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'pic programmer circuit'
2003\03\12@102250 by TONY PADGETT

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I have been attempting to use the el cheapo programmer on a 16f627 with no success at all.  Does anyne have a circuit for reliable programming and a straight forward program for it.    
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2003\03\12@105100 by Rick Regan

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>I have been attempting to use the el cheapo
>programmer on a 16f627 with
>no success at all.  Does anyne have a circuit for
>reliable programming
>and a straight forward program for it.

Which version of the El Cheapo circuit are you using -
the "book" version or the "homebuilt" version?
Which software version are you using - Windows 0.84?
Have you gotten it to work for any other chips
(e.g. 16F84)?

I can program a 16F84, 16F84A, and 16F627 (only chips
I've tried with it) successfully on the "homebuilt"
circuit using the Windows 0.84 software.


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2003\03\12@105722 by Wouter van Ooijen

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> I have been attempting to use the el cheapo programmer on a
> 16f627 with no success at all.  Does anyne have a circuit for
> reliable programming and a straight forward program for it.

http://www.voti.nl/wisp628 but you will need a programmed 16f628. but if
you can get your cheapo to work just once....

Wouter van Ooijen

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2003\03\12@110342 by Clayton Mellina

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I am in the process of building an El Cheapo programmer as well.  The
PIC16F62x devices need to have RB4 pulled low to initialize the programming
mode.  The solution is simply a matter of connecting RB4 to ground when
programming 16F62x's.  I use IC-PROG for software.

Good luck.

-Clayton

{Original Message removed}

2003\03\12@110755 by TONY PADGETT
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It is the only pic I have.  First time using the HOMEBUILT circuit.  I have version 0.81


>I have been attempting to use the el cheapo
>programmer on a 16f627 with
>no success at all.  Does anyne have a circuit for
>reliable programming
>and a straight forward program for it.

Which version of the El Cheapo circuit are you using -
the "book" version or the "homebuilt" version?
Which software version are you using - Windows 0.84?
Have you gotten it to work for any other chips
(e.g. 16F84)?

I can program a 16F84, 16F84A, and 16F627 (only chips
I've tried with it) successfully on the "homebuilt"
circuit using the Windows 0.84 software.


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2003\03\12@111342 by Clayton Mellina

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This is for the book version.
Is RB4 grounded in your programmer?

-Clayton

-----Original Message-----
From: pic microcontroller discussion list
[PICLISTspamspam_OUTMITVMA.MIT.EDU]On Behalf Of Clayton Mellina
Sent: Wednesday, March 12, 2003 10:03 AM
To: @spam@PICLISTKILLspamspamMITVMA.MIT.EDU
Subject: Re: pic programmer circuit


I am in the process of building an El Cheapo programmer as well.  The
PIC16F62x devices need to have RB4 pulled low to initialize the programming
mode.  The solution is simply a matter of connecting RB4 to ground when
programming 16F62x's.  I use IC-PROG for software.

Good luck.

-Clayton

-----Original Message-----
From: pic microcontroller discussion list
[KILLspamPICLISTKILLspamspamMITVMA.MIT.EDU]On Behalf Of TONY PADGETT
Sent: Wednesday, March 12, 2003 9:19 AM
To: RemoveMEPICLISTTakeThisOuTspamMITVMA.MIT.EDU
Subject: pic programmer circuit


I have been attempting to use the el cheapo programmer on a 16f627 with no
success at all.  Does anyne have a circuit for reliable programming and a
straight forward program for it.



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2003\03\12@132353 by Rick Regan

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>I am in the process of building an El Cheapo
>programmer as well.  The PIC16F62x devices need to
>have RB4 pulled low to initialize the programming
>mode.  The solution is simply a matter of connecting
>RB4 to ground when programming 16F62x's.  I use
IC->PROG for software.

The El Cheapo circuits (book or homebuilt) don't
ground RB4, and I didn't modify mine to do so.
I guess I am just lucky that it is able to
program the 16F627 without problems.

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2003\03\12@141114 by Clayton Mellina

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Now that I look at the programming specs a little closer, I think that you
only have to hold RB4 low if LVP is enabled and you are trying to program
with HVP.  Holding RB4 low stops the chip from inadvertently going into LVP
mode.  LVP is enabled when the chip is shipped so you want to hold RB4 low
the first time especially.  Maybe you were lucky and the chip did not
"think" about going into LVP mode.  I'm not quite sure about this.

-Clayton

{Original Message removed}

2003\03\12@150724 by Randy Jones

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I discussed this at length with Microchip tech support last summer...

After reading the info in the datasheet, the errata on this issue, and also
their replies to my questions, I decided that keeping RB4 low every time I
program a 16F62x would be a good thing to do.  If LVP is already disabled,
and you don't erase before programming, it supposedly isn't necessary to
hold RB4 low, but I came away with the impression that there may be some
"issues" and keeping RB4 low every time would be wise.  Some would call it a
"belt and suspenders" approach, but I haven't had any problems with it since
then...

