[WiP] ST7735 display support

display/display.go

@@ -0,0 +1,119 @@
+package display
+
+import (
+	"image"
+	"image/color"
+	"io"
+	"log"
+	"sync"
+
+	"github.com/asssaf/st7735-go/st7735"
+	"periph.io/x/conn/v3/driver/driverreg"
+	"periph.io/x/conn/v3/gpio/gpioreg"
+	"periph.io/x/conn/v3/spi"
+	"periph.io/x/conn/v3/spi/spireg"
+	"periph.io/x/host/v3"
+)
+
+type Rotation uint8
+
+const (
+	NO_ROTATION  Rotation = 0
+	ROTATION_90  Rotation = 1 // 90 degrees clock-wise rotation
+	ROTATION_180 Rotation = 2
+	ROTATION_270 Rotation = 3
+	WIDTH        int      = 80
+	HEIGHT       int      = 160
+)
+
+var once sync.Once
+var display *Display
+
+type Display struct {
+	p   spi.PortCloser
+	dev *st7735.Dev
+}
+
+func init() {
+	if _, err := host.Init(); err != nil {
+		log.Fatal(err)
+	}
+
+	if _, err := driverreg.Init(); err != nil {
+		log.Fatal(err)
+	}
+}
+
+func Init() (*Display, error) {
+	var err error
+	once.Do(func() {
+		display = &Display{}
+		display.p, err = spireg.Open("SPI0.1")
+		if err != nil {
+			return
+		}
+		display.dev, err = st7735.New(display.p.(spi.Port), gpioreg.ByName("GPIO9"), nil, nil, &st7735.DefaultOpts)
+	})
+
+	return display, err
+}
+
+func (d *Display) Close() {
+}
+
+func (d *Display) DrawImage(reader io.Reader) {
+}
+
+func (d *Display) DrawRAW(img image.Image) {
+}
+
+//func (d *Display) Rotate(rotation Rotation) {
+//	d.dev.SetRotation(st7789.Rotation(rotation))
+//}
+
+func (d *Display) FillScreen(c color.RGBA) error {
+	bounds := image.Rectangle{Min: image.Point{0, 0}, Max: image.Point{int(WIDTH), HEIGHT}}
+	img := image.NewRGBA(bounds)
+	for x := bounds.Min.X; x < bounds.Max.X; x++ {
+		for y := bounds.Min.Y; y < bounds.Max.Y; y++ {
+			img.Set(x, y, c)
+		}
+	}
+	return d.dev.DisplayImage(0, 0, img)
+}
+
+func (d *Display) SetPixel(x int16, y int16, c color.RGBA) {
+}
+
+// PowerOff the display
+func (d *Display) PowerOff() error {
+	dev, err := d.bldev()
+	if err != nil {
+		return err
+	}
+	dev.SetBacklight(false)
+
+	return nil
+}
+
+// PowerOn the display
+func (d *Display) PowerOn() error {
+	dev, err := d.bldev()
+	if err != nil {
+		return err
+	}
+	dev.SetBacklight(true)
+
+	return nil
+}
+
+func (d *Display) bldev() (*st7735.Dev, error) {
+	backlightPin := gpioreg.ByName("GPIO12")
+	p, err := spireg.Open("SPI0.0")
+	if err != nil {
+		return nil, err
+	}
+	defer p.Close()
+
+	return st7735.New(p.(spi.Port), gpioreg.ByName("GPIO9"), nil, backlightPin, &st7735.DefaultOpts)
+}

examples/display.go

@@ -0,0 +1,32 @@
+package main
+
+import (
+	"image/color"
+	"time"
+
+	"github.com/rubiojr/go-enviroplus/display"
+)
+
+func main() {
+	d, err := display.Init()
+	if err != nil {
+		panic(err)
+	}
+
+	err = d.PowerOn()
+	if err != nil {
+		panic(err)
+	}
+
+	err = d.FillScreen(color.RGBA{R: 255, G: 0, B: 0, A: 255})
+	if err != nil {
+		panic(err)
+	}
+
+	time.Sleep(5 * time.Second)
+
+	err = d.PowerOff()
+	if err != nil {
+		panic(err)
+	}
+}

go.mod

@@ -3,10 +3,11 @@ module github.com/rubiojr/go-enviroplus
 go 1.15
 
 require (
+	github.com/asssaf/st7735-go v0.0.2
 	github.com/jacobsa/go-serial v0.0.0-20180131005756-15cf729a72d4
 	github.com/rs/zerolog v1.20.0
-	golang.org/x/sys v0.0.0-20210124154548-22da62e12c0c
-	periph.io/x/conn/v3 v3.6.7
-	periph.io/x/devices/v3 v3.6.7
-	periph.io/x/host/v3 v3.6.7
+	golang.org/x/sys v0.0.0-20211210111614-af8b64212486
+	periph.io/x/conn/v3 v3.6.10
+	periph.io/x/devices/v3 v3.6.13
+	periph.io/x/host/v3 v3.7.2
 )

go.sum

@@ -1,22 +1,47 @@
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 github.com/jacobsa/go-serial v0.0.0-20180131005756-15cf729a72d4/go.mod h1:2RvX5ZjVtsznNZPEt4xwJXNJrM3VTZoQf7V6gk0ysvs=
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