4 years ago.

FRDM-K64F UART and VIN power supply

Hi, i'm developing on a project that uses a lot of UARTs on the board. When i use my PC's USB port to supply the FRDM-K64F all UARTs works fine, but when i try to supply the board using VIN pin (5V) seems that UARTs communications are loopbacked, like that RX and TX pins were shorted.

I tried also to supply the board using USB connector with an external USB charger but it did the same thing.

It works correctly only with PC's USB port connected.

Thank you!

Then you did something wrong. Without more information we really can't give more useful feedback.

posted by Erik Olieman 22 Jan 2016
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