craftsman1234 wrote:
Lodin_Erikson wrote:@LattePanda team
Please verify the pins at "Pinouts in area U1 are assigned to the X-Z8300 core." in
http://www.lattepanda.com/docs/#Inputs_and_Outputs

I tried to use the COM1 but at least I found signal "TxD" at pin 7 (NOT pin 6!) and signal "RXD" at pin 5 (NOT pin 8!).
Now I am not happy, because of my useless pcb layout...

Using a level shifter (MAX3373) and a RS485-Transciever with Auto-Direction (MAX13488) is working... when you use the right pins.
So once you changed the locations of the pins U1 did COM1 port then work under windows10?

Changed pin locations, using level shifter MAX3373 and RS485-IC MAX13488 : YES, COM1 is working in Win10
Tested with terminal software : Docklight

Edit : added 2 pictures and description

PCB
Bottom : LP
Middle-Center : Level shifter U2 (MAX3373) with wire correction to connector
Top-Center : RS485 transceiver (MAX13488) with TX/RX signal LEDs on the left

COM1_PCB__004.jpg (238.53 KiB) Viewed 11819 times

LP screen with TeamViewer on my PC. Terminal program "Docklight" is sending and recieving characters on COM1.

Screen_COM1_001t.JPG (165.04 KiB) Viewed 11819 times

attachments:

COM1_PCB__004.jpg

attachments:

Screen_COM1_001t.JPG

On-Board Serial Port (UART/RS232)