nxpUSBlib cdc issue

lpcware — Wed, 15 Jun 2016 19:38:58 GMT

Content originally posted in LPCWare by mrob on Mon Oct 22 16:47:30 MST 2012
Hello,

Has anyone here had success using the nxpUSBlib VirtualSerialDevice demo? I'm using v0.97 of the nxpUSBlib, and I'm having some issues.

I have a simple Visual Basic terminal program that has been working great for a few years. When I open the virtual com port from my device, communication seems to work just fine. The issue is when I try to close the port, I get an exception "IOException was unhandled" "A device attached to the system is not functioning."

From some testing, this only seems to be an issue if I send more than 8 bytes to the port at one shot. If I send a string of 8 or less the port closes fine, but if I send 9 or more I get the error.

I tried the demo's mentioned here: http://www.lpcware.com/content/forum/usb-rom-driver-examples-using-lpcxpresso-lpc11uxx
Those seem to close just fine, but the drivers needed re-installation each time the device was plugged in.

I'm trying to compare the two examples to see what they have different or in common. Does anyone have any suggestions on where to look?

Re: nxpUSBlib cdc issue

lpcware — Wed, 15 Jun 2016 19:38:59 GMT

Content originally posted in LPCWare by nxpUSBlib team on Wed Nov 07 13:27:59 MST 2012
Which part and which compiler are you using?
What is the baud rate?

Re: nxpUSBlib cdc issue

lpcware — Wed, 15 Jun 2016 19:38:59 GMT

Content originally posted in LPCWare by hoangdat.tran on Mon Apr 07 09:53:20 MST 2014
You can change #define ROMDRIVER_CDC_MEM_SIZE0x08 (in file Endpoint_LPC11Uxx.h) to #define ROMDRIVER_CDC_MEM_SIZE0x64

In my side, It done.

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