日志信息：
HOST_FDL Change Baud
2020-06-20 01:25:57.457 usb_device.py:1140 INFO
FDL2 Connecting
2020-06-20 01:25:57.468 usb_device.py:1140 INFO
FDL2 Change Baud
FDL2 Downloading...
2020-06-20 01:25:57.547 usb_device.py:1140 INFO
_BKF_NV Reading Flash
2020-06-20 01:25:57.680 usb_device.py:1140 INFO
[ERROR] DownLoad Failed: Verify error, Elapsed Times = 2s
2020-06-20 01:25:57.683 usb_device.py:251 ERROR 下载失败
2020-06-20 01:25:58.733 usb_device.py:1378 INFO quit download
2020-06-20 01:25:58.740 usb_device.py:1368 INFO enter Trace
2020-06-20 01:25:58.746 usb_device.py:647 INFO sleep 2.7997491359710693 sec
2020-06-20 01:25:58.752 usb_device.py:651 INFO sleep done
2020-06-20 01:25:59.255 usb_device.py:647 INFO sleep 2.2900636196136475 sec
2020-06-20 01:26:01.549 usb_device.py:651 INFO sleep done
