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I have a Nucleo-F746ZG and an F429ZI board, both of the board can be recognized by PC as a USB device via ST-LINK USB port.

However, due to project space limitation, I have to detach the ST-LINK and use the other USB connector(CN13 USER USB).

When I use the CN13 USB connector, I gave the board external power supply 12V to VIN as manual described, but there is no response on PC, not even the 'Unknown device', am I missing something there? Thanks.

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  • \$\begingroup\$ Do you have any firmware loaded onto the processor with USB device support? The on-board USB port requires firmware (possibly a boot loader) to operate as a USB device. \$\endgroup\$ – Dean Franks Mar 26 at 5:33

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