first pass at handling display lock/unlock

SoundslabDisplay.py

@@ -20,6 +20,7 @@ class SoundslabDisplay:
                 backlight=13,
                 spi_speed_hz=self.spi_speed_mhz * 1000 * 1000
         )
+        self.displayOn = True
         self.current_background = Image.new("RGBA", self.screen_size, (0, 0, 255, 255))
         self.current_overlay    = Image.new("RGBA", self.screen_size, (0, 0, 0, 0))
         self.current_menu       = Image.new("RGBA", self.screen_size, (0, 0, 0, 0))
@@ -34,6 +35,22 @@ class SoundslabDisplay:
         # track currently playing song's art path to eliminate unnecessary reloads of the same image file
         self.current_art_path = None
 
+    def _displayOff(self):
+        self.st7789.set_backlight(0) # turn off the backlight
+        self.st7789.command(0x28)    # turn off the display itself
+        self.displayOn = False
+
+    def _displayOn(self):
+        self.st7789.command(0x29)    # turn on the display itself
+        self.st7789.set_backlight(1) # turn on the backlight
+        self.displayOn = True
+
+    def toggleDisplayOnOff(self):
+        if self.displayOn:
+            self._displayOff()
+        else:
+            self._displayOn()
+
     def getBatteryState(self):
         bus = smbus.SMBus(1)
 

SoundslabInput.py

@@ -9,6 +9,9 @@ from math import floor
 player_client = musicpd.MPDClient()
 player_client.connect()
 
+# initialize connection to display
+display = SoundslabDisplay(player_client)
+
 # The buttons on Pirate Audio are connected to pins 5, 6, 16 and 24
 # Boards prior to 23 January 2020 used 5, 6, 16 and 20 
 # try changing 24 to 20 if your Y button doesn't work.
@@ -94,7 +97,7 @@ def RT():
 
 def SELECT():
     # display lock/unlock
-    pass
+    display.toggleDisplayOnOff()
 
 # This is a dictionary of the combination of pins and labels
 LABELLED_BUTTONS = {
@@ -123,9 +126,6 @@ def handle_button(pin):
 for pin in BUTTONS:
     GPIO.add_event_detect(pin, GPIO.FALLING, handle_button, bouncetime=100)
 
-# initialize the display
-display = SoundslabDisplay(player_client)
-
 while True:
     # test album art
     display.updateAlbumArt()