GoでI2C制御のAQM0802液晶を使う ref: http://qiita.com/kmtr/items/6f61d2e1609ae83ce5c4

file0.txt

$ env GOOS=linux GOARCH=arm GOARM=7 go build

file1.txt

$ sudo raspi-config

file2.txt

1 Advanced Options

A7 I2C

Yes

Finish

file3.txt

$ sudo rmmod i2c-dev i2c-bcm2708
$ sudo modprobe i2c-bcm2708 baudrate=50000
$ sudo modprobe i2c-dev

file4.go

dev := i2c.New(0x3e, 1)

file5.txt

dev := i2c.New(0x3e, 1)
dev.Write([]byte{0x0, 0x38})

file6.txt

const (
    wait = 26300 * time.Nanosecond
)

func cmd(dev *i2c.I2C, b byte) {
    dev.Write([]byte{0x0, b})
    time.Sleep(wait)
}

file7.txt

func write(dev *i2c.I2C, s string) {
    chars := []byte(s)
    dev.Write(append([]byte{0x40}, chars...))
    time.Sleep(wait)
}

file8.go

package main

import (
    "time"

    "github.com/davecheney/i2c"
)

const (
    wait = 26300 * time.Nanosecond
)

func cmd(dev *i2c.I2C, b byte) {
    dev.Write([]byte{0x0, b})
    time.Sleep(wait)
}

func write(dev *i2c.I2C, s string) {
    chars := []byte(s)
    dev.Write(append([]byte{0x40}, chars...))
    time.Sleep(wait)
}

func main() {
    dev, _ := i2c.New(0x3e, 1)

    cmd(dev, 0x38)
    cmd(dev, 0x39)
    cmd(dev, 0x14)
    cmd(dev, 0x70)
    cmd(dev, 0x56)
    cmd(dev, 0x6c)
    time.Sleep(200 * time.Millisecond)
    cmd(dev, 0x38)
    cmd(dev, 0x0c)
    cmd(dev, 0x01)
    time.Sleep(1080 * time.Microsecond)

    write(dev, "Origami")
}