Review changes

aip31068/dev.go

@@ -53,7 +53,8 @@ type Dev struct {
 	blink  bool
 	on     bool
 	cursor bool
-	backlight interface{}
+	blMono display.DisplayBacklight
+	blRGB  display.DisplayRGBBacklight
 }
 
 func wrap(err error) error {
@@ -71,16 +72,22 @@ func wrap(err error) error {
 // display.DisplayRGBBacklight.
 func New(bus i2c.Bus,
 	address uint16,
-	backlight interface{},
+	backlight any,
 	rows,
 	cols int) (*Dev, error) {
 
 	dev := &Dev{
 		d:    &i2c.Dev{Bus: bus, Addr: address},
-		backlight: backlight,
 		rows: rows,
 		cols: cols,
 	}
+	switch bl := backlight.(type) {
+	case display.DisplayBacklight:
+		dev.blMono = bl
+	case display.DisplayRGBBacklight:
+		dev.blRGB = bl
+	}
+
 	err := dev.init()
 	if err != nil {
 		dev = nil
@@ -118,7 +125,6 @@ func (dev *Dev) init() error {
 		_ = dev.Backlight(0xff)
 	}
 	if err != nil {
-		fmt.Println("dev.init() returns", err)
 		err = wrap(err)
 	}
 	return err
@@ -343,27 +349,23 @@ func (dev *Dev) WriteString(text string) (n int, err error) {
 
 // Set the backlight intensity.
 func (dev *Dev) Backlight(intensity display.Intensity) error {
-	switch bl := dev.backlight.(type) {
+	if dev.blMono != nil {
-	case display.DisplayBacklight:
+		return dev.blMono.Backlight(intensity)
-		return bl.Backlight(intensity)
+	} else if dev.blRGB != nil {
-	case display.DisplayRGBBacklight:
+		return dev.blRGB.RGBBacklight(intensity, intensity, intensity)
-		return bl.RGBBacklight(intensity, intensity, intensity)
-	default:
-		return ErrNotImplemented
 	}
+	return ErrNotImplemented
 }
 
 // For units that have an RGB Backlight, set the backlight color/intensity.
 // The range of the values is 0-255.
 func (dev *Dev) RGBBacklight(red, green, blue display.Intensity) error {
-	switch bl := dev.backlight.(type) {
+	if dev.blRGB != nil {
-	case display.DisplayRGBBacklight:
+		return dev.blRGB.RGBBacklight(red, green, blue)
-		return bl.RGBBacklight(red, green, blue)
+	} else if dev.blMono != nil {
-	case display.DisplayBacklight:
+		return dev.blMono.Backlight(red | green | blue)
-		return bl.Backlight(red | green | blue)
-	default:
-		return ErrNotImplemented
 	}
+	return ErrNotImplemented
 }
 
 var _ conn.Resource = &Dev{}

waveshare1602/example_test.go

@@ -5,7 +5,6 @@
 package waveshare1602_test
 
 import (
-	"fmt"
 	"log"
 	"time"
 
@@ -17,7 +16,6 @@ import (
 )
 
 func Example() {
-	fmt.Println("Starting")
 	// Make sure periph is initialized.
 	if _, err := host.Init(); err != nil {
 		log.Fatal(err)