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Configure GPIOs PA11 and PA12 to USB D+ and D-

Question asked by xol.xol on Jul 11, 2016
Latest reply on Aug 2, 2016 by Mike xx
I'm working with STM32F070xB
I need to configure GPIOs PA11 and PA12 to USB D+ and D- alternate function. According to datasheet it is listed as Additional functions (not Alternate) USB_DM and USB_DP.
It is not clear how to configure these GPIO for USB functionality. If they are not Alternate functions so how can I reach desired functionality?
We are not using Standard Peripheral Library. I need explanation in terms of GPIO port registers.

Thanks.

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