Software USB for msp430

Hi all,

We are using an MSP430g2553 for a project and are looking for an implementation of software USB on the MSP430 platform, something that will allow us to communicate at low speed with the MSP430 without any need for external hardware.

Something like this http://dicks.home.xs4all.nl/avr/usbtiny/ , its for the atmel attiny micro controllers.

Thanks in advance,

Varun