K60 USB device code not working

[Ruds]

Hi all,

I have downloaded the USB device  code provided by freescale developers to my Cortex M4 K60 board where i have not used any external pullups and MAX3353EEUE IC for the circuit,

i made few changes in the code, those are

1.  Disabled weak pull downs ==> USB0_USBCTRL &= ~0x40;(Because DP line was detecting its Voltage up to +1.2V only) in USB.C

2. sellected Clock source as FLL insted of PLL in USB.H

3.defined NO_PLL_INIT = 1 in sysinit.C

my problems are

1.after running the program its contineously displays "Enter USB Reset handler"

please help me to solve this problem....

Thank you so much

[bugs]

We never get the USB working with FLL. you'd better use PEE mode.

Even don't try to use internal clock for UART, the baudrate difference is too big.