Mega-Micro's - Programming + GCC

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Programming with GCC

Here you will find short example programs designed to help with programming the Mega-68000 and Mega-68030 Computer Systems using GCC.

GCC installation instructions can be found here:

Software/GCC

Getting started

Follow the instructions below to create a very simple executable program that can be downloaded to a Mega-680x0 Computer System and run from RAM using the built-in Monitor program. The source code can be used as a GCC template for writing more complex programs that will run on any Mega-680x0 Computer System. The example presented here simply displays "12340000" shortly followed by "00005678" on the Hex Display Board.

Download the following ZIP file:

gcc_example1

Extract the contents of the ZIP file to a new folder

Remember the name and location of the folder,

this will be referred to as the project folder

Tip: it is convenient to keep the path to the project folder short,

here we will use c:\gcc

Check the contents of the project folder - there should be 3 files:

example1.s	GCC Source File
build.sh	Script File
clean.sh	Script File

Type: cd /mnt/c/gcc

Type: ls

Linux OS will list the 3 files - confirm before continuing

Type: 'dot'+'slash'+'build.sh' i.e. ./build.sh

In the Windows project folder there will now be a an example1.srec file

Open the example1.srec file using Windows Notepad

Copy ALL the text to the Windows Clipboard

10.

Start the Mega-680x0 Computer System

11.

At the SYS> prompt type: LO

12.

Paste the copied text into the Console Window

The Mega-680x0 receives and processes the S-Record formatted binary file,

when reception is complete, the Mega-680x0 will accept the next command

13.

At the SYS> prompt type: G1 or GD 100000 to run the program

Another GCC coding example

Hex Display Board functional test - cycles through 0-F on each digit in turn.

Download the ZIP file: gcc_example2

Script Files

Each GCC example ZIP file contains two Linux Script Files. These scripts are a quick and dirty first attempt at making the command line driven GNU Compiler Collection (GCC) no more difficult to use than the simple Windows based EASy68K IDE (Integrated Development Environment).

./build.sh

This script requires no input from the user whatsoever while invoking the GCC Compiler/Assembler, Linker, and Object Copy tool to generate a Motorola S-Record formatted Mega-680x0 compatible binary file plus a raw binary for good measure.

./clean.sh

This script deletes all files generated by the build.sh script.

IMPORTANT

The V1.0 Script Files are unique to each example, therefore you cannot use the Script Files from example1 with example2 or vice-versa.

Disclaimer

All hardware designs, software, and information shared on this website is provided "as is"

without warranty of any kind and strictly for personal non-commercial use only.

Status: under construction