Version 1.1.1

2.7" b/w GDEW027W3 with fast partial update support

ConnectingHardware.md

@@ -1,29 +1,45 @@
-#### GxEPD2 : a simple E-Paper display library for Arduino for SPI e-paper displays panels from Dalian Good Display and SPI e-paper display boards from Waveshare
-
-#### important note :
-#### - these displays are for 3.3V supply and 3.3V data lines
-#### - never connect data lines directly to 5V Arduino data pins, you may use e.g. 4k7 series resistor
-#### - do not forget to connect GND
+# GxEPD2
+## Arduino Display Library for SPI E-Paper Displays
+
+- With full Graphics and Text support using Adafruit_GFX
+
+- For SPI e-paper displays from Dalian Good Display 
+- and SPI e-paper boards from Waveshare
+
+### important note :
+- these displays are for 3.3V supply and 3.3V data lines
+- never connect data lines directly to 5V Arduino data pins, use e.g. 4k7/10k resistor divider
+- series resistor only is not enough for reliable operation (back-feed effect through protection diodes)
+- do not forget to connect GND
 
 ## mapping suggestions
 
 #### mapping suggestion from Waveshare SPI e-Paper to Wemos D1 mini
-##### - BUSY -> D2, RST -> D4, DC -> D3, CS -> D8, CLK -> D5, DIN -> D7, GND -> GND, 3.3V -> 3.3V
+- BUSY -> D2, RST -> D4, DC -> D3, CS -> D8, CLK -> D5, DIN -> D7, GND -> GND, 3.3V -> 3.3V
+
+#### mapping suggestion from Waveshare SPI e-Paper to ESP8266 NodeMCU:
+- BUSY -> D2, RST -> D4, DC -> D3, CS -> D8, CLK -> D5, DIN -> D7, GND -> GND, 3.3V -> 3.3V
 
 #### mapping suggestion from Waveshare SPI e-Paper to generic ESP8266
-##### - BUSY -> GPIO4, RST -> GPIO2, DC -> GPIO0, CS -> GPIO15, CLK -> GPIO14, DIN -> GPIO13, GND -> GND, 3.3V -> 3.3V
+- BUSY -> GPIO4, RST -> GPIO2, DC -> GPIO0, CS -> GPIO15, CLK -> GPIO14, DIN -> GPIO13, GND -> GND, 3.3V -> 3.3V
+
+#### mapping suggestion (by G6EJD) from Waveshare SPI e-Paper to ESP8266 Huzzah:
+- BUSY -> 03, RST -> 15, DC -> 02, CS -> 00, CLK -> 14, DIN -> 13, GND -> GND, 3.3V -> 3.3V
 
 #### mapping suggestion for ESP32, e.g. LOLIN32, see .../variants/.../pins_arduino.h for your board
-##### - NOTE: there are variants with different pins for SPI ! CHECK SPI PINS OF YOUR BOARD
-##### - BUSY -> 4, RST -> 16, DC -> 17, CS -> SS(5), CLK -> SCK(18), DIN -> MOSI(23), GND -> GND, 3.3V -> 3.3V
+- NOTE: there are variants with different pins for SPI ! CHECK SPI PINS OF YOUR BOARD
+- BUSY -> 4, RST -> 16, DC -> 17, CS -> SS(5), CLK -> SCK(18), DIN -> MOSI(23), GND -> GND, 3.3V -> 3.3V
 
 #### mapping suggestion for STM32F1, e.g. STM32F103C8T6 "BluePill"
-##### - BUSY -> A1, RST -> A2, DC -> A3, CS-> A4, CLK -> A5, DIN -> A7
+- BUSY -> A1, RST -> A2, DC -> A3, CS-> A4, CLK -> A5, DIN -> A7
 
