GxEPD2 forked from https://github.com/ZinggJM/GxEPD2
- See https://github.com/ZinggJM/GxEPD2 for documentation on supported e-paper devices
- This fork extends GxEPD2 to work on a Raspberry Pi
- Uses the wiringPi library for access to pins
- SPI interface to the e-paper device
- Includes a simple version of the AdaFruit GFX library
- This fork is of v1.3.7
- 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 bords 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 bords with "clever" reset circuit need 1k pull-up on RST on ESP8266, or different pin
- 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 neededvoid drawPaged(void (*drawCallback)(const void*), const void* pv)- paged drawing is done using Adafruit_GFX methods inside picture loop or drawCallback
- 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()
- 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
- Waveshare e-paper displays with SPI: http:https://forum.arduino.cc/index.php?topic=487007.0
- Good Display ePaper for Arduino : https://forum.arduino.cc/index.php?topic=436411.0
- 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
- GDEW0102T4 1.02" b/w
- GDEP015OC1 1.54" b/w
- GDEH0154D67 1.54" b/w, replacement for GDEP015OC1
- GDEW0154T8 1.54" b/w 152x152
- GDEW0154M09 1.54" b/w 200x200
- GDEW0154M10 1.54" b/w 152x152 DES
- GDEW0154Z04 1.54" b/w/r 200x200
- GDEH0154Z90 1.54" b/w/r, replacement for GDEW0154Z04
- GDE0213B1 2.13" b/w
- GDEH0213B72 2.13" b/w, replacement for GDE0213B1
- GDEH0213B73 2.13" b/w, new replacement for GDE0213B1, GDEH0213B72
- GDEM0213B74 2.13" b/w
- GDEW0213I5F 2.13" b/w flexible
- GDEW0213T5D 2.13" b/w
- GDEW0213M21 2.13" b/w DES
- GDEW0213Z16 2.13" b/w/r
- GDEW0213Z19 2.13" b/w/r
- GDEH029A1 2.9" b/w
- GDEW029T5 2.9" b/w
- GDEW029T5D 2.9" b/w
- GDEM029T94 2.9" b/w
- GDEW029M06 2.9" b/w DES
- GDEW029Z10 2.9" b/w/r
- GDEW029Z13 2.9" b/w/r
- GDEM029C90 2.9" b/w/y
- GDEW026T0 2.6" b/w
- GDEW026M01 2.6" b/w DES
- GDEW027C44 2.7" b/w/r
- GDEW027W3 2.7" b/w
- GDEW0371W7 3.7" b/w
- GDEW042T2 4.2" b/w
- GDEW042M01 4.2" b/w DES
- GDEW042Z15 4.2" b/w/r
- ACeP565 5.65" Waveshare 5.65" 7-color e-paper display 600x448
- GDEW0583T7 5.83" b/w
- GDEW0583T8 5.83" b/w 648x460
- GDEW075T8 7.5" b/w
- GDEW075T7 7.5" b/w 800x480
- GDEW075Z09 7.5" b/w/r
- GDEW075Z08 7.5" b/w/r 800x480
- GDEH075Z90 7.5" b/w/r 880x528
- GDEH116T91 11.6" b/w 960x640
- GDEW1248T3 12.48 b/w 1304x984
- 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
- promotion panels from suppliers are welcome, to add support to GxEPD2
- donation panels from users are welcome, to add support to GxEPD2
- 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
- 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
- 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
- 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
- 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