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通过CCS8.3版本连接单板串口不稳定，有时候可以连接成功，但有时候又不能连接成功，不成功如下打印：
[Start: Texas Instruments XDS110 USB Debug Probe_0]
Execute the command:
%ccs_base%/common/uscif/dbgjtag -f %boarddatafile% -rv -o -S integrity
[Result]
—–[Print the board config pathname(s)]————————————
C:\Users\yutao\AppData\Local\TEXASI~1\CCS\
ti\1\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 'jioxds110.dll'.
The library build date was 'Nov 21 2018'.
The library build time was '00:08:45'.
The library package version is '8.0.903.2'.
The library component version is '35.35.0.0'.
The controller does not use a programmable FPGA.
The controller has a version number of '5' (0x00000005).
The controller has an insertion length of '0' (0x00000000).
This utility will attempt to reset the controller.
This utility has successfully reset the controller.
—–[Print the reset-command hardware log-file]—————————–
The scan-path will be reset by toggling the JTAG TRST signal.
The controller is the XDS110 with USB interface.
The link from controller to target is direct (without cable).
The software is configured for XDS110 features.
The controller cannot monitor the value on the EMU[0] pin.
The controller cannot monitor the value on the EMU[1] pin.
The controller cannot control the timing on output pins.
The controller cannot control the timing on input pins.
The scan-path link-delay has been set to exactly '0' (0x0000).
—–[An error has occurred and this utility has aborted]——————–
This error is generated by TI's USCIF driver or utilities.
The value is '-233' (0xffffff17).
The title is 'SC_ERR_PATH_BROKEN'.
The explanation is:
The JTAG IR and DR scan-paths cannot circulate bits, they may be broken.
An attempt to scan the JTAG scan-path has failed.
The target's JTAG scan-path appears to be broken
with a stuck-at-ones or stuck-at-zero fault.
[End: Texas Instruments XDS110 USB Debug Probe_0]
Nancy Wang：
建议先做一些交叉实验，交叉测试一下仿真器/usb线/usb端口，看一下有没有问题。
Chris Meng：
回复 Nancy Wang:
你好，
还可以尝试更换更大电流的电源适配器。
也有可能是硬件问题。请参考下面论坛讨论：
e2echina.ti.com/…/197624
