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GPIO is now enabled on demand

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This commit is contained in:
Balthasar Reuter
2015-05-28 23:19:41 +02:00
parent 65764da1f7
commit 2d4d26617f
1 changed files with 24 additions and 13 deletions
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37
photobooth.py
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@@ -10,7 +10,12 @@ from sys import exit
from time import sleep from time import sleep
import pygame import pygame
#import RPi.GPIO as GPIO
try:
import RPi.GPIO as GPIO
gpio_enabled = True
except ImportError:
gpio_enabled = False
##################### #####################
### Configuration ### ### Configuration ###
@@ -79,7 +84,6 @@ class GUI_PyGame:
pygame.display.set_caption(name) pygame.display.set_caption(name)
# Hide mouse cursor # Hide mouse cursor
pygame.mouse.set_cursor(*pygame.cursors.load_xbm('transparent.xbm','transparent.msk')) pygame.mouse.set_cursor(*pygame.cursors.load_xbm('transparent.xbm','transparent.msk'))
#pygame.mouse.set_visible(False)
# Store screen and size # Store screen and size
self.size = size self.size = size
self.screen = pygame.display.set_mode(self.size, pygame.FULLSCREEN) self.screen = pygame.display.set_mode(self.size, pygame.FULLSCREEN)
@@ -187,6 +191,7 @@ class Camera:
################# #################
def take_picture(): def take_picture():
"""Implements the picture taking routine"""
display.clear() display.clear()
# Show pose message # Show pose message
display.show_picture(image_pose) display.show_picture(image_pose)
@@ -243,23 +248,29 @@ def handle_exception(msg):
sleep(3) sleep(3)
def setup_gpio(): def setup_gpio():
# Display initial information """Enables GPIO in- and output and registers event handles"""
print "Your Raspberry Pi is board revision " + str(GPIO.RPI_INFO['P1_REVISION']) if gpio_enabled:
print "RPi.GPIO version is " + str(GPIO.VERSION) # Display initial information
# Choose BCM numbering system print("Your Raspberry Pi is board revision " + str(GPIO.RPI_INFO['P1_REVISION']))
GPIO.setmode(GPIO.BCM) print("RPi.GPIO version is " + str(GPIO.VERSION))
# Setup the trigger channel as input and listen for events # Choose BCM numbering system
GPIO.setup(gpio_trigger_channel, GPIO.IN, pull_up_down=GPIO.PUD_UP) GPIO.setmode(GPIO.BCM)
GPIO.add_event_detect(gpio_trigger_channel, GPIO.RISING, # Setup the trigger channel as input and listen for events
callback=handle_gpio_event, bouncetime=200) GPIO.setup(gpio_trigger_channel, GPIO.IN, pull_up_down=GPIO.PUD_UP)
GPIO.add_event_detect(gpio_trigger_channel, GPIO.RISING,
callback=handle_gpio_event, bouncetime=200)
else:
print("Warning: RPi.GPIO could not be loaded. GPIO disabled.")
def teardown(exit_code=0): def teardown(exit_code=0):
display.teardown() display.teardown()
#GPIO.cleanup() if gpio_enabled:
GPIO.cleanup()
exit(exit_code) exit(exit_code)
def main(): def main():
#setup_gpio() setup_gpio()
while True: while True:
try: try:
display.mainloop(image_idle) display.mainloop(image_idle)