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I want someone to help me from where i can study the firmware part. Also the sample code with explanation a simple code to just display the charecters to lcd would be enough. Also i am going to wright the linux drivers for the same functionalities which i would be exporting.
"BTW: the word is "write""
Wright.
By the way - there are no such program in existence, so you can't request someone to post it.
You will have to define a large number of commands, and then implement a firmware that decodes the received data and processes commands and parameter data.
For the prcessing of commands, it doesn't matter much if the commands are received through a serial port or through USB. A serial port sends data a character at a time and requires you to define some framing for breaking the data into individual commands. USB sends messages. But that difference is marginal from your point of view.
To the OP:
Since you said that, you are capable to write the Linux drivers, I assume you are familiar with GNU Tool-chain. And you said the MCU is LPC2148. Then I think LPCUSB project is good for you.
Check this: LPC214x USB stack
sourceforge.net/.../
lpcusb is a USB core stack for the built-in USB device of LPC214x microcontrollers. It handles the hardware interface and USB enumeration/configuration. Included are usage examples like USB joystick HID, USB virtual COM port and USB mass storage on SD-ca
( Don't know how to contact the authors of LPCUSB. )
Sample Code Bundle for LPC213x/LPC214x Peripherals using Keil's µVision (Dec 18, 2008)
ics.nxp.com/.../code.bundle.lpc213x.lpc214x.uvision.zip