 #### mapping suggestion for AVR, UNO, NANO etc.
-##### - BUSY -> 7, RST -> 9, DC -> 8, CS-> 10, CLK -> 13, DIN -> 11
+- BUSY -> 7, RST -> 9, DC -> 8, CS-> 10, CLK -> 13, DIN -> 11
+
+#### mapping suggestion for Arduino MEGA
+- BUSY -> 7, RST -> 9, DC -> 8, CS-> 53, CLK -> 52, DIN -> 51
 
-## connection scheme for DESTM32-S2 connection board for e-paper panels:
+## connection scheme for (discontinued) DESTM32-S2 connection board for e-paper panels:
 
 ```
    connection to the e-Paper display is through DESTM32-S2 connection board, available from Good Display

README.md

@@ -7,8 +7,10 @@
 - and SPI e-paper boards from Waveshare
 
 ### important note :
- - these displays are for 3.3V supply and 3.3V data lines.
- - never connect data lines directly to 5V data pins.
+- these displays are for 3.3V supply and 3.3V data lines
+- never connect data lines directly to 5V Arduino data pins, use e.g. 4k7/10k resistor divider
+- series resistor only is not enough for reliable operation (back-feed effect through protection diodes)
+- do not forget to connect GND
 
 ### Paged Drawing, Picture Loop
  - This library uses paged drawing to limit RAM use and cope with missing single pixel update support
@@ -35,7 +37,12 @@
 - Waveshare e-paper displays with SPI: http://forum.arduino.cc/index.php?topic=487007.0
 - Good Dispay ePaper for Arduino : https://forum.arduino.cc/index.php?topic=436411.0
 
-### Version 1.1.0
+### Version 1.1.1
+- 2.7" b/w GDEW027W3 with fast partial update support, based on new demo code wavetable
+- mapping suggestion added for Arduino MEGA
+- NOTE: use voltage divider resistors for 5V Arduinos, series resistor is not reliable enough
+- ConnectingHardware.md updated
+#### Version 1.1.0
 - added  support for GDEW0213I5F for 2.13" b/w 104x212 flexible display
 - updated GxEPD2_WiFi_Example and GxEPD2_Spiffs_Loader to use BearSSL on ESP8266, for large bitmap downloads
 #### Version 1.0.9

examples/GxEPD2_Example/GxEPD2_Example.ino

@@ -1,7 +1,7 @@
 // Display Library example for SPI e-paper panels from Dalian Good Display and boards from Waveshare.
 // Requires HW SPI and Adafruit_GFX. Caution: these e-papers require 3.3V supply AND data lines!
 //
-// Display Library based on Demo Example from Good Display: http://www.good-display.com/download_list/downloadcategoryid=34&isMode=false.html
+// Display Library based on Demo Example from Good Display: http://www.e-paper-display.com/download_list/downloadcategoryid=34&isMode=false.html
 //
 // Author: Jean-Marc Zingg
 //
@@ -32,6 +32,9 @@
 // mapping suggestion for AVR, UNO, NANO etc.
