AnsweredAssumed Answered

hs / fs usb, discovery f4

Question asked by belchamber.ian on May 30, 2013
Latest reply on May 30, 2013 by Clive One
I believe that FS is USB1 and HS is USB2. I have FS running in my project but can't seem to get HS running.

I can run this ST sample on the f4 discovery board:

I have to change the define of PLL_M from 25 to 8 in system_stm32f4xx.c to run on this board.

Then, if I just select the STM324xG-EVAL_USBD-FS workspace and run, I get ST Microelectronics Virtual COM Port appear in my device list, and it works fine with my PC app.

But if I change the workspace to STM324xG-EVAL_USBD-HS and run, I don't get a com port appear in the device list.

Why can't I use HS? Just a thought, is it anything to do with hardware config, pullup resistors??