aleross97 / epaper

Project for displaying stories on the GFX HAT for Raspberry Pi Zero W

epaper

Project for displaying stories with Pimoroni GFX HAT and Raspberry Pi Zero

These repository contains

• Three cpp classes:

  • spi_device: uses /dev/spi*.* to comunicate with the display (so the SPI driver must be enabled - see config.txt on raspberry pi)

  • gpio_device: direct access to memory to handle the GPIO pins

  • graphic_device: class to handle the GFX HAT display, requires spi_device and gpio_device

  • epaper: Old class to handle InkyPhat epaper display, not used anymore

• Two files from another repository (https://github.com/mattflow/cbmp):

  • cbmp.c: i did not write this.

  • cbmp.h: i did not write this.

How to build

Clone the repository and run the build.sh by issuing:

bash build.sh

This will generate:

• app_DisplayGrid.o: displays a set of axys on the display to check alignment. Does not require any dependencies.

• app_DisplayImage.o: displays the image "prova.bmp" to the display. Must be of the right size, if not an error is generated.

• app_GraphicTest.o: displays a moving square on the display

• app_TestButtonsLeds.o: uses directly i2c to test buttons and leds

Issues

Opened issues:

• SPI might always read 0

Unsupported

• Fast update on the inky phat display

Work in progress

This i'm working on and eventually do and update:

• Niente

Useful links

Resource i find useful to build this:

Display controller datasheet

Raspberry PI Zero W datasheet

Ben Krasnow fast update implementation for epaper

InkyPhat/InkyWhat python library github repository

Success thread oni fast updating for SSD1675A controllers