits(0x33) # initialization
self.write4bits(0x32) # initialization
self.write4bits(0x28) # 2 line 5x7 matrix
self.write4bits(0x0C) # turn cursor off 0x0E to enable cursor
self.write4bits(0x06) # shift cursor right
self.displaycontrol = self.LCD_DISPLAYON | self.LCD_CURSOROFF | self.LCD_BLINKOFF
self.displayfunction = self.LCD_4BITMODE | self.LCD_1LINE | self.LCD_5x8DOTS
self.displayfunction |= self.LCD_2LINE
""" Initialize to default text direction (for romance languages) """
self.displaymode = self.LCD_ENTRYLEFT | self.LCD_ENTRYSHIFTDECREMENT
self.write4bits(self.LCD_ENTRYMODESET | self.displaymode) # set the entry mode
# turn on backlights!
self.mcp.config(6, self.mcp.OUTPUT)
self.mcp.config(7, self.mcp.OUTPUT)
self.mcp.config(8, self.mcp.OUTPUT)
self.mcp.output(6, 0) # red
self.mcp.output(7, 0) # green
self.mcp.output(8, 0) # blue
# turn on pullups
self.mcp.pullup(self.SELECT, True)
self.mcp.pullup(self.LEFT, True)
self.mcp.pullup(self.RIGHT, True)
self.mcp.pullup(self.UP, True)
self.mcp.pullup(self.DOWN, True)
self.mcp.config(self.SELECT, self.mcp.INPUT)
self.mcp.config(self.LEFT, self.mcp.INPUT)
self.mcp.config(self.RIGHT, self.mcp.INPUT)
self.mcp.config(self.DOWN, self.mcp.INPUT)
self.mcp.config(self.UP, self.mcp.INPUT)
def begin(self, cols, lines):
if (lines > 1):
self.numlines = lines
self.displayfunction |= self.LCD_2LINE
self.currline = 0
self.clear()
def home(self):
self.write4bits(self.LCD_RETURNHOME) # set cursor position to zero
self.delayMicroseconds(2000) # this command takes a long time!
def clear(self):
self.write4bits(self.LCD_CLEARDISPLAY) # command to clear display
self.delayMicroseconds(2000) # 2000 microsecond sleep, clearing the display takes a long time
def setCursor(self, col, row):
self.row_offsets = [ 0x00, 0x40, 0x14, 0x54 ]
if ( row > self.numlines ):
row = self.numlines - 1 # we count rows starting w/0
self.write4bits(self.LCD_SETDDRAMADDR | (col + self.row_offsets[row]))
def noDisplay(self):
""" Turn the display off (quickly) """
self.displaycontrol &= ~self.LCD_DISPLAYON
self.write4bits(self.LCD_DISPLAYCONTROL | self.displaycontrol)
def display(self):
""" Turn the display on (quickly) """
self.displaycontrol |= self.LCD_DISPLAYON
self.write4bits(self.LCD_DISPLAYCONTROL | self.displaycontrol)
def noCursor(self):
""" Turns the underline cursor on/off """
self.displaycontrol &= ~self.LCD_CURSORON
self.write4bits(self.LCD_DISPLAYCONTROL | self.displaycontrol)
def cursor(self):
""" Cursor On """
self.displaycontrol |= self.LCD_CURSORON
self.write4bits(self.LCD_DISPLAYCONTROL | self.displaycontrol)
def noBlink(self):
""" Turn on and off the blinking cursor """
self.displaycontrol &= ~self.LCD_BLINKON
self.write4bits(self.LCD_DISPLAYCONTROL | self.displaycontrol)
def noBlink(self):
""" Turn on and off the blinking cursor """
self.displaycontrol &= ~self.LCD_BLINKON
self.write4bits(self.LCD_DISPLAYCONTROL | self.displaycontrol)
def DisplayLeft(self):
""" These commands scroll the display without changing the RAM """
self.write4bits(self.LCD_CURSORSHIFT | self.LCD_DISPLAYMOVE | self.LCD_MOVELEFT)
def scrollDisplayRight(self):
