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PICList Thread
'help:Emulator versus circuit board'
1997\02\24@064524 by pxico

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Hello,

I'm working on a project that i use a PIC to decode magnetic card's. My
question is when i use an emulator on circuit board the PIC works OK,
but when i program a PIC and put the PIC on the board we dont't work.
Why, is my question. Please help me.

Best Regards
Paulo Figueiredo

-----------------------------+-----------------------------------
Paulo Figueiredo             |  Idite-Minho
email: spam_OUTpxicoTakeThisOuTspamidite-minho.pt  |  Centro de Automagco e Electrsnica
tel: +351-53-619470          |  Av. Dr. Francisco Pires Gongalves
fax: +351-53-612957          |  4700 - Braga (Portugal)
_________________________________________________________________

1997\02\24@084118 by eroen Ommering

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Hi Paulo,

At 11:44 24/02/97 +0100, you wrote:
>Hello,
>
>I'm working on a project that i use a PIC to decode magnetic card's. My
>question is when i use an emulator on circuit board the PIC works OK,
>but when i program a PIC and put the PIC on the board we dont't work.
>Why, is my question. Please help me.
>
>Best Regards
>Paulo Figueiredo

I'm afraid nobody can answer your question if you are not a bit more
precise. But let me share an experience I had, perhaps it gives you a clue.

When I was working on a project with a 'C64 on a PC add-on card, I used the
Parallel data bus feature of the 'C64 to communicate with the PC via the ISA
bus. Everything worked very well with my emulator (Parallax ClearView).
However, the customer complained that 'sometimes', a certain command from
the PC to the PIC was ignored. After a long time of desperate search, I
discovered that the interrupt flag of the parallel port was inadvertently
cleared by any 'return' instruction! (two weeks after that, Microchip added
the errata sheets to their web page, sigh..)

The bound-out PIC used in my emulator had that bug fixed .....

Perhaps you're encountering the same kind of problem. So check the errata
sheet of the PIC you're using and check whether there are differences
between the emulator PIC (a special version of the chip with more
connections) and the 'real' one you're using

Good luck, I know how you're feeling

Jeroen
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1997\02\24@094325 by Craig Knotts

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    Paulo,

    You didn't give a lot of detail, but I take a stab at it anyway...

    What sort of oscillator are using on the circuit board.  If you are
    using an RC oscillator, you may have timing problems, as the emulator
    uses a crystal oscillator.

    Did you enable the watchdog, and if so, are you updating the watchdog
    in your software.  The emulator probably does not have the watchdog
    feature enabled, so you would miss the problem in the emulator.

    Is your power supply to the PIC chip correct?  Can you verify that the
    oscillator is running?  Is your MCLR line high?

    Good Luck,
    Craig


______________________________ Reply Separator _________________________________
Subject: help:Emulator versus circuit board
Author:  Paulo Figueiredo <pxicospamKILLspamIDITE-MINHO.PT> at Internet
Date:    2/24/97 11:44 AM


Hello,

I'm working on a project that i use a PIC to decode magnetic card's. My
question is when i use an emulator on circuit board the PIC works OK,
but when i program a PIC and put the PIC on the board we dont't work.
Why, is my question. Please help me.

Best Regards
Paulo Figueiredo

-----------------------------+-----------------------------------
Paulo Figueiredo             |  Idite-Minho
email: .....pxicoKILLspamspam.....idite-minho.pt  |  Centro de Automagco e Electrsnica
tel: +351-53-619470          |  Av. Dr. Francisco Pires Gongalves
fax: +351-53-612957          |  4700 - Braga (Portugal)
_________________________________________________________________

1997\02\25@023252 by Peter Grey

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At 02:29 PM 24/02/97 +0100, you wrote:
{Quote hidden}

I have had similar problems and it is important to recognise the differences
between the two. In the case of the emulator I use(Advanced Transdata), it
does not look at either the external frequency ot the reset line. So I would
first check and ensure that the oscillator is woking and secondly that the
MCLR line is not being forced low at any time or has noise on it. I found
this to be the problem most of the time when I had this sort of problem.
Other problems may arise because of timing or some other exotic sources.

Best of luck,

1997\02\26@181156 by pxico
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Thanks for everybody who help me to resolve my problem.
Another question. Why i receive a message that my message are be send?

Best Reagrds for all
Paulo Figueiredo
-----------------------------+-----------------------------------
Paulo Figueiredo             |  Idite-Minho
email: pxicospamspam_OUTidite-minho.pt  |  Centro de Automagco e Electrsnica
tel: +351-53-619470          |  Av. Dr. Francisco Pires Gongalves
fax: +351-53-612957          |  4700 - Braga (Portugal)
_________________________________________________________________

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