lpcware

LPCUSBlib CDC Device Detection Taking Long Time in Window/Linux

Discussion created by lpcware Employee on Jun 15, 2016
Latest reply on Jun 15, 2016 by lpcware
Content originally posted in LPCWare by u14user on Wed Jul 17 08:29:18 MST 2013
Hi All,

Currently I am using LPC11u14 MCU with NXPUSBlib usb stack, CDC class. When I connected either to Windows/Linux, it take more than 10seconds before the USB-Comm Port is available for usage. Below is the dmesg in linux:
[ 5338.418039] usb 1-1.1: new full-speed USB device number 21 using ehci_hcd
[ 5353.467716] usb 1-1.1: device descriptor read/64, error -110
[ 5353.665374] cdc_acm 1-1.1:1.0: ttyACM0: USB ACM device

As shown above, it took 15seconds before the device is ready.

How can I shorten the device detection time.

Thank you very much.

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