j.tang wrote:
>
> Hello guys:
>     I am now dealing a project that need two pics to communicate by using hand
> shaking . Can somebody warmhearted give me some program or tips to do this.
> I use porta bit 1 and 2 as hand shaking line.
>                          thank you

Hi there,
Depending on what type of pic you are using (with or without uart) you
can just send serial back and forward.
If you dont have a uart the other chip depending what else it is doing
may be too busy to get back in time to see the start of a serial bit.
In these cases you can get sneaky and use the rx line comming from the
other chip as a request for attention, eg pull it low and leave it low
until you receive data comming from the other chip. while it is low you
will have to keep a close watch on incomming data.

regards,
--
Lee McLaren                          lmclaren@trumpet.com.au
Comstra pty. ltd.                    lmclaren@comstra.com.au
2 Kirksway place                     phone       03 62244488
Hobart Tasmania                      fax         03 62244601
Australia 7000                       mobil       018 138682

'It was five hours of Boggs's "channelling". After three hours
I asked him to summon up the soul of Jimi Hendrix and requested
All Along the Watchtower. You know, the guy's been dead
twenty years but he still hasn't lost his edge'
Mulder