First cut

usb/misc.go

@@ -0,0 +1,33 @@
+package usb
+
+import (
+	"fmt"
+)
+
+type BCD uint16
+
+const (
+	USB_2_0 BCD = 0x0200
+	USB_1_1 BCD = 0x0110
+	USB_1_0 BCD = 0x0100
+)
+
+func (d BCD) Int() (i int) {
+	ten := 1
+	for o := uint(0); o < 4; o++ {
+		n := ((0xF << (o*4)) & d) >> (o*4)
+		i += int(n) * ten
+		ten *= 10
+	}
+	return
+}
+
+func (d BCD) String() string {
+	return fmt.Sprintf("%02x.%02x", int(d >> 8), int(d & 0xFF))
+}
+
+type ID uint16
+
+func (id ID) String() string {
+	return fmt.Sprintf("%04x", int(id))
+}