最近在用 spectrum digital XDS560 V2 STM Emulator做tracePod， CCS版本是5.4，DSP型号:TCI6638. 在用CCS做test connection时，总是会出现如下错误：
[Start]
Execute the command:
%ccs_base%/common/uscif/dbgjtag.exe -f %boarddatafile% -rv -o -F inform,logfile=yes -S pathlength -S integrity
[Result]
-----[Print the board config pathname(s)]------------------------------------
C:\DOCUME~1\TDLTE-~1\LOCALS~1\APPLIC~1\.TI\
693494126\0\0\BrdDat\testBoard.dat
-----[Print the reset-command software log-file]-----------------------------
This utility has selected a 560/2xx-class product.
This utility will load the program 'sd560v2u.out'.
Loaded FPGA Image: C:\ti\ccsv5\ccs_base\common\uscif\xds560v2pro.xsvf
The library build date was 'Apr 2 2013'.
The library build time was '00:13:51'.
The library package version is '5.1.73.0'.
The library component version is '35.34.40.0'.
The controller does not use a programmable FPGA.
E_RPCENV_IO_ERROR(-6) No connection: DTC_IO_Receive::dtc_io
E_RPCENV_IO_ERROR(-6) No connection: DTC_IO_Receive::dtc_io
E_RPCENV_IO_ERROR(-6) No connection: DTC_IO_Send::dtc_io
-----[An error has occurred and this utility has aborted]--------------------
This error is generated by TI's USCIF driver or utilities.
The value is '-252' (0xffffff04).
The title is 'SC_ERR_ECOM_OPERATE'.
The explanation is:
An attempt to operate the USCIF interface via USCIF ECOM has failed.
[End]
不知道这个错误代码-252表示什么意思
