LPC11U24 USB CDC Class source files and header files

[lpcware]

Content originally posted in LPCWare by saraswathi on Tue Jan 29 07:41:57 MST 2013
Hi,

I am new to LPCXpresso environment and trying to build an application on LPC11U24 board for communicating with the PC using USB connection. When I tried to create a project in LPCXpresso IDE, I didn't find any option to get the USB source and header files. But "LPC11Uxx_UserManual_10462" document mentions about CDC classs API names. Also, few of the example projects contains USB source and header files. Hence can you please let me know, how can I get the USB source and header files into my project. Is there a library which need to be included into the project to get the USB APIs.

With regards
Saraswathi C

[lpcware]

Content originally posted in LPCWare by Carter123 on Wed Apr 03 03:14:14 MST 2013
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[lpcware]

Content originally posted in LPCWare by saraswathi on Tue Apr 02 07:45:00 MST 2013
Hi All,

I am having a problem in recognizing the LPC11U24 device as USB CDC device in linux environment. I have used the sample code for USB CDC and developed a firmware image and flashed it on to a customized board with LPC11U24. When I connect this  board to a linux PC and use the command "dmesg" it will display the following text.

[B]usb 2-1.4: new full speed USB device using ehci_hcd and address [/B][B][COLOR=red]X
[/COLOR]usb 2-1.4: unable to read config index 0 descriptor/all
usb 2-1.4: can't read configurations, error -32[/B]
[B]usb 2-1.4: new full speed USB device using ehci_hcd and address [COLOR=#ff0000]X[/COLOR]
'[/B]
[B]'[/B]
[B]'[/B]
[B]cdc_acm 2-1.4:1.0: This device cannot do calls on its own. It is not a modem.
cdc_acm 2-1.4:1.0: ttyACM0: USB ACM device[/B]

i.e., the linux PC sometimes recongnizes the customized board as a USB device and sometime it fails to recognize. When it fails the error message is
[B]"usb 2-1.4: unable to read config index 0 descriptor/all"
"usb 2-1.4: can't read configurations, error -32"[/B]
I am using same configuration information used by USB CDC example code.

Does anyone know the reason for this failure?

Thanks in advance.

With regards
Saraswathi C

[lpcware]

Content originally posted in LPCWare by saraswathi on Tue Apr 02 06:29:43 MST 2013
Thank you for sharing the link. The USB CDC source code helped me a lot during the development.

[lpcware]

Content originally posted in LPCWare by Tsuneo on Thu Jan 31 19:42:43 MST 2013
As of the usage of USB on-chip drivers, refer to USB_ROM_CDC example in this code bundle.

"Sample Code Bundle for LPC11Uxx Peripherals using LPCXpresso"
http://www.lpcware.com/content/nxpfile/sample-code-bundle-lpc11uxx-peripherals-using-lpcxpresso

Tsuneo