PIC microprocessor programmer
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lowlvl.c
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picprg
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README

Linux PIC programmer			  Copyright 1994-2002 by Brian C. Lane
------------------------------------------------------------------------------

  PIC programmer is a program to use a PIC programmer attached to the
parallel port of a PC running Linux. It currently only supports programming
the 16C84 processors. It can support a wide range of programmer styles
through the configuration menu.

  You should run the program as root, because it needs direct access to the
parallel port to control the programmer. If you are running it from an xterm
you should set TERM=xterm-color so that ncurses will display the colors
correctly.

  Non-color displays should automaticly be detected. If you have problems,
run picprg with the '-m' argument to turn on the monochrome mode.

  The latest release is v2.3 as of 08/23/2002

  Compiling PIC programmer
  ------------------------

  Type 'make' and 'make install' to build the program and install it as suid
root in /usr/local/bin (remember that this may be a potential security hole)
with permissions set to 4700. I am using it under Linux kernel v2.0.33 with
ncurses v1.9.9g hopefully you won't have to do anything extra to get it to
work on your system. If you have problems or need to make changes, please
tell me and I will try to incorporate them into the next release.
 
  v2.3.0 now works with kernel v2.4.18 on a customized RH 7.3 install using
ncurses 5.2-26 from the RedHat package.


  Initial Setup
  -------------

  You should know which parallel port pins your programmer is attached to.
Also, you should have a voltmeter or some other device to indicate power
during the setup test. Run the program with the -p option to tell it which
parallel port your programmer is attached to. For example if your programmer
is attached to /dev/lp1 like mine is then you would run it like this:

  picprg -p1 

  You will see the main screen, press C to get to the configuration menu.
You will see a list of selections with the cursor on the parallel port. Use
the up and down arrows to switch between options.

  PIC programmer is initially setup for a normal David Tait style
programmer, if this is what you are using, jump ahead to the 'Testing It Out'
section. Enter the pin numbers for each connection on your programmer (valid
numbers are from 1-17). If your programmer uses an inverter on that line
then press '-' to select the inverted state.


  Testing It Out
  --------------

  Now, get out your voltmeter, or whatever you are going to use for
detecting power (it should be able to handle at least 13v). Connect GND to
pin 5 on your programming socket. Then select Vpp in the configuration menu
and hit 'O' and 'F' to turn it on and off. You should see pin 4 going from
0v to 13v or so (depends on the programmer). Repeat this for each of the
pins listed below:

  Vpp      - pin 4
  Vdd      - pin 14
  Clock    - pin 12
  Data Out - pin 13

  The state of the Data In pin should be the same state as the Data Out pin.

  Once you have all the voltages swinging the right direction hit 'S' to
save the configuration to ~/.picprgrc, now all you have to type to run it
is picprg. You are all ready to start using PIC programmer!


  File Types
  ----------

  I used to have support for Ian King's pictools format, but since I can't
find Ian on the net anymore, and since it really was a non-standard format
(Microchip defines that the eeprom and config bits have memory locations) I
have dropped support for pictools.

  I do support Intel HEX 16 format, which will be supported by any decent
assembler that you can find (I recommend picasm v1.05+). The fuse and eeprom
locations can be defined in the configuration menu if they are not in the
standard locations.

  v2.0 had a bug in it. It actually only supported INHX8M formatted files.
This was because when I first wrote the program I used code from Ian King,
and he mis-labeled the code (and there was some confusion as to what 8m and
16 really were). The 8M format has the bytes reversed and the address count
doubled (because it works on byte by byte). INHX16 uses the normal byte
ordering (MSB first, just as God intended it to be!) and address counts.

  Through a miracle of modern programming (Hmm, I'm starting to sound like a
Microsoft marketing type) I now support both formats automaticly. Just type
in the filename and the program will figure it out. I recommend using INHX16
though -- it makes more sense and I hate it when you have to end up
supporting bad formats just because everyone else does it (sound familiar?).


  Loading a File
  --------------
  When a file is loaded it is stored in the internal buffer. The clock type
and fuse states are displayed on the second line of the display while the
file is in memory. The clock type and fuse states are determined by looking
for the addresses defined in the configuration menu.


  Writing a File
  --------------
  This will write a Intel HEX 16 format file with the eeprom and fuse data
in the locations defined in the configuration menu.


  Reading a PIC
  -------------
  Make sure the programmer is connected correctly and that the processor is
plugged in correctly. Hit the 'R' key from the main menu and the data from
the processor will be read into the internal buffer and its clock type and
fuse states will be displayed on the second line of the display. As it is
reading it will display every 16th address, just to let you know it is
working diligently at its task.


  Programming a PIC
  -----------------
  Make sure the programmer is connected correctly and that the processor is
plugged in correctly and hit P. The data in RAM will be written to the PIC
and the 3rd line will display 'Programming PIC.' If any errors are found,
they will be displayed showing the address, the value read, and the value
expected in the form: ADDR: read != written. It will also display every 16th
address as it programs, telling you that its is still working and hasn't
taken one of Linus' famous beer breaks.


  Displaying RAM
  --------------
  You can review the loaded RAM image by hitting 'D' from the main menu and
using the Arrow keys, page up and down, and space(page down) keys. Editing
is not available, I did not think that it was worth the effort of adding it.


  ID and FUSE data
  ----------------
  When reading a INHX16 file the ID and fuse data are taken from the memory
locations specified in the configuration menu. Microchip defines that this
be 0x2000, but some people have other ideas.

  v2.0 had a slight bug in it <G>. It wouldn't build the fuse data correctly
in most circumstances (of course it worked fine for me when I originally
tested it!), this was another holdover from pictools support where it would
remove the fuse data from the memory map, set a bunch of flags, and then
when writing or saving it would re-construct the byte. Well, all that has
been removed. The fuse data stays in the memory map, and is not altered in
any way by the program.


  EEPROM data
  -----------
  EEPROM data is programmed into the pic from the RAM location specified by
the EEaddr in the configuration menu. This value defaults to 0x2100.


  Command line parameters
  -----------------------
  Type picprg-? to get a list of options. It looks like this:

  Usage: picprg -p[0-2] -i[hex] -e[hex] <filename>

  -p[0-2]  =  Parallel port to use
  -i[hex]  =  HEX value of ID data address in memory map.
  -e[hex]  =  HEX value of EEPROM data address in memory map.

  I am planning on adding command line operation soon so that you can read
and program the PIC from the command line. If you have any suggestions or
comments, please email me at bcl@brianlane.com -- Check out my webpage for the
latest info (including the current temperature in my workroom and computer).

  Even if you don't have any comments I'd like to hear from people using the
program, just so that I know someone other than me is using it <G>.

  Brian

  bcl@brianlane.com
  http://www.brianlane.com/

  Thanks!
  -------

  I'd like to thank xxx for being the first person to tell me he was using
the program, and for reporting a bunch of really dumb bugs. I'd also like to
thank Paul Haas for providing the patch that makes it work with open
collector programmers.


  Disclaimer
  ----------

  This program was written by a human. Because of this its reliability
cannot be guaranteed in any way. It may or may not work for you, it may work
for a while, then quit, or it may work forever. You cannot hold me liable
for any lost work, time, etc. as a result of bugs in this program. Like all
other software, you use it at your own risk.

  It is released under GPL v2.0 which essentially means you can do what you 
will with it, as long as you give credit and include the source in any 
downstream derivitive.

This program is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the Free
Software Foundation; either version 2 of the License, or (at your option)
any later version.

This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
more details.

You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
59 Temple Place - Suite 330, Boston, MA  02111-1307, USA