zGxEPD2

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 having the same panels

important note:

• the display panels 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
• the actual Waveshare display boards now have level converters and series regulator, safe for 5V
• use 3k3 pull-down on SS for ESP8266 for boards with level converters
• note that 7.5" e-paper displays don't work reliable if fed from 3.3V Arduino pin
• note that Waveshare boards with "clever" reset circuit may need shortened reset pulse
• use init(115200, true, 2, false) for Waveshare boards with "clever" reset circuit
• note that Waveshare boards with "clever" reset circuit need 1k pull-up on RST on ESP8266, or different pin
• note that the new Waveshare Universal e-Paper Raw Panel Driver HAT Rev 2.3 needs PWR connected to VCC or driven HIGH
• see https://www.waveshare.com/wiki/E-Paper_Driver_HAT
• some new Waveshare boards also have a PWR control pin, needs be pulled hight

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 can either be done using Adafruit_GFX methods without picture loop or drawCallback
• and then calling method display()
• or by still using the page loop or drawCallback

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:

• Waveshare e-paper displays with SPI: http://forum.arduino.cc/index.php?topic=487007.0
• Good Display ePaper for Arduino : https://forum.arduino.cc/index.php?topic=436411.0
• Note that these topics are closed. Use only for reference.
• The Arduino Forum is no longer watched and answered by the Author.
• New questions or issues should be posted on https://github.com/ZinggJM/GxEPD2/discussions

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

Note on issues and pull requests

• issues should be reported in https://github.com/ZinggJM/GxEPD2/discussions.
• issues on GitHub are disabled; there were too many false issues.
• pull requests are not welcome, will not be merged.
• pull requests can't be disabled, but will be closed.
• please place information about interesting fork additions in https://github.com/ZinggJM/GxEPD2/discussions.

Supported SPI e-paper panels from Good Display:

