Salve a tutti, sono nuovo del forum. Sto assemblando un piccolo media player con raspberry pi e volumio e dovrei utilizzare un piccolo script per far apparire su un lcd i dettagli sui brani che sto ascoltando

import Image
import ImageDraw
import ImageFont
import time
import subprocess
import os
import glob
import socket
import Adafruit ILI9341 as TFT
import Adafruit_GPIO as GPIO
import Adafruit_GPIO.SPI as SPI
import gc
import mpd
client = mpd.MPDClient(use_unicode=True)
client.timeout = 10
client.connect("localhost", 6600)

#setup to monitor pin for shutdown on power stich off
gpio = GPIO.get_platform_gpio()

gpio.setup(20, GPIO.IN, pull_up_down=GPIO.PUD_DOWN) # monitor power switch

gpio.setup(21, GPIO.OUT) # Take control of Keep Alive signal to relay board
gpio.setup(16, GPIO.OUT) # Takecontrol of Power LED
gpio.setup(18, GPIO.OUT) # Take control of LCD Backlight

gpio.output(21, True) # Turn on Keep Alive
gpio.output(16, True) # Turn on Power LED
gpio.output(18, True) # Turn on LCD backlight


# Raspberry Pi pin configuration for screen
DC = 18
RST = 23
SPI_PORT = 0
SPI_DEVICE = 0

# Create TFT LCD display class.
disp = TFT.ILI9341(DC, rst=RST, spi=SPI.SpiDev(SPI_PORT, SPI_DEVICE, max_speed_hz=64000000))

# Initialize display.
disp.begin()

# Clear the Display
disp.clear((0, 0, 0))   #DON'T DO THIS OFTEN, IT LEAKS MEMORY IF REPEATED FREQUENTLY

# Get a PIL Draw object to start drawing on the display buffer.
draw = disp.draw()

# load a TTF font
# I chose fixed width for now, to make it easier to center things

font = ImageFont.truetype('/home/pi/display/unispace.ttf', 20)
smallfont = ImageFont.truetype('/home/pi/display/unispace.ttf', 14)
bigfont = ImageFont.truetype('/home/pi/display/unispace.ttf', 60)

orig_time = time.time() # Initialise timer for track timer


# Try to connect to gmail, then note which IP address resolves to the internet to identify the correct
# network interface to print on the screen in idle mode
s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
s.connect(("gmail.com",80))
ipaddress=(s.getsockname()0)
s.close()

# Return CPU temperature as a character string                                     
def getCPUtemperature():
    res = os.popen('vcgencmd measure_temp').readline()
    return(res.replace("temp=","").replace("'C\n",""))
   

#The screen is usually setup portrait, so ghere i used some adafruit code to draw text at 90 degrees:

def draw_rotated_text(image, text, position, angle, font, fill=(255,255,255)):
   # Get rendered font width and height.
   draw = ImageDraw.Draw(image)
   width, height = draw.textsize(text, font=font)
   # Create a new image with transparent background to store the text.
   textimage = Image.new('RGBA', (width, height), (0,0,0,0))
   # Render the text.
   textdraw = ImageDraw.Draw(textimage)
   textdraw.text((0,0), text, font=font, fill=fill)
   # Rotate the text image.
   rotated = textimage.rotate(angle, expand=1)
   # Paste the text into the image, using it as a mask for transparency.
   image.paste(rotated, position)


#Initial MPC queries. !!!"Always use try/except !!!!! otherwise the program crashes out when one is blank!
   
try:
        artist = client.currentsong()['artist']
except:
        artist = "No Artist"
       
try:
        title = client.currentsong()['title']
except:
        title = "No Title"

try:
        album = client.currentsong()['album']
except:
        album = "No Album"
   
start_time = time.time()


# initial setup of variables and lines
oldtitle = title
artist2 = artist[28:56].center(27)
artist = artist[0:28].center(27)
title2 = title[28:56].center(27)
title = title[0:28].center(27)
album2  = album[28:56].center(34)
album = album[0:28].center(34)


#inital draw of screen

disp.clear((0, 0, 0))
draw_rotated_text(disp.buffer, artist, (20, 0), 90, font, fill=(255,255,255))
draw_rotated_text(disp.buffer, artist2, (40, 0), 90, font, fill=(255,255,255))       
draw_rotated_text(disp.buffer, title, (70, 0), 90, font, fill=(255,255,255))
draw_rotated_text(disp.buffer, title2, (90, 0), 90, font, fill=(255,255,255))
draw_rotated_text(disp.buffer, album, (150, 0), 90, smallfont, fill=(255,255,255))
draw_rotated_text(disp.buffer, album2, (180, 0), 90,smallfont, fill=(255,255,255))

oldstate="Random nonzero"

while(True):

        if ( gpio.input(20) == False ):    ##I have this pin wired to the power switch on the front of the case. If the input goes low, the pi shuts down! Remove this if you don't want it to happen
                print "shutdown"
                disp.clear((0, 0, 0))
                draw_rotated_text(disp.buffer, "Shutdown", (70, 10), 90, bigfont, fill=(255,255,255))
                disp.display()
                time.sleep(5)
                os.system('sudo shutdown -h now')
               
        try:
                oldstate=state
                state = client.status()['state']

        except:
                state = "fail"
               
        if (state != oldstate): disp.clear((0, 0, 0))
        ## only clear when we have to, disp.clear has a memory leak!!!

