at91sam7s64 to do with the USB port with an RS232 device: PC on the driver source code under KEIL a simple user' s manual is a good learning materials... ARM-PowerPC-ColdFire-MIPSC++
at91sam7sE test code for interfacing HID devices like USB mouse with Atmel ARM7 CPU using GNU, unlike IAR, GNU is free SW which can available to everyone... ARM-PowerPC-ColdFire-MIPSC++