From 53dce06f3562cf9512483cea0c1470d308849c09 Mon Sep 17 00:00:00 2001
From: Liz <liz@adafruit.com>
Date: Tue, 5 Aug 2025 19:56:35 -0400
Subject: [PATCH] quad color eInk demos

---
 .../.uno.test.only                            |   0
 .../Arduino_Quad_Color_ImageReader.ino        | 117 ++++++++++++++++++
 .../Arduino_Quad_Color_ImageReader/blinka.bmp | Bin 0 -> 91800 bytes
 .../Arduino_Quad_ThinkInk/.uno.test.only      |   0
 .../Arduino_Quad_ThinkInk.ino                 | 116 +++++++++++++++++
 Quad_Color_eInk_Demos/Blinka_EPD_Demo/code.py |  79 ++++++++++++
 .../Blinka_EPD_Pillow_Image_Demo/blinka.png   | Bin 0 -> 8057 bytes
 .../Blinka_EPD_Pillow_Image_Demo/code.py      |  92 ++++++++++++++
 8 files changed, 404 insertions(+)
 create mode 100644 Quad_Color_eInk_Demos/Arduino_Quad_Color_ImageReader/.uno.test.only
 create mode 100644 Quad_Color_eInk_Demos/Arduino_Quad_Color_ImageReader/Arduino_Quad_Color_ImageReader.ino
 create mode 100644 Quad_Color_eInk_Demos/Arduino_Quad_Color_ImageReader/blinka.bmp
 create mode 100644 Quad_Color_eInk_Demos/Arduino_Quad_ThinkInk/.uno.test.only
 create mode 100644 Quad_Color_eInk_Demos/Arduino_Quad_ThinkInk/Arduino_Quad_ThinkInk.ino
 create mode 100644 Quad_Color_eInk_Demos/Blinka_EPD_Demo/code.py
 create mode 100644 Quad_Color_eInk_Demos/Blinka_EPD_Pillow_Image_Demo/blinka.png
 create mode 100644 Quad_Color_eInk_Demos/Blinka_EPD_Pillow_Image_Demo/code.py

diff --git a/Quad_Color_eInk_Demos/Arduino_Quad_Color_ImageReader/.uno.test.only b/Quad_Color_eInk_Demos/Arduino_Quad_Color_ImageReader/.uno.test.only
new file mode 100644
index 000000000..e69de29bb
diff --git a/Quad_Color_eInk_Demos/Arduino_Quad_Color_ImageReader/Arduino_Quad_Color_ImageReader.ino b/Quad_Color_eInk_Demos/Arduino_Quad_Color_ImageReader/Arduino_Quad_Color_ImageReader.ino
new file mode 100644
index 000000000..dccba00ed
--- /dev/null
+++ b/Quad_Color_eInk_Demos/Arduino_Quad_Color_ImageReader/Arduino_Quad_Color_ImageReader.ino
@@ -0,0 +1,117 @@
+// SPDX-FileCopyrightText: 2025 Liz Clark for Adafruit Industries
+//
+// SPDX-License-Identifier: MIT
+
+// Adafruit_ImageReader test for Adafruit E-Ink Breakouts.
+// Demonstrates loading images from SD card or flash memory to the screen,
+// to RAM, and how to query image file dimensions.
+// Requires BMP file in root directory of QSPI Flash:
+// blinka.bmp.
+
+#include <Adafruit_GFX.h>         // Core graphics library
+#include "Adafruit_ThinkInk.h"
+#include <SdFat_Adafruit_Fork.h>  // SD card & FAT filesystem library
+#include <Adafruit_SPIFlash.h>    // SPI / QSPI flash library
+#include <Adafruit_ImageReader_EPD.h> // Image-reading functions
+
+// Comment out the next line to load from SPI/QSPI flash instead of SD card:
+#define USE_SD_CARD
+
+#define EPD_DC 10
+#define EPD_CS 9
+#define EPD_BUSY 7 // can set to -1 to not use a pin (will wait a fixed delay)
+#define SRAM_CS 6
+#define EPD_RESET 8  // can set to -1 and share with microcontroller Reset!
