Porting libjpeg to microcontrollers (without OS)

How to porting

• Copy Libs folder to your project
• Add all the source files to the project
• Add include path

Original code

http://www.ijg.org/

jpegsr9c.zip (http://www.ijg.org/files/jpegsr9c.zip)

What was modified

• created jconfig.h based on configuration for mingw
• deleted unnecessary files:
  • sample code
  • source cods for cjpeg, djpeg, jpegtran, rdjpgcom, wrjpgcom
• deleted jmemXXX.c except for jmemansi.c
• modified jmorecfg.h
  • the definition of boolean type, TRUE and FALSE for C++ environment(g++)
  • this is not mandatory if you use gcc
• created dummy_systemcalls.c
  • dummy systen call functions
  • you may be able to use --specs=nosys.specs option if available
  • without this, I got the following error:
    • unlinkr.c:(.text+0x1c): undefined reference to `_unlink'

You may need to modify the following files depending on your system, and performance and memory usage

• dummy_systemcalls.c
• jinclude.h
• jmorecfg.h

Note

I confirmed this code with ZYBO (Zynq, Cortex-A9) in baremetal environment in Xilinx SDK. This code should work for other microcontrollers.