avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0x01
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 2 of 10: not in sync: resp=0x01
（一直到10 of 10然后报错退出）
原因是arduino莫名其妙地死机了
有时有效的方案：在快upload时按reset