gnupic: Programming the 16f870
Subject:
Re: Programming the 16f870
From:
Bas Wijnen ####@####.####
Date:
29 Dec 2001 03:59:48 -0000
Message-Id: <20011229035346.GB20214@client107-126.kabela.oprit.rug.nl>
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
