串口发送方式改为no分别上传一个带a结尾和不带a结尾的字符串，观察时间差异Serial9600Seriallocal_variate时间unsigned longmillisSerialprintlnSerialaSerialprintlnMINUS1millis1时间dm9pZCBzZXR1cCgpewogIFNlcmlhbC5iZWdpbig5NjAwKTsKfQoKdm9pZCBsb29wKCl7CiAgLy/kuLLlj6Plj5HpgIHmlrnlvI/mlLnkuLpubwogIC8v5YiG5Yir5LiK5Lyg5LiA5Liq5bimYee7k+WwvuWSjOS4jeW4pmHnu5PlsL7nmoTlrZfnrKbkuLLvvIzop4Llr5/ml7bpl7Tlt67lvIIKCiAgaWYgKFNlcmlhbC5hdmFpbGFibGUoKSA+IDApIHsKICAgIHVuc2lnbmVkIGxvbmcgX0U2Xzk3X0I2X0U5Xzk3X0I0ID0gbWlsbGlzKCk7CiAgICBTZXJpYWwucHJpbnRsbihTZXJpYWwucmVhZFN0cmluZ1VudGlsKCdhJykpOwogICAgU2VyaWFsLnByaW50bG4oKG1pbGxpcygpIC0gX0U2Xzk3X0I2X0U5Xzk3X0I0KSk7CgogIH0KCn0=