• GDEW0102T4 1.02" b/w 80x128, UC8175
• DEPG0150BN 1.50" b/w 200x200, SSD1681, e.g. LILYGO® TTGO T5 V2.4.1 1.50 inch
• GDEP015OC1 1.54" b/w 200x200, IL3829, no longer available
• GDEH0154D67 1.54" b/w 200x200, SSD1681, replacement for GDEP015OC1
• GDEW0154T8 1.54" b/w 152x152, UC8151 (IL0373)
• GDEW0154M09 1.54" b/w 200x200, JD79653A
• GDEW0154M10 1.54" b/w 152x152, UC8151D, DES
• GDEY0154D67 1.54" b/w 200x200, SSD1681
• GDEW0154Z04 1.54" b/w/r 200x200, IL0376F, no longer available
• GDEH0154Z90 1.54" b/w/r 200x200, SSD1681, replacement for GDEW0154Z04
• GDEM0154F51H 1.54" 4-color 200x200, JD79660
• GDE0213B1 2.13" b/w 122x250, IL3895, phased out
• GDEH0213B72 2.13" b/w 122x250, SSD1675A (IL3897), replacement for GDE0213B1
• GDEH0213B73 2.13" b/w 122x250, SSD1675B, new replacement for GDE0213B1, GDEH0213B72
• GDEM0213B74 2.13" b/w 122x250, SSD1680
• GDEW0213I5F 2.13" b/w 104x212, UC8151 (IL0373), flexible
• GDEW0213T5D 2.13" b/w 104x212, UC8151 (IL0373)
• GDEW0213M21 2.13" b/w 104x212, UC8151 (IL0373), DES
• GDEW0213Z16 2.13" b/w/r 104x212, UC8151 (IL0373)
• GDEW0213Z19 2.13" b/w/r 104x212, UC8151D
• GDEY0213Z98 2.13" b/w/r 122x250, SSD1680
• GDEY0213F51 2.13" 4-color 122x250, JD79661
• DEPG0213BN 2.13" b/w 122x250, SSD1680, e.g. LILYGO® TTGO T5 V2.3.1 2.13 inch
• GDEY0213B74 2.13" b/w 122x250, SSD1680
• GDEW026T0 2.6" b/w 152x296, UC8151 (IL0373)
• GDEW026M01 2.6" b/w 152x296, UC8151 (IL0373), DES
• DEPG0266BN 2.66" b/w 152x296, SSD1680, e.g. LILYGO® TTGO T5 2.66 inch
• GDEY0266Z90 2.66" b/w/r 152x296, SSD1680
• GDEY0266F51H 2.66" 4-color 184x460, JD79667
• GDEW027C44 2.7" b/w/r 176x264, IL91874
• GDEW027W3 2.7" b/w 176x264, EK79652 (IL91874)
• GDEY027T91 2.7" b/w 176x264, SSD1680
• GDEH029A1 2.9" b/w 128x296, SSD1608 (IL3820)
• GDEW029T5 2.9" b/w 128x296, UC8151 (IL0373)
• GDEW029T5D 2.9" b/w 128x296, UC8151D
• GDEW029I6FD 2.9" b/w 128x296, UC8151D, flexible
• GDEM029T94 2.9" b/w 128x296, SSD1680
• GDEW029M06 2.9" b/w 128x296, UC8151D, DES
• GDEW029Z10 2.9" b/w/r 128x296, UC8151 (IL0373)
• GDEH029Z13 2.9" b/w/r 128x296, UC8151D
• GDEM029C90 2.9" b/w/y 128x296, SSD1680
• DEPG0290BS 2.9" b/w 128x296, SSD1680, e.g. LILYGO® TTGO T5 V2.4.1 2.9"
• GDEY029T94 2.9" b/w 128x296, SSD1680
• GDEY029T71H 2.9" b/w 168x384, SSD1685
• GDEY029F51H 2.9" 4-color 168x384, JD79667
• GDEY029F51 2.9" b/w/r/y 128x296, JD79667
• Waveshare3inch4color 3.0" 4-color 168x400
• GDEQ031T10 3.1" b/w 240x320, UC8253
• GDEM035F51 3.5" 4-color 184x384, JD79667
• GDEY037T03 3.7" b/w 240x416, UC8253
• ED037TC1 3.7" b/w 280x480, SSD1677, Waveshare 3.7"
• GDEW0371W7 3.7" b/w 240x416, UC8171 (IL0324)
• GDEM0397T81 3.97" b/w 480x800, SSD1677
• GDEM0397F81 3.97" 4-color, 800x480, SSD2677
• GDEW042T2 4.2" b/w 400x300, UC8176 (IL0398)
• GDEW042M01 4.2" b/w 400x300, UC8176 (IL0398), DES
• GDEW042Z15 4.2" b/w/r 400x300, UC8176 (IL0398)
• GDEQ042Z21 4.2" b/w/r 400x300, UC8276, (Waveshare V2)
• GDEY042Z98 4.2" b/w/r 400x300, SSD1683
• GDEY042T81 4.2" b/w 400x300, SSD1683
• GDEY0420F51 4.2" 4-color 400x300, HX8717
• GDEQ0426T82 4.26" b/w 800x480, SSD1677
• Waveshare437inch4color Waveshare 4.37" 4-color e-paper display 512x368
• ACeP565 5.65" Waveshare 5.65" 7-color e-paper display 600x448
• GDEP0565D90 5.65" 7-color 600x448
• GDEH0576T81 5.76" b/w 920x680, SSD2677
• GDEY0579T93 5.79" b/w 792x272, SSD1683
• GDEY0579Z93 5.79" b/w/r 792x272, SSD1683
• GDEY0579F51 5.79" 4-color 792x272, HX8717
• GDEW0583T7 5.83" b/w 600x448, UC8159c (IL0371)
• GDEW0583T8 5.83" b/w 648x480, EK79655 (GD7965)
• GDEW0583Z83 5.83" b/w/r 648x480, EK79655 (GD7965)
• GDEQ0583T31 5.83" b/w 648x480, UC8179
• GDEQ0583Z31 5.83" b/w/r 648x480, UC8179C
• GDEY073D46 7.3" 800x480 7-color
• GDEP073E01 7.3" 800x480 7-color
• ACeP730 7.3" Waveshare 7-color e-paper display 800x480, PhotoPainter
• GDEW075T8 7.5" b/w 640x384, UC8159c (IL0371)
• GDEW075T7 7.5" b/w 800x480, EK79655 (GD7965)
• GDEY075T7 7.5" b/w 800x480, UC8179 (GD7965)
• GDEW075Z09 7.5" b/w/r 640x384, UC8159c (IL0371)
• GDEW075Z08 7.5" b/w/r 800x480, EK79655 (GD7965)
• GDEY075Z08 7.5" b/w/r 800x480, UC8179
• GDEH075Z90 7.5" b/w/r 880x528, SSD1677
• GDEM075F52 7.5" 4-color, 800x480, JD79665AA
• GDEM102T91 10.2" b/w 960x640, SSD1677
• GDEM1085T51 10.85 b/w 1360x480, JD79686AB
• GDEH116T91 11.6" b/w 960x640, SSD1677
• GDEY116Z91 11.6" b/w/r 960x640, SSD1677
• GDEY116F51 11.6" 4-color 960x640, SSD2677
• GDEW1248T3 12.48" b/w 1304x984, UC8179
• GDEY1248Z51 12.48" b/w/r 1304x984, UC8179
• GDEM133T91 13.3" b/w 960x680, SSD1677