 // BUSY -> 7, RST -> 9, DC -> 8, CS-> 10, CLK -> 13, DIN -> 11
 
+// mapping suggestion for Arduino MEGA
+// BUSY -> 7, RST -> 9, DC -> 8, CS-> 53, CLK -> 52, DIN -> 51
+
 // base class GxEPD2_GFX can be used to pass references or pointers to the display instance as parameter, uses ~1.2k more code
 // enable or disable GxEPD2_GFX base class
 #define ENABLE_GxEPD2_GFX 0
@@ -150,6 +153,7 @@
 #endif
 
 #include "GxEPD2_boards_added.h"
+//#include "GxEPD2_more_boards_added.h" // private
 
 #if !defined(__AVR) && !defined(_BOARD_GENERIC_STM32F103C_H_)
 
@@ -563,6 +567,12 @@ void drawBitmaps200x200()
       display.writeScreenBuffer(); // use default for white
       display.writeImage(bitmaps[i], x, y, 200, 200, false, mirror_y, true);
       display.refresh(true);
+      if ((display.epd2.hasFastPartialUpdate) && (display.epd2.panel == GxEPD2::GDEW027W3))
+      {
+        // for differential update: set previous buffer equal to current (IL91874 doesn't switch on refresh)
+        // display.writeScreenBuffer(); // above is enough for the other controllers
+        display.epd2.writeImageAgain(bitmaps[i], x, y, 200, 200, false, mirror_y, true);
+      }
       delay(2000);
       x += 40;
       y += 40;
@@ -648,10 +658,17 @@ void drawBitmaps128x296()
 #ifdef _GxBitmaps176x264_H_
 void drawBitmaps176x264()
 {
+#if !defined(__AVR)
+  const unsigned char* bitmaps[] =
+  {
+    Bitmap176x264_1, Bitmap176x264_2, Bitmap176x264_3, Bitmap176x264_4, Bitmap176x264_5
+  };
+#else
   const unsigned char* bitmaps[] =
   {
-    Bitmap176x264_1, Bitmap176x264_2
+    Bitmap176x264_1, Bitmap176x264_2 //, Bitmap176x264_3, Bitmap176x264_4, Bitmap176x264_5
   };
+#endif
   if (display.epd2.panel == GxEPD2::GDEW027W3)
   {
     for (uint16_t i = 0; i < sizeof(bitmaps) / sizeof(char*); i++)
@@ -954,4 +971,3 @@ void drawBitmaps3c400x300()
   }
 }
 #endif
-

examples/GxEPD2_Example/GxEPD2_boards_added.h

@@ -22,23 +22,23 @@
 #define MAX_DISPAY_BUFFER_SIZE 15000ul // ~15k is a good compromise
 #define MAX_HEIGHT(EPD) (EPD::HEIGHT <= MAX_DISPAY_BUFFER_SIZE / (EPD::WIDTH / 8) ? EPD::HEIGHT : MAX_DISPAY_BUFFER_SIZE / (EPD::WIDTH / 8))
