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

src/machine/usb/hid/mouse/mouse.go

@@ -0,0 +1,90 @@
+package mouse
+
+import (
+	"machine/usb/hid"
+)
+
+var Mouse *mouse
+
+type mouse struct {
+	buf *hid.RingBuffer
+}
+
+func init() {
+	if Mouse == nil {
+		Mouse = newMouse()
+		hid.SetCallbackHandler(Mouse)
+	}
+}
+
+// New returns hid-mouse.
+func New() *mouse {
+	return Mouse
+}
+
+func newMouse() *mouse {
+	return &mouse{
+		buf: hid.NewRingBuffer(),
+	}
+}
+
+func (m *mouse) Callback() bool {
+	if b, ok := m.buf.Get(); ok {
+		hid.SendUSBPacket(b[:5])
+		return true
+	}
+	return false
+}
+
+// Move is a function that moves the mouse cursor.
+func (m *mouse) Move(vx, vy int) {
+	if vx == 0 && vy == 0 {
+		return
+	}
+
+	if vx < -128 {
+		vx = -128
+	}
+	if vx > 127 {
+		vx = 127
+	}
+
+	if vy < -128 {
+		vy = -128
+	}
+	if vy > 127 {
+		vy = 127
+	}
+
+	m.buf.Put([]byte{
+		0x01, 0x00, byte(vx), byte(vy), 0x00,
+	})
+}
+
+// WHEEL controls the mouse wheel.
+func (m *mouse) Wheel(v int) {
+	if v == 0 {
+		return
+	}
+
+	if v < -128 {
+		v = -128
+	}
+	if v > 127 {
+		v = 127
+	}
+
+	m.buf.Put([]byte{
+		0x01, 0x00, 0x00, 0x00, byte(v),
+	})
+}
+
+// WheelDown turns the mouse wheel down.
+func (m *mouse) WheelDown() {
+	m.Wheel(-1)
+}
+
+// WheelUp turns the mouse wheel up.
+func (m *mouse) WheelUp() {
+	m.Wheel(1)
+}