readme

at51系列单片机编程源码

README
======

In-System-Programmer for ATMEL's AT89S8252 microprocessor
                        ISP-AT89

                written (c) 2003/2004 by
    Matthias Grimm, Andreas Ochmann and Sascha Flohr.

This is a long name for a short and handy tool. Everybody
who likes it to built electronic circuits by her/his own and
is going to extend his/her activities to microprocessors,
the AT89S8252 from ATMEL is a nice device to start with.

It is easy to handle and fully 8051 compatible so that a
lot of already available resources could be used. Only some
parts are necessary to get a fully working development
environment.

But also this microprocessor needs software to run. Fortunately
the microprocessor has flash memory on board, so it could
easily be erased and rewritten only by software. All we need is
a programming interface and a piece of software to write our
programs to the flash memory.

At this point isp-at89 come on stage. The ATMEL microprocessor
could be programmed through a SPI interface which could be
emulated by an Linux machine with a parallel port. You could
easily build up your own cable you need to connect the processor
to the parallel port. We tell you later what you need for this.


REQUIREMENTS
============
To use this program, you need some additional parts:
1. A microprocessor board containing an ATMEL AT89S8252
2. A cable from parallel port to the microprocessor board
   for programming. See below for construction instructions.
3. A kernel that supports parport devices
   (type 'modprobe parport' if compiled as module)
4. Existing devices /dev/parport0, /dev/parport1, ...
   Only one of them is needed corresponding to the used
   parallel port. /dev/parpor0 is default.

5. To write programs for the ATMEL we recommend the programming
   language C. With SDCC a C-compiler for small devices as
   the 8051 is available. The compiler is available at
   sourceforge.net


INSTALL
=======
The program could be compiled and installed with the known
triple
          configure
          make
          make install

If you got the source from the CVS repository some additional
steps are necessary. You also need the GNU autotools installed
to generate some files needed.

Instructions to make the software:

1. change to CVS directory
2. ./autogen.sh (./configure is executed by this script)
3. make

You can find the program binary in src/isp-at89.

PROGRAMMING INTERFACE
=====================
The SPI interface is an synchronous serial interface with three
lines: SCK    clock
       MISO   serial data out
       MOSI   serial data in

To tell the microprocessor that it should write the data received
from the SPI interface to its program memory we need a RESET
signal. A ground (GND) line com the completes the programming interface.

This five lines must be connected to the parallel port as follows:

       ATMEL           PROG PORT         PARPORT
	 (9) RESET ------- (1) RESET -------  (6) D4
	 (6) MOSI  ------- (2) MOSI  -------  (7) D5
	 (7) MISO  ------- (3) MISO  ------- (10) ACK
	 (8) SCK   ------- (4) SCK   -------  (8) D6
	(20) GND   ------- (5) GND   ------- (25) GND

After finishing the cable it should be tested. If you call isp-at89
with the option '-t' (test) each signal on the parallel port could
be toggled and checked with a multimeter. If necessary specify the
parallel device that should be used (if /dev/parport0 is already
occupied for eg. by a printer)


LEGAL NOTICE
============
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; see the file COPYING.  If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.


CREDITS
=======
This program wouldn't exist if not some people wrote other programs
from which we learned how special things worked. we can't name all of
them so we picked those out, whose programs I could call the 'parents'
of our project:

  isp_hb       from Holger Buss <[e-mail]>
  hex2bin      from Jacques Pelletier <[e-mail]>
  dis51        from David Sullins <[e-mail]>

Also thanks to all unknown developers, who make our little program
possible.

 Have fun
   The Authors