zGxEPD2

GxEPD2

New Simplified Version of GxEPD for Arduino

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 data pins.

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 directy using an instance of a base display class and calling its methods directly

Supporting Arduino Forum Topics:

• 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 1.0.9

• 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