Subversion Repositories light8080

Samll-C compiler adapted for embedded systems by Moti Litcochevski.

(February 20, 2012)

This compiler is an adapted version of the C80DOS compiler found on

http://www.cpm.z80.de/small_c.html.

After downloading the compiler I tried to generate some code for my FPGA SOC

using the light8080 CPU. The generated assembler code presented a few issues:

1. The compiler operates in interactive mode requesting the user to enter

   filenames step by step. This is very inconvenient when compiling over and over

   again.

2. The generated assembly code did not compile using my preferred AS80 assembler.

   Although other assemblers are available, they are not free to be used for all

   purposes.

3. The stack pointer was initialized to some constant value.

4. Some coding extras where missing. For example, defining IO ports for CPU

   peripherals (see below).

The compiler version presented here provides some improvements to the above

issues:

1. Main routine was changed to enable command line operation of the compiler.

   For command line options just run the compiler without any input options.

2. Assembly code was changed to the syntax used by the Z80. This enables the

   output assembly file to be compiled using the AS80 tool.

3. Stack pointer initial value may be specified in the command line options.

4. Supporting line comments "//". this is a must for me.

5. Support for hexadecimal values defined with "0x" prefix.

6. Defining IO ports using the following syntax:

      // value in brackets is the port address

      port (128) UDATA;

   Address may be entered as hexadecimal value.

7. Support for global variable init values either as strings or list.

   For example:

      // string init value

      char tstring[10] = "Hello";

      // value list init value

      int tint[10] = {1,2,3,4,5,6,7,8,9,10};

Note that one of the program source file must include the "c80.lib" assembler file

which defines the library assembler functions used by the compiler. Currently all

functions will be added to the output file even if not used. This will increase the

size of the program memory by about 300 bytes.

Features that are missing from the current release:

1. Add "#ifdef" macro statements.

2. Include only the library functions used by the program.

Hope you find this application helpful,

Moti