MIXED-MODE PROGRAMS
A mixed-mode program is a source file, usually written in C/C++, calling another file written in assembly language. The purpose of having a mixed-mode program is that sometimes, it is easier to implement a routine in assembly language that has faster execution speed and shorter programming code than a similar routine written in C.

Here are some tips on how to assemble, compile, and link mixed-mode programs:

• Assemble the assembly function program with the following command to create an object file. This must be carried out first before compiling or linking the C source file.
  
  
  asm30 funcfilename.asm
  
  
• Compile the source file written in C/C++ with the command
  
  
  cl30 sourcefile.c
  
  
• Create a linker command file that includes the object files created by both the assembler and the compiler as shown below.
  
  

  /* SOURCEFILE.CMD - LINKER COMMAND FILE */
  -c	/* using C convention */
  -stack 0x100	/* 256 words stack */
  sourcefile.obj	/* object file from compiler */
  funcfile.obj	/* object function file from assembler */
  -O sourcefile.out	/* executable output file */
  -l rts30.lib	/*run-time library support*

  
  
• Perform the linking operation with the linker command:
  
  
  lnk30 sourcefile.cmd
  
  
• An output executable file with extension .out will be generated that can be used by both the DSK and the simulator.