initial support for UC8151 driver, used in Pimoroni's badger2040 e-paper (#416)

examples/uc8151/main.go

@@ -0,0 +1,49 @@
+package main
+
+import (
+	"image/color"
+	"machine"
+
+	"tinygo.org/x/drivers/uc8151"
+)
+
+var display uc8151.Device
+var led machine.Pin
+
+func main() {
+	led = machine.LED
+	led.Configure(machine.PinConfig{Mode: machine.PinOutput})
+	machine.SPI0.Configure(machine.SPIConfig{
+		Frequency: 12000000,
+		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: uc8151.ROTATION_270,
+		Speed:    uc8151.MEDIUM,
+		Blocking: true,
+	})
+	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.Display()
+}
+
+func showRect(x int16, y int16, w int16, h int16, c color.RGBA) {
+	for i := x; i < x+w; i++ {
+		for j := y; j < y+h; j++ {
+			display.SetPixel(i, j, c)
+		}
+	}
+}