split files

.gitignore

@@ -0,0 +1,130 @@
+### JetBrains template
+# Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm, CLion, Android Studio, WebStorm and Rider
+# Reference: https://intellij-support.jetbrains.com/hc/en-us/articles/206544839
+
+# User-specific stuff
+.idea/**/workspace.xml
+.idea/**/tasks.xml
+.idea/**/usage.statistics.xml
+.idea/**/dictionaries
+.idea/**/shelf
+
+# AWS User-specific
+.idea/**/aws.xml
+
+# Generated files
+.idea/**/contentModel.xml
+
+# Sensitive or high-churn files
+.idea/**/dataSources/
+.idea/**/dataSources.ids
+.idea/**/dataSources.local.xml
+.idea/**/sqlDataSources.xml
+.idea/**/dynamic.xml
+.idea/**/uiDesigner.xml
+.idea/**/dbnavigator.xml
+
+# Gradle
+.idea/**/gradle.xml
+.idea/**/libraries
+
+# Gradle and Maven with auto-import
+# When using Gradle or Maven with auto-import, you should exclude module files,
+# since they will be recreated, and may cause churn.  Uncomment if using
+# auto-import.
+# .idea/artifacts
+# .idea/compiler.xml
+# .idea/jarRepositories.xml
+# .idea/modules.xml
+# .idea/*.iml
+# .idea/modules
+# *.iml
+# *.ipr
+
+# CMake
+cmake-build-*/
+
+# Mongo Explorer plugin
+.idea/**/mongoSettings.xml
+
+# File-based project format
+*.iws
+
+# IntelliJ
+out/
+
+# mpeltonen/sbt-idea plugin
+.idea_modules/
+
+# JIRA plugin
+atlassian-ide-plugin.xml
+
+# Cursive Clojure plugin
+.idea/replstate.xml
+
+# SonarLint plugin
+.idea/sonarlint/
+
+# Crashlytics plugin (for Android Studio and IntelliJ)
+com_crashlytics_export_strings.xml
+crashlytics.properties
+crashlytics-build.properties
+fabric.properties
+
+# Editor-based Rest Client
+.idea/httpRequests
+
+# Android studio 3.1+ serialized cache file
+.idea/caches/build_file_checksums.ser
+
+### Go template
+# If you prefer the allow list template instead of the deny list, see community template:
+# https://github.com/github/gitignore/blob/main/community/Golang/Go.AllowList.gitignore
+#
+# Binaries for programs and plugins
+*.exe
+*.exe~
+*.dll
+*.so
+*.dylib
+
+# Test binary, built with `go test -c`
+*.test
+
+# Output of the go coverage tool, specifically when used with LiteIDE
+*.out
+
+# Dependency directories (remove the comment below to include it)
+# vendor/
+
+# Go workspace file
+go.work
+
+### macOS template
+# General
+.DS_Store
+.AppleDouble
+.LSOverride
+
+# Icon must end with two \r
+Icon
+
+# Thumbnails
+._*
+
+# Files that might appear in the root of a volume
+.DocumentRevisions-V100
+.fseventsd
+.Spotlight-V100
+.TemporaryItems
+.Trashes
+.VolumeIcon.icns
+.com.apple.timemachine.donotpresent
+
+# Directories potentially created on remote AFP share
+.AppleDB
+.AppleDesktop
+Network Trash Folder
+Temporary Items
+.apdisk
+

epd/epd.go

@@ -74,7 +74,7 @@ func New() (*EPD, error) {
 	return epd, nil
 }
 
-func (e *EPD) TurnOff() error {
+func (e *EPD) turnOff() error {
 	log.Println("turning off...")
 	if err := e.spiReg.Close(); err != nil {
 		return fmt.Errorf("closing SPI: %w", err)
@@ -220,26 +220,12 @@ func (e *EPD) InitFast() {
 
 func (e *EPD) Clear() {
 	log.Println("clearing epd")
-	redBuf := make([]byte, Width*Height/8)
+	e.Fill(White)
-	for i := range redBuf {
-		redBuf[i] = 0x00
-	}
 
