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Help with MK20DX256VLL7 msd mfs generic host example from USB 4.1.1 not recognizing USB drive?

Question asked by Robert Hana on Aug 12, 2014
Latest reply on Aug 14, 2014 by jeremyzhou



  I have been able to build the example project "MK20DX256VLL7_msd_mfs_generic_host" from USB 4.1.1 in codewarrior 10.6 and I can load it onto the board through the debugger. I am using the TWR-K20D72M. I have disconnected the TWR-ELEV and TWR-SER (so im just using it as stand alone.) Jumpers J16 1&2 and 5&6 are connected. J2 1&2  and also J20 1&2 are set.


There is no USB activity. A USB stick is plugged into the device and there is no illumination, there is no blinking of any kind, it appears as though the USB port is dead. Would this indicate the USB stick is incompatible? Do I need to try a couple other USB sticks until I find one that works?


Can you suggest how I would debug this?  What should I be looking at? Where should I start ?(the hardware looks fine, resistors are in the right places, power is being sent to the micro-AB connector.)