gdew0154m09: add e-paper display driver

examples/gdew0154m09/main.go

@@ -0,0 +1,69 @@
+package main
+
+import (
+	"device/esp"
+	"image/color"
+	"machine"
+	"time"
+
+	"tinygo.org/x/drivers/gdew0154m09"
+	"tinygo.org/x/tinyfont"
+	"tinygo.org/x/tinyfont/freemono"
+)
+
+func main() {
+	// Hold the M5Stack CoreInk power rail on.
+	machine.GPIO12.Configure(machine.PinConfig{Mode: machine.PinOutput})
+	machine.GPIO12.High()
+
+	cs := machine.IO9
+	dc := machine.GPIO15
+	rst := machine.IO0
+	busy := machine.IO4
+	cs.Configure(machine.PinConfig{Mode: machine.PinOutput})
+	dc.Configure(machine.PinConfig{Mode: machine.PinOutput})
+	rst.Configure(machine.PinConfig{Mode: machine.PinOutput})
+	busy.Configure(machine.PinConfig{Mode: machine.PinInput})
+	cs.High()
+	dc.High()
+	rst.High()
+
+	// Enable and reset the ESP32 VSPI peripheral before configuring SPI3.
+	esp.DPORT.SetPERIP_RST_EN_SPI3_RST(1)
+	esp.DPORT.SetPERIP_CLK_EN_SPI3_CLK_EN(1)
+	esp.DPORT.SetPERIP_RST_EN_SPI3_RST(0)
+	if err := machine.SPI3.Configure(machine.SPIConfig{
+		Frequency: gdew0154m09.Baudrate,
+		SCK:       machine.IO18,
+		SDO:       machine.IO23,
+		SDI:       machine.NoPin,
+		Mode:      gdew0154m09.SPIMode,
+	}); err != nil {
+		println("could not configure SPI:", err.Error())
+		return
+	}
+
+	display := gdew0154m09.New(machine.SPI3, cs, dc, rst, busy)
+	if err := display.Configure(gdew0154m09.DefaultConfig); err != nil {
+		println("could not configure display:", err.Error())
+		return
+	}
+
+	black := color.RGBA{A: 0xff}
+	tinyfont.WriteLine(display, &freemono.Bold18pt7b, 15, 90, "TinyGo", black)
+	for x := int16(0); x < gdew0154m09.Width; x++ {
+		display.SetPixel(x, 0, black)
+		display.SetPixel(x, gdew0154m09.Height-1, black)
+	}
+	for y := int16(0); y < gdew0154m09.Height; y++ {
+		display.SetPixel(0, y, black)
+		display.SetPixel(gdew0154m09.Width-1, y, black)
+	}
+
+	if err := display.Display(); err != nil {
+		println("could not refresh display:", err.Error())
+	}
+	for {
+		time.Sleep(time.Hour)
+	}
+}