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I have a TWR-K20D50M board,  USB Host documentation is wrong!

Question asked by Alan Trowbridge on Jun 24, 2016
Latest reply on Jul 5, 2016 by Daniel Chen

In the MQX documentation for the TWR-K20D50M board it states "For using USB Host mode, jumpers on position: TWR-K20D50M board, J26 on position 1-2 (That's correct), TWR-K20D50M board, J30 on position 5-6 (VREGIN)."  This last jumper J30 5-6 IS INCORRECT.  That position, when the TWR board is hooked up to a USB Device (like a mouse) leaves the MCU UNPOWERED.  J30 5-6 powers the MCU from the micro USB port.  A USB Device has no power!  When connected to a PC having J30 on position 1-2 powers the MCU with 1.8 volts.When connected to a PC having J30 on position 5-6 powers the PC with anywhere from 5.2 to 6.5 volts (PC USB Powered).