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Particle Display Library for SPI E-Paper Displays
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README.md

GxEPD2_PP

Particle Display Library for SPI E-Paper Displays

  • With full Graphics and Text support using Adafruit_GFX (Adafruit_GFX_RK Version 1.3.5)

  • For SPI e-paper displays from Dalian Good Display

  • and SPI e-paper boards from Waveshare

important note :

  • the display panels are for 3.3V supply and 3.3V data lines
  • never connect data lines directly to 5V data pins.
  • the actual Waveshare display boards now have level converters and series regulator, safe for 5V

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 Particle Community Forum Topic:

Supporting Arduino Forum Topics:

Note on documentation

  • GxEPD2 uses Adafruit_GFX for Graphics and Text support, which is well documented there
  • GxEPD2 uses meaningful method names, and has some comments in the header files
  • consult the header files GxEPD2_BW.h, GxEPD2_3C.h and GxEPD2_GFX.h
  • for the concept of paged drawing and picture loop see:
  • https://github.com/olikraus/u8glib/wiki/tpictureloop

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
  • GDEH0213B72 2.13" b/w, replacement for GDE0213B1
  • 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

other supported panels

  • ED060SCT 6" grey levels, on Waveshare e-Paper IT8951 Driver HAT

Version 1.1.0+

  • added GxEPD2_PP_WiFi_Example, for bitmap download from web
  • only download from http: works, would need help for https:
  • only on GitHub, to avoid the need to increase the version for publish
  • this is preliminary!

Version 1.1.0

  • corresponds to GxEPD2 Version 1.1.6
  • added support for GDEH0213B72 2.13" b/w, replacement for GDE0213B1

Version 1.0.9

  • 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 1.0.8

  • retired, wrong dependency in GxEPD2_PP_Example

Version 1.0.7

  • fix drawImage(...) overloaded methods signature matching abiguity
  • preliminary version

Version 1.0.6

  • preliminary version
  • based on GxEPD2 Version 1.1.0
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