ATmega Hard UART Polarity

gmcge · Joined: 16 Mar 2007 Posts: 9

Hello

Is there a way to invert the serial data using the hard UART in the ATmega (168 specifically)?

Thanks!

albertsm · Joined: 09 Apr 2004 Posts: 5922 Location: Holland

not that i know off. only sw uart can do that.
you could best add a transistor to invert the signal.
or use for example pcint to invert the signal. but then you will need other pins.

gmcge · Joined: 16 Mar 2007 Posts: 9

Thanks Mark.

As I suspected. I implemented a soft UART and that is working fine for me.

-G

JC · Joined: 15 Dec 2007 Posts: 586 Location: Cleveland, OH

I am glad you solved your problem.

Another option is to switch to the Xmega micros.
One can set a flag to invert any I/O pin's output in hardware.

JC

heizer74 · Joined: 17 Jan 2006 Posts: 70

done that for infraredtransmission by using o logiclevel fet BSN20 in my project.