SERIN2/SEROUT2 - first data received is always garbage

[HenrikOlsson]

Because the idle state of the serial line, for the mode you've selected, is high and you're driving the pin low when the PIC starts up. When the receiver sees that low it Thinks its the startbit and starts to shift in data which you aren't actually sending. That's the garbage you get. This happens BEFORE the execution of the SEROUT command which will THEN set it up properly for you.

If you, in your "startup code" set the pin you're going to use as the serial out pin high and then set it to output (as Ioannis showed) then the "line" idles at the correct state and the receiver isn't "triggered" until the SEROUT command actually exectutes.

Another (IMHO better) option is to NOT clear the TRIS bit for that particular pin.
That way it'll remain in high impedance mode until the SEROUT command actually executes - and it will set the pin to output AND set the idle state properly based on the MODE you select.

/Henrik.

[flotulopex]

Thanks a lot