-	blackBuf := make([]byte, Width*Height/8)
+	//e.Refresh()
-	for i := range blackBuf {
-		blackBuf[i] = 0xff
-	}
-
-	e.sendCommand(0x10)
-	e.sendDataSlice(blackBuf)
-
-	e.sendCommand(0x13)
-	e.sendDataSlice(redBuf)
-
-	//e.refresh()
 }
 
-func (e *EPD) refresh() {
+func (e *EPD) Refresh() {
 	log.Println("refreshing...")
 	e.sendCommand(0x12)
 	time.Sleep(100 * time.Millisecond)
@@ -255,7 +241,7 @@ func (e *EPD) Sleep() error {
 	e.sendData(0xa5)
 
 	time.Sleep(2 * time.Second)
-	if err := e.TurnOff(); err != nil {
+	if err := e.turnOff(); err != nil {
 		return fmt.Errorf("turning off: %w", err)
 	}
 
@@ -271,19 +257,19 @@ const (
 )
 
 func (e *EPD) Fill(c Color) {
-	log.Println("filling... (not doing anything yet)")
+	log.Println("filling...")
 
-	//switch c {
+	switch c {
-	//case White:
+	case White:
-	//	e.Draw(nil, nil)
+		e.Send(image.White, image.Black)
-	//case Black:
+	case Black:
-	//	e.Draw(image.Black, nil)
+		e.Send(image.Black, image.Black)
-	//case Red:
+	case Red:
-	//	e.Draw(nil, image.Black)
+		e.Send(image.White, image.White)
-	//}
+	}
 }
 
-func (e *EPD) Draw(black image.Image, red image.Image) {
+func (e *EPD) Send(black image.Image, red image.Image) {
 	log.Println("drawing...")
 	if black != nil {
 		log.Println("sending black")
@@ -295,9 +281,6 @@ func (e *EPD) Draw(black image.Image, red image.Image) {
 		e.sendCommand(0x13) // write red data
 		e.sendImg(red)
 	}
-	if black != nil || red != nil {
-		e.refresh()
-	}
 }
 
 func (e *EPD) sendImg(img image.Image) {

font.go

@@ -0,0 +1,21 @@
+package main
+
+import (
+	"fmt"
+	"github.com/golang/freetype/truetype"
+	"github.com/llgcode/draw2d"
+)
+
+type MyFontCache map[string]*truetype.Font
+
+func (fc MyFontCache) Store(fd draw2d.FontData, font *truetype.Font) {
+	fc[fd.Name] = font
+}
+
+func (fc MyFontCache) Load(fd draw2d.FontData) (*truetype.Font, error) {
+	font, stored := fc[fd.Name]
+	if !stored {
+		return nil, fmt.Errorf("font %s is not stored in font cache", fd.Name)
+	}
+	return font, nil
+}

