gnupic@linuxhacker.org

Jeff

I found in the past , programming the 877A is not easy with our kind of
small programmers.

Why dont you try PIC16F877 instead? It is basically the same...

Then you can use a lot of programmers out there. I am still unable to
get it working on Linux, but in m$oft the FPP software works pretty
descent with the TLVP (Trivial Low Voltage Programmer)

Also, as you want to disable low voltage, you can put a transistor in
On/Off mode, to get High Voltage (+3.5 of Vcc for real) in the Vpp pin.

Regards!

Gustavo


On Mon, 2003-03-17 at 18:16, Jeff Jackowski wrote:
> I want to use a PIC16F877A in my next project, but I'm having trouble 
> getting a program onto the PIC. First of all, I want to disable low 
> voltage programming. Secondly, I have tried a number of the simple to 
> build programmers in the past, and they worked, but soon failed 
> mysteriously and I was never able to get the same design, even with 
> different parts, to work again.
> 
> I have a Warp-13a programmer. I got it long enough ago that its firmware 
> does not support the 16F87xA. I also haven't seen any Linux support for 
> using the Warp-13a to put code onto a 16F87xA, so upgrading firmware won't 
> help.
> 
> In light of all this, I decided to make my own programmer using a PIC that
> I could program. I made a prototype with a 16F84 (it's in C, so other
> parts should be easily used). It can read data from other PICs. Over the
> past few days I have tried to make it write data, too, but it still
> doesn't work and I don't know how to fix it. The problem seems to be in my
> impementation of the communication between the programmer and the target
> -- the part that Microchip documents.  Ironically, they don't document
> reading as well, but that's what I got to work.
> 
> Can gpism emulate a PIC being reprogrammed by another PIC? I'd look on the 
> site, but I can't get a whole page from dattalo.com right now.
> 
> Any help is greatly appreciated. I put the code I have at
> http://ro.com/~jeffj/projects/loader.tar.bz2 for anyone who actually wants
> to look.  All GPL'd stuff. I think the problem is in PIC14.c.
-- 
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Gustavo A. Lozano                                 Noldata Corporation
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