 // select one and adapt to your mapping
-//GxEPD2_BW<GxEPD2_154, MAX_HEIGHT(GxEPD2_154)> display(GxEPD2_154(/*CS=10*/ SS, /*DC=*/ 8, /*RST=*/ 9, /*BUSY=*/ 7));
-//GxEPD2_BW<GxEPD2_213, MAX_HEIGHT(GxEPD2_213)> display(GxEPD2_213(/*CS=10*/ SS, /*DC=*/ 8, /*RST=*/ 9, /*BUSY=*/ 7));
-//GxEPD2_BW<GxEPD2_213_flex, MAX_HEIGHT(GxEPD2_213_flex)> display(GxEPD2_213_flex(/*CS=10*/ SS, /*DC=*/ 8, /*RST=*/ 9, /*BUSY=*/ 7));
-//GxEPD2_BW<GxEPD2_290, MAX_HEIGHT(GxEPD2_290)> display(GxEPD2_290(/*CS=10*/ SS, /*DC=*/ 8, /*RST=*/ 9, /*BUSY=*/ 7));
-//GxEPD2_BW<GxEPD2_270, MAX_HEIGHT(GxEPD2_270)> display(GxEPD2_270(/*CS=10*/ SS, /*DC=*/ 8, /*RST=*/ 9, /*BUSY=*/ 7));
-//GxEPD2_BW<GxEPD2_420, MAX_HEIGHT(GxEPD2_420)> display(GxEPD2_420(/*CS=10*/ SS, /*DC=*/ 8, /*RST=*/ 9, /*BUSY=*/ 7));
-//GxEPD2_BW<GxEPD2_583, MAX_HEIGHT(GxEPD2_583)> display(GxEPD2_583(/*CS=10*/ SS, /*DC=*/ 8, /*RST=*/ 9, /*BUSY=*/ 7));
-//GxEPD2_BW<GxEPD2_750, MAX_HEIGHT(GxEPD2_750)> display(GxEPD2_750(/*CS=10*/ SS, /*DC=*/ 8, /*RST=*/ 9, /*BUSY=*/ 7));
+//GxEPD2_BW<GxEPD2_154, MAX_HEIGHT(GxEPD2_154)> display(GxEPD2_154(/*CS=77*/ SS, /*DC=*/ 8, /*RST=*/ 9, /*BUSY=*/ 7));
+//GxEPD2_BW<GxEPD2_213, MAX_HEIGHT(GxEPD2_213)> display(GxEPD2_213(/*CS=77*/ SS, /*DC=*/ 8, /*RST=*/ 9, /*BUSY=*/ 7));
+//GxEPD2_BW<GxEPD2_213_flex, MAX_HEIGHT(GxEPD2_213_flex)> display(GxEPD2_213_flex(/*CS=77*/ SS, /*DC=*/ 8, /*RST=*/ 9, /*BUSY=*/ 7));
+//GxEPD2_BW<GxEPD2_290, MAX_HEIGHT(GxEPD2_290)> display(GxEPD2_290(/*CS=77*/ SS, /*DC=*/ 8, /*RST=*/ 9, /*BUSY=*/ 7));
+//GxEPD2_BW<GxEPD2_270, MAX_HEIGHT(GxEPD2_270)> display(GxEPD2_270(/*CS=77*/ SS, /*DC=*/ 8, /*RST=*/ 9, /*BUSY=*/ 7));
+//GxEPD2_BW<GxEPD2_420, MAX_HEIGHT(GxEPD2_420)> display(GxEPD2_420(/*CS=77*/ SS, /*DC=*/ 8, /*RST=*/ 9, /*BUSY=*/ 7));
+//GxEPD2_BW<GxEPD2_583, MAX_HEIGHT(GxEPD2_583)> display(GxEPD2_583(/*CS=77*/ SS, /*DC=*/ 8, /*RST=*/ 9, /*BUSY=*/ 7));
+//GxEPD2_BW<GxEPD2_750, MAX_HEIGHT(GxEPD2_750)> display(GxEPD2_750(/*CS=77*/ SS, /*DC=*/ 8, /*RST=*/ 9, /*BUSY=*/ 7));
 // 3-color e-papers
