move back to serial

common/serial/serial.go

@@ -0,0 +1,32 @@
+package serial
+
+import (
+	"encoding/binary"
+	"io"
+)
+
+func ReadUint16(reader io.Reader) (uint16, error) {
+	var b [2]byte
+	if _, err := io.ReadFull(reader, b[:]); err != nil {
+		return 0, err
+	}
+	return binary.BigEndian.Uint16(b[:]), nil
+}
+
+func WriteUint16(writer io.Writer, value uint16) (int, error) {
+	var b [2]byte
+	binary.BigEndian.PutUint16(b[:], value)
+	return writer.Write(b[:])
+}
+
+func WriteUint32(writer io.Writer, value uint32) (int, error) {
+	var b [4]byte
+	binary.BigEndian.PutUint32(b[:], value)
+	return writer.Write(b[:])
+}
+
+func WriteUint64(writer io.Writer, value uint64) (int, error) {
+	var b [8]byte
+	binary.BigEndian.PutUint64(b[:], value)
+	return writer.Write(b[:])
+}