+#define EPD_SPI &SPI // primary SPI
+#define SD_CS       5  // SD card chip select
+
+// 2.13" Quadcolor EPD with JD79661 chipset
+ThinkInk_213_Quadcolor_AJHE5 display(EPD_DC, EPD_RESET, EPD_CS, SRAM_CS, EPD_BUSY,
+                                     EPD_SPI);
+
+#if defined(USE_SD_CARD)
+  SdFat                    SD;         // SD card filesystem
+  Adafruit_ImageReader_EPD reader(SD); // Image-reader object, pass in SD filesys
+#else
+
+// SPI or QSPI flash filesystem (i.e. CIRCUITPY drive)
+  #if defined(__SAMD51__) || defined(NRF52840_XXAA)
+    Adafruit_FlashTransport_QSPI flashTransport(PIN_QSPI_SCK, PIN_QSPI_CS,
+      PIN_QSPI_IO0, PIN_QSPI_IO1, PIN_QSPI_IO2, PIN_QSPI_IO3);
+  #else
+    #if (SPI_INTERFACES_COUNT == 1 || defined(ADAFRUIT_CIRCUITPLAYGROUND_M0))
+      Adafruit_FlashTransport_SPI flashTransport(SS, &SPI);
+    #else
+      Adafruit_FlashTransport_SPI flashTransport(SS1, &SPI1);
+    #endif
+  #endif
+  Adafruit_SPIFlash         flash(&flashTransport);
+  FatVolume             filesys;
+  Adafruit_ImageReader_EPD  reader(filesys); // Image-reader, pass in flash filesys
+#endif
+
+Adafruit_Image_EPD   img;        // An image loaded into RAM
+int32_t              width  = 0, // BMP image dimensions
+                     height = 0;
+
+void setup(void) {
+
+  ImageReturnCode stat; // Status from image-reading functions
+
+  Serial.begin(115200);
+  while(!Serial);           // Wait for Serial Monitor before continuing
+
+  display.begin();
+  display.setRotation(3);
+
+  // The Adafruit_ImageReader constructor call (above, before setup())
+  // accepts an uninitialized SdFat or FatVolume object. This MUST
+  // BE INITIALIZED before using any of the image reader functions!
+  Serial.print(F("Initializing filesystem..."));
+  // SPI or QSPI flash requires two steps, one to access the bare flash
+  // memory itself, then the second to access the filesystem within...
+#if defined(USE_SD_CARD)
+  // SD card is pretty straightforward, a single call...
+  if(!SD.begin(SD_CS, SD_SCK_MHZ(10))) { // Breakouts require 10 MHz limit due to longer wires
+    Serial.println(F("SD begin() failed"));
+    for(;;); // Fatal error, do not continue
+  }
+#else
+  // SPI or QSPI flash requires two steps, one to access the bare flash
+  // memory itself, then the second to access the filesystem within...
+  if(!flash.begin()) {
+    Serial.println(F("flash begin() failed"));
+    for(;;);
+  }
+  if(!filesys.begin(&flash)) {
+    Serial.println(F("filesys begin() failed"));
+    for(;;);
+  }
+#endif
+  Serial.println(F("OK!"));
+
+  // Load full-screen BMP file 'blinka.bmp' at position (0,0) (top left).
+  // Notice the 'reader' object performs this, with 'epd' as an argument.
+  Serial.print(F("Loading blinka.bmp to canvas..."));
+  stat = reader.drawBMP((char *)"/blinka.bmp", display, 0, 0);
+  reader.printStatus(stat); // How'd we do?
+  display.display();
+
+  // Query the dimensions of image 'blinka.bmp' WITHOUT loading to screen:
+  Serial.print(F("Querying blinka.bmp image size..."));
+  stat = reader.bmpDimensions("blinka.bmp", &width, &height);
+  reader.printStatus(stat);   // How'd we do?
+  if(stat == IMAGE_SUCCESS) { // If it worked, print image size...
