G400 PA25 Pull Down resistor value

If PA25 is left high or unconnected, the G400 uses USB for debugging. If it’s grounded then serial port is used for debug purpose. Should we put a pulldown resistor if we want serial debug? I plan to have a jumper to select or not the USB/Serial mode. On EMX a 2.2k resistor was inserted to ground the pin.

@ leforban - A pull down resistor is not absolutely necessary. A simple jumper to ground will be sufficient. However, if a pull-down is used, we do not recommend using this pin as an output.

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Hello Aron and thanks for your answer. This makes senses