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105 lines
2.7 KiB
Go
105 lines
2.7 KiB
Go
// Copyright 2018 The Periph Authors. All rights reserved.
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// Use of this source code is governed under the Apache License, Version 2.0
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// that can be found in the LICENSE file.
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package ssd1306_test
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import (
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"flag"
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"fmt"
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"image"
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"image/color"
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"image/draw"
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"log"
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"math"
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"time"
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"periph.io/x/conn/v3/i2c/i2creg"
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"periph.io/x/devices/v3/ssd1306"
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"periph.io/x/devices/v3/ssd1306/image1bit"
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"periph.io/x/host/v3"
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)
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func Example() {
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// Make sure periph is initialized.
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if _, err := host.Init(); err != nil {
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log.Fatal(err)
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}
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var width = flag.Int("width", 128, "Display Width")
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var height = flag.Int("height", 64, "Display Height")
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flag.Parse()
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// Use i2creg I²C bus registry to find the first available I²C bus.
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b, err := i2creg.Open("")
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if err != nil {
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log.Fatal(err)
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}
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defer b.Close()
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opts := ssd1306.DefaultOpts
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opts.W = *width
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opts.H = *height
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if opts.H == 32 {
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opts.Sequential = true
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}
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dev, err := ssd1306.NewI2C(b, &opts)
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if err != nil {
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log.Fatalf("failed to initialize display: %s", err.Error())
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}
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fmt.Printf("device=%s\n", dev.String())
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img := image1bit.NewVerticalLSB(dev.Bounds())
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// Note: this code is commented out so periph does not depend on:
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// "golang.org/x/image/font"
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// "golang.org/x/image/font/basicfont"
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// "golang.org/x/image/math/fixed"
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//
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// Draw on it.
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/*
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f := basicfont.Face7x13
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drawer := font.Drawer{
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Dst: img,
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Src: &image.Uniform{image1bit.On},
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Face: f,
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Dot: fixed.P(0, img.Bounds().Dy()-1-f.Descent),
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}
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drawer.DrawString("Hello from periph!")
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_ = dev.Draw(dev.Bounds(), img, image.Point{})
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time.Sleep(5 * time.Second)
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*/
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white := color.RGBA{255, 255, 255, 255}
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black := color.RGBA{0, 0, 0, 255}
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colors := []color.RGBA{white, black}
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rectNum := 0
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// Draw some nested rectangles
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for w, h := opts.W, opts.H; w > 0 && h > 0; w, h = w-4, h-4 {
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rect := image.Rect(0, 0, w, h)
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draw.Draw(img, rect.Add(image.Point{X: rectNum * 2, Y: rectNum * 2}), &image.Uniform{colors[rectNum%2]}, image.Point{}, draw.Src)
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rectNum += 1
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}
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if err := dev.Draw(dev.Bounds(), img, image.Point{}); err != nil {
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log.Fatal(err)
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}
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time.Sleep(5 * time.Second)
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// Draw a Sine Wave
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_ = dev.Invert(true)
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img = image1bit.NewVerticalLSB(dev.Bounds())
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img.DrawHLine(0, opts.W, opts.H>>1-1, image1bit.On)
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img.DrawVLine(0, opts.H, opts.W>>1-1, image1bit.On)
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angle := float64(0)
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angleStep := float64((4 * math.Pi) / float64(opts.W))
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scale := float64((opts.H >> 1) - 4)
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for step := opts.W - 1; step >= 0; step -= 1 {
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y := int(float64(math.Sin(angle)*scale)) + opts.H>>1
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img.SetBit(step, y, image1bit.On)
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angle += angleStep
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}
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_ = dev.Draw(dev.Bounds(), img, image.Point{})
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time.Sleep(10 * time.Second)
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_ = dev.Halt()
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}
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