+    Serial.print(F("Image dimensions: "));
+    Serial.print(width);
+    Serial.write('x');
+    Serial.println(height);
+  }
+
+  delay(30 * 1000); // Pause 30 seconds before continuing because it's eInk
+
+}
+
+void loop() {
+
+}
diff --git a/Quad_Color_eInk_Demos/Arduino_Quad_Color_ImageReader/blinka.bmp b/Quad_Color_eInk_Demos/Arduino_Quad_Color_ImageReader/blinka.bmp
new file mode 100644
index 0000000000000000000000000000000000000000..0cb13dc89ae45a8a8382afd5718881c0c8b35b0e
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HcmV?d00001

diff --git a/Quad_Color_eInk_Demos/Arduino_Quad_ThinkInk/.uno.test.only b/Quad_Color_eInk_Demos/Arduino_Quad_ThinkInk/.uno.test.only
new file mode 100644
index 000000000..e69de29bb
diff --git a/Quad_Color_eInk_Demos/Arduino_Quad_ThinkInk/Arduino_Quad_ThinkInk.ino b/Quad_Color_eInk_Demos/Arduino_Quad_ThinkInk/Arduino_Quad_ThinkInk.ino
new file mode 100644
index 000000000..13a0417d5
--- /dev/null
+++ b/Quad_Color_eInk_Demos/Arduino_Quad_ThinkInk/Arduino_Quad_ThinkInk.ino
@@ -0,0 +1,116 @@
+// SPDX-FileCopyrightText: 2025 Liz Clark for Adafruit Industries
+//
+// SPDX-License-Identifier: MIT
+
+/***************************************************
+  Adafruit invests time and resources providing this open source code,
+  please support Adafruit and open-source hardware by purchasing
+  products from Adafruit!
+
+  Written by Limor Fried/Ladyada for Adafruit Industries.
+  MIT license, all text above must be included in any redistribution
+ ****************************************************/
+
+#include "Adafruit_ThinkInk.h"
+
+#ifdef ARDUINO_ADAFRUIT_FEATHER_RP2040_THINKINK // detects if compiling for
+                                                // Feather RP2040 ThinkInk
+#define EPD_DC PIN_EPD_DC       // ThinkInk 24-pin connector DC
+#define EPD_CS PIN_EPD_CS       // ThinkInk 24-pin connector CS
+#define EPD_BUSY PIN_EPD_BUSY   // ThinkInk 24-pin connector Busy
+#define SRAM_CS -1              // use onboard RAM
+#define EPD_RESET PIN_EPD_RESET // ThinkInk 24-pin connector Reset
+#define EPD_SPI &SPI1           // secondary SPI for ThinkInk
+#else
+#define EPD_DC 10
+#define EPD_CS 9
+#define EPD_BUSY 7 // can set to -1 to not use a pin (will wait a fixed delay)
+#define SRAM_CS 6
+#define EPD_RESET 8  // can set to -1 and share with microcontroller Reset!
+#define EPD_SPI &SPI // primary SPI
+#endif
+
+// 2.13" Quadcolor EPD with JD79661 chipset
+ThinkInk_213_Quadcolor_AJHE5 display(EPD_DC, EPD_RESET, EPD_CS, SRAM_CS, EPD_BUSY,
+                                     EPD_SPI);
+
+void setup() {
+  Serial.begin(115200);
+  while (!Serial) {
+    delay(10);
+  }
+  Serial.println("Adafruit EPD full update test in red/yellow/black/white");
+  display.begin(THINKINK_QUADCOLOR);
+}
+
+void loop() {
+  Serial.println("Banner demo");
+  display.clearBuffer();
+  display.setTextSize(3);
+  display.setCursor((display.width() - 144) / 2, (display.height() - 24) / 2);
+  String text = "QuadColor";
+  uint16_t colors[] = {EPD_BLACK, EPD_RED, EPD_YELLOW};
+  
+  for (int i = 0; i < text.length(); i++) {
+    // Change color for every character (0: BLACK, 1: RED, 2: YELLOW, 3: BLACK, etc.)
