Hello Andres,

I don't know which is the "best", because each serial protocol has its advantages and disadvantages... I'm using the SPI to connect to additional hardware, and a level shifter to meet the voltage requirements of my hardware.

Dave Hylands wrote:
HI Andres,

On Tue, Jun 29, 2010 at 7:01 AM, Andrés Camarena <amco1027@gmail.com> wrote:
I am using a gumstix overo with the summit pack. I'm looking for a
simple, very detailed tutorial or sample code to enable serial
communication for use with an xbee. Is UART1 the best serial port to
use? Does sertest.c by chance do what I'm asking?

I believe that it should.

And as Victhor suggested, you'll need some type of voltage conversion.