12-08-2018, 03:49 AM
Hello. I've finally just updated my player from the beta version (lol) and installed this awesome LCD script. I am using a parallel interface with a 20x4 LCD. The only thing is, I used to have a backlight control and I don't see this implemented anywhere in your script. Is there any way to do this? For me it was, backlight on when playing or paused, and off when stopped..
I guess this might be a bit more complicated with the Weather and other options you have.
Here is the code I was using before:
I guess this might be a bit more complicated with the Weather and other options you have.
Here is the code I was using before:
Code:
#!/usr/bin/python
# -*- coding: utf-8 -*-
#--------------------------------------
#
# The LCD Driver portion of this code
# created by:
# ___ ___ _ ____
# / _ \/ _ \(_) __/__ __ __
# / , _/ ___/ /\ \/ _ \/ // /
# /_/|_/_/ /_/___/ .__/\_, /
# /_/ /___/
#
# lcd_16x2.py
# 20x4 LCD Test Script with
# backlight control and text justification
#
# Author : Matt Hawkins
# Date : 06/04/2015
#
# https://www.raspberrypi-spy.co.uk/
#--------------------------------------
#
# The Moode audio portion of the code
# created by:
#
# Author : Bryce Jeannotte
# Date : 08/31/2017
#
#--------------------------------------
# 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
#import
import os
import RPi.GPIO as GPIO
import time
# Define GPIO to LCD mapping
# Change this table to match the BGM GPIO
# numbers to your display wiring
LCD_RS = 7
LCD_E = 8
LCD_D4 = 25
LCD_D5 = 24
LCD_D6 = 23
LCD_D7 = 14
LED_ON = 15
# Define some device constants
LCD_WIDTH = 20 # Maximum characters per line
LCD_CHR = True
LCD_CMD = False
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
# Timing constants
E_PULSE = 0.0005
E_DELAY = 0.0005
# Scrolling constants
ST_DELAY = 1.5 # Delay before scrolling first line
SF_DELAY = .5 # Delay before scrolling second and third line
SC_DELAY = .25 # Delay between scrolling characters
SC_COUNT = 2 # Number of characters to scroll at one time
SC_REPEAT = True # Continous scrolling switch
SR_DELAY = 10 # Delay before repeating the scrolling
VD_DISPLAY = True # Volume display switch
VD_DELAY = 2.5 # Number of seconds to display volume change
# Cool our jets
time.sleep(15)
# currentsont.txt timestamp
csts = os.stat("/var/local/www/currentsong.txt").st_mtime
ivol = 0
def main():
GPIO.setmode(GPIO.BCM) # Use BCM GPIO numbers
GPIO.setup(LCD_E, GPIO.OUT) # E
GPIO.setup(LCD_RS, GPIO.OUT) # RS
GPIO.setup(LCD_D4, GPIO.OUT) # DB4
GPIO.setup(LCD_D5, GPIO.OUT) # DB5
GPIO.setup(LCD_D6, GPIO.OUT) # DB6
GPIO.setup(LCD_D7, GPIO.OUT) # DB7
GPIO.setup(LED_ON, GPIO.OUT) # Backlight enable
# Initialise display
splash_screen()
lcd_backlight(False)
while True:
