Added initial Piface compatibility.

lcd_piface_class.py

@@ -0,0 +1,221 @@
+#!/usr/bin/env python
+# -*- coding: latin-1 -*-
+#
+# $Id: lcd_piface_class.py,v 1.25 2015/01/03 14:45:41 patrick Exp $
+# Raspberry Pi Internet Radio
+# using a Piface backlit LCD plate
+#
+# Author : Bob Rathbone
+# Site   : http://bobrathbone.com
+# Modified by Patrick Zacharias for use with PiFace
+#
+# From original LCD routines : piface.co.uk
+# Site   : http://piface.github.io/pifacecad
+#
+# To use this program you need pifacecommon and pifacecad installed
+# for their respective Python versions
+#
+# At the moment this program can only be executed with Python2.7
+#
+# This program uses  Music Player Daemon 'mpd'and it's client 'mpc'
+# See http://mpd.wikia.com/wiki/Music_Player_Daemon_Wiki
+#
+# License: GNU V3, See https://www.gnu.org/copyleft/gpl.html
+#
+# Disclaimer: Software is provided as is and absolutly no warranties are implied or given.
+#	     The authors shall not be liable for any loss or damage however caused.
+#
+
+import os
+import time
+from translate_class import Translate
+
+import subprocess
+import pifacecommon
+import pifacecad
+from pifacecad.lcd import LCD_WIDTH
+
+PLAY_SYMBOL = pifacecad.LCDBitmap(
+    [0x10, 0x18, 0x1c, 0x1e, 0x1c, 0x18, 0x10, 0x0])
+PAUSE_SYMBOL = pifacecad.LCDBitmap(
+    [0x0, 0x1b, 0x1b, 0x1b, 0x1b, 0x1b, 0x0, 0x0])
+INFO_SYMBOL = pifacecad.LCDBitmap(
+    [0x6, 0x6, 0x0, 0x1e, 0xe, 0xe, 0xe, 0x1f])
+MUSIC_SYMBOL = pifacecad.LCDBitmap(
+    [0x2, 0x3, 0x2, 0x2, 0xe, 0x1e, 0xc, 0x0])
+
+PLAY_SYMBOL_INDEX = 0
+PAUSE_SYMBOL_INDEX = 1
+INFO_SYMBOL_INDEX = 2
+MUSIC_SYMBOL_INDEX = 3
+#Symbols were taken from the pifacecad examples and aren't in use yet
+
+# The wiring for the LCD is as follows:
+# 1 : GND
+# 2 : 5V
+# 3 : Contrast (0-5V)*
+# 4 : RS (Register Select)
+# 5 : R/W (Read Write)       - GROUND THIS PIN
+# 6 : Enable or Strobe
+# 7 : Data Bit 0	     - NOT USED
+# 8 : Data Bit 1	     - NOT USED
+# 9 : Data Bit 2	     - NOT USED
+# 10: Data Bit 3	     - NOT USED
+# 11: Data Bit 4
+# 12: Data Bit 5
+# 13: Data Bit 6
+# 14: Data Bit 7
+# 15: LCD Backlight +5V**
+# 16: LCD Backlight GND
+
+
+# Define LCD device constants
+LCD_WIDTH = 16    # Default characters per line
+LCD_CHR = True
+LCD_CMD = False
+
+# Timing constants
+E_PULSE = 0.00005
+E_DELAY = 0.00005
+
+
+translate = Translate()
+
+# Lcd Class 
+class Lcd:
+	width = LCD_WIDTH
+	RawMode = False
+	ScrollSpeed = 0.3	# Default scroll speed
+
+
+	# Port expander input pin definitions
+#	MENU  = 0
+#	RIGHT = 1
+#	DOWN  = 2
+#	UP    = 3
+#	LEFT  = 4
+
+	LEFT = 0
+	DOWN = 1
+	UP   = 2
+	RIGHT= 3
+	MENU = 4
+
+	def __init__(self):
+#		self.cad = pifacecad.pifacecad()
+		return
+
+	def init(self):
+	# LED outputs
+		self.cad = pifacecad.PiFaceCAD()
+		# set up cad
+		self.cad.lcd.blink_off()
+		self.cad.lcd.cursor_off()
+		self.cad.lcd.backlight_on()
+
+		self.cad.lcd.store_custom_bitmap(PLAY_SYMBOL_INDEX, PLAY_SYMBOL)
+		self.cad.lcd.store_custom_bitmap(PAUSE_SYMBOL_INDEX, PAUSE_SYMBOL)
+		self.cad.lcd.store_custom_bitmap(INFO_SYMBOL_INDEX, INFO_SYMBOL)
+		return
+
+
+	# Set the display width
+	def setWidth(self,width):
+		self.width = width
+		return
+
+	# Send string to display
+	def _string(self,message):
+		s = message.ljust(self.width," ")
+		if not self.RawMode:
+			s = translate.toLCD(s)
+		self.cad.lcd.write(s)
+		return
+
+	# Display Line 1 on LED
+	def line1(self,text):
+		self.cad.lcd.set_cursor(0, 0)
+		self._string(text)
+		return
+
+	# Display Line 2 on LED
+	def line2(self,text):
+		self.cad.lcd.set_cursor(0, 1)
+		self._string(text)
+		return
+
+	# Scroll message on line 1
+	def scroll1(self,mytext,interrupt):
+		self._scroll(mytext,0,interrupt)
+		return
+
+	# Scroll message on line 2
+	def scroll2(self,mytext,interrupt):
+		self._scroll(mytext,1,interrupt)
+		return
+
+
+	# Scroll line - interrupt() breaks out routine if True
+	def _scroll(self,mytext,line,interrupt):
+		ilen = len(mytext)
+		skip = False
+
+                self.cad.lcd.set_cursor(0, line)
+		self._string(mytext[0:self.width + 1])
+
+		if (ilen <= self.width):
+			skip = True
+
+		if not skip:
+			for i in range(0, 5):
+				time.sleep(0.2)
+				if interrupt():
+					skip = True
+					break
+
+		if not skip:
+			for i in range(0, ilen - self.width + 1 ):
+			#	self._byte_out(line, LCD_CMD)
+				self.cad.lcd.set_cursor(0, line)
+				self._string(mytext[i:i+self.width])
+				if interrupt():
+					skip = True
+					break
+				time.sleep(self.ScrollSpeed)
+
+		if not skip:
+			for i in range(0, 5):
+				time.sleep(0.2)
+				if interrupt():
+					break
+		return
+
+	# Set Scroll line speed - Best values are 0.2 and 0.3
+	# Limit to between 0.05 and 1.0
+	def setScrollSpeed(self,speed):
+		if speed < 0.05:
+			speed = 0.2
+		elif speed > 1.0:
+			speed = 0.3
+		self.ScrollSpeed = speed
+		return
+
+	# Set raw mode on (No translation)
+	def setRawMode(self,value):
+		self.RawMode = value
+		return
+
+	# Read state of single button
+	def buttonPressed(self, b):
+		button =  self.cad.switches[b].value
+		return button
+	# Clear the display
+	def clear(self):
+		self.cad.lcd.clear()
+
+	# Sets cursor home
+	def home(self):
+		self.cad.lcd.home()
+
+
+# End of Lcd class