I made a board with LPC4320. I set the boot pins as USB0. But when I connect the board with PC, nothing happens. There is no USB device recognized, let alone entering DFU mode.
Did I miss something? Is there anything need to be set when booting the MCU for the first time? Install some drivers for example. Or I should just check my soldering?
Could anyone help me?
Many thanks!
Hi Lifan,
The USB0 boot mode requires that a 12 MHz external crystal is connected to the XTAL1/2 pins. The boot code configures the CGU accordingly. The USB clock is respectively set to 480 MHz or 60 MHz.
Hope it helps!
Best Regards,
Carlos Mendoza
Technical Support Engineer
Hi Carlos,
Thanks for help.
So the external crystal should start to work when booting with the boot pins set as USB0, right?
I checked the crystal, it's not vibrating. I‘ll look into it.
Regards,
Lifan
Hi Lifan,
Yes, please let us know if it works!
Best Regards,
Carlos Mendoza
Technical Support Engineer