USB not connecting from VCOM CDC example

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USB not connecting from VCOM CDC example

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randylee
Contributor IV

Using an LPC55S16 dev board and wanting to talk CDC VCOM out on the USB FS port.

Using MXCUexpresso 11.2 and SDK 2.8.2

Pulled in the lpcxresso55s16_dev_cdc_vcom_bm and the lite version of this, compiled (without problems) and ran it out onto the board. Board is being powered by the debug interface so is providing a vcom for that (LPC-Link II UCom Port) just fine, it looks like.

The problem is that neither of these stock, out of the box things will connect on either of the USB ports.  Windows (10) shows an error of Unkown USB Device (Device Descriptor Request Failed) which tells me it doesn't get real far here...

Any ideas?  Neither of these stock projects works out of the box....

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randylee
Contributor IV

Ah, found it! I had this plugged into a hub and that was causing problems apparently. Plugging it directly into my machine and it enumerates correctly!

Why that would be is a mystery that I'd like to know about at some point tho...

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244 Views
randylee
Contributor IV

Ah, found it! I had this plugged into a hub and that was causing problems apparently. Plugging it directly into my machine and it enumerates correctly!

Why that would be is a mystery that I'd like to know about at some point tho...

View solution in original post

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