Add a VBUS_DETECT pin, if for nothing else, power-management (so we know when we can power-down the USB peripheral in the STM32). A voltage-divider (15K/22K split) from VBUS to a GPIO should do fine for that. See http://community.paxinstruments.com/t/pax-instruments-multilogger/167
Add a VBUS_DETECT pin, if for nothing else, power-management (so we know when we can power-down the USB peripheral in the STM32). A voltage-divider (15K/22K split) from VBUS to a GPIO should do fine for that. See http://community.paxinstruments.com/t/pax-instruments-multilogger/167