        if (state != "play") and (state != "pause"):  # If device idle, show current time/date, IP and CPU temp


                draw_rotated_text(disp.buffer, ipaddress, (20, 10), 90, smallfont, fill=(255,255,255))
                draw_rotated_text(disp.buffer, getCPUtemperature(), (20, 280), 90, smallfont, fill=(255,255,255))
               
                localtime = time.asctime( time.localtime(time.time()) )
                draw_rotated_text(disp.buffer, localtime[0:10], (70, 10), 90, font, fill=(255,255,255))
                draw_rotated_text(disp.buffer, localtime[11:19], (90, 10), 90, bigfont, fill=(255,255,255))

                disp.display()
                time.sleep(0.1)    # YOu can remove this to make display update quicker, but it becomes even more of a CPU hog
                oldtitle = "Random Nonsense placeholder"
                print state    # just for debugging

        else:   # If Playing or Paused
               
       
                print state   ## just for debugging
                draw_time = time.time()  ## also debug
               
                try:
                        newtitle = client.currentsong()['title']
                except:
                        newtitle = "failed to get title"

                if (newtitle == oldtitle):     # Mark time on track change

                        seconds = time.time() - start_time
                        m, s = divmod(seconds, 60)
                        h, m = divmod(m, 60)     
                       
                        draw_rotated_text(disp.buffer,"%d:%02d:%02d" % (h, m, s) , (195, 5), 90, font, fill=(255,255,255))
                else:
                        start_time = time.time()
                               
                        try:                            # ALWAYS TRY /EXCEPT ON MPC CALLS
                                artist = client.currentsong()['artist']
                        except:
                                artist = "No Artist"
                               
                        try:
                                title = client.currentsong()['title']
                        except:
                                title = "No Title"

                        try:
                                album = client.currentsong()['album']
                        except:
                                album = "No Album"


                         #Format display strings
                        oldtitle = title             
                        artist2 = artist[28:56].center(27)
                        artist = artist[0:28].center(27)
                        title2 = title[28:56].center(27)
                        title = title[0:28].center(27)
                        album2  = album[28:56].center(34)
                        album = album[0:28].center(34)

                        disp.clear((0, 0, 0))
                        draw_rotated_text(disp.buffer, artist, (20, 0), 90, font, fill=(255,255,255))
                        draw_rotated_text(disp.buffer, artist2, (40, 0), 90, font, fill=(255,255,255))       
                        draw_rotated_text(disp.buffer, title, (70, 0), 90, font, fill=(255,255,255))
                        draw_rotated_text(disp.buffer, title2, (90, 0), 90, font, fill=(255,255,255))
                        draw_rotated_text(disp.buffer, album, (150, 0), 90, smallfont, fill=(255,255,255))
                        draw_rotated_text(disp.buffer, album2, (180, 0), 90,smallfont, fill=(255,255,255))



                               
                disp.display()
                time.sleep(0.1)   # Can reduce this delay for snappyer display, but it will hog much more CPU for little benefit.

è stato gentilmente messo a disposizione dal suo creatore https://volumio.org/forum/320x240-tft-control-sabre-es9023-dac-build-t2610-10.html#p19735 che ha avvisato di "commentare" lo script per prevenire lo spegnimento del raspberry come previsto dal codice. Potrei chiedervi in che modo potrei commentarlo per prevenire tutto ciò?
Grazie


--- Ultima modifica di Filippo Filippo in data 2016-07-12 19:45:35 ---

direi che puoi provare a rimuovere il blocco che segue:

Filippo Filippo said @ 2016-07-12 19:44:58:

        if ( gpio.input(20) == False ):    ##I have this pin wired to the power switch on the front of the case. If the input goes low, the pi shuts down! Remove this if you don't want it to happen
                print "shutdown"
                disp.clear((0, 0, 0))
                draw_rotated_text(disp.buffer, "Shutdown", (70, 10), 90, bigfont, fill=(255,255,255))
                disp.display()
                time.sleep(5)
                os.system('sudo shutdown -h now') 

Facendo così toglierei la parte relativa allo spegnimento, nel senso eliminerei il problema senza risolverlo. Mi servirebbe capire cosa intende col commento allo script il suo creatore, da quello che ho capito (e 9 su 10 sbaglio) lo script arrivato a compimento (fine dei comandi) manda il segnale di arresto, il commento dovrebbe servire a lasciarlo in esecuzione in attesa di ricevere il comando tramite GPIO per spegnersi volontariamente. Ho capito male ciò che volevi dirmi o intendevi per risolvere proprio di togliere la possibilità al codice di spegnere?