epaper

Driver of Waveshare Electronics e-paper display for Raspberry Pi - in Go lang

Work in progress - Only 2.9" Waveshare Electronics BW display supported for now.

What it can do (so far)

package epaper (comunicates with display over SPI):

• Initialize e-paper display to use either full or partial update
• Swap frame buffer of e-paper display
• Clear frame buffer using black / or white color
• Display arbitraty monochromatic bitmap image
• Put display to Sleep

package epaper/image (creates in-memmory monochromatic bitmap image.Mono):

• Clear whole image to black or white color
• Draw black or white horizontal / vertical lines
• Draw black or white stroked / filled rectangle
• Draw black or white stroked / filled circle
• Write black or white text using Go font (chars from WGL4 charset)
• Paste another image (while converting it to monochromatic color mode) using go's image.Image interface.
• Rotate bitmap 90° in each direction
• Flip (mirror) bitmap vertically or horizontally
• Invert colors

Wiring

e-paper	Raspberry Pi
3.3V	3v3
GND	Ground
DIN	MOSI (BCM 10)
CLK	SCLK (BCM 11)
CS	CE0 (BCM 8)
CD	BCM 25
RST	BCM 22
BUSY	BCM 24

Note that RST is on BCM 22 instead of BCM 17 as in https://pinout.xyz/pinout/213_inch_e_paper_phat - the rest is the same.