Add RGB666 Paint Demo

docs/examples.rst

@@ -10,3 +10,16 @@ Ensure your device works with these simple tests.
 .. literalinclude:: ../examples/focaltouch_paint_simpletest.py
     :caption: examples/focaltouch_paint_simpletest.py
     :linenos:
+
+.. literalinclude:: ../examples/focaltouch_print_touches_with_irq.py
+    :caption: examples/focaltouch_print_touches_with_irq.py
+    :linenos:
+
+Demos
+-----
+
+These demos are a bit more complex.
+
+.. literalinclude:: ../examples/focaltouch_paint_rgb666.py
+    :caption: examples/focaltouch_paint_rgb666.py
+    :linenos:

examples/focaltouch_paint_rgb666.py

@@ -0,0 +1,114 @@
+# SPDX-FileCopyrightText: 2021 ladyada for Adafruit Industries
+# SPDX-License-Identifier: MIT
+"""
+Simple painting demo that draws on the Adafruit Qualia ESP32-S3 RGB666
+with the 4.0" square display and FT6206 captouch driver
+"""
+
+import displayio
+import busio
+import board
+import dotclockframebuffer
+from framebufferio import FramebufferDisplay
+import adafruit_focaltouch
+
+displayio.release_displays()
+
+# Initialize the Display
+tft_pins = dict(board.TFT_PINS)
+
+tft_timings = {
+    "frequency": 16000000,
+    "width": 720,
+    "height": 720,
+    "hsync_pulse_width": 2,
+    "hsync_front_porch": 46,
+    "hsync_back_porch": 44,
+    "vsync_pulse_width": 2,
+    "vsync_front_porch": 16,
+    "vsync_back_porch": 18,
+    "hsync_idle_low": False,
+    "vsync_idle_low": False,
+    "de_idle_high": False,
+    "pclk_active_high": False,
+    "pclk_idle_high": False,
+}
+
+init_sequence_tl040hds20 = bytes()
+
+board.I2C().deinit()
+i2c = busio.I2C(board.SCL, board.SDA, frequency=100_000)
+tft_io_expander = dict(board.TFT_IO_EXPANDER)
+# tft_io_expander['i2c_address'] = 0x38 # uncomment for rev B
+dotclockframebuffer.ioexpander_send_init_sequence(
+    i2c, init_sequence_tl040hds20, **tft_io_expander
+)
+
+fb = dotclockframebuffer.DotClockFramebuffer(**tft_pins, **tft_timings)
+display = FramebufferDisplay(fb, auto_refresh=False)
+
+# Main Program
+pixel_size = 6
+palette_width = 160
+palette_height = display.height // 8
+
+bitmap = displayio.Bitmap(display.width, display.height, 65535)
+
+# Create a TileGrid to hold the bitmap
+tile_grid = displayio.TileGrid(
+    bitmap,
+    pixel_shader=displayio.ColorConverter(input_colorspace=displayio.Colorspace.RGB565),
+)
+
+# Create a Group to hold the TileGrid
+group = displayio.Group()
+
+# Add the TileGrid to the Group
+group.append(tile_grid)
+
+# Add the Group to the Display
+display.root_group = group
+
+display.auto_refresh = True
+
+ft = adafruit_focaltouch.Adafruit_FocalTouch(i2c, address=0x48)
+
+current_color = displayio.ColorConverter().convert(0xFFFFFF)
+
+for i in range(palette_width):
+    color_index = i * 255 // palette_width
+    rgb565 = displayio.ColorConverter().convert(
+        color_index | color_index << 8 | color_index << 16
+    )
+    r_mask = 0xF800
+    g_mask = 0x07E0
+    b_mask = 0x001F
+    for j in range(palette_height):
+        bitmap[i, j + palette_height] = rgb565 & b_mask
+        bitmap[i, j + palette_height * 2] = rgb565 & (b_mask | g_mask)
+        bitmap[i, j + palette_height * 3] = rgb565 & g_mask
+        bitmap[i, j + palette_height * 4] = rgb565 & (r_mask | g_mask)
+        bitmap[i, j + palette_height * 5] = rgb565 & r_mask
+        bitmap[i, j + palette_height * 6] = rgb565 & (r_mask | b_mask)
+        bitmap[i, j + palette_height * 7] = rgb565
+
+while True:
+    if ft.touched:
+        try:
+            for touch in ft.touches:
+                x = touch["x"]
+                y = touch["y"]
+                if x < palette_width:
+                    current_color = bitmap[x, y]
+                else:
+                    for i in range(pixel_size):
+                        for j in range(pixel_size):
+                            x_pixel = x - (pixel_size // 2) + i
+                            y_pixel = y - (pixel_size // 2) + j
+                            if (
+                                0 <= x_pixel < display.width
+                                and 0 <= y_pixel < display.height
+                            ):
+                                bitmap[x_pixel, y_pixel] = current_color
+        except RuntimeError:
+            pass