 #define MAX_HEIGHT_3C(EPD) (EPD::HEIGHT <= (MAX_DISPAY_BUFFER_SIZE / 2) / (EPD::WIDTH / 8) ? EPD::HEIGHT : (MAX_DISPAY_BUFFER_SIZE / 2) / (EPD::WIDTH / 8))
-//GxEPD2_3C<GxEPD2_154c, MAX_HEIGHT_3C(GxEPD2_154c)> display(GxEPD2_154c(/*CS=10*/ SS, /*DC=*/ 8, /*RST=*/ 9, /*BUSY=*/ 7));
-//GxEPD2_3C<GxEPD2_213c, MAX_HEIGHT_3C(GxEPD2_213c)> display(GxEPD2_213c(/*CS=10*/ SS, /*DC=*/ 8, /*RST=*/ 9, /*BUSY=*/ 7));
-//GxEPD2_3C<GxEPD2_290c, MAX_HEIGHT_3C(GxEPD2_290c)> display(GxEPD2_290c(/*CS=10*/ SS, /*DC=*/ 8, /*RST=*/ 9, /*BUSY=*/ 7));
-//GxEPD2_3C<GxEPD2_270c, MAX_HEIGHT_3C(GxEPD2_270c)> display(GxEPD2_270c(/*CS=10*/ SS, /*DC=*/ 8, /*RST=*/ 9, /*BUSY=*/ 7));
-//GxEPD2_3C<GxEPD2_420c, MAX_HEIGHT_3C(GxEPD2_420c)> display(GxEPD2_420c(/*CS=10*/ SS, /*DC=*/ 8, /*RST=*/ 9, /*BUSY=*/ 7));
-//GxEPD2_3C<GxEPD2_583c, MAX_HEIGHT_3C(GxEPD2_583c)> display(GxEPD2_583c(/*CS=10*/ SS, /*DC=*/ 8, /*RST=*/ 9, /*BUSY=*/ 7));
-//GxEPD2_3C<GxEPD2_750c, MAX_HEIGHT_3C(GxEPD2_750c)> display(GxEPD2_750c(/*CS=10*/ SS, /*DC=*/ 8, /*RST=*/ 9, /*BUSY=*/ 7));
+//GxEPD2_3C<GxEPD2_154c, MAX_HEIGHT_3C(GxEPD2_154c)> display(GxEPD2_154c(/*CS=77*/ SS, /*DC=*/ 8, /*RST=*/ 9, /*BUSY=*/ 7));
+//GxEPD2_3C<GxEPD2_213c, MAX_HEIGHT_3C(GxEPD2_213c)> display(GxEPD2_213c(/*CS=77*/ SS, /*DC=*/ 8, /*RST=*/ 9, /*BUSY=*/ 7));
+//GxEPD2_3C<GxEPD2_290c, MAX_HEIGHT_3C(GxEPD2_290c)> display(GxEPD2_290c(/*CS=77*/ SS, /*DC=*/ 8, /*RST=*/ 9, /*BUSY=*/ 7));
+//GxEPD2_3C<GxEPD2_270c, MAX_HEIGHT_3C(GxEPD2_270c)> display(GxEPD2_270c(/*CS=77*/ SS, /*DC=*/ 8, /*RST=*/ 9, /*BUSY=*/ 7));
+//GxEPD2_3C<GxEPD2_420c, MAX_HEIGHT_3C(GxEPD2_420c)> display(GxEPD2_420c(/*CS=77*/ SS, /*DC=*/ 8, /*RST=*/ 9, /*BUSY=*/ 7));
+//GxEPD2_3C<GxEPD2_583c, MAX_HEIGHT_3C(GxEPD2_583c)> display(GxEPD2_583c(/*CS=77*/ SS, /*DC=*/ 8, /*RST=*/ 9, /*BUSY=*/ 7));
+//GxEPD2_3C<GxEPD2_750c, MAX_HEIGHT_3C(GxEPD2_750c)> display(GxEPD2_750c(/*CS=77*/ SS, /*DC=*/ 8, /*RST=*/ 9, /*BUSY=*/ 7));
 #endif
 
 // Arduino MKR1000 or MKRZERO
@@ -70,5 +70,22 @@
 //GxEPD2_3C<GxEPD2_750c, MAX_HEIGHT_3C(GxEPD2_750c)> display(GxEPD2_750c(/*CS=4*/ 4, /*DC=*/ 7, /*RST=*/ 6, /*BUSY=*/ 5));
 #endif
 
+#if defined(ESP32) && defined(ARDUINO_LOLIN_D32_PRO)
