connect two pics

[soki]

Thank you for your replies.

When I say it doesnt work well I mean when I make a program for big PICs and I want for example rotate one dc motor right then pause 2 sec then rotate left pause 3 sec etc, it just dont work or work wrong, for example it will rotate only right and then stop working at all or if its a big loop it maybe stop in the middle of the program.With small pics it works like champion.


Are there some examples with serial communication? I tried to find the "sixpics" project someone mention but there isn't in melabs program examples.

Thank you very much.

[skimask]

When I say it doesnt work well I mean when I make a program for big PICs and I want for example rotate one dc motor right then pause 2 sec then rotate left pause 3 sec etc, it just dont work or work wrong, for example it will rotate only right and then stop working at all or if its a big loop it maybe stop in the middle of the program.With small pics it works like champion.

Quite frankly, to me, that just doesn't make any sense. But, I'll bet, I'd just bet, if, and only if, you posted the code that you used in both PICs, the one that worked and the one that failed, you might, just might, get a quick answer as to why one works and the other one seems to fail.
But that would be just too easy...

Are there some examples with serial communication? I tried to find the "sixpics" project someone mention but there isn't in melabs program examples.

Ya know what works for me?
Typing 'Serial Communication between 2 PICs' in the Search box.
Crazy how that works ain't it?

[mackrackit]

I agree with Jumper, find the problem.
Maybe post the problem code??

SERIAL-- really simple example . Much more to add, but the basic idea.
SEND

SEROUT2, PORTX.X, MODE,[DEC 9]

RECEIVE

SERIN2, PORTX.X, MODE,[DEC VAR]
IF VAR = 9 THEN LABELX

[Jumper]

If you have connected anything on PORTA and you dont get the results you want.... this one I leave for Melanie to answer if needed :-)

Show us your HW setup and some code, it should not be rocket science to rotate a DC motor with the 877A.

So dont give into Plan Z just yet.

/me

[soki]

The program I put in both small and big pics are the same,not different programs! On small pics it work on big not well!

[skimask]

The program I put in both small and big pics are the same,not different programs! On small pics it work on big not well!

And there are hardware differences between the two PICs...
Is there some reason why we shouldn't see your program? State secret or something?

[Jumper]

The bigger PIC has tons of nice functions and these needs to be disabled/enabled/taken care of/set up/deactivated......etc

So tell us what you have connected where and all your regiter settings.. TRIS ADCON etc if you think your code it too big/secret to post here.

But if you insist of doing a 2 pic project feel free. And if you do that.. why use serial communication when it should be enough to use 2 pins as input on the small pic... as long pin-xx is high rotate left, if pin-yy is high rotate right...

but... naaah.... if you already have code working for a small pic... what PIC is that? It cant be a 16F84 since that has no A/D....

the plot thickens

/me

[soki]

You guys are great and have humor!

Thank you for your answers!

How wrong I can be with that simple program?

TRISB = 0 ' PORTB is output
PORTB.0 = 1 'enable1 of L293d is always high so input 1 and input 2 are available
start:
PORTB.1 = 1 'input1 of l293d goes high, so output 1 goes high so turns left
PORTB.2 = 0 'input2 of l293d goes low, so output 2 goes low so turns left
pause 2000
PORTB.1 = 0 'the opposite, turns right
PORTB.2 = 1
pause 3000
PORTB.1 = 0 'stop the dc motors
PORTB.2 = 0
goto start 'loop

[skimask]

So what's the problem?