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Arduino Display Library for SPI E-Paper Displays
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ZinggJM Version 1.1.4+
- added GxEPD2_WS_ESP32_Driver example for Waveshare ESP32 Driver Board
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examples Version 1.1.4+ Mar 6, 2019
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src Version 1.1.4 Feb 10, 2019
CONTRIBUTING.md
ConnectingHardware.md Version 1.1.2 Jan 16, 2019
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README.md
issue_template.md initial release version 1.0.2 Jul 9, 2018
library.properties Version 1.1.4 Feb 10, 2019

README.md

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)
  • 4k7/10k resistor divider may not work with flat cable extensions or Waveshare 4.2 board, use level converter then
  • 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
  • buffer size can be selected in the application by template parameter page_height, see GxEPD2_Example
  • Paged drawing is implemented as picture loop, like in U8G2 (Oliver Kraus)
  • see https://github.com/olikraus/u8glib/wiki/tpictureloop
  • Paged drawing is also available using drawPaged() and drawCallback(), like in GxEPD
  • // GxEPD style paged drawing; drawCallback() is called as many times as needed
  • void drawPaged(void (*drawCallback)(const void*), const void* pv)
  • paged drawing is done using Adafruit_GFX methods inside picture loop or drawCallback

Full Screen Buffer Support

  • full screen buffer is selected by setting template parameter page_height to display height
  • drawing to full screen buffer is done using Adafruit_GFX methods without picture loop or drawCallback
  • and then calling method display()

Low Level Bitmap Drawing Support

  • bitmap drawing support to the controller memory and screen is available:
  • either through the template class instance methods that forward calls to the base display class
  • or directly using an instance of a base display class and calling its methods directly

Supporting Arduino Forum Topics:

Supported SPI e-paper panels from Good Display:

  • GDEP015OC1 1.54" b/w
  • GDEW0154Z04 1.54" b/w/r 200x200
  • GDE0213B1 2.13" b/w
  • GDEW0213I5F 2.13" b/w flexible
  • GDEW0213Z16 2.13" b/w/r
  • GDEH029A1 2.9" b/w
  • GDEW029T5 2.9" b/w
  • GDEW029Z10 2.9" b/w/r
  • GDEW027C44 2.7" b/w/r
  • GDEW027W3 2.7" b/w
  • GDEW042T2 4.2" b/w
  • GDEW042Z15 4.2" b/w/r
  • GDEW0583T7 5.83" b/w
  • GDEW075T8 7.5" b/w
  • GDEW075Z09 7.5" b/w/r

Supported SPI e-paper panels & boards from Waveshare: compare with Good Display, same panel

Version 1.1.4+

  • added GxEPD2_WS_ESP32_Driver example for Waveshare ESP32 Driver Board

Version 1.1.4

  • eliminated double refresh for "fast partial update"
  • moved wavetables to the driver classes
  • added one explicit drawImage(...) and writeImage(...) method (for removed default paramter values for 1.1.3)
  • added init method with added parameter initial, for re-init after processor deep sleep wakeup
  • added init parameter pulldown_rst_mode, for special RST handling (not needed for waveshare shield)

Version 1.1.3

  • fixed wavetables for GDEW029T5 and GDEW0213I5F
  • fixed drawImage(...) overloaded methods signature matching ambiguity

Version 1.1.2

  • added support for GDEW029T5
  • fixed (added) clipping for partial window
  • fixed (added) powerOff() after full update (partial update keeps power on)
  • added hibernate() for minimum power use by displays that support it

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

  • add GxEPD2_U8G2_Fonts_Example, e.g. for use of Umlauts ÄÖÜäéöü
  • NOTE: you need to SAVE the modified example to a saveable location for UTF-8 characters to work

Version 1.0.8

  • add GxEPD2_SD_AVR_boards_added.h to GxEPD2_SD_AVR_Example
  • with example definitions for non-AVR boards (low level display class use example)

Version 1.0.7

  • add GxEPD2_boards_added.h to GxEPD2_Example
  • with example definitions for Arduino DUE and MKR1000

Version 1.0.6

  • add buffered drawing option to GxEPD2_WiFi_Example
  • allows use with 1.54" 3-color 200x200 display, may also be useful for small bitmaps

Version 1.0.5

  • add buffered drawing option to GxEPD2_SD_Example and GxEPD2_Spiffs_Example
  • allows use with 1.54" 3-color 200x200 display, may also be useful for small bitmaps

Version 1.0.4

  • add GxEPD2_GFX base class support (optional, selectable, uses slightly more code)
  • base class GxEPD2_GFX can be used to pass references or pointers to the display instance as parameter
  • add GxEPD2_GFX_MultiDisplayExample, uses GxEPD2_GFX reference parameter
  • modify GxEPD2_MultiDisplayExample for ESP8266 (template issue: class expected instead of typename)

Version 1.0.3

  • fix GxEPD2_SD_Example & GxEPD2_SD_AVR_Example
  • add GxEPD2_MultiDisplayExample (preliminary version)

Version 1.0.2

  • initial release version 1.0.2
  • tested with ESP8266, ESP32, STM32F103C8T6, AVR Arduino (Pro Mini 3.3V)
  • 1.54" 3-color GxEPD2_154c can be used with paging for AVR
  • wave tables in program space, 4.2" b/w can be used with GxEPD2_SD_AVR_Example
  • issues enabled and welcome, please use Forum Topic for enhancement suggestions

Version 1.0.1

  • pre-release test version
  • GxEPD2_SD_AVR_Example added, has no graphics buffer to reduce RAM usage (base display class use)
  • issues disabled so far, use Arduino Forum Topics instead
  • in this version 1.54" 3-color GxEPD2_154c can only be used with full size buffer (or with no buffer base display class)

Version 1.0.0

  • preliminary version, under construction
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