+// select one and adapt to your mapping, can use full buffer size (full HEIGHT)
+//GxEPD2_BW<GxEPD2_154, GxEPD2_154::HEIGHT> display(GxEPD2_154(/*CS=5*/ SS, /*DC=*/ 0, /*RST=*/ 2, /*BUSY=*/ 15));
+//GxEPD2_BW<GxEPD2_213, GxEPD2_213::HEIGHT> display(GxEPD2_213(/*CS=5*/ SS, /*DC=*/ 0, /*RST=*/ 2, /*BUSY=*/ 15));
+//GxEPD2_BW<GxEPD2_213_flex, GxEPD2_213_flex::HEIGHT> display(GxEPD2_213_flex(/*CS=5*/ SS, /*DC=*/ 0, /*RST=*/ 2, /*BUSY=*/ 15));
+//GxEPD2_BW<GxEPD2_290, GxEPD2_290::HEIGHT> display(GxEPD2_290(/*CS=5*/ SS, /*DC=*/ 0, /*RST=*/ 2, /*BUSY=*/ 15));
+//GxEPD2_BW<GxEPD2_270, GxEPD2_270::HEIGHT> display(GxEPD2_270(/*CS=5*/ SS, /*DC=*/ 0, /*RST=*/ 2, /*BUSY=*/ 15));
+//GxEPD2_BW<GxEPD2_420, GxEPD2_420::HEIGHT> display(GxEPD2_420(/*CS=5*/ SS, /*DC=*/ 0, /*RST=*/ 2, /*BUSY=*/ 15));
+//GxEPD2_BW<GxEPD2_750, GxEPD2_750::HEIGHT> display(GxEPD2_750(/*CS=5*/ SS, /*DC=*/ 0, /*RST=*/ 2, /*BUSY=*/ 15));
+// 3-color e-papers
+//GxEPD2_3C<GxEPD2_154c, GxEPD2_154c::HEIGHT> display(GxEPD2_154c(/*CS=5*/ SS, /*DC=*/ 0, /*RST=*/ 2, /*BUSY=*/ 15));
+//GxEPD2_3C<GxEPD2_213c, GxEPD2_213c::HEIGHT> display(GxEPD2_213c(/*CS=5*/ SS, /*DC=*/ 0, /*RST=*/ 2, /*BUSY=*/ 15));
+//GxEPD2_3C<GxEPD2_290c, GxEPD2_290c::HEIGHT> display(GxEPD2_290c(/*CS=5*/ SS, /*DC=*/ 0, /*RST=*/ 2, /*BUSY=*/ 15));
+//GxEPD2_3C<GxEPD2_270c, GxEPD2_270c::HEIGHT> display(GxEPD2_270c(/*CS=5*/ SS, /*DC=*/ 0, /*RST=*/ 2, /*BUSY=*/ 15));
+//GxEPD2_3C<GxEPD2_420c, GxEPD2_420c::HEIGHT> display(GxEPD2_420c(/*CS=5*/ SS, /*DC=*/ 0, /*RST=*/ 2, /*BUSY=*/ 15));
+//GxEPD2_3C<GxEPD2_750c, GxEPD2_750c::HEIGHT> display(GxEPD2_750c(/*CS=5*/ SS, /*DC=*/ 0, /*RST=*/ 2, /*BUSY=*/ 15));
 #endif
 
+#endif

library.properties

@@ -1,5 +1,5 @@
 name=GxEPD2
-version=1.1.0
+version=1.1.1
 author=Jean-Marc Zingg
 maintainer=Jean-Marc Zingg
 sentence=Arduino Display Library for SPI E-Paper displays from Dalian Good Display and Waveshare. 

src/GxEPD2.h

@@ -0,0 +1,51 @@
+// Display Library for SPI e-paper panels from Dalian Good Display and boards from Waveshare.
+// Requires HW SPI and Adafruit_GFX. Caution: these e-papers require 3.3V supply AND data lines!
