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USB high-speed signal issues when using ST-LINK usb port for powering the board. Use USB_FS port for power instead #23

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@bryanparadis
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Need to avoid using the st-link connector to power the board. It causes all kinds of crazy issues I spent a whole day diagnosing with my scope and usb packet analyzer.

Using the FS OTG port for power seems to work fine and works fine with ST-LINK plugged in at the same time. Didn't test 5V external input but I am expecting that will work as well.

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