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Users can use the freeware GCC compiler to create and run code customized for particular applications on the MegaSquirt-II and share them with others (think of things like the Dual Table code and MegaSquirt'nSpark-Extra for MegaSquirt). (Note that the 'standard' code above was created on the commercial Codewarrior compiler - which may be available free, but with some limitations.) To use GCC with Windows to write and compile new code for MegaSquirt-II, we need:

To use Linux, please see the sourceforge MS-II project site.

To get and use these:

  1. Download and install the GCC cross-compiler (it is called this because we are writing a program to be executed on one type of processor - the M68HCS12, but using another type of processor to do the compiling, etc. - probably a Pentium).
    1. Install the Windows port of the compiler from cygwin.org. Use the 'Install cygwin now' icon in the upper right (the link takes you directly to the executable setup program). Follow the directions that come up on the screen (i.e., select 'C:\cygwin' as the install directory, 'Run' the file, etc.). Note that if you already have GCC from a previous install, it may not work with the tools below. Install a fresh version before continuing.
    2. Choose 'Install from Internet' when prompted.
    3. When you are asked which packages to install in the cygwin setup window, go to Devel and select make, and 'Install'. Click on 'default' to change the choice to 'Uninstall' for all the rest of the 'packages'.
    4. The download and installation will download and install files for quite a while, this can be a large download (up to an hour with a cable modem at ~90kb/sec).
    5. When it stops, you will be asked to create icons on the desktop and start menu, 'unclick' the boxes so this doesn't happen (you will run the files from the DevC++ IDE or command line instead).

    Note: If you are using MegaSquirt-II V2 (blue PCB) you will need Phil's latest code, the project files are here: www.megamanual.com/ms2/msii_gcc_v23e.zip

    Assuming you used all the default locations and options, you should have a folder called "C:\cygwin\bin\..." on your hard-drive. There should be a file called 'make.exe' there, as well as a number of other files.

  2. Download and install Steven Carrez's HCS12 toolchain. The file is here:

    gnu-68hc1x-3.0.exe
    .
    Accept the license agreement, and install to the default 'C:\usr' directory. Choose a 'full installation' and any other defaults that come up. You can read more about the m68hc12 development chain at www.gnu-m68hc11.org/. There is also a Yahoo! discussion group here: http://groups.yahoo.com/group/gnu-m68hc11/.

    Assuming you used all the default locations and options, you should have a folder called "C:\usr\bin\..." on your hard-drive. There should be files called 'm6811-elf-gcc.exe', 'm6811-elf-objcopy.exe', and 'm6811-elf-objdump.exe' there, as well as a number of other files.
    You can build the compiler from the source if you prefer. Go to http://stephane.carrez.free.fr/m68hc11_inst_ptc.php and follow the instructions to build Pre-Release 3.0, but replace the file 'gcc/config/udivmodsi4.c' (click the link and 'Save As'). This toolchain is covered under the GNU General Public License.

  3. Edit the code to suit your application and interests. The code is written in the C programming language. You need a text editor to modify the files (the code itself main.c, and the header files flash.h and hcs12.h).While you can use notepad.exe, it won't be very convenient. A useful programming tool is a text editor that highlights the syntax using different colors and has other features specifically designed to make programming easier.

    1. Download Dev C++ 4 from www.bloodshed.net/devcpp.html. The ZIP setup file is here: ftp1.sourceforge.net/dev-cpp/devcpp4.zip
    2. UnZIP the file ('Right-click, Extract to...'),
    3. Open the resulting 'devcpp4' folder, and click on the SETUP.EXE file.
    4. Follow the instructions in the installer, choose the defaults whenever possible. This Dev-C++ should install to the C:\Dev-C++ folder, there should be an executable file called DevCpp.exe in this folder.
    5. Download and run the 'MS-II Tools set-up file'. This installs:
      • Phil Johnson's C source code and Makefile (in C:\MSII\),
      • Eric Fahlgren's downloader (in C:\MSII\),
      • Dev-C++ Tools and default files (in C:\Dev-C++), and
      • sets the PATH via a batch file which is run by the 'Make MS-II .S19 file' tool before it runs the makefile.

      Note that if you have installed the files anywhere other than the default locations, you may have to edit the first few lines of the makefile in the \MSII directory. This applies even if you installed it in a drive other than C:
    6. You can then delete the Dev-C++ installation folders (the original ZIP, and the folder you extracted it to),
    7. Open Dev-C++ by clicking on Dev-C++ under 'Start/All Programs/Dev-C++'. Select the options you want as defaults (this only happens the first time you start Dev-C++),
    8. Open the MegaSquirt-II.dev project in the 'C:\MSII' folder under 'My Computer',
    9. Make the changes you want, generally to the main.c code,
    10. Always save your modified files (called 'units' in Dev-C++) under the same name, main.c, otherwise the Makefile will not recognize your changes. It's a good idea to make back-up copies under other names (ex. main_sept13.c) for reference.

    Note that you can also run the compiler from the command line. Click the link to find out more.

  4. Click on 'Tools/Make MS-II .S19 file' in Dev-C++, this will create the downloadable .S19 file, (DO NOT use the 'Execute/Compile' function, it won't work.)

    Note that the compiler checks to see which files have changed (this is controlled by the makefile), and only compiles the the files that are necessary. If nothing has changed, nothing is done.

  5. Download the modified file to MegaSquirt-II:
    1. Remove the power from MegaSquirt-II, place the bootloader jumper on JP5 (B/LD), and apply power again,
    2. Click on 'Tools/Download .S19 file to MS-II' in Dev-C++, this will open the downloader,
    3. Check the 'Settings', be sure they match your configuration (COM port, baud=115200, etc.),
    4. Open the msii.s19 file in the 'C:\MSII' folder, it will load to MS-II automatically,
    5. Remove power from MegaSquirt-II, remove the boot jumper, then reapply the power and the code should be loaded.

Congratulations, you are now a MegaSquirt-II programmer!

You may also want to have a 'differencing tool'. This will highlight the differences between any two files (C source code, asm, .S19, etc., etc.) and can be very useful for determining what changes have be made, and whether two files are identical. One suitable Windows based differencing tool is WinMerge. The set-up file is WinMerge-2.2.0-Setup.exe, and you can read the documentation for it at http://winmerge.sourceforge.net/. The tools for Dev-C++ above include a link to WinMerge (you can delete that tool in Dev-C++ if you don't use WinMerge).

If you want to co-operate with other programmers in the development of MegaSquirt-II code, visit the sourceforge MS-II project site. Here are instructions on how the CVS (Concurrent Versions System) on Sourceforge works.

MS II Serial Interface Description

MegaSquirt-II uses a baud rate of 115200 to communicate with MegaTune. Communication is established when the MegaTune sends a command character - the particular character sets the mode:

The primary commands for sending and receiving data from MS II via the RS232 serial connection are all constructed using 3 initial bytes as follows:

  1. one-letter command: The possibilities for the one letter command are:

  2. <CANid> - a binary integer single byte from 0-15. Use 0 for MS II, for other (GPIO) devices it is arbitrary depending on how a user has configured the devices in his network. Just set to 0 for communication between the PC and MS-II.

  3. <tble_idx> - a binary integer byte from 0-15 that specifies the block of data from which to get/send data. The variable blocks in MS-II corresponding to <tble_idx> 0-6 (only ones at present) are as follows: