lpcware

USB Mass Storage Host Enumeration

Discussion created by lpcware Employee on Jun 15, 2016
Latest reply on Jun 15, 2016 by lpcware
Content originally posted in LPCWare by mb1391 on Tue Feb 11 01:49:48 MST 2014
Hi,

I am using nxpUSBlib v0.98b and LPCExpresso v6.1.0 for USB Mass Storage Host implementation on LPC17xx-40xx.
I have an issue regarding USB Mass Storage Device enumeration using LPCUSBLib.
When the target hardware detects voltage change on USB port, it invokes the enumeration sequence.

I have a USB flash drive to enumerate and I attach it to my hardware in OFF condition.
When I power ON my target hardware, it doesn't detect the voltage change on port and doesn't enumerate.

My application requires this kind of enumeration where there will be a USB flash drive attached and the hardware will have frequent power cycles.

How can this problem be fixed at driver level?

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