# 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 1.0.0
- preliminary version, under construction