samd21,samd51,nrf52840: add support for USBHID (keyboard / mouse)

src/examples/hid-keyboard/main.go

@@ -0,0 +1,21 @@
+package main
+
+import (
+	"machine"
+	"machine/usb/hid/keyboard"
+	"time"
+)
+
+func main() {
+	button := machine.BUTTON
+	button.Configure(machine.PinConfig{Mode: machine.PinInputPullup})
+
+	kb := keyboard.New()
+
+	for {
+		if !button.Get() {
+			kb.Write([]byte("tinygo"))
+			time.Sleep(200 * time.Millisecond)
+		}
+	}
+}

src/examples/hid-mouse/main.go

@@ -0,0 +1,37 @@
+package main
+
+import (
+	"machine"
+	"machine/usb/hid/mouse"
+	"time"
+)
+
+func main() {
+	button := machine.BUTTON
+	button.Configure(machine.PinConfig{Mode: machine.PinInputPullup})
+
+	mouse := mouse.New()
+
+	for {
+		if !button.Get() {
+			for j := 0; j < 5; j++ {
+				for i := 0; i < 100; i++ {
+					mouse.Move(1, 0)
+					time.Sleep(1 * time.Millisecond)
+				}
+
+				for i := 0; i < 100; i++ {
+					mouse.Move(0, 1)
+					time.Sleep(1 * time.Millisecond)
+				}
+
+				for i := 0; i < 100; i++ {
+					mouse.Move(-1, -1)
+					time.Sleep(1 * time.Millisecond)
+				}
+			}
+
+			time.Sleep(100 * time.Millisecond)
+		}
+	}
+}