refactor: add display.Pin interface and use it everywhere that is easy to do so

Signed-off-by: deadprogram <ron@hybridgroup.com>

waveshare-epd/epd2in66b/dev.go

@@ -5,7 +5,6 @@ package epd2in66b
 
 import (
 	"image/color"
-	"machine"
 	"time"
 
 	"tinygo.org/x/drivers"
@@ -19,18 +18,18 @@ const (
 const Baudrate = 4_000_000 // 4 MHz
 
 type Config struct {
-	ResetPin      machine.Pin
-	DataPin       machine.Pin
-	ChipSelectPin machine.Pin
-	BusyPin       machine.Pin
+	ResetPin      drivers.Pin
+	DataPin       drivers.Pin
+	ChipSelectPin drivers.Pin
+	BusyPin       drivers.Pin
 }
 
 type Device struct {
 	bus  drivers.SPI
-	cs   machine.Pin
-	dc   machine.Pin
-	rst  machine.Pin
-	busy machine.Pin
+	cs   drivers.Pin
+	dc   drivers.Pin
+	rst  drivers.Pin
+	busy drivers.Pin
 
 	blackBuffer []byte
 	redBuffer   []byte
@@ -50,18 +49,14 @@ func New(bus drivers.SPI) Device {
 	}
 }
 
-// Configure configures the device and its pins.
+// Configure configures the device. Note that pins should already
+// be configured. Busy pin should be input, the rest should be output.
 func (d *Device) Configure(c Config) error {
 	d.cs = c.ChipSelectPin
 	d.dc = c.DataPin
 	d.rst = c.ResetPin
 	d.busy = c.BusyPin
 
-	d.cs.Configure(machine.PinConfig{Mode: machine.PinOutput})
-	d.dc.Configure(machine.PinConfig{Mode: machine.PinOutput})
-	d.rst.Configure(machine.PinConfig{Mode: machine.PinOutput})
-	d.busy.Configure(machine.PinConfig{Mode: machine.PinInput})
-
 	return nil
 }