各位工程师您好，为什么在往DSP中下载程序时出现下面连接错误，一开始是可以下载的，不知怎的突然不可以了
[Start: Texas Instruments XDS100v2 USB Emulator_0]
Execute the command:
%ccs_base%/common/uscif/dbgjtag -f %boarddatafile% -rv -o -F inform,logfile=yes -S pathlength -S integrity
[Result]
-----[Print the board config pathname(s)]------------------------------------
C:\Users\intel\AppData\Local\TEXASI~1\CCS\
ti\0\0\BrdDat\testBoard.dat
-----[Print the reset-command software log-file]-----------------------------
This utility has selected a 100- or 510-class product.
This utility will load the adapter 'jioserdesusb.dll'.
An error occurred while soft opening the controller.
-----[An error has occurred and this utility has aborted]--------------------
This error is generated by TI's USCIF driver or utilities.
The value is '-151' (0xffffff69).
The title is 'SC_ERR_FTDI_OPEN'.
The explanation is:
One of the FTDI driver functions used during
the connect returned bad status or an error.
The cause may one or more of: invalid emulator serial number,
blank emulator EEPROM, missing FTDI drivers, faulty USB cable.
Use the xds100serial command-line utility in the 'common/uscif'
folder to verify the emulator can be located.
[End: Texas Instruments XDS100v2 USB Emulator_0]