+    display.setTextColor(colors[i % 3]);
+    display.print(text.charAt(i));
+  }
+  display.display();
+  
+  delay(15000);
+
+  Serial.println("Color quadrant demo");
+  display.clearBuffer();
+  // Top-left quadrant - EPD_BLACK
+  display.fillRect(0, 0, display.width() / 2, display.height() / 2, EPD_BLACK);
+  // Top-right quadrant - EPD_RED  
+  display.fillRect(display.width() / 2, 0, display.width() / 2, display.height() / 2, EPD_RED);
+  // Bottom-left quadrant - EPD_YELLOW
+  display.fillRect(0, display.height() / 2, display.width() / 2, display.height() / 2, EPD_YELLOW);
+  // Bottom-right quadrant - assume you have a 4th color like EPD_WHITE or another color
+  display.fillRect(display.width() / 2, display.height() / 2, display.width() / 2, display.height() / 2, EPD_WHITE);
+
+  display.display();
+
+  delay(15000);
+
+  Serial.println("Text demo");
+  // large block of text
+  display.clearBuffer();
+  display.setTextSize(1);
+  testdrawtext(
+      "Lorem ipsum dolor sit amet, consectetur adipiscing elit. Curabitur "
+      "adipiscing ante sed nibh tincidunt feugiat. Maecenas enim massa, "
+      "fringilla sed malesuada et, malesuada sit amet turpis. Sed porttitor "
+      "neque ut ante pretium vitae malesuada nunc bibendum. Nullam aliquet "
+      "ultrices massa eu hendrerit. Ut sed nisi lorem. In vestibulum purus a "
+      "tortor imperdiet posuere. ",
+      EPD_BLACK);
+  display.display();
+
+  delay(15000);
+
+  display.clearBuffer();
+  for (int16_t i = 0; i < display.width(); i += 4) {
+    display.drawLine(0, 0, i, display.height() - 1, EPD_BLACK);
+  }
+  for (int16_t i = 0; i < display.height(); i += 4) {
+    display.drawLine(display.width() - 1, 0, 0, i, EPD_RED);
+  }
+  for (int16_t i = 0; i < display.width(); i += 4) {
+     display.drawLine(display.width()/2, display.height()-1, i, 0, 
+                      EPD_YELLOW);
+  }
+  
+  display.display();
+
+  delay(15000);
+}
+
+void testdrawtext(const char *text, uint16_t color) {
+  display.setCursor(0, 0);
+  display.setTextColor(color);
+  display.setTextWrap(true);
+  display.print(text);
+}
diff --git a/Quad_Color_eInk_Demos/Blinka_EPD_Demo/code.py b/Quad_Color_eInk_Demos/Blinka_EPD_Demo/code.py
new file mode 100644
index 000000000..458fb4c2c
--- /dev/null
+++ b/Quad_Color_eInk_Demos/Blinka_EPD_Demo/code.py
@@ -0,0 +1,79 @@
+# SPDX-FileCopyrightText: 2021 ladyada for Adafruit Industries
+# SPDX-License-Identifier: MIT
+"""Blinka EPD Demo for the Quad Color eInk"""
+import board
+import digitalio
+from PIL import Image, ImageDraw, ImageFont
+
+from adafruit_epd.epd import Adafruit_EPD
+from adafruit_epd.jd79661 import Adafruit_JD79661
+
+# create the spi device and pins we will need
+spi = board.SPI()
+ecs = digitalio.DigitalInOut(board.CE0)
+dc = digitalio.DigitalInOut(board.D25)
+srcs = None
+rst = digitalio.DigitalInOut(board.D27)  # can be None to not use this pin
+busy = digitalio.DigitalInOut(board.D17)  # can be None to not use this pin
+
+display = Adafruit_JD79661(122, 250, spi,
+                          cs_pin=ecs, dc_pin=dc, sramcs_pin=srcs,
+                          rst_pin=rst, busy_pin=busy)
+
+display.rotation = 3
+width = display.width
+height = display.height
+image = Image.new("RGB", (width, height))
+
+WHITE = (0xFF, 0xFF, 0xFF)
+YELLOW = (0xFF, 0xFF, 0x00)
+RED = (0xFF, 0x00, 0x00)
+BLACK = (0x00, 0x00, 0x00)
+
+# clear the buffer
+display.fill(Adafruit_EPD.WHITE)
+
+# Get drawing object to draw on image.
+draw = ImageDraw.Draw(image)
+# empty it
+draw.rectangle((0, 0, width, height), fill=WHITE)
+
+# Draw an outline box
+draw.rectangle((1, 1, width - 2, height - 2), outline=BLACK, fill=WHITE)
+
+# Draw some shapes.
+# First define some constants to allow easy resizing of shapes.
+padding = 5
+shape_width = 30
+top = padding
+bottom = height - padding
+# Move left to right keeping track of the current x position for drawing shapes.
+x = padding
+# Draw an ellipse.
+draw.ellipse((x, top, x + shape_width, bottom), outline=YELLOW, fill=WHITE)
+x += shape_width + padding
+# Draw a rectangle.
+draw.rectangle((x, top, x + shape_width, bottom), outline=RED, fill=BLACK)
+x += shape_width + padding
+# Draw a triangle.
+draw.polygon(
+    [(x, bottom), (x + shape_width / 2, top), (x + shape_width, bottom)],
+    outline=BLACK,
+    fill=RED,
+)
+x += shape_width + padding
+# Draw an X.