• GDEM133Z91 13.3" b/w/r 960x680, SSD1677

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

  other supported panels

• GYE042A87 4.2" b/w 400x300, SSD1683 (HINK-E042-A07-FPC-A1)

• SE0420NQ04 4.2" b/w 400x300, UC8276C (OPM042A2_V1.0)

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

• ED060KC1 6" grey levels, 1448x1072, on Waveshare e-Paper IT8951 Driver HAT

• ED078KC2 7.8" grey levels, 1872x1404, on Waveshare e-Paper IT8951 Driver HAT

• ES103TC1 10.3" grey levels, 1872x1404, on Waveshare e-Paper IT8951 Driver HAT

I can and will only support e-paper panels I have!

• I accept panel donations to add support to GxEPD2 only on exception.
• I support only panels from known sources that are well documented.
• Let me know about interesting panels that fall into this category.
• I occasionally buy new panels, but adding support will take as much time as needed.

Version 1.6.9

• added support for GDEH0576T81, 5.76" b/w 920x680, SSD2677
• the GDEH0576T81 has partial window addressing and partial window refresh
• the controller SSD2677 of GDEH0576T81 supports differential refresh with bit interleaved old/new per pixel
• the driver GxEPD2_576_GDEH0576T81 supports differential refresh through writeNative with previous/current bitmaps
• the new display class GxEPD2_BW_SHM supports GxEPD2 style fast partial update with a shadow buffer for previous
• the display class GxEPD2_BW_SHM uses a "malloc" allocated shadow buffer on processors with enough heap space
• class GxEPD2_BW_SHM falls back to GxEPD2_BW behavior if "malloc" fails, which results in full refresh on GDEH0576T81

• fixed controller name of GDEM0397T81 to SSD1677

  Version 1.6.8

• added methods writeImageToPrevious and writeImagePartToPrevious to b/w driver classes

• added partial update support to GDEP073E01

• added partial window addressing to GDEY073D46, partial refresh not usable

  Version 1.6.7

• added support for GDEW075Z08 fast b/w refresh in new class GxEPD2_750c_GDEW075Z08

• GxEPD2_750c_GDEW075Z08 uses a b/w waveform written to registers, none available in OTP

• added support for GDEY075Z08 fast b/w refresh in new class GxEPD2_750c_GDEY075Z08

• GxEPD2_750c_GDEY075Z08 uses a b/w waveform written to registers, OTP version is faulty

• GDEW075Z08 and GDEY075Z08 both have distortion on borders between black and white

• therefore narrow or small fonts are barely readable with fast b/w refresh

• renamed method writeImagePrevious to writeImageToPrevious

• renamed method writeImageNew to writeImageToCurrent

  Version 1.6.6

• added support for GDEM0154F51H, 1.54" 4-color 200x200, JD79660

• added support for GDEM035F51, 3.5" 4-color 184x384, JD79667

• added support for GDEM0397F81, 3.97" 4-color, 800x480, SSD2677

• added support for GDEM075F52, 7.5" 4-color, 800x480, JD79665AA

• added method writeImageToPrevious to class GxEPD2_750_GDEY075T7 and nextPageToPrevious to GxEPD2_BW

• renamed class GxEPD2_0579c_GDEY0579F51 to GxEPD2_579c_GDEY0579F51

  Version 1.6.5

• added support for GDEM0397T81, 3.97" b/w 480x800, SSD1677

• fixed GxEPD2_290_T94 partial refresh

  Version 1.6.4

• added support for GDEY037T03 3.7" b/w 240x416, UC8253

  Version 1.6.3

• updated GxEPD2_4C.h with WIDTH_VISIBLE (for GDEY0213F51)

• updated GxEPD2_154_Z90c.cpp powerOff() handling

• updated powerOff() handling for other 3-color displays

  Version 1.6.2

• fixed support for GDEY029T71H 2.9" b/w 168x384, SSD1685

• GxEPD2_WiFi_Example: added direct (non-buffered) BMP download to 7-color displays

• some minor fixes

  Version 1.6.1

• fixed and updated GxEPD2_WiFi_Example

  Version 1.6.0

• updated support for GDEY029T94: fixed a partial refresh issue

• updated support for GDEY042T81: fixed fast full refresh for 2024 panel version

• updated support for GDEP073E01: fixed color mapping for its native color values

• updated GxEPD2_display_selection_new_style.h: added Arduino Nano Every, Arduino Nano ESP32, Arduino Nano IoT.

