Example: e-paper dispalys

This test code shows how to use ESP32 driver e-Paper displays

• Support for Waveshare 2.7inch e-Paper HAT based ePaper modules in 4-wire SPI mode

e-paper functions:

• Graphics drawing functions:

• Paint_Clear Clear all screen memery

• Paint_DrawAbsolutePixel This draws a pixel by absolute coordinates

• Paint_GetImage Getters and Setters

• Paint_SetRotate Setup displays rotate

• Paint_DrawPixel Draws a pixel by the coordinates

• Paint_DrawCharAt Draw a charactor on the frame buffer but not refresh

• Paint_DrawStringAt Displays a string on the frame buffer but not refresh

• Paint_DrawLine Draws a line on the frame buffer

• Paint_DrawHorizontalLine Draw a horizontal line on the frame buffer

• Paint_DrawVerticalLine Draw a vertical line on the frame buffer

• Paint_DrawRectangle Draws a rectangle

• Paint_DrawFilledRectangle Draws a filled rectangle

• Paint_DrawCircle Draws a circle

• Paint_DrawFilledCircle Draws a filled circle

• Fonts:

  • Support for font8,font12,font16,font20,font24, fonts embeded

• String write function:

  • EPD_print Write text to display.

• Images:

  • Can display the image form C array

Connecting the display

• mosi: 23 (display DIN)
• sck: 18
• CS: 5 (display CS)
• DC: 26 (display DC)
• RST: 27 (display RESET)
• BUSY: 32 (display BUSY output)

How to build

make menuconfig

Make and flash the example.

make all && make flash

Test:

• Dispaly espressif logo for 2s
• display the random value on e-paper, refresh 5s