readme.txt

EVM板JPEG实现,Texas Instruments TMS320C54x EVM JPEG

jpg5xx.bat
Texas Instruments TMS320C54x EVM JPEG
-------------------------------------
Copyright 1996 Texas Instruments Inc.

This directory contains files for an application demonstrating
JPEG compression and decompression on the TI 'C54x EVM. JPG5xx
requires the following to run:
     1. a PC
     2. a C54x EVM mapped to PC I/O address 0x0240
        NOTE: 0x0240 is the default I/O start address.
              See the EVM technical reference to change this setting.
     3. a DOS prompt

JPG5xx can compress GIF files into JFIF files and decompress JFIF files
into PPM files. To run the application, type the following at the DOS
prompt:

for compression:   C:\> jpg5xx -c input.gif output.jpg <Enter>
for decompression: C:\> jpg5xx -d input.jpg output.ppm <Enter>

The output filenames are optional. JPG5xx will append an output extension
to the input file base if an output filename is not supplied. The "-c"
and "-d" parameters denote compression and decompression, respectively.

This application has several limitations, not the least of which is EVM
memory. Although it uses a large memory model for dynamic memory allocation,
the application doesn't make the most efficient use of memory. Therefore,
compression of large GIF files is impossible in the current implementation.

This application is a direct translation of JPEG for the C5x Software
Development System (SWDS), written by Christopher Chang and Mansoor
Chishtie during summer 1993. Their application is a port of Thomas Lane's
JPEG distribution.

See the CSRC and DSRC subdirectories for this application's source files.