  Version 1.5.9

• added Power Save command (PWS) to GDEY075T7 init (issue with dithered bitmaps)

• added support for GDEY0579T93 5.79" b/w 792x272, SSD1683

• added support for GDEY0579Z93 5.79" b/w/r 792x272, SSD1683

• added support for GDEY0579F51 5.79" 4-color 792x272, HX8717

• the GDEY0579F51 has partial window addressing capability,

• but of little use, because the controller buffer is modified during refresh

• partial window refresh can't be used on GDEY0579F51, refresh is full screen

• added support for GDEY042Z98 4.2" b/w/r 400x300, SSD1683

• GDEY042Z98 has "fast" full refresh and supports fast b/w partial refresh

• added support for GDEP073E01 7.3" 800x480 7-color

  Version 1.5.8

• added support for GDEP0565D90 5.65" 7-color 600x448

• added support for GDEY116F51 11.6" 4-color 960x640, SSD2677

• added support for GDEY029T71H 2.9" b/w 168x384, SSD1685

  Version 1.5.7

• added support for GDEY0213F51 2.13" 4-color 122x250, JD79661

• added support for GDEM1085T51 10.85 b/w 1360x480, JD79686AB

  Version 1.5.6

• version for ongoing fixes and additions

• added support for GYE042A87 4.2" b/w 400x300

• added support for SE0420NQ04 4.2" b/w 400x300

• added support for GDEQ0583Z31 5.83" b/w/r 648x480

• added support for GDEM102T91 10.2" b/w 960x640, SSD1677

• added support for GDEY116Z91 11.6" b/w/r 960x640, SSD1677

• added support for GDEM133T91 13.3" b/w 960x680, SSD1677

• added support for GDEM133Z91 13.3" b/w/r 960x680, SSD1677

• improved differential refresh for SE0420NQ04

• improved full refresh for SE0420NQ04

• fixed driver class GxEPD2_213.cpp

  Version 1.5.5

• updated 7-color driver classes (design cleanup fixed)

• note: Waveshare PhotoPainter doesn't work with MBED Pico package

• note: use package https://github.com/earlephilhower/arduino-pico for PhotoPainter

  Version 1.5.4

• added support for GDEQ031T10 3.1" b/w 240x320

• updated support for GDEY075T7 7.5" b/w 800x480

• renamed driver class GxEPD2_750_YT7 to GxEPD2_750_GDEY075T7

• the actual GDEY075T7 panels have fast full refresh capability

• added support for Waveshare 7.3" 7-color, driver class GxEPD2_730c_ACeP_730

• added support for Waveshare 7.3" 7-color PhotoPainter with RPi Pico RP2040

• updated b/w driver classes for SSD controllers

• updated 7-color driver classes (design cleanup)

  Version 1.5.3

• added support for GDEQ0426T82 4.26" b/w 800x480

• added support for GDEY0266F51H 2.66" 4-color 184x460

• added support for GDEY029F51H 2.9" 4-color 168x384

• added support for GDEY0420F51 4.2" 4-color 400x300

• added support for Waveshare 3.00" 4-color e-paper display 168x400

• updated support for Waveshare 4.37" 4-color e-paper display 512x368

• the 4-color displays have partial window addressing and refresh

• renamed GDEY042T91 to its new official name GDEY042T81

  Version 1.5.2

• added support for Waveshare 4.37" 4-color e-paper display 512x368

• fixed __has_include test (for packages that don't support __has_include)