Randy


----- Original Message -----
From: "Clayton Mellina" <EraseMEcmellinaspamFLASH.NET>
To: <RemoveMEPICLISTEraseMEspamEraseMEMITVMA.MIT.EDU>
Sent: Wednesday, March 12, 2003 11:10 AM
Subject: Re: pic programmer circuit


> Now that I look at the programming specs a little closer, I think that you
> only have to hold RB4 low if LVP is enabled and you are trying to program
> with HVP.  Holding RB4 low stops the chip from inadvertently going into
LVP
> mode.  LVP is enabled when the chip is shipped so you want to hold RB4 low
> the first time especially.  Maybe you were lucky and the chip did not
> "think" about going into LVP mode.  I'm not quite sure about this.
>
> -Clayton
>
> {Original Message removed}

2003\03\12@155135 by Byron A Jeff

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On Wed, Mar 12, 2003 at 10:19:17AM -0500, TONY PADGETT wrote:
> I have been attempting to use the el cheapo programmer on a 16f627 with no
> success at all.  Does anyne have a circuit for reliable programming and a
> straight forward program for it.

Many have had success with my TLVP programmer:

http://www.finitesite.com/d3jsys

And for truth in advertising, some have had problems. Be sure to read the
messages in the forum for common issues.

BAJ

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2003\03\12@203640 by Gavin Jacobs

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Wouter,
I like the design of the wisp628 because it puts the timing close to the target chip, and provides an easy-to-use serial interface
for the PC. But, I'm not excited about having to load Python etc. to get the software working on Windows XP Pro. Have you ever
thought of collaborating with the folks at IC-Prog to take advantage of the great UI that they have?

Gavin



{Original Message removed}

2003\03\12@213900 by Kyrre Aalerud

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I made my own programmer for LVP and LVICSP and simply made sure it was
compatible with the Schaer programmer in IC-prog :-)  This turned out to be
a great solution and it always works.

I may post some schematics and layouts later.  (Need some polishing hehe.)
I've tested it with 16F628 and 16F627 with no problems.

There doesn't seem to be much to gain from using LVP??? You loose a port or
more no matter what :-(

   KreAture

{Original Message removed}

2003\03\13@135802 by Wouter van Ooijen

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> I like the design of the wisp628 because it puts the timing
> close to the target chip, and provides an easy-to-use serial interface
> for the PC. But, I'm not excited about having to load Python
> etc. to get the software working on Windows XP Pro. Have you ever
> thought of collaborating with the folks at IC-Prog to take
> advantage of the great UI that they have?

There are at least two alternative user interfaces:
home.hccnet.nl/d.a.kuipers/pic/bumblebee/introduction.html
http://www.robh.nl/PICSOFT.HTM#XWisp2
and IIRC at least one of the Jal IDE's (Jalcc?) has build-in wisp628
support.

I contact Bonny Gijzen (IC-prog) some time ago, but he (she?) was not
interested in interfacing at a 'message' level. IC-prog is based on
controlling the line s to the target chip directly, so it would require
a major redesign.

Wouter van Ooijen

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2003\03\13@172657 by Larry Bradley

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I just downloaded and tried Bumblebee with Wisp628 - not too impressed. It
does not support 115200 baud as XWISP/Wisp628 do, thus it is much slower.
It does not appear to have a CHECK function to verify that loading was
correct. It has a couple of nice features - you can load (and read) just
code, just data, just fuses; when you read from the chip, it gives you a
hex display of what it read.

It's terminology is not what I expected - the author used "download" and
"upload" - it was not obvious to me which way "download" was - I assumed
(incorrectly!) that it meant "download my hex file to the target chip".
Nope - that's "upload".

Biggest problem I see with any such program is keeping it up to date with
what Wouter is doing.

Installing Python was a no brainer - I too was leery of "Oh my God -
another package to install!", but it installs easily and runs well.

I could not get CodeDesigner Lite (as supplies with Picbasic Pro) to use
XWISP to program a chip, but upon switching to Microcode Studio, it was
easy to tell it to use XWISP.

Go for it - you will be quite pleased with XWISP/Wisp628 - if only Wouter
would stop writing code and produce come documentation (hint, hint!).
Wouter is quick to respond to problems - he fixed two for me very quickly.

Larry


At 07:57 PM 3/13/2003 +0100, you wrote:
{Quote hidden}

Larry Bradley
Orleans (Ottawa), Ontario, CANADA

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2003\03\14@151327 by Wouter van Ooijen

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> It does not appear to have a CHECK function to verify that loading was

It might not be apparent but the xwisp 'go' command also reads the chip
and compares

>  It has a couple of nice features - you can load (and
> read) just code, just data, just fuses;

in xwisp: select command ('select -a+f' for just fuses)

> when you read from the chip, it
> gives you a hex display of what it read.

xwips can 'dump', but only as hex.

> only Wouter
> would stop writing code and produce come documentation (hint, hint!).

But Microchip keeps turning out new chips with new programming
algorithms!

Wouter van Ooijen

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