I need to use the serial console as a console, and then also use a 3.3V serial port to talk to a separate board.
The J17 UART port contains level shifted TXD/RXD signals, which is just what I need!
There’s a bunch of talk on the board about it also being “routed to the camera,” and recommendations for removing the camera module when using this UART.
Does the camera use the UART at all?
I hooked up an oscilloscope and checked, and nothing goes out on the UART TXD when the camera is used for capture.
(I can’t check the RXD because the camera port is after the level shifter input, which I can’t probe.)
Or is the recommendation just for signal quality reasons? I’m not worried about two additional inches of unterminated traces when running at 115200 bps, so if that is all, then I’m all set.
I’d like to know, for sure, what all the hubbub is about, though. Maybe I’m missing something?