• added WIDTH_VISIBLE for correct graphics width for 2.13" b/w 122x250

• added end() method, to release SPI and reset all pins to INPUT

  Version 1.5.1

• added support for GDEY0154D67 1.54" b/w 200x200

• added support for GDEY0213B74 2.13" b/w 128x250

• updated support for GDEY027T91 2.7" b/w 176x264

• renamed driver class for GDEY027T91 to GxEPD2_270_GDEY027T91

• added support for GDEY029T94 2.9" b/w 128x296

• added support for GDEY042T91 4.2" b/w 400x300

• added support for GDEQ0583T31 5.83" b/w 648x480

• these panels have fast full refresh capability

• fast full refresh can be disabled in the class header for low temperature use

• added support for GDEY073D46 7.3" 800x480 7-color

• all these new panels have been donated by Good Display

• added __has_include test to GxEPD2_BW.h, GxEPD2_3C.h, GxEPD2_7C

• this allows to remove or put aside unused driver classes for faster compile

• several fixes and improvements

  Version 1.5.0

• added support for GDEY075T7 7.5" b/w 800x480

• updated GxEPD2_Example, added HSPI use for Waveshare ESP32 Driver Board

• updated GxEPD2_SD_AVR_Example, fixes for BMP handling

• updated GxEPD2_SD_Example, fixes for BMP handling, added HSPI use for Waveshare ESP32 Driver Board

• updated GxEPD2_SerialFlash_Example, fixes for BMP handling

• updated GxEPD2_SerialFlash_Loader, updated https certificates and use

• updated GxEPD2_Spiffs_Example, fixes for BMP handling

• updated GxEPD2_Spiffs_Loader, updated https certificates and use

• added GxEPD2_WiFi_CertStore_Example, use of a BearSSL CertStore on ESP8266, like a browser

• added GxEPD2_WiFi_CertStore_Loader, download root certificates (from Mozilla) to ESP8266 flash

• updated GxEPD2_WiFi_Example, fixes for BMP handling, updated https certificates and use

• updated GxEPD2_WS_ESP32_Driver, added HSPI use for Waveshare ESP32 Driver Board

  Version 1.4.9

• added missing constructor lines to GxEPD2_display_selection.h

• added panel details to comments in GxEPD2_display_selection.h

• added panel details to Supported SPI e-paper panels in README.md

  Version 1.4.8

• added support for GDEY027T91 2.7" b/w 176x264

• added support for GDEY1248Z51 12.48" b/w/r 1304x984

• fixed name of panel DEPG0150BN

• updated certificate and fingerprint for GitHub download in GxEPD2_WiFi_Example

  Version 1.4.7

• added support for DEPG0150BN 1.50" b/w 200x200, e.g. LILYGO® TTGO T5 V2.4.1 1.50 inch

• added support for DEPG0213BN 2.13" b/w 128x250, e.g. LILYGO® TTGO T5 V2.3.1 2.13 inch

• added support for DEPG0266BN 2.66" b/w 152x296, e.g. LILYGO® TTGO T5 2.66 inch

• added support for DEPG0290BS 2.9" b/w 128x296, e.g. LILYGO® TTGO T5 V2.4.1 2.9"

• added support for ES103TC1 10.3" grey levels, 1872x1404, on Waveshare e-Paper IT8951 Driver HAT

  Version 1.4.6

• added support for GDEY0266Z90 2.66" b/w/r 152x296

• added support for GDEW0583Z83 5.83" b/w/r 648x460

  Version 1.4.5

• added support for GDEY0213Z98 2.13" b/w/r 122x250

• tested with LOLIN 2.13" Tri-Color eInk / ePaper 250x122 Display Shield

• https://www.aliexpress.com/item/1005003020667903.html

  Version 1.4.4

• interim update to solve compiler warnings (ALL for GCC for AVR)

  Version 1.4.3

• added option to select an alternate HW SPI channel and/or SPI settings

• by method selectSPI(SPIClass& spi, SPISettings spi_settings) of driver base class GxEPD2_EPD

• by calling selectSPI before calling init() of display class

• or by calling extended init() method that has these parameters added

• tested with RPi Pico RP2040 using Good Display DESPI-PICO connection shield

• updated GxEPD2_Example to show use with DESPI-PICO

• DESPI-PICO: see https://www.good-display.com/product/393.html

  Version 1.4.2

• added support for Waveshare 3.7" b/w board and panel ED037TC1

• waveform tables for ED037TC1 are taken unmodified from Waveshare demo code

• refresh behavior with ED037TC1 with GxEPD2 is not perfect, could not be resolved

• ISSUE RESOLVED: RESE needs to be 3 ohms on DESPI-C02 for this panel, Waveshare schematics is wrong

• added differential refresh for GDEH116T91, waveform table taken from ED037TC1

• differential refresh for GDEH116T91 looks ok; can be disabled with hasFastPartialUpdate = false

• increased sustain phase for differential refresh on GDEW042T2

  Version 1.4.1

• fix for Waveshare "clever" reset circuit: power controller before reset pulse

  Version 1.4.0

• changed the default reset duration to 10ms instead of 20ms

• changed the delay after reset to 10ms or reset duration, whichever is higher, instead of 200ms

• added a busyCallback feature, to allow to service periodic actions during wait for BUSY termination

• // register a callback function to be called during _waitWhileBusy continuously.

