Hi Kevin,
Please download the lpcopen software Rev.2.20 for MCB4357 board from here.
You could find the USB0 lpcusblib host example with below path:
\lpcopen_2_20_keil_iar_keil_mcb_4357\applications\lpc18xx_43xx\iar\keil_mcb_4357\lpcusblib_host\usbhost_keyboard
Wish it helps.
Have a great day,
Mike
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