/u8g2-arm-linux

U8g2 for arm linux - a monochrome graphics library

Primary LanguageCOtherNOASSERTION

U8g2 for arm/x86-linux

CircleCI

Quick Start

$ cd u8g2-arm-linux
$ make
$ ls bin/

针对 MZ-1FXS-CBC09-XXX 主板 三种i2c控制方式

  1. userspace软件模拟i2c

    • 确认SCL: 447, SDA: 446, RST: 376 作为普通GPIO配置
    • Userspace 可通过/sys/class/gpio/接口控制
    • $ sudo ./bin/u8g2_sw_i2c

  2. 内核i2c-gpio模拟hw-i2c

    • 修改BIOS配置, 将i2c-2关闭(使得PIN脚被定义为普通GPIO)
    • 取消GPIO应用层导出: echo 446,447 > /sys/class/gpio/unexport
    • 加载i2c-gpio驱动: modprobe i2c-gpio
    • 加载自定义pin脚的i2c-gpio驱动: insmod i2c-gpio-custom.ko bus0=12,446,447,[5/50]
    • $ sudo ./bin/u8g2_hw_i2c

  3. 硬件designware-i2c驱动

    • 修改BIOS的ACPI开启i2c-2位designware硬件i2c
    • ls /dev/i2c* 能看到 /dev/i2c-2
    • ls /sys/class/i2c-adapter/ -l 能看到 i2c_designware.N/i2c-N 的适配器
    • $ sudo ./bin/u8g2_hw_i2c

Check wiki here for set-up

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


Nanopi

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

Nanopi-Neo

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

Raspi-Zero

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

Raspi2-B+

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

orangepi-zero

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

licheepi-nano

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

csky-ck610

How to compile

First, clone this repo:

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

$ cd u8g2-arm-linux

Change cross-compiler in Makefile under each example directory 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:

$ make

How to run

Before running, you can check your I2C graphic 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 0:

$ i2cdetect -y -r 0

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

Contact