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XDS100v3不稳定

TM4C1290,用XDS100v3,CCS7.1,在笔记本电脑上,WIn7 64位,偶尔能连接成功;
 

同样的板,换台式机,WIn7 32位系统,能稳定的运行。

是不是64位系统的原因?

下面是在笔记本电脑上的连接测试信息:

An error occurred while hard 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 '-232' (0xffffff18).
The title is 'SC_ERR_PATH_DR_MEASURE'.

The explanation is:
The measured length of the JTAG DR data path is invalid.
This indicates that an error exists in the link-delay or scan-path.

[End: Texas Instruments XDS100v3 USB Debug Probe_0]