F405-Wing: How to connect GPS to UART4?

@jCat wrote:

Hi,

I am tring to wire my plane by sugguested “F405-WING General Wiring figure” (http://www.mateksys.com/?portfolio=f405-wing#tab-id-3).

This figure is for INAV, I am using ardupilot with Mission Planner. I would like use Serial 4 for main GPS, as shown in above figure.

When I connect my GPS to UART3, everything is fine. I got a “NoFix” message cause I am indoor.
When I connect the same GPS to UART4, I got “NoGPS” message.

I tried to modify parameters below:
SERIAL3_PROTOCOL 5-> -1 disble gps@Serial3
GPS_AUTO_SWITCH 1->3
GPS_TYPE 1->0
GPS_TYPE2 0->1

What shold I do?
Thanks a lot

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