Merge pull request #44 from mikeysklar/grayscale4-2in66-6392

2.66" gray4 for ADA bare eInk #6392

Author: BlitzCityDIY

examples/ssd1680_2.66_grayscale.py

@@ -0,0 +1,75 @@
+# SPDX-FileCopyrightText: 2026 Mikey Sklar, written for Adafruit Industries
+#
+# SPDX-License-Identifier: Unlicense
+
+"""4-gray grayscale example for the Adafruit 2.66" 296x152 E-Ink Display (#6392).
+
+Displays a 4-level gray ramp (white / light gray / dark gray / black) across the
+full panel. Uses the FPC7519 waveform LUT, which transfers cleanly to this panel.
+
+Tested on Adafruit Feather RP2040 ThinkInk with a panel labeled FPC-A003 1S on
+the ribbon connector.
+
+Hardware: connect the 24-pin FPC ribbon directly to the ThinkInk board's ZIF connector.
+No external wiring required.
+"""
+
+import time
+
+import board
+import busio
+import displayio
+from fourwire import FourWire
+
+import adafruit_ssd1680
+
+displayio.release_displays()
+
+spi = busio.SPI(board.EPD_SCK, board.EPD_MOSI)
+display_bus = FourWire(
+    spi,
+    command=board.EPD_DC,
+    chip_select=board.EPD_CS,
+    reset=board.EPD_RESET,
+    baudrate=1000000,
+)
+time.sleep(1)
+
+display = adafruit_ssd1680.SSD1680(
+    display_bus,
+    width=296,
+    height=152,
+    busy_pin=board.EPD_BUSY,
+    rotation=270,
+    colstart=0,
+    vcom=0x1C,
+    vsh2=0xAE,
+    custom_lut=adafruit_ssd1680.FPC7519_LUT,
+    grayscale=True,
+)
+
+W, H = 296, 152
+bmp = displayio.Bitmap(W, H, 4)
+pal = displayio.Palette(4)
+pal[0] = 0xFFFFFF  # white
+pal[1] = 0xAAAAAA  # light gray
+pal[2] = 0x555555  # dark gray
+pal[3] = 0x000000  # black
+
+COL = W // 4
+for y in range(H):
+    for x in range(W):
+        bmp[x, y] = x // COL
+
+g = displayio.Group()
+g.append(displayio.TileGrid(bmp, pixel_shader=pal))
+display.root_group = g
+
+print("Refreshing...")
+display.refresh()
+print("Done.")
+
+time.sleep(display.time_to_refresh + 5)
+
+while True:
+    time.sleep(10)