k64 USB U-disk enumeration error

[omercaylan]

hi, we desing custom pcb with k64, we are trying to communite via usb, when usb disk attached, i get USB_HostEventEnumerationFail, when i examine the signal with oscilloscope, i get such a signal. Do you have any idea about this problem ? ide : McuXpresso sdk : 2.8.2

[omercaylan · Accepted solution]

Problem Solved: the schematic was wrong, . i connect 5v to k64 Usb reg. it worked.

[danielchen]

Hi

I would suggest you use USB analyzer to capture some USB packets.

Do you use OCARM or SDRAM as your first RAM in your project? Or DTCM as your first RAM?

Regards

Daniel

[bobpaddock]

Do the OE pins have internal pull-ups?  Such pins should not be floating.
The OSC could be randomly turning on and off.

[omercaylan]

actually i checked the OSCs. links like this. OSC output so I measure the clk voltage 5.1 volts, do you think this could be a mistake? OSC VDD 3.3v

[danielchen]

Hi omeroaylan:

Could you provide more information about your application , what changes did you make? what demo you are using?

Regards

Daniel

[omercaylan]

mcu : 144pin, MK64FN1M0VLQ12
we use external clock for usb and mcu. usb clk in : 47 - PTE26
we are only testing usb msd example.first we tested the code without any change on our circuit but did not work,
second we created a clean project for out 144 pin mcu and tested again(usb msd) but not a chance.
example working on nxp development board but not working our board.  i want to know, is this usb signal correct ?
it works until this function( USB_HostEvent() ) and i get enumeration error.