STM32f2 working USB device example needed

[Kerry Berland]

We've come across this issue bringing up a new board based on an STM32F205. We had set AHB bus speed to 24 MHz. USB didn't work. We raised it to 48 MHz, and now it works. It appears that the ST errata sheet, which specifies minimum of 14.2 MHz, may not be correct. It looks as though Giovanni's comment, minimum speed of 30 MHz, may be correct. We've communicated this to ST today for confirmation but haven't yet gotten a response.