gnupic: Programming the 16f870
Subject:
Re: Programming the 16f870
From:
####@####.#### (Byron A Jeff)
Date:
29 Dec 2001 16:21:19 -0000
Message-Id: <200112291619.fBTGJG513417@cleon.cc.gatech.edu>
>
> On Fri, Dec 21, 2001 at 09:27:30AM -0500, Byron A Jeff wrote:
> > >
> > > Hello,
> > >
> > > I am trying to program a 16f870 with a home-built parallel port programmer,
> > > similar to the trivial lvp programmer from http://www.gnupic.org. The hardware
> > > works fine, I can read data with it (and recognise the chip identification).
> >
> > Cool. Glad that it works.
>
> It doesn't anymore, since I moved the hardware to a different computer
> (where it isn't in the way) :-( All the voltages seem allright though. I'm
> using a high voltage programmer. Does anyone know usual problems with
> programmers?
>
> > > I am using a simple program I wrote in C that sends 3 bits on the parallel
> > > port
> > > (mclr, data and clock) and reads the data. I use a bash script to do the
> > > programming.
> >
> > Interesting. I do have a question though: are you writing this code as a
> > learning exercise? If so then more power to you. However if the objective is
> > to get a programmer working, then I would advise pulling a copy of picprg2.3b
> > from my page and use it. It works quite well and will save you the hassle of
> > regenerating new code.
>
> Both, actually. And I think I need to, since my hardware is like this
> trivial LVP programmer, but not equal.
>
> > > The source of the picwrite program is there too. It is suid root so it can
> > > write to the port (which is really dirty, but I don't know how to use the
> > > parport drivers and didn't feel like learning it since it's just for myself
> > > anyway).
>
> On Fri, Dec 21, 2001 at 01:20:40PM +0100, Ralf Forsberg wrote:
> > It's easy to use ppdev. Here's an example with no error checking:
>
> I tried. It is really easy indeed. Thanks.
>
> > Probably isn't worth the hassle not to make it SUID root. picprg2.3b needs to
> > be SUID root in order for ordinary users to user it.
>
> That is a reason for me not to use it. I don't want any code which is not
> written by myself and replacable to be suid root.
>
> Bye,
> Bas Wijnen
>
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