系统运行时间为开发板上电开始运行程序时刻到当前时刻的时间程序开始时间为0上传程序观察串口输出Serial115200Serialprintlnmillisdelay1000dm9pZCBzZXR1cCgpewogIFNlcmlhbC5iZWdpbigxMTUyMDApOwp9Cgp2b2lkIGxvb3AoKXsKICAvL+ezu+e7n+i/kOihjOaXtumXtOS4uuW8gOWPkeadv+S4iueUteW8gOWni+i/kOihjOeoi+W6j+aXtuWIu+WIsOW9k+WJjeaXtuWIu+eahOaXtumXtAogIC8v56iL5bqP5byA5aeL5pe26Ze05Li6MAogIC8v5LiK5Lyg56iL5bqP6KeC5a+f5Liy5Y+j6L6T5Ye6CiAgU2VyaWFsLnByaW50bG4obWlsbGlzKCkpOwogIGRlbGF5KDEwMDApOwoKfQ==