lpc2378 usb not recognized

[lpcware]

Content originally posted in LPCWare by jalila211 on Tue May 27 07:53:33 MST 2014
hi
in my custom board, i connect 2 resistance to usb+ and usb- with 33 ohm value and connect directly 1.5k between usb+ and 3.3v. i use lots of example for hid usb but in all of them usb wasnt recognized by windows.
please help me
schematic and firmware is atached

Original Attachment has been moved to: USBHID%20-%20Test.rar

[lpcware]

Content originally posted in LPCWare by embd02161991 on Thu Jun 19 21:50:36 MST 2014
HI,

Please refer to the schematics of the MCB2300

http://www.keil.com/mcb2300/picture.asp

Referring to the schematic on USB of MCB1800/4300 will also help.

http://www.lpcware.com/content/nxpfile/keil-mcb1800-mcb4300-schematic

Make sure you follow the USB guidelines for full speed and PCB routing guidelines for USB. LPC15xx USB certification support pack would contain the routing guidelines.

http://www.lpcware.com/content/nxpfile/an11392-guidelines-full-speed-usb-nxps-lpc-microcontrollers

http://www.lpcware.com/content/nxpfile/lpc1549-usb-certification-support-pack