• void setBusyCallback(void (*busyCallback)(const void*), const void* busy_callback_parameter = 0);

• added example GxEPD2_RotaryUsingBusyCallback.ino

  Version 1.3.9

• fix for STM32 official package pin number range (int16_t)

• fix for refresh(int16_t x, int16_t y, int16_t w, int16_t h) methods screen intersection

  Version 1.3.8

• added support for GDEQ042Z21 4.2" b/w/r 400x300 panel or Waveshare 4.2" V2 b/w/r board

• the Waveshare 4.2" V2 b/w/r board requires the shortened reset pulse

• added support for GDEW029I6FD 2.9" b/w 128x296 flexible board

• some fixes and improvement for the new style panel selection

  Version 1.3.7

• added support for GDEW0102T4 1.02" b/w 80x128 panel or Waveshare 1.02" b/w board

• the GDEW0102T4 panel has a different connector than the other SPI panels

• the GDEW0102T4 panel can be used with the DESPI-C102 connection module

• https://buy-lcd.com/products/connection-board-demo-kit-for-102-inch-e-ink-display-despi-c102

• my test have been done with the Waveshare 1.02" b/w board

  Version 1.3.6

• added support for Waveshare 2.9" b/w V2, driver class GxEPD2_290_T94_V2

• Waveshare 2.9" b/w V2 uses a GDEM029T94 variant without partial update wft in OTP

• driver class GxEPD2_290_T94_V2 uses partial update wft written to registers

• added NOTE for RST pull-up on ESP8266 with "clever" reset circuit, or alternate pin

  Version 1.3.5

• added support for GDEM0213B74 122x250 b/w e-paper panel

• added support for ED078KC2, 7.8" grey levels, 1872x1404, on Waveshare e-Paper IT8951 Driver HAT

  Version 1.3.4

• added support for GDEH116T91 960x640 b/w e-paper panel

• GDEH116T91 has only full screen refresh, no wavetable for differential refresh yet

• added support for processor Arduino Nano RP2040 Connect to the examples

• added general fast b/w refresh for capable 3-color displays GDEW0213Z19, GDEW029Z13

• added example GxEPD2x_FastBlackWhiteOnColor.ino for GDEW0213Z19, GDEW029Z13

• evaluation of other fast b/w capable 3-color panels may follow

  Version 1.3.3

• added b/w differential refresh method to GDEW0213Z19

• added b/w differential refresh method to GDEW029Z13

• up to 100 b/w fast refreshes have been possible (resulting in slightly reddish background)

• added experimental example GxEPD2x_MixedTest for proof of concept

• GxEPD2x_MixedTest needs enough RAM for 2 GFXCanvas1 objects

• general 3-color mixed refresh in GxEPD2 is in evaluation, for capable panels

  Version 1.3.2

• added support for GDEW0213T5D 104x212 b/w e-paper panel

• added support for GDEW029T5D 128x296 b/w e-paper panel

• added support for GDEW0213Z19 104x212 b/w/r e-paper panel

• added support for GDEW029Z13 128x296 b/w/r e-paper panel

• both GDEW0213Z19 and GDEW029Z13 support only full screen refresh (controller issue)

  Version 1.3.1

• added support for GDEM029C90 128x296 b/w/y e-paper panel

• GDEM029C90 has a very long refresh time of about 27 seconds

• GDEM029C90 has partial update (window addressing) of controller memory

• GDEM029C90 supports only full refresh of screen

  Version 1.3.0

• added support for GDEM029T94 128x296 b/w e-paper panel

• added support for GDEW026M01 152x296 b/w new DES e-paper panel

• the new GDEW026M01 DES b/w e-paper panel has higher contrast and wide temperature range

• differential refresh (fast partial update) is supported for normal temperature range

• disable differential refresh for extended temperatures by setting hasFastPartialUpdate = false;

• the differential waveform table for GDEW026M01 is experimental and may need improvement

• major update of display selection in the examples to make additions easier:

• old style selection is now in separate include files GxEPD2_display_selection.h

• and GxEPD2_display_selection_added.h

• added new style display selection in include file GxEPD2_display_selection_new_style.h

• either selection style can be used. old style is intended for easy copying of constructor lines.

