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U8g2 on ARM Linux
- Pre-configuration
- How to compile
- How to run
[●] 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
[1] Linux Kernel
Select following options:
--> Device Drivers
--> I2C Support
<*> I2C device interface
I2C Hardware Bus support --->
<*> GPIO-based bitbanging I2C
[2] Modify device tree: (eg: arch/csky/boot/dts/gx6605s.dts)
#include <dt-bindings/gpio/gpio.h>
i2c@0 {
compatible = "i2c-gpio";
sda-gpios = <&gpio0 14 (GPIO_ACTIVE_HIGH|GPIO_OPEN_DRAIN)>;
scl-gpios = <&gpio0 15 (GPIO_ACTIVE_HIGH|GPIO_OPEN_DRAIN)>;
i2c-gpio,delay-us = <2>; /* ~100 kHz */
#address-cells = <1>;
#size-cells = <0>;
};
[3] Make sure i2c devices are available
$ls /dev/i2c-*
[1] Linux Kernel
Select following options:
--> Device Drivers
--> I2C Support
<*> I2C device interface
[2] Modify device tree: (eg: arch/csky/boot/dts/gx6605s.dts)
&i2c0 {
pinctrl-0 = <&i2c0_pins>;
pinctrl-names = "default";
status = "okay";
};
[3] Make sure i2c devices are accessible
$ls /dev/i2c-*
Coming Soon
Coming Soon
First, clone this repo:
$ git clone --recursive https://github.com/wuhanstudio/u8g2-arm-linux.git
$ cd u8g2-arm-linux
Change cross-compiler in according to your board.
# Chosse proper compiler for your PI
# NanoPi: arm-linux-gnueabi-gcc
# Raspberry Pi Zero: arm-none-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 example:
arm-none-linux-gnueabi-gcc for armv6
arm-none-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++
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
Now, execute:
$ sudo ./bin/u8g2_hw_i2c
- Author:Wu Han
- Homepage:http://wuhanstudio.cc
- Email:wuhanstudios@gmail.com