expanding nxpUSBLIB for LPC43xx

The USB controllers in the two families are the exact same blocks. You should be able to continue to use the LPC18xx build configurations in the LPCXpresso IDE and just change the MCU setting for the application to run your code on the LPC43xx family.

If you are using the Keil compiler you would change the device in the Device tab. FYI, you will need to increase the stack size from 0x200 to 0x800 bytes to get the host stack to work correctly with this compiler.

I will try to achieve this in LPCXpresso 4. So, I will change the MCU settings to "LCP4350" AND the target setting from Cortex-M3 to Cortex-M4/M0.

I think it should still be "__LPC18XX__" in C/C++ Build => Settings => MCU C Compiler => Symbols.

Compiling for and debugging on LPC4350 worked. Still the package has a strong LPC18xx flavor (Core M3 everywhere and consequently no FPU which I badly need). If I compile it with "FPv4-SP Soft ABI" option for floating point, I get a warning that floating point stuff gets generated for a chip without FPU. That's right. I tried to bind a dedicated driver lib for LPC43xx instead of CDL for 3 families, but it lacked "cr_startup" file and said ResetISR not found. And so on, and so on...

Which LPC43xx library should I take as a replacement for CDL in nxpUSBLIB package? I need FPU stuff badly, that;s why I got stuck with LPC43xx.

I've attached an experimental CDL for the LPC43xx. It will be in the next release but we have not integrated it into our example build configurations yet due to significant changes in the design of the underlying platform that are underway. These files were taken from the LPC43xx PDL located at sw.lpcware.com. Hope this helps.