lpcware

Boot from USB help

Discussion created by lpcware Employee on Jun 15, 2016
Latest reply on Jun 15, 2016 by lpcware
Content originally posted in LPCWare by jb111 on Sun Dec 13 20:23:43 MST 2015
Hi,

I am trying to boot from USB0, but am having some difficulty.

My setup is a s follows:
- LPC1837
- LPCXpresso
- Ubuntu 15.04

I am happy with the hardware connections. I have verified that USB0 is working by running the Virtual communication port example. The pins to select the boot mode (P2_9, P2_8, P1_2,  P1_1) have been checked to be fine (low, high, low, high respectively.)

When I hold the boot pin(P2_7) low on a reset I can see the micro entering the bootrom (flashing LED stops flashing).

But  when I run lsusb or dmesg I dont see anything. My understanding is that the USB should enumerate as a DFU device. Is this correct? Is there anything else I have missed?

Thanks.

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