PIC32MX575F256H USB未在主机中检测到

大家好，我们正在研究PIC32 MX575 F256H，我们最近从100PIC版本（PIC32 MX575 F512L）转换到64引脚版本，USB在100引脚版本中工作得很好，我们面临一个64针版本的问题。这里有详细的问题：1）硬件电路是相同的两个控制。2）设备没有被主机（Windows PC）检测到。3）VBUS测量的电压是5V。4）我们探测了CRO中的D+和D信号线，它没有变化，都在0V。5）UBID是接地的。6）VUSB3V3连接到3.3V.7）。CT在和谐V1.8，控制从来没有到“AppuSubDeVeEvestHANDLER”。我已经附上图像从示意图找到同样的，并帮助我们解决这个问题。



      以下为原文

    Hello all,

We are working on PIC32MX575F256H, we recently shifted to 64pin version of this controller from 100pic version(pic32mx575f512l), USB was working fine in 100 pin version, we are facing a problem with 64-pin version.

Here are the Details of issue:
1) Hardware circuit is same for both controllers.
2) The device is not being detected by the host(Windows PC).
3) The voltage measured at vBUS is 5V.
4) We probed the D+ and D- signal lines in CRO, which shows no variations, both are at 0V.
5) USBID is grounded.
6) VUSB3V3 is connected to 3.3V.
7) In the code which we took from vendor example project in hARMony v1.8, control never comes to 'APP_USBDeviceEventHandler'.

I have attached images from schematic kindly find the same and help us to solve this.

   Attached Image(s)