global csts, ivol
# Has currentsong.txt changed?
if (csts <> os.stat("/var/local/www/currentsong.txt").st_mtime):
csts = os.stat("/var/local/www/currentsong.txt").st_mtime
try:
# Read the currentsong.txt file and format the diplay lines
with open("/var/local/www/currentsong.txt","r") as currentsong:
lines = currentsong.readlines()
a,artist = lines[1].split("=")
a,album = lines[2].split("=")
a,title = lines[3].split("=")
a,year = lines[6].split("=")
a,encoded = lines[8].split("=")
a,bitrate = lines[9].split("=")
a,volume = lines[10].split("=")
a,mute = lines[11].split("=")
a,status = lines[12].split("=")
# Remove white space
artist = artist.strip()
album = album.strip()
title = title.strip()
year = year.strip()
encoded = encoded.strip()
bitrate = bitrate.strip()
volume = volume.strip()
mute = mute.strip()
status = status.strip()
# Remove accented characters for LCD display
artist = remove_accent(artist)
album = remove_accent(album)
title = remove_accent(title)
# Flip bit depth and sample rate
if ("/" in encoded):
encoded_only = encoded.split(" ",1)
bitdepth,samplerate = encoded_only[0].split("/")
encoded = "%s-%s" % (samplerate, bitdepth)
# Build the display lines
if status == "stop":
line1 = " moOde Audio Player"
line2 = "We are done for now!"
line3 = ""
line4 = " <== Stopped ==>"
lcd_backlight(False)
else:
if artist == "Radio station":
lcd_backlight(True)
line1 = artist
line2 = album
if (title[:5] == "http:"):
line3 = "Internet stream"
else:
line3 = title
else:
lcd_backlight(True)
line1 = artist
line2 = title
line3 = album
if status == "pause":
line4 = " <== Paused ==>"
lcd_backlight(False)
elif VD_DISPLAY:
if mute == "1":
ivol = -1
line4 = " <== Muted ==>"
lcd_init()
else:
if ivol == volume:
line4 = "%s | %s" % (encoded, bitrate)
else:
ivol = volume
line4 = "%s %s%s" % (" <== Volume", volume, "% ==>")
else:
line4 = "%s | %s" % (encoded, bitrate)
# Send the lines to the display
lcd_string(line1,LCD_LINE_1,1)
lcd_string(line2,LCD_LINE_2,1)
lcd_string(line3,LCD_LINE_3,1)
lcd_string(line4,LCD_LINE_4,1)
# Close currentsong.txt
currentsong.close()
# Check if we need to display volume change
if ("Volume" in line4 and VD_DISPLAY):
sleep_for(VD_DELAY)
csts = -1
# Check if we need to scroll
if (status == "play" and SC_REPEAT):
rc = 0
while rc>= 0:
rc = check_scrolling(line1, line2, line3, csts)
elif (status == "play"):
check_scrolling(line1, line2, line3, csts)
except Exception:
pass
else:
sleep_for(.3)
def splash_screen():
# Splash screen text
lcd_init()
line1 = "Welcome to the"
line2 = "moOde Audio Player"
line3 = "--------------------"
line4 = "Enjoy the Music!"
# Display the splash screen
lcd_string(line1,LCD_LINE_1,2)
lcd_string(line2,LCD_LINE_2,2)
lcd_string(line3,LCD_LINE_3,2)
lcd_string(line4,LCD_LINE_4,2)
def remove_accent(text):
# Remove Accents
text = text.replace("à", "a")
text = text.replace("á", "a")
text = text.replace("â", "a")
text = text.replace("ã", "a")
text = text.replace("ä", "a")
text = text.replace("è", "e")
text = text.replace("é", "e")
text = text.replace("ê", "e")
text = text.replace("ë", "e")
text = text.replace("ì", "i")
text = text.replace("í", "i")
text = text.replace("î", "i")
text = text.replace("ï", "i")
text = text.replace("ñ", "n")
text = text.replace("ò", "o")
text = text.replace("ó", "o")