+//
+// based on Demo Example from Good Display: http://www.e-paper-display.com/download_list/downloadcategoryid=34&isMode=false.html
+//
+// Author: Jean-Marc Zingg
+//
+// Version: see library.properties
+//
+// Library: https://github.com/ZinggJM/GxEPD2
+
+#ifndef _GxEPD2_H_
+#define _GxEPD2_H_
+
+#include <Arduino.h>
+#include <SPI.h>
+
+#define GxEPD_BLACK     0x0000
+#define GxEPD_DARKGREY  0x7BEF      /* 128, 128, 128 */
+#define GxEPD_LIGHTGREY 0xC618      /* 192, 192, 192 */
+#define GxEPD_WHITE     0xFFFF
+#define GxEPD_RED       0xF800      /* 255,   0,   0 */
+
+#define GxEPD_YELLOW    GxEPD_RED
+#define GxEPD_COLORED   GxEPD_RED
+
+class GxEPD2
+{
+  public:
+    enum Panel
+    {
+      GDEP015OC1, Waveshare_1_54_bw = GDEP015OC1,
+      GDE0213B1,  Waveshare_2_13_bw = GDE0213B1,
+      GDEW0213I5F, Waveshare_2_13_flex = GDEW0213I5F,
+      GDEH029A1,  Waveshare_2_9_bw = GDEH029A1,
+      GDEW027W3,  Waveshare_2_7_bw = GDEW027W3,
+      GDEW042T2,  Waveshare_4_2_bw = GDEW042T2,
+      GDEW0583T7, Waveshare_5_83_bw = GDEW0583T7,
+      GDEW075T8,  Waveshare_7_5_bw = GDEW075T8,
+      // 3-color
+      GDEW0154Z04, Waveshare_1_54_bwr = GDEW0154Z04,
+      GDEW0213Z16, Waveshare_2_13_bwr = GDEW0213Z16,
+      GDEW029Z10,  Waveshare_2_9_bwr = GDEW029Z10,
+      GDEW027C44,  Waveshare_2_7_bwr = GDEW027C44,
+      GDEW042Z15,  Waveshare_4_2_bwr = GDEW042Z15,
+      GDEW0583Z21, Waveshare_5_83_bwr = GDEW0583Z21,
+      GDEW075Z09,  Waveshare_7_5_bwr = GDEW075Z09
+    };
+};
+
+#endif

src/GxEPD2_3C.h

@@ -1,7 +1,7 @@
 // Display Library for SPI e-paper panels from Dalian Good Display and boards from Waveshare.
 // Requires HW SPI and Adafruit_GFX. Caution: these e-papers require 3.3V supply AND data lines!
 //
-// based on Demo Example from Good Display: http://www.good-display.com/download_list/downloadcategoryid=34&isMode=false.html
+// based on Demo Example from Good Display: http://www.e-paper-display.com/download_list/downloadcategoryid=34&isMode=false.html
 //
 // Author: Jean-Marc Zingg
 //
@@ -398,4 +398,3 @@ class GxEPD2_3C : public Adafruit_GFX
 };
 
 #endif
-

src/GxEPD2_BW.h

@@ -1,7 +1,7 @@
 // Display Library for SPI e-paper panels from Dalian Good Display and boards from Waveshare.
 // Requires HW SPI and Adafruit_GFX. Caution: these e-papers require 3.3V supply AND data lines!
 //
-// based on Demo Example from Good Display: http://www.good-display.com/download_list/downloadcategoryid=34&isMode=false.html
+// based on Demo Example from Good Display: http://www.e-paper-display.com/download_list/downloadcategoryid=34&isMode=false.html
 //
 // Author: Jean-Marc Zingg
 //
@@ -171,7 +171,7 @@ class GxEPD2_BW : public Adafruit_GFX
           epd2.refresh(_pw_x, _pw_y, _pw_w, _pw_h);
           if (epd2.hasFastPartialUpdate)
           {
-            epd2.writeImage(_buffer + offset, _pw_x, _pw_y, _pw_w, _pw_h);
+            epd2.writeImageAgain(_buffer + offset, _pw_x, _pw_y, _pw_w, _pw_h);
             epd2.refresh(_pw_x, _pw_y, _pw_w, _pw_h);
           }
         }
@@ -181,7 +181,7 @@ class GxEPD2_BW : public Adafruit_GFX
           epd2.refresh(false);
           if (epd2.hasFastPartialUpdate)
           {