+draw.line((x, bottom, x + shape_width, top), fill=YELLOW)
+draw.line((x, top, x + shape_width, bottom), fill=YELLOW)
+x += shape_width + padding
+
+# Load default font.
+font = ImageFont.truetype("/usr/share/fonts/truetype/dejavu/DejaVuSans.ttf", 20)
+
+draw.text((x, top), "Hello", font=font, fill=YELLOW)
+draw.text((x, top + 20), "World!", font=font, fill=YELLOW)
+
+# Display image.
+display.image(image)
+
+display.display()
diff --git a/Quad_Color_eInk_Demos/Blinka_EPD_Pillow_Image_Demo/blinka.png b/Quad_Color_eInk_Demos/Blinka_EPD_Pillow_Image_Demo/blinka.png
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diff --git a/Quad_Color_eInk_Demos/Blinka_EPD_Pillow_Image_Demo/code.py b/Quad_Color_eInk_Demos/Blinka_EPD_Pillow_Image_Demo/code.py
new file mode 100644
index 000000000..10e6f74cb
--- /dev/null
+++ b/Quad_Color_eInk_Demos/Blinka_EPD_Pillow_Image_Demo/code.py
@@ -0,0 +1,92 @@
+# SPDX-FileCopyrightText: 2019 Melissa LeBlanc-Williams for Adafruit Industries
+# SPDX-License-Identifier: MIT
+"""
+Image resizing and drawing using the Pillow Library for Quad Color eInk
+"""
+import board
+import digitalio
+from PIL import Image, ImageEnhance
+from adafruit_epd.jd79661 import Adafruit_JD79661
+
+# create the spi device and pins we will need
+spi = board.SPI()
+ecs = digitalio.DigitalInOut(board.CE0)
+dc = digitalio.DigitalInOut(board.D25)
+srcs = None
+rst = digitalio.DigitalInOut(board.D27)  # can be None to not use this pin
+busy = digitalio.DigitalInOut(board.D17)  # can be None to not use this pin
+
+# give them all to our driver
+display = Adafruit_JD79661(122, 250,        # 2.13" Quad-color display
+    spi,
+    cs_pin=ecs,
+    dc_pin=dc,
+    sramcs_pin=srcs,
+    rst_pin=rst,
+    busy_pin=busy,
+)
+display.rotation = 3
+
+image = Image.open("blinka.png")
+
+# Scale the image to the smaller screen dimension
+image_ratio = image.width / image.height
+screen_ratio = display.width / display.height
+if screen_ratio < image_ratio:
+    scaled_width = image.width * display.height // image.height
+    scaled_height = display.height
+else:
+    scaled_width = display.width
+    scaled_height = image.height * display.width // image.width
+image = image.resize((scaled_width, scaled_height), Image.BICUBIC)
+
+# Crop and center the image
+x = scaled_width // 2 - display.width // 2
+y = scaled_height // 2 - display.height // 2
+image = image.crop((x, y, x + display.width, y + display.height)).convert("RGB")
+
+quad_colors = [
+    (0, 0, 0),        # Black
+    (255, 255, 255),  # White
+    (255, 0, 0),      # Red
+    (255, 255, 0),    # Yellow
+]
+palette_image = Image.new('P', (1, 1))
+
+# Create palette data - PIL expects 768 values (256 colors * 3 channels)
+palette_data = []
+for color in quad_colors:
+    palette_data.extend(color)
+# Fill remaining palette entries with black
+for i in range(4, 256):
+    palette_data.extend([0, 0, 0])
+
+palette_image.putpalette(palette_data)
+
+enhancer = ImageEnhance.Color(image)
+image = enhancer.enhance(1.5)
+
+temp_image = image.quantize(palette=palette_image, dither=Image.Dither.FLOYDSTEINBERG)
+
+pixels = temp_image.load()
+width, height = temp_image.size
+
+final_palette = Image.new('P', (1, 1))
+final_palette.putpalette(palette_data)
+final_image = Image.new('P', (width, height))
+final_pixels = final_image.load()
+
+# Copy pixels, ensuring they use indices 0-3
+for y in range(height):
+    for x in range(width):
+        # Clamp pixel values to 0-3 range
+        final_pixels[x, y] = min(pixels[x, y], 3)
+
+final_image.putpalette(palette_data)
+
+# Convert back to RGB for display
+image = final_image.convert('RGB')
+
+# Display image.
+display.image(image)
+display.display()