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'[PIC] Cheap programmer supporting USB-able PICs'
2005\09\09@001347 by Christopher Head

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Greetings all,
My sincere apologies to anybody bothered by the first sending of this
message without a list marking.

I'm currently planning a project that will use a PIC to talk to a
computer via USB. According to the Microchip chart, the appropriate
units are the 18F2455, 18F2550, 18F4455, and 18F4550. I've built Myke
Predko's El Cheapo programmer; however, his page (myke.com) indicates a
very limited number of PICs supported by his software. It seems lots of
people here like Wouter's Wisp628. It doesn't seem too hard to build,
but his site seems to say that while it supports a lot of PICs, it
doesn't support any of these four PICs I mentioned above. Is this true?
If so, would (politely) bugging him make it support them in the near
future with little or no hardware modification to the circuit?

Also, my only programmer at this point is the aforementioned El Cheapo.
Myke's page indicates that it supports the 16F628, and Wouter's page
indicates that the Wisp is powered by a 628. However, Microchip's page
no longer indicates the existence of the 628; apparently, it has been
replaced with the 16F628A. Will the El Cheapo program 16F628As, and will
a 16F628A work in the Wisp? How about other similar chips (I have a few
free samples from Microchip which are IIRC 16F648As or 16F684s).

What would everyone suggest?

Thanks for your help,
Chris
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2005\09\09@013512 by Chen Xiao Fan

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I would say that Xwisp2 from Rob Hamerling is the best software
for Wisp628. His homepage is at http://www.robh.nl/. Version
1.7 (soon to be released) will add support for Linux as well.
According to the xwisp2.cfg file, it will supports the 18F USB parts.

For bootstrapping the Wisp628, You can buy the programmed
16F628A from Wouter or ask some people near you for help.
Wisp628 support both 16F628 and 16F628A. I think you may
even want to use 16F648A since Wouter's next version will
be using 16F648A. There is another advantage to use
16F648A, you can then use EasyISP to emulate Olin's EasyProg
as well. EasyISp is from Philip Pemberton and the URL
is http://www.philpem.me.uk/.

I think any JDM programmer should be able to do the bootstrapping
as well. Maybe you want to check Winpic800 from
http://perso.wanadoo.es/siscobf/winpic800.htm (Spanish)
http://forum.microchip.com/tm.asp?m=108574 (Microchip Forum)

I have not tried it but the chip support is really impressive
and it claims to support even dsPICs.


Regards,
Xiaofan

{Original Message removed}

2005\09\09@023200 by Wouter van Ooijen

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> -----Original Message-----
> From: spam_OUTpiclist-bouncesTakeThisOuTspammit.edu
> [.....piclist-bouncesKILLspamspam@spam@mit.edu] On Behalf Of Christopher Head
> Sent: Friday, September 09, 2005 5:14 AM
> To: piclistspamKILLspammit.edu
> people here like Wouter's Wisp628. It doesn't seem too hard to build,
> but his site seems to say that while it supports a lot of PICs, it
> doesn't support any of these four PICs I mentioned above. Is
> this true?

yes, for the time beeing.

> If so, would (politely) bugging him make it support them in the near
> future with little or no hardware modification to the circuit?

I have done some work on it, but the next few weeks are claimed by even more urgent work. It is a SW/firmware change, but it will require a 16F648A chip in the progger.

> Myke's page indicates that it supports the 16F628, and Wouter's page
> indicates that the Wisp is powered by a 628. However, Microchip's page
> no longer indicates the existence of the 628; apparently, it has been
> replaced with the 16F628A. Will the El Cheapo program
> 16F628As, and will
> a 16F628A work in the Wisp? How about other similar chips (I
> have a few
> free samples from Microchip which are IIRC 16F648As or 16F684s).

AFAIK the 16F628 is still available, athough not advised for new designs. The Wisp628 will work with a 16F628A or 16F648A, that is what I currently use. A programmer that mentions support for the 628 but not for the 628A is not likely to work with the A, because it uses a different programming protocol.

Wouter van Ooijen

-- -------------------------------------------
Van Ooijen Technische Informatica: http://www.voti.nl
consultancy, development, PICmicro products
docent Hogeschool van Utrecht: http://www.voti.nl/hvu



2005\09\09@081302 by olin piclist

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Christopher Head wrote:
> I'm currently planning a project that will use a PIC to talk to a
> computer via USB. According to the Microchip chart, the appropriate
> units are the 18F2455, 18F2550, 18F4455, and 18F4550. I've built Myke
> Predko's El Cheapo programmer; however, his page (myke.com) indicates a
> very limited number of PICs supported by his software. It seems lots of
> people here like Wouter's Wisp628. It doesn't seem too hard to build,
> but his site seems to say that while it supports a lot of PICs, it
> doesn't support any of these four PICs I mentioned above.

My EasyProg does support all those chips, and I like to think it's not that
hard to build nor expensive to buy either.  You can cobble one up completely
on your own from the schematic, buy a bare board and scrounge the parts, buy
a kit, or buy a fully assembled and tested unit.  The chips you mention are
supported directly in the ZIF socket, and the EasyProg also has some
in-circuit programming capability.  Details are at
http://www.embedinc.com/products.


*****************************************************************
Embed Inc, embedded system specialists in Littleton Massachusetts
(978) 742-9014, http://www.embedinc.com

2005\09\09@151438 by Maarten Hofman

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>
> Also, my only programmer at this point is the aforementioned El Cheapo.
> Myke's page indicates that it supports the 16F628, and Wouter's page
> indicates that the Wisp is powered by a 628. However, Microchip's page
> no longer indicates the existence of the 628; apparently, it has been
> replaced with the 16F628A. Will the El Cheapo program 16F628As, and will
> a 16F628A work in the Wisp? How about other similar chips (I have a few
> free samples from Microchip which are IIRC 16F648As or 16F684s).

The El Cheapo can be made to program many more chips than Myke's webpage suggests by using the ic-prog software instead of the El Cheapo software. ic-prog has undocumented support for El Cheapo. Even though this increases the range of PICs drastically, the 16F628A can NOT be programmed. I have tried doing this for quite some time, and it doesn't work. I had problems with the 16F688 as well, but this is partly because ic-prog doesn't seem to support that PIC. I did, however, succeed in programming a 16F88 using the El Cheapo. Note that http://www.glitchbuster.com still sells 16F628 for a low price.
Greetings,
Maarten Hofman.

2005\09\10@073134 by Rob Hamerling

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Chen Xiao Fan wrote:
> I would say that Xwisp2 from Rob Hamerling is the best software
> for Wisp628. His homepage is at http://www.robh.nl/. Version
> 1.7 (soon to be released) will add support for Linux as well.

Today I have released XWisp2 version 1.7.00.
Major enhancement: runs now also under Linux besides OS/2 eComStation
and Windows.

See my site, esp. http://www.robh.nl/picsoft.html#xwisp2

Regards, Rob.


--
Rob Hamerling, Vianen, NL phone +31-347-322822
homepage: http://www.robh.nl/

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