2023-02-25 03:00 PM
Good to see some familiar fac... AVATARS still here!
We have some products that use the mentioned ST micro. They were using the ST supplied virtual com port USB example code and drivers from back in the Cube 1.6 days. We've seen this occurrence in 2 different products.
BOTH instances were completely resolved by using another pin. I see in the specs that PC13, 14,and 15 are a bit "SPECIAL" . We've nailed the crystal to the LAST two. But I don't see how we were violating any ratings on PC13 and don't see its internal relationship with USB . Until something is found concrete about this - which I have no time to look at, just beware if you use this pin and USB.
Best to you all!
2023-02-26 04:17 AM
2023-02-26 06:41 AM
That sounds like experience speaking! Thanks for more clues and possibilities gbm. By HANG I assume you mean just the USB TRANSMIT functionality would hang. This is what we observed. The devices were still Receiving USB and Doing IO interactions. Just NO USB TRANSMIT back to HOST. Appreciate the feedback!