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Best Library

Note: This was originally posted on 17th March 2010 at http://forums.arm.com

I must begin to develop on a Cortex M3 NXP LPC1758.
I must to implement USB device, I / O, UART, PWM
I would like some impression on the best easiest and least expensive tools to develop.
Moreover what libraries are simpler and Real Time functioning well ?

Keil? LPCXpresso?

Thanks