2025-05-06 12:25 AM
Hello,
I'm using in my projects with ports PA10,PA11 (for Logs - uart), and PB14 and PB15 as normal GPIO.
They didn't works.
After long troubleshooting.... I found out that is because these ports are supply separately by the VDDUSB pin which was disconnected.
I couldn't find the reason in the datasheet, I'll be happy to understand the construction and the reason.
2025-05-06 1:58 AM
Hi,
reason...ask chip designer, why separate VddUSB ...maybe, to be more flexible, if chip runs on 1,8V, the USB related pins still have to work on 3v3 ; so can supply separate, if needed;
and see ds : General operating conditions