img.go

@@ -0,0 +1,72 @@
+package main
+
+import (
+	"github.com/Crocmagnon/display-epaper/epd"
+	"github.com/llgcode/draw2d"
+	"github.com/llgcode/draw2d/draw2dimg"
+	"image"
+	"image/color"
+)
+
+func getBlack() (*image.RGBA, error) {
+	img := newWhite()
+
+	gc := draw2dimg.NewGraphicContext(img)
+
+	gc.SetFillColor(color.RGBA{0, 0, 0, 255})
+	gc.SetStrokeColor(color.RGBA{0, 0, 0, 255})
+	gc.SetLineWidth(2)
+
+	text(gc, "Hello, world", 18, 110, 50)
+
+	return img, nil
+}
+
+func getRed() (*image.RGBA, error) {
+	img := newBlack()
+	gc := draw2dimg.NewGraphicContext(img)
+	gc.SetFillColor(color.RGBA{0, 0, 0, 255})
+	gc.SetStrokeColor(color.RGBA{255, 255, 255, 255})
+	gc.SetLineWidth(2)
+
+	rect(gc, 10, 10, 50, 50)
+	rect(gc, 60, 10, 100, 50)
+
+	return img, nil
+}
+
+func text(gc *draw2dimg.GraphicContext, s string, size, x, y float64) {
+	gc.SetFontData(draw2d.FontData{Name: fontName})
+	gc.SetFontSize(size)
+	gc.StrokeStringAt(s, x, y)
+}
+
+func newWhite() *image.RGBA {
+	img := image.NewRGBA(image.Rect(0, 0, epd.Width, epd.Height))
+	for y := 0; y < epd.Height; y++ {
+		for x := 0; x < epd.Width; x++ {
+			img.Set(x, y, color.White)
+		}
+	}
+	return img
+}
+
+func newBlack() *image.RGBA {
+	img := image.NewRGBA(image.Rect(0, 0, epd.Width, epd.Height))
+	for y := 0; y < epd.Height; y++ {
+		for x := 0; x < epd.Width; x++ {
+			img.Set(x, y, color.Black)
+		}
+	}
+	return img
+}
+
+func rect(gc *draw2dimg.GraphicContext, x1, y1, x2, y2 float64) {
+	gc.BeginPath()
+	gc.MoveTo(x1, y1)
+	gc.LineTo(x2, y1)
+	gc.LineTo(x2, y2)
+	gc.LineTo(x1, y2)
+	gc.Close()
+	gc.FillStroke()
+}

main.go

@@ -1,18 +1,11 @@
 package main
 
 import (
-	"fmt"
-	"github.com/Crocmagnon/display-epaper/epd"
 	"github.com/golang/freetype/truetype"
 	"github.com/llgcode/draw2d"
-	"github.com/llgcode/draw2d/draw2dimg"
 	_ "golang.org/x/image/bmp"
 	"golang.org/x/image/font/gofont/goregular"
-	"image"
-	"image/color"
 	"log"
-	"os"
-	"periph.io/x/host/v3"
 )
 
 const fontName = "default"
@@ -28,139 +21,9 @@ func main() {
 	fontCache.Store(draw2d.FontData{Name: fontName}, font)
 	draw2d.SetFontCache(fontCache)
 
-	if len(os.Args) < 2 {
+	if err := run(); err != nil {
-		if err := run(); err != nil {
+		log.Fatal("error: ", err)
-			log.Fatal("error: ", err)
-		}
-	} else {
-		img, err := getBlack()
-		if err != nil {
-			log.Fatal(err)
-		}
-		draw2dimg.SaveToPngFile("black.png", img)
-
-		img, err = getRed()
-		if err != nil {
-			log.Fatal(err)
-		}
-		draw2dimg.SaveToPngFile("red.png", img)
-
 	}
 
 	log.Println("done")
 }
-
-func run() error {
-	_, err := host.Init()
-	if err != nil {
-		return fmt.Errorf("initializing host: %w", err)
-	}
-
-	display, err := epd.New()
-	if err != nil {
-		return fmt.Errorf("initializing epd: %w", err)
-	}
-
-	//display.Init()
-	display.InitFast()
-	display.Clear()
-
-	black, err := getBlack()
-	if err != nil {
-		return fmt.Errorf("getting black: %w", err)
-	}
-
-	red, err := getRed()
-	if err != nil {
-		return fmt.Errorf("getting red: %w", err)
-	}
-
-	display.Draw(black, red)
-
-	log.Println("sleeping...")
-
-	if err := display.Sleep(); err != nil {
-		return fmt.Errorf("sleeping: %w", err)
-	}
-
-	log.Println("done")
-
-	return nil
-}
-
-func getBlack() (*image.RGBA, error) {
-	img := newWhite()
-
-	gc := draw2dimg.NewGraphicContext(img)
-
-	gc.SetFillColor(color.RGBA{0, 0, 0, 255})
-	gc.SetStrokeColor(color.RGBA{0, 0, 0, 255})
-	gc.SetLineWidth(2)
-
-	text(gc, "Hello, world", 18, 110, 50)
-
-	return img, nil
-}
-
-func getRed() (*image.RGBA, error) {
-	img := newBlack()
-	gc := draw2dimg.NewGraphicContext(img)
-	gc.SetFillColor(color.RGBA{0, 0, 0, 255})
-	gc.SetStrokeColor(color.RGBA{255, 255, 255, 255})
-	gc.SetLineWidth(2)
-
-	rect(gc, 10, 10, 50, 50)
-	rect(gc, 60, 10, 100, 50)
-
-	return img, nil
-}
-
-func text(gc *draw2dimg.GraphicContext, s string, size, x, y float64) {
-	gc.SetFontData(draw2d.FontData{Name: fontName})
-	gc.SetFontSize(size)
-	gc.StrokeStringAt(s, x, y)
-}
-
-func newWhite() *image.RGBA {
-	img := image.NewRGBA(image.Rect(0, 0, epd.Width, epd.Height))
-	for y := 0; y < epd.Height; y++ {
-		for x := 0; x < epd.Width; x++ {
-			img.Set(x, y, color.White)
-		}
-	}
-	return img
-}
-
-func newBlack() *image.RGBA {
-	img := image.NewRGBA(image.Rect(0, 0, epd.Width, epd.Height))
-	for y := 0; y < epd.Height; y++ {
-		for x := 0; x < epd.Width; x++ {
-			img.Set(x, y, color.Black)
-		}
-	}
-	return img
-}
-
-func rect(gc *draw2dimg.GraphicContext, x1, y1, x2, y2 float64) {
-	gc.BeginPath()
-	gc.MoveTo(x1, y1)
-	gc.LineTo(x2, y1)
-	gc.LineTo(x2, y2)
-	gc.LineTo(x1, y2)
-	gc.Close()
-	gc.FillStroke()
-}
-
-type MyFontCache map[string]*truetype.Font
-
-func (fc MyFontCache) Store(fd draw2d.FontData, font *truetype.Font) {
-	fc[fd.Name] = font
-}
-
-func (fc MyFontCache) Load(fd draw2d.FontData) (*truetype.Font, error) {
-	font, stored := fc[fd.Name]
-	if !stored {
-		return nil, fmt.Errorf("font %s is not stored in font cache", fd.Name)
-	}
-	return font, nil
-}

run_darwin_arm64.go

@@ -0,0 +1,24 @@
+package main
+
+import (
+	"github.com/llgcode/draw2d/draw2dimg"
+	"log"
+)
+
+func run() error {
+	img, err := getBlack()
+	if err != nil {
+		log.Fatal(err)
+	}
+	draw2dimg.SaveToPngFile("out/black.png", img)
+
+	img, err = getRed()
+	if err != nil {
+		log.Fatal(err)
+	}
+	draw2dimg.SaveToPngFile("out/red.png", img)
+
+	log.Println("done")
+
+	return nil
+}

run_linux_arm64.go

@@ -0,0 +1,47 @@
+package main
+
+import (
+	"fmt"
+	"github.com/Crocmagnon/display-epaper/epd"
+	"log"
+	"periph.io/x/host/v3"
+)
+
+func run() error {
+	_, err := host.Init()
+	if err != nil {
+		return fmt.Errorf("initializing host: %w", err)
+	}
+
+	display, err := epd.New()
+	if err != nil {
+		return fmt.Errorf("initializing epd: %w", err)
+	}
+
+	display.Init()
+	//display.InitFast()
+	display.Clear()
+	display.Refresh()
+
+	black, err := getBlack()
+	if err != nil {
+		return fmt.Errorf("getting black: %w", err)
+	}
+
+	red, err := getRed()
+	if err != nil {
+		return fmt.Errorf("getting red: %w", err)
+	}
+
+	display.Send(black, red)
+
+	log.Println("sleeping...")
+
+	if err := display.Sleep(); err != nil {
+		return fmt.Errorf("sleeping: %w", err)
+	}
+
+	log.Println("done")
+
+	return nil
+}