""" These commands scroll the display without changing the RAM """
self.write4bits(self.LCD_CURSORSHIFT | self.LCD_DISPLAYMOVE | self.LCD_MOVERIGHT);
def leftToRight(self):
""" This is for text that flows Left to Right """
self.displaymode |= self.LCD_ENTRYLEFT
self.write4bits(self.LCD_ENTRYMODESET | self.displaymode);
def rightToLeft(self):
""" This is for text that flows Right to Left """
self.displaymode &= ~self.LCD_ENTRYLEFT
self.write4bits(self.LCD_ENTRYMODESET | self.displaymode)
def autoscroll(self):
""" This will 'right justify' text from the cursor """
self.displaymode |= self.LCD_ENTRYSHIFTINCREMENT
self.write4bits(self.LCD_ENTRYMODESET | self.displaymode)
def noAutoscroll(self):
""" This will 'left justify' text from the cursor """
self.displaymode &= ~self.LCD_ENTRYSHIFTINCREMENT
self.write4bits(self.LCD_ENTRYMODESET | self.displaymode)
def createChar(self, location, bitmap):
self.write4bits(self.LCD_SETCGRAMADDR | ((location & 7) << 3))
for i in range(8):
self.write4bits(bitmap[i], True)
self.write4bits(self.LCD_SETDDRAMADDR)
def write4bits(self, bits, char_mode=False):
""" Send command to LCD """
#self.delayMicroseconds(1000) # 1000 microsecond sleep
bits=bin(bits)[2:].zfill(8)
self.mcp.output(self.pin_rs, char_mode)
for i in range(4):
if bits[i] == "1":
self.mcp.output(self.pins_db[::-1][i], True)
else:
self.mcp.output(self.pins_db[::-1][i], False)
self.pulseEnable()
for i in range(4,8):
if bits[i] == "1":
self.mcp.output(self.pins_db[::-1][i-4], True)
else:
self.mcp.output(self.pins_db[::-1][i-4], False)
self.pulseEnable()
def delayMicroseconds(self, microseconds):
seconds = microseconds / 1000000 # divide microseconds by 1 million for seconds
sleep(seconds)
def pulseEnable(self):
self.mcp.output(self.pin_e, True)
self.delayMicroseconds(1) # 1 microsecond pause - enable pulse must be > 450ns
self.mcp.output(self.pin_e, False)
#self.delayMicroseconds(1) # commands need > 37us to settle
def message(self, text):
""" Send string to LCD. Newline wraps to second line"""
for char in text:
if char == '\n':
self.write4bits(0xC0) # next line
else:
self.write4bits(ord(char),True)
def backlight(self, color):
self.mcp.output(6, not color & 0x01)
self.mcp.output(7, not color & 0x02)
self.mcp.output(8, not color & 0x04)
def buttonPressed(self, buttonname):
if (buttonname > self.LEFT):
return false
return not self.mcp.input(buttonname)
if __name__ == '__main__':
lcd = Adafruit_CharLCDPlate(busnum = 0)
lcd.clear()
lcd.message("Adafruit RGB LCD\nPlate w/Keypad!")
sleep(1)
while 1:
if (lcd.buttonPressed(lcd.LEFT)):
lcd.backlight(lcd.RED)
if (lcd.buttonPressed(lcd.UP)):
lcd.backlight(lcd.BLUE)
if (lcd.buttonPressed(lcd.DOWN)):
lcd.backlight(lcd.GREEN)
if (lcd.buttonPressed(lcd.RIGHT)):
lcd.backlight(lcd.VIOLET)
if (lcd.buttonPressed(lcd.SELECT)):
lcd.backlight(lcd.ON)
while 1:
lcd.backlight(lcd.RED)
sleep(1)
lcd.backlight(lcd.YELLOW)
sleep(1)
lcd.backlight(lcd.GREEN)
sleep(1)
lcd.backlight(lcd.TEAL)
sleep(1)
lcd.backlight(lcd.BLUE)
sleep(1)
lcd.backlight(lcd.VIOLET)
sleep(1)
lcd.backlight(lcd.ON)
sleep(1)
lcd.backlight(lcd.OFF)
sleep(1)