  Version 1.2.16

• fix for GDEH0154D67, to work independent of OTP version (ping-pong issue)

  Version 1.2.15

• added support for GDEW0213M21 2.13" 104x212 b/w new DES e-paper panel

• added support for GDEW029M06 2.9" 128x296 b/w new DES e-paper panel

• added support for GDEW042M01 4.2" 400x300 b/w new DES e-paper panel

• these new DES b/w e-paper panels have higher contrast and wide temperature range

• differential refresh (fast partial update) is supported for normal temperature range

• disable differential refresh for extended temperatures by setting hasFastPartialUpdate = false;

• the GDEW042M01 I have is a preliminary version, differential waveform may need update

  Version 1.2.14

• added support for 6" 1448x1072 ED060KC1 on Waveshare e-Paper IT8951 Driver HAT

• fixed GxEPD2_WiFi_Example.ino: new GitHub fingerprint for ESP8266, certificate for ESP32

• fixed color discriminator for 7-color display in GxEPD2_7C.h

• added multicolor support for 7-color display in GxEPD2_WiFi_Example, GxEPD2_Spiffs_Example,

• and GxEPD2_SD_Example, GxEPD2_SerialFlash_Example

• fixed paged write to 7-color display controller (transaction and CS handling issue)

• some more fixes

  Version 1.2.13

• added support for GDEH0154Z90 1.54" 200x200 b/w/r, replacement for GDEW0154Z04

• GDEH0154Z90 has partial window addressing, but no partial window refresh

• added some missing constructor examples, e.g. for IT8951 Driver HAT on Due

• cleaned-up wiring information in the examples

  Version 1.2.12

• fixed GxEPD2_MinimumExample.ino to draw black on white (white on white was invisible)

• added example GxEPD2_HelloWorld.ino

• updated wiring info and constructor parameters for the actual Waveshare e-Paper ESP8266 Driver Board

• added some missing explicit initializers (nobody noticed as compilers usually initialize simple members)

  Version 1.2.11

• added support for Waveshare 5.65" 7-color e-paper display 600x448

• the unknown controller of this display doesn't support partial update, as far as known

• 7-color graphics support is available with class GxEPD2_7C

• 7-color graphics support requires paging even on ESP32

• 7-color graphics support causes heavy paging on Arduino UNO, gets very slow

• refresh is quite fast for a color e-paper display: 12 seconds

  Version 1.2.10

• added support for GDEH075Z90 7.5" b/w/r 880x528

• the controller of GDEH075Z90 supports partial update, but refesh is full screen

• the controller of GDEH075Z90 doesn't support differential update (not possible on 3-color anyway)

• note: the connector of the GDEH075Z90 is mirrored; connects downward on DESPI-C02

• added optional init parameter "reset_duration" in ms, same default 20ms as before

• reset_duration = 2 may help with "clever" reset circuit of newer boards from Waveshare

  Version 1.2.9

• added support for GDEW0154T8 1.54" b/w 152x152

• added support for GDEW0154M09 1.54" b/w 200x200

• added support for GDEW0154M10 1.54" b/w 152x152 DES

• added support for GDEW0583T8 5.83" b/w 648x460

• added option to use class GFX of library GFX_Root instead of Adafruit_GFX

• differential update on GDEW0154M10 is experimental, there is no partial update demo yet

  Version 1.2.8

• improved transfer speed for the bigger displays (3.71" and up)

  Version 1.2.7

• fix paged drawing of initial screen on GDEH029A1

• sometimes true is false, if applied the wrong way round

  Version 1.2.6

• slightly improved differential refresh for GDEW1248T3

• minor fixes

  Version 1.2.5

• added support for GDEW1248T3 12.84" b/w panel on Waveshare 12.48 e-paper display frame

• tested with Waveshare Epaper ESP32 Driver Board mounted on connection board

• tested with Arduino UNO mounted on connection board, is extremely slow

• doesn't work with Arduino MEGA on connection board with switch set to ICSP and pins bent out of way, reason unknown

• not tested with other processors

• caution: wiring connector is on 5V side of level converters!

