Automatic pin mode handling for dht driver example

Author: ysoldak

examples/dht/main.go

@@ -4,11 +4,12 @@ import (
 	"fmt"
 	"machine"
 	"time"
+
 	"tinygo.org/x/drivers/dht"
 )
 
 func main() {
-	pin := machine.D6
+	pin := &machinePin{pin: machine.D6}
 	dhtSensor := dht.New(pin, dht.DHT11)
 	for {
 		temp, hum, err := dhtSensor.Measurements()

examples/dht/pin.go

@@ -0,0 +1,31 @@
+//go:build baremetal && tinygo
+
+package main
+
+import (
+	"machine"
+)
+
+// machinePin wraps machine.Pin to ensure correct pin mode is set when Get or Set methods are called.
+
+type machinePin struct {
+	pin     machine.Pin
+	mode    machine.PinMode
+	modeSet bool
+}
+
+func (p *machinePin) Get() bool {
+	if !p.modeSet || p.mode != machine.PinInput {
+		p.pin.Configure(machine.PinConfig{Mode: machine.PinInput})
+		p.mode = machine.PinInput
+	}
+	return p.pin.Get()
+}
+
+func (p *machinePin) Set(high bool) {
+	if !p.modeSet || p.mode != machine.PinOutput {
+		p.pin.Configure(machine.PinConfig{Mode: machine.PinOutput})
+		p.mode = machine.PinOutput
+	}
+	p.pin.Set(high)
+}