ulab example to invert display

examples/ov2640_displayio_kaluga1_3_ili9341_ulab.py

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+# SPDX-FileCopyrightText: 2017 Scott Shawcroft, written for Adafruit Industries
+# SPDX-FileCopyrightText: Copyright (c) 2021 Jeff Epler for Adafruit Industries
+#
+# SPDX-License-Identifier: Unlicense
+
+"""
+The Kaluga development kit comes in two versions (v1.2 and v1.3); this demo is
+tested on v1.3.  It probably won't work on v1.2 without modification.
+
+The v1.3 development kit's LCD can have one of two chips, the ili9341 or
+st7789.  Furthermore, there are at least 2 ILI9341 variants, one of which needs
+rotation=90!  This demo is for the ili9341.  If the display is garbled, try adding
+rotation=90, or try modifying it to use ST7799.
+
+The camera included with the Kaluga development kit is the incompatible OV2640,
+it won't work.
+
+The audio board must be mounted between the Kaluga and the LCD, it provides the
+I2C pull-ups(!)
+"""
+
+import board
+import busio
+import displayio
+from adafruit_ili9341 import ILI9341
+import adafruit_ov2640
+import ulab.numpy as np
+
+# Pylint is unable to see that the "size" property of OV2640_GrandCentral exists
+# pylint: disable=attribute-defined-outside-init
+
+# Release any resources currently in use for the displays
+displayio.release_displays()
+
+spi = busio.SPI(MOSI=board.LCD_MOSI, clock=board.LCD_CLK)
+display_bus = displayio.FourWire(
+    spi, command=board.LCD_D_C, chip_select=board.LCD_CS, reset=board.LCD_RST
+)
+display = ILI9341(display_bus, width=320, height=240, rotation=90)
+
+bus = busio.I2C(scl=board.CAMERA_SIOC, sda=board.CAMERA_SIOD)
+cam = adafruit_ov2640.OV2640(
+    bus,
+    data_pins=board.CAMERA_DATA,
+    clock=board.CAMERA_PCLK,
+    vsync=board.CAMERA_VSYNC,
+    href=board.CAMERA_HREF,
+    mclk=board.CAMERA_XCLK,
+    mclk_frequency=20_000_000,
+    size=adafruit_ov2640.OV2640_SIZE_QVGA,
+)
+
+cam.flip_x = False
+cam.flip_y = True
+pid = cam.product_id
+ver = cam.product_version
+print(f"Detected pid={pid:x} ver={ver:x}")
+cam.test_pattern = True
+
+g = displayio.Group(scale=1)
+bitmap = displayio.Bitmap(320, 240, 65536)
+arr = np.frombuffer(bitmap, dtype=np.uint16)
+tg = displayio.TileGrid(
+    bitmap,
+    pixel_shader=displayio.ColorConverter(
+        input_colorspace=displayio.Colorspace.RGB565_SWAPPED
+    ),
+)
+g.append(tg)
+display.show(g)
+
+display.auto_refresh = False
+while True:
+    cam.capture(bitmap)
+    arr[:]= ~arr        # Invert every pixel in the bitmap, via the array
+    bitmap.dirty()
+    display.refresh(minimum_frames_per_second=0)
+
+cam.deinit()