hanya

STM32F1 is pretty old as STM32 and it is known which has different register mapping. USB D+ line has pull-down resistor in the schematic but recent STM32 contains this pull-down...

@sypl You can have a look at the schematic of STM32F072 Discovery kit: https://www.st.com/content/ccc/resource/technical/document/user_manual/3b/8d/46/57/b7/a9/49/b4/DM00099401.pdf/files/DM00099401.pdf/jcr:content/translations/en.DM00099401.pdf You do not need the following components in the schematic shown: - R10, pull-down of the...