When powering a F3Discovery (rev.D) board through the USB-USER port, there is a 2 second gap in the MCO clock signal (coming form the ST-LINK chip). See sceenshot1 (ch1=5V , ch2=MCO at SB12). When power is applied there is about 20ms worth of clock-c...

Hello,I have used USB-CDC for some time. All STM32F3 discovery boards are rev.B (MB1035B). Recently I purchased a new one, which turned out to be a revision D  (MB1035D) .Running the same code on the new board gives the famous 'USB device not recogni...