uc8151: improvements to speed and also add flicker-free mode based on @…

…antirez code example

Signed-off-by: deadprogram <[email protected]>

examples/uc8151/main.go

@@ -3,6 +3,7 @@ package main
 import (
 	"image/color"
 	"machine"
+	"time"
 
 	"tinygo.org/x/drivers"
 	"tinygo.org/x/drivers/uc8151"
@@ -15,30 +16,56 @@ func main() {
 	led = machine.LED
 	led.Configure(machine.PinConfig{Mode: machine.PinOutput})
 	machine.SPI0.Configure(machine.SPIConfig{
-		Frequency: 12000000,
+		Frequency: 12 * machine.MHz,
 		SCK:       machine.EPD_SCK_PIN,
 		SDO:       machine.EPD_SDO_PIN,
 	})
 
 	display = uc8151.New(machine.SPI0, machine.EPD_CS_PIN, machine.EPD_DC_PIN, machine.EPD_RESET_PIN, machine.EPD_BUSY_PIN)
 	display.Configure(uc8151.Config{
-		Rotation: drivers.Rotation270,
-		Speed:    uc8151.MEDIUM,
-		Blocking: true,
+		Rotation:    drivers.Rotation270,
+		Speed:       uc8151.TURBO,
+		FlickerFree: true,
+		Blocking:    false,
 	})
 	black := color.RGBA{1, 1, 1, 255}
 
-	display.ClearBuffer()
-	display.Display()
-	for i := int16(0); i < 37; i++ {
-		for j := int16(0); j < 16; j++ {
-			if (i+j)%2 == 0 {
-				showRect(i*8, j*8, 8, 8, black)
+	display.ClearDisplay()
+
+	mod := int16(1)
+	for {
+		// checkerboard
+		for i := int16(0); i < 11; i++ {
+			if mod == 1 {
+				mod = 0
+			} else {
+				mod = 1
+			}
+
+			display.ClearBuffer()
+			for i := int16(0); i < 37; i++ {
+				for j := int16(0); j < 16; j++ {
+					if (i+j)%2 == mod {
+						showRect(i*8, j*8, 8, 8, black)
+					}
+				}
 			}
+			display.Display()
+			time.Sleep(500 * time.Millisecond)
 		}
-	}
 
-	display.Display()
+		// moving line
+		for i := int16(16); i < 21; i++ {
+			display.ClearBuffer()
+			for j := int16(0); j < 16; j++ {
+				if (i+j)%2 == 0 {
+					showRect(i*8, j*8, 8, 8, black)
+				}
+				display.Display()
+				time.Sleep(250 * time.Millisecond)
+			}
+		}
+	}
 }
 
 func showRect(x int16, y int16, w int16, h int16, c color.RGBA) {

uc8151/lut.go

@@ -0,0 +1,30 @@
+package uc8151
+
+// LUTType is the look-up table for the display
+type LUTType [42]uint8
+
+type LUTSet struct {
+	VCOM LUTType
+	WW   LUTType
+	BW   LUTType
+	WB   LUTType
+	BB   LUTType
+}
+
+func (lut *LUTType) Clear() {
+	for i := range lut {
+		lut[i] = 0
+	}
+}
+
+func (lut *LUTType) SetRow(row int, pat uint8, dur [4]uint8, rep uint8) error {
+	index := row * 6
+	lut[index] = pat
+	lut[index+1] = dur[0]
+	lut[index+2] = dur[1]
+	lut[index+3] = dur[2]
+	lut[index+4] = dur[3]
+	lut[index+5] = rep
+
+	return nil
+}

uc8151/registers.go

@@ -150,7 +150,9 @@ const (
 	ROTATION_270 = drivers.Rotation270
 
 	DEFAULT Speed = 0
-	MEDIUM  Speed = 1
-	FAST    Speed = 2
-	TURBO   Speed = 3
+	SLOW    Speed = 1
+	MEDIUM  Speed = 2
+	FAST    Speed = 3
+	FASTER  Speed = 4
+	TURBO   Speed = 5
 )