  Version 1.2.4

• added support for GDEH0154D67 1.54" b/w, replacement for GDEP015OC1

• added GxEPD2_SerialFlash_Loader, WiFi bitmap downloader for SPI-flash

• added GxEPD2_SerialFlash_Example, SPI-flash example, e.g. for Winbond 25Q16BVSIG

• minor fixes and comment cleanups

• fix refresh(false) in upper layer: add powerOff() after full refresh

  Version 1.2.3

• fixed partial update for 2.13" 3-color and 2.9" 3-color e-paper

• partial update can be disabled with attribute usePartialUpdateWindow = false

• added GxEPD2_GFX_Example to show uses of GxEPD2_GFX base class

• replaced GxEPD2_MultiDisplayExample code, same code as GxEPD2_GFX_MultiDisplayExample

• added extras/examples/GxEPD2_T_MultiDisplayExample, alternate example using template functions

• major and minor fixes, such as typos that survived too long

  Version 1.2.2

• fixed BMP handling, e.g. for BMPs created by ImageMagick

• see also Arduino Forum Topic https://forum.arduino.cc/index.php?topic=642343.0

  Version 1.2.1

• added support for GDEW075T7 7.5" b/w 800x480

• GDEW075T7 has differential update (1.6s) using a charge balancing waveform

• added optional SW SPI support, see /extras/sw_spi/README

• added /extras/tests/GxEPD2_RefreshTests/GxEPD2_RefreshTests.ino, for waveform tuning

• minor fixes

• note that 7.5" e-paper displays don't work reliable if fed from 3.3V Arduino pin

  Version 1.2.0

• added "fast partial update" (differential update) for GDEW0371W7 3.7" b/w 240x416

• improved differential update waveform for GDEW026T0 2.6" b/w 152x256

• fixed init code & improved differential update for GDEW042T2 4.2" b/w 300x400

• note that all differential refresh waveforms are a compromise (ghosting, big font use)

• parameters for differential waveform for these display can easily be changed for experimenting

• GDEW042T2 would have greyed background without sustain phase

• GDEW042T2 needs multiple full refreshes after extended use of partial updates

  Version 1.1.10

• added support for GDEH0213B73 2.13" b/w, replacement for GDE0213B1, GDEH0213B72

• added support for GDEW026T0 2.6" b/w 152x256

• added support for GDEW0371W7 3.7" b/w 240x416

• added support for GDEW075Z08 7.5" b/w/r 800x480

• GDEW075Z08 does allow (slow) partial update, set usePartialUpdate = false to disable for better image

• changed 4.2" b/w waveform table, for better result with actual panels

  Version 1.1.9

• note for ESP8266 when using SS for CS: (wiring suggestion)

• connect 4.7k pull-down from GPIO15 to GND if your board or shield has level converters

• fixes for large displays (use uint16_t for buffer index)

  Version 1.1.8

• fix for incomplete download in GxEPD2_WiFi_Example

• added missing method displayWindow() to GxEPD2_GFX base class

• fix and clean up of initial refresh for panels with differential update

• initial refresh needs to be full update, not "fast partial update", for these panels,

• as the screen content may differ from the "previous buffer" content.

• add clean of controller buffer(s) on initial write to controller, for partial update.

  Version 1.1.7

• enhanced support for full buffered, non-paged use, for processors with enough RAM

• use void display(bool partial_update_mode = false); corresponds to update() in GxEPD

• use added void displayWindow(uint16_t x, uint16_t y, uint16_t w, uint16_t h);

• use added writeImagePart(...), drawImagePart(...), used by displayWindow()

• added example GxEPD2_NotPagedExample.ino

• several fixes, e.g. parameter range check in setPartialWindow()

  Version 1.1.6

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

• changed SPI speed for IT8951 Driver HAT to 24MHz for write, 10MHz for read

• minor fixes, e.g. centering of text bounding box in GxEPD2_Example

  Version 1.1.5

• added support for 6" ED060SCT on Waveshare e-Paper IT8951 Driver HAT

• uses 3.3V data lines, but 5V supply (~80mA active, ~20mA stand-by, sleep doesn't work)

• note: 5V supply needs to be exact and strong; 5V over diode from USB (e.g. Wemos D1 mini) doesn't work!

• note that the IT8951 Driver HAT is panel specific, with flash parameterized by supplier

• this is an initial version

  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