evb

README

evb provides EVB-specific functions for the Go ev3dev interface

github.com/ev3go/evb depends on an ev3dev kernel 4.4.9-ti-rt-r25-11-ev3dev-bb.org or better.

Example code

package main

import (
	"image"
	"image/draw"
	"time"

	"github.com/ev3go/ev3dev/fb"
	"github.com/ev3go/evb"
)

func main() {
	evb.LCD.Init(true)
	defer evb.LCD.Close()

	// Render the gopherbrick to the screen.
	draw.Draw(evb.LCD, evb.LCD.Bounds(), gopher, gopher.Bounds().Min, draw.Src)

	time.Sleep(10 * time.Second)
}

var gopher = &fb.RGB565{
	Pix: []uint8{
		<snip image data bytes>
	},
	Stride: 440,
	Rect: image.Rectangle{
		Min: image.Point{
			X: 0,
			Y: 0,
		},
		Max: image.Point{
			X: 220,
			Y: 176,
		},
	},
}

Documentation

Overview

Package evb provides evb-specific and higher level access to the ev3dev control and sensor drivers.

Index

• Constants
• Variables

Constants

const (
	// LCDWidth is the width of the LCD screen in pixels.
	LCDWidth = 220

	// LCDHeight is the height of the LCD screen in pixels.
	LCDHeight = 176

	// LCDStride is the width of the LCD screen memory in bytes.
	LCDStride = 440
)

Variables

var LCD = ev3dev.NewFrameBuffer("/dev/fb0", fb.NewRGB565With, LCDWidth, LCDHeight, LCDStride)

LCD is the draw image used draw directly to the evb LCD screen. Drawing operations are safe for concurrent use. It must be initialized before use.

var Speaker = ev3dev.NewSpeaker("/dev/input/by-path/platform-evb-sound-event")

Speaker is a handle to the evb speaker. It must be initialized before use.