#!/usr/bin/python # -*- coding: latin-1 -*- #-------------------------------------- # ___ ___ _ ____ # / _ \/ _ \(_) __/__ __ __ # / , _/ ___/ /\ \/ _ \/ // / # /_/|_/_/ /_/___/ .__/\_, / # /_/ /___/ # # lcd_i2c.py # LCD test script using I2C backpack. # Supports 16x2 and 20x4 screens. # # Author : Matt Hawkins # Date : 20/09/2015 # # http://www.raspberrypi-spy.co.uk/ # # Copyright 2015 Matt Hawkins # # This program is free software: you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation, either version 3 of the License, or # (at your option) any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program. If not, see . # #-------------------------------------- import smbus import time from datetime import date import atexit # Define some device parameters I2C_ADDR = 0x27 # I2C device address LCD_WIDTH = 20 # Maximum characters per line # Define some device constants LCD_CHR = 1 # Mode - Sending data LCD_CMD = 0 # Mode - Sending command LCD_LINE_1 = 0x80 # LCD RAM address for the 1st line LCD_LINE_2 = 0xC0 # LCD RAM address for the 2nd line LCD_LINE_3 = 0x94 # LCD RAM address for the 3rd line LCD_LINE_4 = 0xD4 # LCD RAM address for the 4th line LCD_BACKLIGHT = 0x08 # On #LCD_BACKLIGHT = 0x00 # Off ENABLE = 0b00000100 # Enable bit lastMSG = [] lastMSG.append("nix") lastMSG.append("nix") lastMSG.append("nix") lastMSG.append("nix") lastMSG.append("nix") lstMSGi = [] lstMSGi.append(1) lstMSGi.append(1) lstMSGi.append(1) lstMSGi.append(1) lstMSGi.append(1) # Timing constants E_PULSE = 0.0005 E_DELAY = 0.0005 #Open I2C interface #bus = smbus.SMBus(0) # Rev 1 Pi uses 0 bus = smbus.SMBus(1) # Rev 2 Pi uses 1 def lcd_init(): # Initialise display lcd_byte(0x33,LCD_CMD) # 110011 Initialise lcd_byte(0x32,LCD_CMD) # 110010 Initialise lcd_byte(0x06,LCD_CMD) # 000110 Cursor move direction lcd_byte(0x0C,LCD_CMD) # 001100 Display On,Cursor Off, Blink Off lcd_byte(0x28,LCD_CMD) # 101000 Data length, number of lines, font size lcd_byte(0x01,LCD_CMD) # 000001 Clear display time.sleep(E_DELAY) def lcd_byte(bits, mode): # Send byte to data pins # bits = the data # mode = 1 for data # 0 for command bits_high = mode | (bits & 0xF0) | LCD_BACKLIGHT bits_low = mode | ((bits<<4) & 0xF0) | LCD_BACKLIGHT # High bits bus.write_byte(I2C_ADDR, bits_high) lcd_toggle_enable(bits_high) # Low bits bus.write_byte(I2C_ADDR, bits_low) lcd_toggle_enable(bits_low) def lcd_toggle_enable(bits): # Toggle enable time.sleep(E_DELAY) bus.write_byte(I2C_ADDR, (bits | ENABLE)) time.sleep(E_PULSE) bus.write_byte(I2C_ADDR,(bits & ~ENABLE)) time.sleep(E_DELAY) def lcd_string(message,line): # Send string to display # If a message is longer than LCD_WIDTH (20) it will be cutted and then moves message = message.replace("\n"," ") if line == 0x80: li = 1 if line == 0xC0: li = 2 if line == 0x94: li = 3 if line == 0xD4: li = 4 global lastMSG global lstMSGi lcd_byte(line, LCD_CMD) if lastMSG[li] == message: if len(message) > LCD_WIDTH: for i in range(LCD_WIDTH): i2 = i + lstMSGi[li] lcd_byte(ord(message[i2]),LCD_CHR) test = lstMSGi[li] + LCD_WIDTH if test < len(message): lstMSGi[li] += 1 else: lstMSGi[li] = 0 else: message = message.ljust(LCD_WIDTH," ") for i in range(LCD_WIDTH): lcd_byte(ord(message[i]),LCD_CHR) else: lastMSG[li] = message lstMSGi[li] = 0 def GetMPC(command): from subprocess import check_output process = check_output(command.split()) return process def exit_handler(): global LCD_BACKLIGHT LCD_BACKLIGHT = 0x00 # Off lcd_byte(0x01, LCD_CMD) def main(): try: # Main program block # Initialise display lcd_init() while True: try: mpcstatus = GetMPC("mpc status") playing = mpcstatus.split("\n")[1].split(" ")[0] #Split to see if mpc is playing at the moment file = GetMPC("mpc -f %file% current") # Get the current title if playing == "[playing]": # If it is currently playing if file.startswith("http"): # if it is a http stream! name = GetMPC("mpc -f %name% current") titel = GetMPC("mpc -f %title% current") if len(name) > LCD_WIDTH: lcd_string(name[0:LCD_WIDTH],LCD_LINE_1) lcd_string(name[LCD_WIDTH:],LCD_LINE_2) else: lcd_string(name,LCD_LINE_1) lcd_string(titel,LCD_LINE_3) lcd_string("Playing",LCD_LINE_4) else: # if it is not a stream album = GetMPC("mpc -f %album% current" ) titel = GetMPC("mpc -f %title% current") track = GetMPC("mpc -f %track% current") time = GetMPC("mpc -f %time% current") artist = GetMPC("mpc -f %artist% current") lcd_string(""+titel,LCD_LINE_1) lcd_string(""+artist,LCD_LINE_2) lcd_string(""+album,LCD_LINE_3) lcd_string("Playing Track "+track,LCD_LINE_4) elif playing == "[paused]": # If is is paused if file.startswith("http"): # stream name = GetMPC("mpc -f %name% current") titel = GetMPC("mpc -f %title% current") if len(name) > LCD_WIDTH: lcd_string(name[0:LCD_WIDTH],LCD_LINE_1) lcd_string(name[LCD_WIDTH:],LCD_LINE_2) else: lcd_string(name,LCD_LINE_1) lcd_string(titel,LCD_LINE_3) lcd_string("Paused",LCD_LINE_4) else: #Not stream album = GetMPC("mpc -f %album% current") titel = GetMPC("mpc -f %title% current") track = GetMPC("mpc -f %track% current") time = GetMPC("mpc -f %time% current") artist = GetMPC("mpc -f %artist% current") lcd_string(""+titel,LCD_LINE_1) lcd_string(""+artist,LCD_LINE_2) lcd_string(""+album,LCD_LINE_3) lcd_string("Paused Track "+track,LCD_LINE_4) else: lcd_string("Hallo Sohnemann,",LCD_LINE_1) lcd_string("PhonieBox bereit! ",LCD_LINE_2) lcd_string(" ",LCD_LINE_3) lcd_string(date.today().strftime("%A %d. %B"),LCD_LINE_4) except: lcd_string("Hallo Sohnemann,",LCD_LINE_1) lcd_string("Phoniebox Zickt. ",LCD_LINE_2) lcd_string("Papa macht das schon",LCD_LINE_3) lcd_string("",LCD_LINE_4) pass time.sleep(10) except: LCD_BACKLIGHT = 0x00 # Off lcd_byte(0x01, LCD_CMD) finally: LCD_BACKLIGHT = 0x00 # Off lcd_byte(0x01, LCD_CMD) atexit.register(exit_handler) if __name__ == '__main__': try: main() except KeyboardInterrupt: LCD_BACKLIGHT = 0x00 # Off lcd_byte(0x01, LCD_CMD) pass finally: LCD_BACKLIGHT = 0x00 # Off lcd_byte(0x01, LCD_CMD)