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HTTPPONG
--------
Copyright (c) 2008, 2009 by Wincent Balin
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
* The name of Wincent Balin may not be used to endorse or promote
products derived from this software without specific prior written
permission.
THIS SOFTWARE IS PROVIDED BY Wincent Balin ''AS IS'' AND ANY
EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL Wincent Balin BE LIABLE FOR ANY
DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
This is a very small HTTP server running on a 8051 controller.
The memory (IRAM) usage is 76 bytes, so the program is able to run
without externam RAM. ROM usage is of 2950 bytes, so any 8051 compatible
controller with ROM of 4kb or more may be used. Only the peripherals
every 8051 compatible controller has were used, so the resulting
hex-file should be binary compatible across the whole gross of the
8051 family.
Of the four banks of the 8051 banks 0 and 1 are used; bank 0 is used
for the main program and bank 1 is used for serial communication.
Two bytes in the bit memory are used for, well, the bit memory.
The inspiration and partly a source for this program was found
in the phpstack, PHP TCP/IP stack by Adam Dunkels, and in the miniweb,
the minimal HTTP server, by Adam Dunkels too. The idea how to overcome
SLIP handshake by WinXX OS was found in the application note AN-32
for the Pumpkin RTOS. Initial setup of the UART was taken
from the book "Mikrocomputertechnik" by Bernd-Dieter Schaaf.
The name of the program comes from using a xxxpong.c names for
different stages of TCP/ICMP/IP/SLIP/RS-232 processing, i.e. to see
that the controller sends back an answer, a "pong", to every
TCP connection, the stage was named "tcppong.c". So "httppong"
is the name for the last stage of development.
ICMP protocol (i.e. ping) requests are supported.
The HTTP server is stateless, and the TCP/IP stack does not support
packet fragmentation. That means, that the HTTP request has to fit
into one packet; same goes for the HTTP answer and consequently
for the WWW page which server sends to the HTTP client.
Another peculiarity, attributed both to the need of low memory usage
and to the statelessness of the HTTP server is that the data to be sent
over HTTP is read twice, first time for checksum calculation and
second time for actual transfer.
The function names in the source are pretty self-explanatory.
For example, ip_rx2() means "receive 2 bytes using IP protocol".
The source code was compiled using SDCC 2.8.0 compiler. The result
of the compilation was the file httppong.ihx . Using packihx utility
from the FLIP 3.x programming software was used to rewrite contents
of this file into the file httppong.hex , which can be flashed directly
into the ROM of any 8051 derivate.
The UART of this web server is configured at 2400 baud, 8N1.
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Web server on 8051
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