epd2in66b: Waveshare 2.66inch E-Paper Display Module (B) for Raspberry Pi Pico (#673)

epd2in66b: add working driver

Co-authored-by: Thomas Richner <thomas.richner@oviva.com>

waveshare-epd/epd2in66b/dev_pico.go

@@ -0,0 +1,34 @@
+//go:build pico
+
+package epd2in66b
+
+import (
+	"machine"
+)
+
+// DefaultConfig contains the default config for the https://www.waveshare.com/wiki/Pico-ePaper-2.66 module
+var DefaultConfig = Config{
+	DataPin:       machine.GP8,
+	ChipSelectPin: machine.GP9,
+	ResetPin:      machine.GP12,
+	BusyPin:       machine.GP13,
+}
+
+// NewPicoModule allocates a new device backed by the https://www.waveshare.com/wiki/Pico-ePaper-2.66 module
+// This will also configure the SPI1 bus and configure the device with the DefaultConfig
+func NewPicoModule() (Device, error) {
+	spi := machine.SPI1
+
+	if err := spi.Configure(machine.SPIConfig{
+		Frequency: Baudrate,
+	}); err != nil {
+		return Device{}, err
+	}
+
+	dev := New(spi)
+	if err := dev.Configure(DefaultConfig); err != nil {
+		return dev, err
+	}
+
+	return dev, nil
+}