X-Git-Url: https://git.ayoreis.com/hackapet/Adafruit_Blinka_Displayio.git/blobdiff_plain/a94203addedf0b7d4e5885848117b10bf6fa9fe1..HEAD:/displayio/__init__.py

diff --git a/displayio/__init__.py b/displayio/__init__.py
index a908e1a..e42d24a 100644
--- a/displayio/__init__.py
+++ b/displayio/__init__.py
@@ -16,33 +16,89 @@ displayio for Blinka
 * Author(s): Melissa LeBlanc-Williams
 
 """
-
+import threading
+import time
 from typing import Union
-from ._fourwire import FourWire
-from ._i2cdisplay import I2CDisplay
+
 from ._bitmap import Bitmap
 from ._colorspace import Colorspace
 from ._colorconverter import ColorConverter
-from ._display import Display
-from ._epaperdisplay import EPaperDisplay
 from ._group import Group
 from ._ondiskbitmap import OnDiskBitmap
 from ._palette import Palette
-from ._shape import Shape
 from ._tilegrid import TileGrid
-from ._display import displays
-from ._displaybus import _DisplayBus
+from ._constants import CIRCUITPY_DISPLAY_LIMIT
+
 
 __version__ = "0.0.0+auto.0"
 __repo__ = "https://github.com/adafruit/Adafruit_Blinka_displayio.git"
 
 
+displays = []
+display_buses = []
+
+
+def _background(stop_event):
+    """Main thread function to loop through all displays and update them"""
+    while not stop_event.is_set():
+        for display in displays:
+            display._background()  # pylint: disable=protected-access
+
+        # relax system when _background does nothing
+        # and we are in a while True loop consuming lots of CPU
+        time.sleep(0.0)
+
+
 def release_displays() -> None:
     """Releases any actively used displays so their busses and pins can be used again.
 
     Use this once in your code.py if you initialize a display. Place it right before the
     initialization so the display is active as long as possible.
     """
-    for _disp in displays:
-        _disp._release()  # pylint: disable=protected-access
+    for display in displays:
+        display._release()  # pylint: disable=protected-access
     displays.clear()
+
+    for display_bus in display_buses:
+        display_bus.deinit()
+    display_buses.clear()
+
+
+def allocate_display(
+    new_display: Union["busdisplay.BusDisplay", "epaperdisplay.EPaperDisplay"]
+) -> None:
+    """Add a display to the displays pool and return the new display"""
+    if len(displays) >= CIRCUITPY_DISPLAY_LIMIT:
+        raise RuntimeError("Too many displays")
+    displays.append(new_display)
+
+
+def allocate_display_bus(new_display_bus: "busdisplay._displaybus._DisplayBus") -> None:
+    """Add a display bus to the display_buses pool and return the new display bus"""
+    if len(display_buses) >= CIRCUITPY_DISPLAY_LIMIT:
+        raise RuntimeError(
+            "Too many display busses; forgot displayio.release_displays() ?"
+        )
+    display_buses.append(new_display_bus)
+
+
+background_thread_stop_event = threading.Event()
+background_thread = threading.Thread(
+    target=_background, args=(background_thread_stop_event,), daemon=True
+)
+
+
+# Start the background thread
+def _start_background():
+    if not background_thread.is_alive():
+        background_thread.start()
+
+
+def _stop_background():
+    if background_thread.is_alive():
+        background_thread_stop_event.set()
+        # Stop the thread
+        background_thread.join()
+
+
+_start_background()