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
fullorpartialupdate - 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.Imageinterface. - 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.