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f407 usb transfer problem

Question asked by shen.cheng on Feb 19, 2014
Latest reply on Feb 28, 2014 by sung.chen_chung
Hi,i want to make a f4 USB driver and i got a problem that when i run my program the computer can identify the USB device but cant transfer data between it, i try to trace the program and found the interrupte(DCD_HandleOutEP_ISR and DCD_HandleInEP_ISR) didn't trigger all my program is based on VCP example, the example works totally fine so i need some help

the attached file is my program and usb driver for it

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