USBUART（CDC）PSOC5LP检测USB断线

大家好，
在阅读论坛和例子，并在几个问题的USB驱动程序，现在我能够使用USPUART（CDC）接口与PSoC5LP！
它仍然只是一个问题：管理USB电缆的连接/断开。
我读KBA210620：
HTTP://OrgIn www. CyPur.com /知识基础文章/故障排除PSOC-3-PSOC-4-L系列和PSOC-5LP-USB设计-KBA210620
此文档建议监视VBUS线路以检测断开事件。
但是，在我目前的设计中，我不能监控VBUS线（自供电-没有VBUS）。
我做了一些实验，但我不走运。
有人知道在没有监视VBUS线路的情况下检测USB断开（USPADAR-CDC）的解决方案吗？
提前感谢大家；
PS:UBART组件数据表V.3.20没有定义UBuTARGETGETFIONtiON（）API



     以下为原文
  Hi to all,
after reading forum and examples and after a couple of problems regarding USB drivers, now I am able to use USBUART (CDC) interface with PSoC5LP!

It remains only a problem: manage the connection/disconnection of the USB cable.

I read KBA210620:
[url=https://community.cypress.com/external-link.jspa?url=http%3A%2F%2Forigin-www.cypress.com%2Fknowledge-base-article%2Ftroubleshooting-psoc-3-psoc-4-l-series-and-psoc-5lp-u***-designs-kba210620]http://origin-www.cypress.com/knowledge-base-article/troubleshooting-psoc-3-psoc-4-l-series-and-psoc-5lp-u***-designs-kba210620[/url]
This document suggest to monitor the VBUS line to detect the disconnection event.

But, in my current design, I cannot monitor the VBUS line (SELF POWERED - NO VBUS).

I did a bit of experiments but I was not lucky.
There is someone that knows a solution to detect USB disconnection (USBUART - CDC) without monitoring the VBUS line?


Thank you in advance to all ;-)

PS: UBUART component datasheet v.3.20 does not define USBUART_GetConfiguration() API