Posted on June 06, 2018 at 22:24You'll need to pick a max speed that permits a 48 MHz USB clock, use an external phy, or pick a more current part supporting alternate CLK48 sources (say like a F446 ?)
There are F7 and L4 parts that also address this via multiple PLL and MSI/HSI48 sources.
If this is non-commercial tooling around, the F429 will probably clock at 192 MHz, which could get you a 48 MHz Q clock.
For examples, find something architecturally close, and port it over
STM32Cube_FW_F4_V1.21.0\Projects\STM324x9I_EVAL\Applications\USB_Device
