For the past 6 months I've been debugging an LPC1778 based target using a Keil ULink 2, running uVision 4.0 under Windows 7. Recently I had the need to do performance profiling, and I've tried to upgrade to a ULink Professional. I switched out the debugger device. Under uVision I switched both the flash and the debug debuggers from ULink 2 to ULink Pro. However, when I try to flash my target, or I tried to initiate a debug session I get the blue light that I expect, but then I get "USB Communication Failure." I'm running uVision 4.72, from which I manually installed the driver for the Pro (under the ARM folder.)
Is it likely there is something physically wrong with my debugger? Is there a USB setting which needs to be reconfigured?
Regards, Eric T.
Not sure of the exact design difference, but this world is full of USB 1.1 cables originating from the 12Mbit/s time.
So way slower than the 480Mbit/s of the newer transfer speed of USB 2.