Add grayscale support

adafruit_il0373.py

@@ -55,13 +55,61 @@
     b"\x01\x05\x03\x00\x2b\x2b\x09"  # power setting
     b"\x06\x03\x17\x17\x17"  # booster soft start
     b"\x04\x80\xc8"  # power on and wait 200 ms
-    b"\x00\x01\xcf"  # panel setting
+    b"\x00\x01\x0f"  # panel setting. Further filled in below.
     b"\x50\x01\x37"  # CDI setting
-    b"\x30\x01\x29"  # PLL
+    b"\x30\x01\x29"  # PLL set to 150 Hz
     b"\x61\x03\x00\x00\x00"  # Resolution
     b"\x82\x81\x32\x0a"  # VCM DC and delay 50ms
 )
 
+_GRAYSCALE_LUT = (
+    # Common voltage
+    b"\x20\x2a"
+    b"\x00\x0A\x00\x00\x00\x01"
+    b"\x60\x14\x14\x00\x00\x01"
+    b"\x00\x14\x00\x00\x00\x01"
+    b"\x00\x13\x0A\x01\x00\x01"
+    b"\x00\x00\x00\x00\x00\x00"
+    b"\x00\x00\x00\x00\x00\x00"
+    b"\x00\x00\x00\x00\x00\x00"
+    # White to White
+    b"\x21\x2a"
+    b"\x40\x0A\x00\x00\x00\x01"
+    b"\x90\x14\x14\x00\x00\x01"
+    b"\x10\x14\x0A\x00\x00\x01"
+    b"\xA0\x13\x01\x00\x00\x01"
+    b"\x00\x00\x00\x00\x00\x00"
+    b"\x00\x00\x00\x00\x00\x00"
+    b"\x00\x00\x00\x00\x00\x00"
+    # Black to White
+    b"\x22\x2a"
+    b"\x40\x0A\x00\x00\x00\x01"
+    b"\x90\x14\x14\x00\x00\x01"
+    b"\x00\x14\x0A\x00\x00\x01"
+    b"\x99\x0C\x01\x03\x04\x01"
+    b"\x00\x00\x00\x00\x00\x00"
+    b"\x00\x00\x00\x00\x00\x00"
+    b"\x00\x00\x00\x00\x00\x00"
+    # White to Black
+    b"\x23\x2a"
+    b"\x40\x0A\x00\x00\x00\x01"
+    b"\x90\x14\x14\x00\x00\x01"
+    b"\x00\x14\x0A\x00\x00\x01"
+    b"\x99\x0B\x04\x04\x01\x01"
+    b"\x00\x00\x00\x00\x00\x00"
+    b"\x00\x00\x00\x00\x00\x00"
+    b"\x00\x00\x00\x00\x00\x00"
+    # Black to Black
+    b"\x24\x2a"
+    b"\x80\x0A\x00\x00\x00\x01"
+    b"\x90\x14\x14\x00\x00\x01"
+    b"\x20\x14\x0A\x00\x00\x01"
+    b"\x50\x13\x01\x00\x00\x01"
+    b"\x00\x00\x00\x00\x00\x00"
+    b"\x00\x00\x00\x00\x00\x00"
+    b"\x00\x00\x00\x00\x00\x00"
+)
+
 _STOP_SEQUENCE = (
     b"\x50\x01\x17"  # CDI setting
     b"\x82\x01\x00"  # VCM DC and delay 50ms
@@ -90,7 +138,12 @@ class IL0373(displayio.EPaperDisplay):
     """
 
     def __init__(self, bus, swap_rams=False, **kwargs):
-        start_sequence = bytearray(_START_SEQUENCE)
+        if kwargs.get("grayscale", False):
+            start_sequence = bytearray(len(_START_SEQUENCE) + len(_GRAYSCALE_LUT))
+            start_sequence[: len(_START_SEQUENCE)] = _START_SEQUENCE
+            start_sequence[len(_START_SEQUENCE) :] = _GRAYSCALE_LUT
+        else:
+            start_sequence = bytearray(_START_SEQUENCE)
 
         width = kwargs["width"]
         height = kwargs["height"]
@@ -109,6 +162,25 @@ def __init__(self, bus, swap_rams=False, **kwargs):
             write_color_ram_command = 0x13
             color_bits_inverted = kwargs.pop("color_bits_inverted", True)
             black_bits_inverted = kwargs.pop("black_bits_inverted", False)
+        if "highlight_color" not in kwargs:
+            start_sequence[17] |= 1 << 4  # Set BWR to only do black and white.
+        if kwargs.get("grayscale", False):
+            start_sequence[17] |= (
+                1 << 5
+            )  # Set REG_EN to use the LUT sequence from the registers.
+            start_sequence[6] = 0x13  # Boost the voltage
+            start_sequence[23] = 0x3C  # PLL set to 50 Hz (M = 7, N = 4)
+
+        # Set the resolution to scan
+        if width > 128:
+            start_sequence[17] |= 0b11 << 5  # 160x296
+        elif height > 252 or width > 96:
+            start_sequence[17] |= 0b10 << 5  # 128x296
+        elif height > 230:
+            start_sequence[17] |= 0b01 << 5  # 96x252
+        else:
+            pass  # 0b00 is 96x230
+
         super().__init__(
             bus,
             start_sequence,

examples/il0373_2.9_grayscale.py

@@ -0,0 +1,51 @@
+"""Simple test script for 2.9" 296x128 grayscale display.
+
+Supported products:
+  * Adafruit 2.9" Grayscale
+    * https://www.adafruit.com/product/4777
+  """
+
+import time
+import busio
+import board
+import displayio
+import adafruit_il0373
+
+displayio.release_displays()
+
+# This pinout works on a Feather M4 and may need to be altered for other boards.
+spi = busio.SPI(board.SCK, board.MOSI)  # Uses SCK and MOSI
+epd_cs = board.D9
+epd_dc = board.D10
+
+display_bus = displayio.FourWire(
+    spi, command=epd_dc, chip_select=epd_cs, baudrate=1000000
+)
+time.sleep(1)
+
+display = adafruit_il0373.IL0373(
+    display_bus,
+    width=296,
+    height=128,
+    rotation=270,
+    black_bits_inverted=False,
+    color_bits_inverted=False,
+    grayscale=True,
+    refresh_time=1,
+)
+
+g = displayio.Group()
+
+f = open("/display-ruler.bmp", "rb")
+
+pic = displayio.OnDiskBitmap(f)
+t = displayio.TileGrid(pic, pixel_shader=displayio.ColorConverter())
+g.append(t)
+
+display.show(g)
+
+display.refresh()
+
+print("refreshed")
+
+time.sleep(120)