* `Serial.begin` = `串口_打开` * `Serial.available` = `串口_读长度` * `Serial.read` = `串口_读数据` * `Serial.flush` = `串口_刷新` * `Serial.print` = `串口_发送` * `Serial.println` = `串口_发送1` * `Serial.write` = `串口_写出` * `peak` = `串口_下个数据`