Page 1 of 1
STM32F417 USB-CDC
Posted: Tue Mar 18, 2014 10:37 am
by Tabulous
Should i be needing to put an external pull-up on D+ line to get USB working ? or should the pull happen internally ?
Re: STM32F417 USB-CDC
Posted: Tue Mar 18, 2014 10:43 am
by Giovanni
On the F4 there is an internal resistor, see the existing demos.
Giovanni
Re: STM32F417 USB-CDC
Posted: Thu Mar 20, 2014 6:13 pm
by Tabulous
Does VBUS need to be connected for Internal pull to work ?
As on my design i did not connect VBUS to PA9. All the USB works ok but i had to put an external 1K5 pullup on D+ for it to work
Re: STM32F417 USB-CDC
Posted: Thu Mar 20, 2014 6:37 pm
by Giovanni
Not sure about the connection details, you could look at the F4 Discovery schematic for a reference.
Giovanni