update raspi script

README.md

@@ -4,7 +4,7 @@
  * Plug USB into Computer
  * booting the Raspberry takes approximately ?? seconds. the ?? led will light up when ready
  * start freeze.exe from the (now attached) USB-Drive
- * press WindowsKey+Y or PRINTSCREEN to take a screenshot
+ * press WindowsKey+Y or Alt+PRINTSCREEN to take a screenshot
  * simply unplug after use
 
 # Initial setup
@@ -16,8 +16,8 @@
  * Raspberry Pi Zero or Zero W or Model A (Model B/2B/3 not supported!)
 
 ## Hardware
-                     D D (Status LEDs)
-     _______________||||___
+           LED     LED SW
+     _______|_______|_|____
     | :::::::::::::::::::: |
     |                      |
     |_HDMI________USB__PWR_|
@@ -49,6 +49,8 @@ apt clean
 
 echo "dtoverlay=dwc2" >> /boot/config.txt
 
+echo "dtoverlay=gpio-poweroff,gpiopin=5,active_low" >> /boot/config.txt
+
 echo "libcomposite" >> /etc/modules
 
 apt purge plymouth

raspberry-environment/display.py

@@ -13,6 +13,10 @@ import time
 import subprocess
 import glob
 
+pin_led_ready=27
+pin_led_busy=5
+pin_switch=13
+
 try:
   import RPi.GPIO as GPIO
 except RuntimeError:
@@ -125,15 +129,17 @@ def os_echo_bin(filename, string):
 def send_keypress():
   with open('/dev/hidg0', 'wb') as f:
     f.write(bytearray(b'\x00\x00\x04\x00\x00\x00\x00\x00')) #press the A-button
+    time.sleep(0.05)
     f.write(bytearray(b'\x00\x00\x00\x00\x00\x00\x00\x00'))  #release all keys
 
 
 if __name__ == '__main__':
   GPIO.setmode(GPIO.BCM)
-  GPIO.setup(18, GPIO.OUT)
-  GPIO.setup(23, GPIO.OUT)
-  GPIO.output(18, GPIO.LOW)
-  GPIO.output(23, GPIO.LOW)
+  GPIO.setup(pin_led_ready, GPIO.OUT)
+  GPIO.setup(pin_led_busy, GPIO.OUT)
+  GPIO.setup(pin_switch, GPIO.IN, pull_up_down=GPIO.PUD_UP)
+  GPIO.output(pin_led_ready, GPIO.LOW)
+  GPIO.output(pin_led_busy, GPIO.LOW)
 
   g="/sys/kernel/config/usb_gadget/freezer/"
 
@@ -219,8 +225,8 @@ if __name__ == '__main__':
 #      if paths:
 #        for path in paths:
 #          print('  {0}'.format(path))
-      GPIO.output(18, GPIO.HIGH)
-      GPIO.output(23, GPIO.HIGH)
+      GPIO.output(pin_led_ready, GPIO.HIGH)
+      GPIO.output(pin_led_busy, GPIO.HIGH)
       print('file changed')
       subprocess.run(['killall', 'fim'], shell=False, check=False)
       subprocess.run(['umount', '/mnt'], shell=False, check=False)
@@ -234,14 +240,18 @@ if __name__ == '__main__':
         latest_file = max(list_of_files, key=os.path.getctime)
         print(latest_file)
         subprocess.run('fim -d /dev/fb0 -T 1 --autozoom --quiet "'+latest_file+'" &', shell=True)
-      GPIO.output(23, GPIO.LOW)
+      GPIO.output(pin_led_busy, GPIO.LOW)
+
+    def callback_switch(channel):
+      send_keypress()
 
 
+    GPIO.add_event_detect(pin_switch, GPIO.FALLING, callback=callback_switch, bouncetime=250)
     watch_delay_call('/tmp/usbdisk.img', callback, 0.5, True, pyinotify.IN_MODIFY)
 
   finally:
-    GPIO.output(23, GPIO.LOW)
-    GPIO.output(18, GPIO.LOW)
+    GPIO.output(pin_led_busy, GPIO.LOW)
+    GPIO.output(pin_led_ready, GPIO.LOW)
     subprocess.run(['killall', 'fim'], shell=False, check=False)
     subprocess.run(['umount', '/mnt'], shell=False, check=False)
     os_echo(g+"UDC", "")