-            epd2.writeImage(_buffer, 0, 0, WIDTH, HEIGHT);
+            epd2.writeImageAgain(_buffer, 0, 0, WIDTH, HEIGHT);
             epd2.refresh(true);
           }
         }
@@ -200,7 +200,8 @@ class GxEPD2_BW : public Adafruit_GFX
           //Serial.print("writeImage("); Serial.print(_pw_x); Serial.print(", "); Serial.print(dest_ys); Serial.print(", ");
           //Serial.print(_pw_w); Serial.print(", "); Serial.print(dest_ye - dest_ys); Serial.println(")");
           uint32_t offset = _reverse ? (_page_height - (dest_ye - dest_ys)) * _pw_w / 8 : 0;
-          epd2.writeImage(_buffer + offset, _pw_x, dest_ys, _pw_w, dest_ye - dest_ys);
+          if (!_second_phase) epd2.writeImage(_buffer + offset, _pw_x, dest_ys, _pw_w, dest_ye - dest_ys);
+          else epd2.writeImageAgain(_buffer + offset, _pw_x, dest_ys, _pw_w, dest_ye - dest_ys);
         }
         else
         {
@@ -229,7 +230,8 @@ class GxEPD2_BW : public Adafruit_GFX
       }
       else
       {
-        epd2.writeImage(_buffer, 0, page_ys, WIDTH, gx_uint16_min(_page_height, HEIGHT - page_ys));
+        if (!_second_phase) epd2.writeImage(_buffer, 0, page_ys, WIDTH, gx_uint16_min(_page_height, HEIGHT - page_ys));
+        else epd2.writeImageAgain(_buffer, 0, page_ys, WIDTH, gx_uint16_min(_page_height, HEIGHT - page_ys));
         _current_page++;
         if (_current_page == _pages)
         {
@@ -271,7 +273,8 @@ class GxEPD2_BW : public Adafruit_GFX
               fillScreen(GxEPD_WHITE);
               drawCallback(pv);
               uint32_t offset = _reverse ? (_page_height - (dest_ye - dest_ys)) * _pw_w / 8 : 0;
-              epd2.writeImage(_buffer + offset, _pw_x, dest_ys, _pw_w, dest_ye - dest_ys);
+              if (phase == 1) epd2.writeImage(_buffer + offset, _pw_x, dest_ys, _pw_w, dest_ye - dest_ys);
+              else epd2.writeImageAgain(_buffer + offset, _pw_x, dest_ys, _pw_w, dest_ye - dest_ys);
             }
           }
           epd2.refresh(_pw_x, _pw_y, _pw_w, _pw_h);
@@ -297,7 +300,7 @@ class GxEPD2_BW : public Adafruit_GFX
             uint16_t page_ys = _current_page * _page_height;
             fillScreen(GxEPD_WHITE);
             drawCallback(pv);
-            epd2.writeImage(_buffer, 0, page_ys, WIDTH, gx_uint16_min(_page_height, HEIGHT - page_ys));
+            epd2.writeImageAgain(_buffer, 0, page_ys, WIDTH, gx_uint16_min(_page_height, HEIGHT - page_ys));
           }
           epd2.refresh(true);
         }
@@ -426,4 +429,3 @@ class GxEPD2_BW : public Adafruit_GFX
 };
 
 #endif
-

src/GxEPD2_EPD.cpp

@@ -1,7 +1,7 @@
 // Display Library for SPI e-paper panels from Dalian Good Display and boards from Waveshare.
 // Requires HW SPI and Adafruit_GFX. Caution: these e-papers require 3.3V supply AND data lines!
 //
-// based on Demo Example from Good Display: http://www.good-display.com/download_list/downloadcategoryid=34&isMode=false.html
+// based on Demo Example from Good Display: http://www.e-paper-display.com/download_list/downloadcategoryid=34&isMode=false.html
 //
 // Author: Jean-Marc Zingg
 //
@@ -175,5 +175,3 @@ void GxEPD2_EPD::_writeCommandDataPGM(const uint8_t* pCommandData, uint8_t datal
   if (_cs >= 0) digitalWrite(_cs, HIGH);
   SPI.endTransaction();
 }
-
-