U8g2 for arm-linux

Quick Start

$ git clone --recursive https://github.com/wuhanstudio/u8g2-arm-linux.git
$ cd u8g2-arm-linux

# Build source with GPIO character device
$ make CPPFLAGS=-DPERIPHERY_GPIO_CDEV_SUPPORT=1 CC=gcc CXX=g++

# Build source with GPIO sysfs (legacy)
$ make CC=gcc CXX=g++

$ ls bin/

Check wiki here for the kernel set up.

• U8g2 for arm-linux
  • Introduction
  • Todo list
  • Gallery
  • How to compile
  • Run Examples

Introduction

U8g2 is a monochrome graphics library for embedded devices, and I ported it onto arm linux.

It should work fine on virtually all devices running linux with i2c, spi support, since no libraries pertaining to specific platforms has been used, yet you need to choose right compilers for your devices.

Todo list

[●] Hardware I2C
[●] Hardware SPI
[●] Software I2C
[●] Software SPI
[●] 8080 mode
[●] Add C++ wrapper
[●] Faster GPIO by tracking fd
[●] Better build system
[●] Upstream the port
[●] Replace sysfs with gpiod
[  ] Benchmark

Gallery

Nanopi
http://wiki.friendlyarm.com/wiki/index.php/NanoPi

Nanopi NEO
http://wiki.friendlyarm.com/wiki/index.php/NanoPi_NEO

Raspberry Pi ZERO
https://www.raspberrypi.org/products/raspberry-pi-zero/

Raspberry Pi 2 B+
https://www.raspberrypi.org/products/raspberry-pi-2-model-b/

Orange Pi ZERO
http://www.orangepi.org/orangepizero/

Lichee Pi NANO
http://nano.lichee.pro/

C-SKY
https://c-sky.github.io/docs/gx6605s.html

How to compile

First, clone this repo:

$ git clone --recursive https://github.com/wuhanstudio/u8g2-arm-linux.git
$ cd u8g2-arm-linux

Change the cross-compiler according to your board.

# Chosse proper compiler for your PI
# NanoPi:             arm-linux-gnueabi-gcc
# Raspberry Pi Zero:  arm-linux-gnueabi-gcc

# Raspberry Pi 2:     arm-linux-gnueabihf-gcc
# OrangePi Zero:      arm-linux-gnueabihf-gcc
# NanoPi NEO:         arm-linux-gnueabihf-gcc
# NanoPi NEO Plus 2:  arm-linux-gnueabihf-gcc
# C-SKY:              csky-linux-gcc	
CC = arm-linux-gnueabihf-gcc

For cross-compile:

arm-linux-gnueabi-gcc   for armv6  
arm-linux-gnueabihf-gcc for armv7

For native-compile (compile on your board), simply use:

CC = gcc

Finally, time to compile:

# Build source with GPIO character device
$ make CPPFLAGS=-DPERIPHERY_GPIO_CDEV_SUPPORT=1 CC=gcc CXX=g++

# Build source with GPIO sysfs (legacy)
$ make CC=gcc CXX=g++

Run Examples

Before running, you can check your I2C devices using i2c-tools:

$ sudo apt-get install i2c-tools

List your devices:

$ ls /dev/i2c*
/dev/i2c-0  /dev/i2c-1

Probe your devices on bus 1:

$ i2cdetect -y -r 1

For cross-compile, you can change ip address in Makefile:

# IP Address of your PI	
PI=pi@10.1.1.232

Then upload generated binary file onto your board:

$ make upload

Related Projects

• U8g2: https://github.com/olikraus/u8g2
• U8glib: https://github.com/olikraus/u8glib

Contact

• Author：Han Wu
• Homepage：http://wuhanstudio.cc
• Contact：https://github.com/wuhanstudio/u8g2-arm-linux/issues