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'[PIC]:ICP'
2001\01\10@133141 by David VanHorn

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Snaggles again.

I'm working on an F876 proto, and having problems programmig it in circuit.
I was using the Picstart, but it seems that under some (not understood)
circumstances, a new code set can cause subsequent failure of the
programming process.

So, what I need to know, is a reliable, practical, and inexpensive way to
reprogram these devices in circuit.

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2001\01\11@122842 by Roman Black

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David VanHorn wrote:
>
> Snaggles again.
>
> I'm working on an F876 proto, and having problems programmig it in circuit.
> I was using the Picstart, but it seems that under some (not understood)
> circumstances, a new code set can cause subsequent failure of the
> programming process.
>
> So, what I need to know, is a reliable, practical, and inexpensive way to
> reprogram these devices in circuit.


I use Picstart Plus, with a small four wire header,
(power is supplied to the target board externally)
and have *never ever* had a glitch with any F series
part, which is is all we program incidentally.

All units are programmed in circuit and from MPLAB,
and using Microchip's own MPLAB and Picstart interface
has some convenience to it! :o)
-Roman

PS. The only bad bit is having to program the entire
memory, gets slow with F877. About 4 minutes if I
remember.

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2001\01\11@125543 by M. Adam Davis

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You can tell mplab that you only want to program from location x to
location y.  It goes much faster if you only program from 0x000 to 0x180
instead of all 8K.

-Adam

Roman Black wrote:
{Quote hidden}

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2001\01\11@132456 by Roman Black

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M. Adam Davis wrote:
>
> You can tell mplab that you only want to program from location x to
> location y.  It goes much faster if you only program from 0x000 to 0x180
> instead of all 8K.
>
> -Adam

What?? Please tell me how, this is with Pictsart
remember, not the "professional" programmers...
????
-Roman

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2001\01\11@134611 by M. Adam Davis

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I can tell you, but I'll have to charge a consulting fee...  ;-)

j/k.
I don't have the program on this computer, so this is from memory...
Once you have enabled the picstart+, go back to the picstart menu (or
programmer menu), and select the program option.  The program window pops
up (you know the one which has the memory range in it and pops up when you
press program?), it won't start programming, it just brings up the window
that operates when the programming occurs.  You can now change the
beginning and ending addresses.

When I compile I bring up the code window (shows the program code in a
hexidecimal format) and find where my program ends.  I then have it
program the next row after the end of my program, and so far it takes me
about 30 seconds to program my usual 500 bytes.  Longer than what I'd
like, but good enough.  short enough that I don't feel like getting up and
tidying the basement while its programming...;-)

-Adam

Roman Black wrote:
{Quote hidden}

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2001\01\11@140656 by David VanHorn

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>
>
>I use Picstart Plus, with a small four wire header,
>(power is supplied to the target board externally)
>and have *never ever* had a glitch with any F series
>part, which is is all we program incidentally.

Hmm..
This is exactly what I'm doing, and I'm having trouble where the part won't
program, and reads back all zeroes, then later it works.
Nothing intermittent in the cable, It's only about 6" long, so I can't
imagine that it's electrically significant.

When it works, it works fine. Then "click", it dosen't work.

I've been told that the Picstart is marginal for ICP.


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2001\01\11@141246 by t F. Touchton

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part 1 2141 bytes content-type:text/plain; charset=us-asciiI'm not real gifted here, but I'll throw my 2 cents into the ring.  I've run
into problems with ICP before associated with the charging of the filter caps on
the PCB messing up the timing.  Solved this by designing an interface that could
rapidly charge the caps.  Also... I had a myriad of problems with Win2000...


|--------+----------------------->
|        |          David VanHorn|
|        |          <dvanhorn@CED|
|        |          AR.NET>      |
|        |                       |
|        |          01/11/01     |
|        |          02:03 PM     |
|        |          Please       |
|        |          respond to   |
|        |          pic          |
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 |       cc:     (bcc: Scott Touchton/US/UNIPHASE)                            |
 |       Subject:     Re: [PIC]:ICP                                           |
 >----------------------------------------------------------------------------|





>
>
>I use Picstart Plus, with a small four wire header,
>(power is supplied to the target board externally)
>and have *never ever* had a glitch with any F series
>part, which is is all we program incidentally.

Hmm..
This is exactly what I'm doing, and I'm having trouble where the part won't
program, and reads back all zeroes, then later it works.
Nothing intermittent in the cable, It's only about 6" long, so I can't
imagine that it's electrically significant.

When it works, it works fine. Then "click", it dosen't work.

I've been told that the Picstart is marginal for ICP.


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part 2 2746 bytes content-type:application/octet-stream; (decode)

part 3 105 bytes
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2001\01\11@142741 by David VanHorn

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At 02:08 PM 1/11/01 -0500, you wrote:
>I'm not real gifted here, but I'll throw my 2 cents into the ring.  I've run
>into problems with ICP before associated with the charging of the filter
>caps on
>the PCB messing up the timing.  Solved this by designing an interface that
>could
>rapidly charge the caps.  Also... I had a myriad of problems with Win2000...

I don't think that's my problem, I'd expect it to behave a lot more
randomly than it is, or not work at all.  Is there a published spec that I
can check against?


Thanks though. :)

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2001\01\11@143155 by t F. Touchton

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part 1 1895 bytes content-type:text/plain; charset=us-asciiI did bump into a spec somewhere in a Microchip Appnote... don't recall exactly
which one, but a quick search should find it.


|--------+----------------------->
|        |          David VanHorn|
|        |          <dvanhorn@CED|
|        |          AR.NET>      |
|        |                       |
|        |          01/11/01     |
|        |          02:24 PM     |
|        |          Please       |
|        |          respond to   |
|        |          pic          |
|        |          microcontroll|
|        |          er discussion|
|        |          list         |
|        |                       |
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 |       To:     PICLISTEraseMEspam.....MITVMA.MIT.EDU                                       |
 |       cc:     (bcc: Scott Touchton/US/UNIPHASE)                            |
 |       Subject:     Re: [PIC]:ICP                                           |
 >----------------------------------------------------------------------------|





At 02:08 PM 1/11/01 -0500, you wrote:
>I'm not real gifted here, but I'll throw my 2 cents into the ring.  I've run
>into problems with ICP before associated with the charging of the filter
>caps on
>the PCB messing up the timing.  Solved this by designing an interface that
>could
>rapidly charge the caps.  Also... I had a myriad of problems with Win2000...

I don't think that's my problem, I'd expect it to behave a lot more
randomly than it is, or not work at all.  Is there a published spec that I
can check against?


Thanks though. :)

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part 2 2683 bytes content-type:application/octet-stream; (decode)

part 3 105 bytes
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