text = text.replace("ô", "o")
text = text.replace("õ", "o")
text = text.replace("ö", "o")
text = text.replace("ù", "u")
text = text.replace("ú", "u")
text = text.replace("û", "u")
text = text.replace("ü", "u")
text = text.replace("ý", "y")
text = text.replace("ÿ", "y")
text = text.replace("ç", "c")
return text
def check_scrolling(line1, line2, line3, csts):
# Check if display line needs to be scrolled
S_DELAY = True
if (len(line1) > LCD_WIDTH):
S_DELAY = False
time.sleep(ST_DELAY)
# Scroll Line 1
rc = scroll_line(line1, LCD_LINE_1, csts)
if rc < 0:
return rc
if (len(line2) > LCD_WIDTH):
if S_DELAY:
S_DELAY = False
time.sleep(ST_DELAY)
else:
time.sleep(SF_DELAY)
# Scroll Line 2
rc = scroll_line(line2, LCD_LINE_2, csts)
if rc < 0:
return rc
if (len(line3) > LCD_WIDTH):
if S_DELAY:
S_DELAY = False
time.sleep(ST_DELAY)
else:
time.sleep(SF_DELAY)
# Scroll Line 3
rc = scroll_line(line3, LCD_LINE_3, csts)
if rc < 0:
return rc
if (SC_REPEAT and not S_DELAY):
rc = sleep_for(SR_DELAY)
return rc
else:
rc = sleep_for(.3)
return rc
def scroll_line(text, line, csts):
# Scroll display line
if (len(text) % SC_COUNT == 0):
line_length = len(text) + 1
else:
line_length = len(text) + SC_COUNT
for num in xrange(SC_COUNT,line_length,SC_COUNT):
if (csts <> os.stat("/var/local/www/currentsong.txt").st_mtime):
return -1
scrollpart = text[num:num + 20]
lcd_string(scrollpart,line,1)
if scrollpart == "":
time.sleep(SF_DELAY)
else:
time.sleep(SC_DELAY)
lcd_string(text,line,1)
return 0
def sleep_for(count):
# Sleep for count seconds and check for exit every .1 seconds
count = int((count * 10)//1)
for num in xrange(1,count,1):
if (csts <> os.stat("/var/local/www/currentsong.txt").st_mtime):
return -1
else:
time.sleep(.1)
return 0
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 = data
# mode = True for character
# False for command
GPIO.output(LCD_RS, mode) # RS
# High bits
GPIO.output(LCD_D4, False)
GPIO.output(LCD_D5, False)
GPIO.output(LCD_D6, False)
GPIO.output(LCD_D7, False)
if bits&0x10==0x10:
GPIO.output(LCD_D4, True)
if bits&0x20==0x20:
GPIO.output(LCD_D5, True)
if bits&0x40==0x40:
GPIO.output(LCD_D6, True)
if bits&0x80==0x80:
GPIO.output(LCD_D7, True)
# Toggle 'Enable' pin
lcd_toggle_enable()
# Low bits
GPIO.output(LCD_D4, False)
GPIO.output(LCD_D5, False)
GPIO.output(LCD_D6, False)
GPIO.output(LCD_D7, False)
if bits&0x01==0x01:
GPIO.output(LCD_D4, True)
if bits&0x02==0x02:
GPIO.output(LCD_D5, True)
if bits&0x04==0x04:
GPIO.output(LCD_D6, True)
if bits&0x08==0x08:
GPIO.output(LCD_D7, True)
# Toggle 'Enable' pin
lcd_toggle_enable()
def lcd_toggle_enable():
# Toggle enable
time.sleep(E_DELAY)
GPIO.output(LCD_E, True)
time.sleep(E_PULSE)
GPIO.output(LCD_E, False)
time.sleep(E_DELAY)
def lcd_string(message,line,style):
# Send string to display
# style=1 Left justified
# style=2 Centred
# style=3 Right justified
if style==1:
message = message.ljust(LCD_WIDTH," ")
elif style==2:
message = message.center(LCD_WIDTH," ")
elif style==3:
message = message.rjust(LCD_WIDTH," ")
lcd_byte(line, LCD_CMD)
for i in range(LCD_WIDTH):
lcd_byte(ord(message[i]),LCD_CHR)
def lcd_backlight(flag):
# Toggle backlight on-off-on
GPIO.output(LED_ON, flag)
if __name__ == '__main__':
try:
main()
except KeyboardInterrupt:
pass
finally:
lcd_init()
GPIO.cleanup()