yay lcd plate

Author: root

Adafruit_CharLCDPlate/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
+
+OUTPUT = 0
+INPUT = 1
+mcp = Adafruit_MCP230XX(busnum = 0, address = 0x20, num_gpios = 16)
+
+
+class Adafruit_CharLCD:
+
+    # 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, pin_rs=25, pin_e=24, pins_db=[23, 17, 21, 22], pin_rw=0):
+        self.pin_rs = pin_rs
+        self.pin_e = pin_e
+        self.pin_rw = pin_rw
+        self.pins_db = pins_db
+
+        mcp.config(self.pin_e, OUTPUT)
+        mcp.config(self.pin_rs,  OUTPUT)
+        mcp.config(self.pin_rw,  OUTPUT)
+        mcp.output(self.pin_rw, 0)
+        mcp.output(self.pin_e, 0)
+        
+        for pin in self.pins_db:
+            mcp.config(pin,  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
+
+
+    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 write4bits(self, bits, char_mode=False):
+        """ Send command to LCD """
+        #self.delayMicroseconds(1000) # 1000 microsecond sleep
+        bits=bin(bits)[2:].zfill(8)
+        mcp.output(self.pin_rs, char_mode)
+
+        for i in range(4):
+            if bits[i] == "1":
+                mcp.output(self.pins_db[::-1][i], True)
+            else:
+                mcp.output(self.pins_db[::-1][i], False)
+        self.pulseEnable()
+
+        for i in range(4,8):
+            if bits[i] == "1":
+                mcp.output(self.pins_db[::-1][i-4], True)
+            else:
+                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):
+        mcp.output(self.pin_e, True)
+        self.delayMicroseconds(1)		# 1 microsecond pause - enable pulse must be > 450ns 
+        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)
+
+
+
+if __name__ == '__main__':
+
+
+    # input test
+#    for i in range(16):
+#        mcp.pullup(i, 1)
+#    while (True):
+#        for i in range(16):
+#           print "%d: %x" % (i, mcp.input(i) >> i)
+    mcp.config(6, OUTPUT)
+    mcp.config(7, OUTPUT)
+    mcp.config(8, OUTPUT)
+    mcp.output(6, 0) # red
+    mcp.output(7, 0) # green 
+    mcp.output(8, 0) # blue
+
+    lcd = Adafruit_CharLCD(15, 13, [12,11,10,9], 14)
+    lcd.clear()
+    lcd.message("Adafruit RGB LCD\nPlate w/Keypad!")
+    while 1:
+		mcp.output(6, 0) # red
+		mcp.output(7, 1) # green 
+		mcp.output(8, 1) # blue
+		sleep(1)
+		mcp.output(7, 0) # green 
+		sleep(1)
+		mcp.output(6, 1) # red
+		sleep(1)
+		mcp.output(8, 0) # blue
+		sleep(1)
+		mcp.output(7, 1) # green 
+		sleep(1)
+		mcp.output(6, 0) # red
+		sleep(1)
+    

Adafruit_CharLCDPlate/Adafruit_I2C.py

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+../../Adafruit-Raspberry-Pi-Python-Code/Adafruit_I2C/Adafruit_I2C.py

Adafruit_CharLCDPlate/Adafruit_MCP230xx.py

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+../../Adafruit-Raspberry-Pi-Python-Code/Adafruit_MCP230xx/Adafruit_MCP230xx.py