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'[PIC]: does serial coms require any extra parts?'
2001\11\12@032616 by James Fitzsimons

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Hi all,
slowly moving forward with my bit bashed serial coms on my 16F84. I now have a MAX232 circuit built up and tested so I can 'see' what the PIC is outputing.

Question: do I need any extra hardware between the PIC and the TTL input of the MAX232? Reason I ask is because I am trying to send a stream of the character 'A' from the PIC to a terminal program on my PC and just get garbage.

I just wanted to check this out before I start pulling my hair out over code!

Thanks heaps,
James Fitzsimons

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2001\11\12@034725 by Vasile Surducan

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On Mon, 12 Nov 2001, James Fitzsimons wrote:

> Question: do I need any extra hardware between the PIC and the TTL input of the MAX232? Reason I ask is because I am trying to send a stream of the character 'A' from the PIC to a terminal program on my PC and just get garbage.
>
 No.

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2001\11\12@044207 by James Fitzsimons

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Hi Vasile,
Thanks for your response.

I have actually just managed to get serial communication working using an
interrupt driven routine. The other code I was using was using polling. I
guess I must have some timing errors in the polling code...

Kind regards,
James Fitzsimons


> > Question: do I need any extra hardware between the PIC and the TTL
input of the MAX232? Reason I ask is because I am trying to send a stream of
the character 'A' from the PIC to a terminal program on my PC and just get
garbage.
> >
>   No.

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2001\11\12@060355 by Vasile Surducan

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Axel has written a polling serial routine for 84. It works great.
Even if is inserted in a jal procedure you can use it only as assembler.
You may find it at:
www.geocities.com/vsurducan/electro/PIC/pic84lcd.htm
Vasile

On Mon, 12 Nov 2001, James Fitzsimons wrote:

{Quote hidden}

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2001\11\12@061010 by D Lloyd

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Hi,

In response to

"Question: do I need any extra hardware between the PIC and the TTL
input of the MAX232? Reason I ask is because I am trying to send a stream
of
the character 'A' from the PIC to a terminal program on my PC and just get
garbage."

The answer is no but if you are getting garbage it might be worth trying a
different PC (from a different manufacturer). A Toshiba laptop I once used
to interface to a PIC (via Max232) didn't seem to like the RS232-C levels
it was presented with. Sometimes it would work.....sometimes it produced
rubbish - it was very marginal.

Regards,
Dan

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2001\11\12@103101 by Jerome LELONG

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 hi,

I've been the same probleme whith my toshiba laptop and wok perfectly whith
my home computer.

Regards

-----Message d'origine-----
De : pic microcontroller discussion list
[@spam@PICLISTKILLspamspamMITVMA.MIT.EDU]De la part de D Lloyd
Envoye : lundi 12 novembre 2001 12:07
A : KILLspamPICLISTKILLspamspamMITVMA.MIT.EDU
Objet : Re: [PIC]: does serial coms require any extra parts?


Hi,

In response to

"Question: do I need any extra hardware between the PIC and the TTL
input of the MAX232? Reason I ask is because I am trying to send a stream
of
the character 'A' from the PIC to a terminal program on my PC and just get
garbage."

The answer is no but if you are getting garbage it might be worth trying a
different PC (from a different manufacturer). A Toshiba laptop I once used
to interface to a PIC (via Max232) didn't seem to like the RS232-C levels
it was presented with. Sometimes it would work.....sometimes it produced
rubbish - it was very marginal.

Regards,
Dan

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